Manual Sepam 20-1 75gs

PCRED301005EN_1-Couv_2004.FM Page 4 Vendredi, 23. juillet 2004 1:59 13

Electrical network protection

Sepam series 20

’s manual

2004

03146730EN-G0 © 2004 Schneider Electric - All rights reserved

PCRED301005EN_1-Couv_2004.FM Page 3 Vendredi, 23. juillet 2004 1:59 13

Schneider Electric Industries SAS 89, boulevard Franklin Roosevelt F - 92500 Rueil-Malmaison () Tel : +33 (0)1 41 29 85 00 http://www.schneider-electric.com http://www.sepamrelay.merlin-gerin.com

As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication. This document has been printed on ecological paper. Design: Ameg Publication: Schneider Electric Printed:

PCRED301005EN/2 ART.08552

06-2004

PCRED301005EN_0-TDM_2004.FM Page 1 Vendredi, 23. juillet 2004 2:42 14

Contents

Sepam series 20

1

Metering functions

2

Protection functions

3

Control and monitoring functions

4

Modbus communication

5

Installation

6

Use

7

1

PCRED301005EN_0-TDM_2004.FM Page 2 Vendredi, 23. juillet 2004 2:42 14

2

PCRED301005EN_1-intro_2004TDM.fm Page 1 Vendredi, 23. juillet 2004 2:41 14

Sepam series 20

Contents

Presentation

1/2

Selection table

1/3

Electrical characteristics

1/4

Environmental characteristics

1/5

1/1

1

PCRED301005EN_1-intro_2004.FM Page 2 Vendredi, 23. juillet 2004 2:41 14

Sepam series 20

PE50297

The Sepam series 20 family of protection and metering units is designed for the operation of machines and electrical distribution networks of industrial installations and utility substations for all levels of voltage. The Sepam series 20 family consists of simple, high-performing solutions, suited to demanding applications that call for current and voltage metering. Sepam series 20 selection guide by application Selection criteria Series 20 Measurements I Specific protection functions Applications Substation Transformer Motor Busbar

U

U Loss of mains (ROCOF)

B21

B22

S20 T20 M20

Sepam a modular solution.

Main functions

PE50298

Protection b Overcurrent and earth fault protection with adjustable time reset and with switching from on setting group to the other controlled by a logic order. b Earth fault protection insensitivity to transformer switching. b Detection of phase unbalance. b RMS thermal protection which takes into external operating temperature and ventilation operating rates. b Rate of change of frequency protection (ROCOF), for a fast and reliable disconnection. Communication Sepam is totally compatible with the Modbus communication standard. All the data needed for centralized equipment management from a remote monitoring and control system are available via the Modbus communication port: b reading: all measurements, alarms, protection settings,... b writing: breaking device remote control orders,...

Sepam with basic UMI and with fixed advanced UMI.

Diagnosis 3 types of diagnosis data for improved operation: b network and machine diagnosis: tripping current, unbalance ratio, disturbance recording b switchgear diagnosis: cumulative breaking current, operating time b diagnosis of the protection unit and additional modules: continuous self-testing, watchdog. Control and monitoring Circuit breaker program logic ready to use, requiring no auxiliary relays or additional wiring.

Machine Interface 2 levels of Machine Interface (UMI) are available according to the ’s needs: b basic UMI: an economical solution for installations that do not require local operation (run via a remote monitoring and control system) b fixed or remote advanced UMI: a graphic LCD display and 9-key keypad are used to display the measurement and diagnosis values, alarm and operating messages and provide access to protection and parameter setting values, for installations that are operated locally.

PE50299

1

Presentation

Setting and operating software The SFT2841 PC software tool gives access to all the Sepam functions, with all the facilities and convenience provided by a Windows type environment. Example of an SFT2841 software screen.

1/2


Sepam series 20

Functions

Selection table

Type of Sepam Substation

Transformer

Motor

1

Busbar

Protections ANSI code S20 T20 M20 B21 (3) B22 Phase overcurrent (1) 50/51 4 4 4 50N/51N 4 4 4 Earth fault 50G/51G Sensitive earth fault (1) Negative sequence / unbalance 46 1 1 1 Thermal overload 49 RMS 2 2 Phase undercurrent 37 1 Excessive starting time, locked rotor 48/51LR/14 1 Starts per hour 66 1 Positive sequence undervoltage 27D/47 2 2 Remanent undervoltage 27R 1 1 Phase-to-phase undervoltage 27 2 2 Phase-to-neutral undervoltage 27S 1 1 Maximum de tension composée 59 2 2 Phase-to-phase overvoltage 59N 2 2 Underfrequency 81L 2 2 Overfrequency 81H 1 1 Rate of change of frequency 81R 1 Recloser (4 cycles) 79 v Thermostat / Buchholz 26/63 v Temperature monitoring (8 RTDs, 2 set points per sensor) 38/49T v v Metering Phase current I1,I2,I3 RMS, residual current I0 b b b Average current I1, I2, I3, peak demand current IM1,IM2,IM3 b b b Line voltage U21, U32, U13 b b Phase-to-neutral voltage V1, V2, V3 b b Residual voltage V0 b b Positive sequence voltage / rotation direction b b Frequency b b Temperature v v Network and machine diagnosis Tripping current TripI1, TripI2, TripI3, TripI0 b b b Unbalance ratio / negative sequence current Ii b b b Running hours counter / operating time b b Thermal capacity used b b Remaining operating time before b b overload tripping Waiting time after overload tripping b b Starting current and time / overload b Start inhibit time delay, b number of starts before inhibition Disturbance recording b b b b b Switchgear diagnostic Cumulative breaking current b b b Trip circuit supervision v v v v v Number of operations, operating time, charging time v v v Control and monitoring ANSI code Circuit breaker / or control (2) 94/69 v v v v v Latching / acknowledgment 86 b b b b b Logic discrimination (1) 68 v v v Switching of groups of settings (1) b b b Annunciation 30 b b b b b Additional modules MET148-2 module - 8 temperature sensor inputs v v MSA141 module - 1 low level analog output v v v v v MES114 module or MES114E module or MES114F module- (10I/4O) v v v v v ACE949-2 module (2-wire) or ACE959 (4-wire) RS 485 interface or ACE937 v v v v v optical fibre interface b standard, v according to parameter setting and MES114 or MET148-2 input/output module options. (1) 4 relays with the exclusive possibility of logic discrimination or switching from one 2-relay group of settings to another 2-relay group (exclusive choice). (2) For shunt trip unit or undervoltage release coil according to parameter setting. (3) Performs Sepam B20 functions.

1/3


Electrical characteristics

Sepam series 20

Anaputs

1

Current transformer 1 A or 5 A CT (with CCA630) 1 A to 6250 A ratings

input impedance consumption permanent thermal withstand 1 second overload input impedance input voltage permanent thermal withstand 1 second overload

Voltage transformer 220 V to 250 kV ratings

< 0.001 Ω < 0.001 VA at 1 A < 0.025 VA at 5 A 3 In 100 In > 100 kΩ 100 to 230/√3 V 230 V 480 V

Temperature sensor input Type of temperature sensor Isolation from earth Current injected in sensor Maximum distance between sensor and module

Logic inputs Voltage Range Frequency Typical consumption Typical switching threshold Input limit voltage At state 1 At state 2

MES114 24 to 250 V DC 19.2 to 275 V DC 3 mA 14 V DC u 19 V CC y 6 V CC

Pt 100 no 4 mA 1 km

Ni 100 / 120 no 4 mA

MES114E 110 to 125 V DC 88 to 150 V DC 3 mA 82 V DC u 88 V DC y 75 V DC

MES114F 110 V AC 88 to 132 V AC 47 to 63 Hz 3 mA 58 V AC u 88 V AC y 22 V AC

220 to 250 V DC 176 to 275 V DC 3 mA 154 V DC u 176 V DC y 137 V DC

24 / 48 V DC

127 V DC

220 V DC

8A 8/4A 6/2A 4/1A < 15 A for 200 ms

8A 0.7 A 0.5 A 0.2 A

8A 0.3 A 0.2 A 0.1 A

24 / 48 V DC

127 V DC

220 V DC

2A 2/1A

2A 0.5 A

2A 0.15 A

220 to 240 V AC 176 to 264 V AC 47 to 63 Hz 3 mA 120 V AC u 176 V AC y 48 V AC

Control output relays (O1, O2, O11 s) Voltage Continuous current Breaking capacity

DC AC (47.5 to 63 Hz) resistive load L/R load < 20 ms L/R load < 40 ms resistive load load p.f. > 0.3

Making capacity Indication relay outputs (O3, O4, O12, O13, O14 s) Voltage DC AC (47.5 to 63 Hz) Continuous current Breaking L/R load < 20ms capacity load p.f. > 0.3 Power supply range 24 / 250 V DC -20 % +10 % 110 / 240 V AC -20 % +10 % 47.5 to 63 Hz brownout withstand Analog output Current Load impedance Accuracy 1) According to configuration.

1/4

100 to 240 V AC 8A

8A 5A

deactivated cons. (1) 2 to 4,5 W 3 to 9 VA 10 ms 4 - 20 mA, 0 - 20 mA, 0 - 10 mA < 600 Ω (wiring included) 0.50 %

max. cons. (1) 6 to 8 W 9 to 15 VA

100 to 240 V AC 2A 1A inrush current < 10 A for 10 ms < 15 A for first half-period


Environmental characteristics

Sepam series 20

Electromagnetic comptability

IEC / EN standard

Level / Class

EN 55022 / CISPR22 EN 55022 / CISPR22

A B

IEC 60255-22-3 / IEC 61000-4-3 IEC 60255-22-2 / IEC 61000-4-2

III III

10 V/m 8 kV air 6 kV

Immunity tests – Conducted disturbances Immunity to conducted RF disturbances Fast transient bursts 1 MHz damped oscillating wave

IEC 61000-4-6 IEC 60255-22-4 / IEC 61000-4-4 IEC 60255-22-1

III IV III

10 V

Impulse waves Voltage interruptions

IEC 61000-4-5 IEC 60255-11

III

IEC / EN standard

Level / Class

Value

IEC 60255-21-1 IEC 60255-21-2 IEC 60255-21-3

2 2 2

1 Gn 10 Gn / 11 ms

IEC 60255-21-1 IEC 60255-21-2 IEC 60255-21-2

2 (1) 2 (1) 2 (1)

2 Gn 30 Gn / 11 ms 20 Gn / 16 ms

Emission tests Disturbing field emission Conducted disturbance emission Immunity tests – Radiated disturbances Immunity to radiated fields Electrostatic discharge

Mechanical robustness In operation Vibrations Shocks Earthquakes De-energised Vibrations Shocks Jolts

Climatic withstand

Value

1

2.5 kV MC 1 kV MD 100% 10 ms

IEC / EN standard

Level / Class

Value

In operation Exposure to cold Exposure to dry heat Continuous exposure to damp heat Temperature variation with specified variation rate

IEC 60068-2-1 IEC 60068-2-2 IEC 60068-2-3 IEC 60068-2-14

Ab Bb Ca Nb

-25°C +70°C 10 days; 93 % HR; 40°C –25 °C à +70 °C 5°C/min

Salt mist Influence of corrosion

IEC 60068-2-52 IEC 60068-2-60

Kb / 2

In storage (4) Exposure to cold Exposure to dry heat Continuous exposure to damp heat

IEC 60068-2-1 IEC 60068-2-2 IEC 60068-2-3

Ab Bb Ca

-25 °C +70 °C 56 days; 93 % RH; 40 °C

IEC / EN standard

Level / Class

Value

IEC 60529

IP52

Other s closed, except for rear IP20

NEMA

Type 12 with gasket supplied

Safety Enclosure safety tests Front tightness

Fire withstand Electrical safety tests Earth continuity 1.2/50 µs impulse wave Power frequency dielectric withstand

21 days ; 75 % HR ; 25 °C ; 0,5 ppm H2S , 1 ppm S02

IEC 60695-2-11

650°C with glow wire

IEC 61131-2 IEC 60255-5 IEC 60255-5

30 A 5 kV (2) 2 kV 1 mn (3)

Certification CE

generic standard EN 50263

UL UL508 - CSA C22.2 n° 14-95 CSA CSA C22.2 n° 94-M91 / n° 0.17-00 (1) Results given for intrinsic withstand, excluding equipment. (2) Except for communication: 3 kV in common mode and 1 kV in differential mode. (3) Except for communication: 1 kVrms. (4) Sepam must be stored in its original packing.

European directives: b 89/336/EEC Electromagnétic Compatibility (EMC) Directive v 92/31/EEC Amendment v 92/68/EEC Amendment b 73/23/EEC Low Voltage Directive v 93/68/EEC Amendment File E212533 File E210625

1/5


1

1/6

PCRED301005EN_2-Metering_2004TDM.fm Page 1 Vendredi, 23. juillet 2004 2:42 14

Metering functions

Contents

Characteristics

2/2

Phase current Residual current

2/3

Average current and peak demand currents

2/4

Phase-to-phase voltage Phase to neutral voltage

2/5

Residual voltage Positive sequence voltage

2/6

Frequency Temperature

2/7

Tripping current Negative sequence / unbalance

2/8

Disturbance recording

2/9

Running hours counter and operating time Thermal capacity used

2/10

Operating time before tripping Waiting time after tripping

2/11

Starting current and starting / overload time

2/12

Number of starts before inhibition Start inhibit time delay

2/13

Cumulative breaking current and number of operations

2/14

Operating time Charging time

2/15

2/1

2

PCRED301005EN_2-Metering_2004.FM Page 2 Vendredi, 23. juillet 2004 2:43 14

Metering functions

Characteristics

General settings Rated phase current In (sensor primary current)

Selection 2 or 3 x 1 A / 5 A CTs 3 LPCT sensors

Basic current Ib Residual current In0

2

Rated primary phase-to-phase voltage Unp (Vnp: Rated primary phase-to-neutral voltage: Vnp = Unp/3) Rated secondary phase-to-phase voltage Uns

sum of 3 phase currents CSH120 or CSH200 core balance CT 1 A / 5 A CT + CSH30 interposing ring CT core balance CT + ACE990 (the core bal. CT ratio 1/n should be such that: 50 y n y 1500)

3 VTs: V1, V2, V3 2 VTs: U21, U32 1 VT: U21

Frequency Metering functions Phase current

Range 0.1 to 1.5 In

Residual current

0.1 to 1.5 In0

Average current and peak demand phase current

0.1 to 1.5 In

Phase-to-phase or phase-to-neutral voltage Residual voltage

0.05 to 1.2 Unp 0.05 to 1.2 Vnp 0.015 to 3 Vnp

Positive sequence voltage Frequency Temperature

0.05 to 1.2 Vnp 50 ±5 Hz or 60 ±5 Hz -30 °C to +200 °C or -22 °F to 392 °F

Range 1 A to 6250 A 25 A to 3150 A (1) 0.4 to 1.3 In see rated phase current In 2 A rating or 20 A rating 1 A to 6250 A (CT primary) according to current to be monitored and use of ACE990 220 V to 250 kV 100, 110, 115, 120, 200, 230 V 100, 110, 115, 120 V 100, 110, 115, 120 V 50 Hz or 60 Hz Accuracy (2) ±1 % typical ±2 % from 0.3 to 1.5 In ±5 % if < 0.3 In ±1 % typical ±2 % from 0.3 to 1.5 In0 ±5 % if < 0.3 In0 ±1 % typical ±2 % from 0.3 to 1.5 In ±5 % if < 0.3 In ±1 % from 0.5 to 1.2 Unp or Vnp ±2 % from 0.05 to 0.5 Unp or Vnp ±1 % from 0.5 to 3 Vnp ±2 % from 0.05 to 0.5 Vnp ±5 % from 0.015 to 0.05 Vnp ±5 % at Vnp ±0.05 Hz ±1 °C from +20 to +140 °C ±2 °C

Network diagnosis assistance functions Phase tripping current 0.1 to 40 In ±5 % Earth fault tripping current 0.1 to 20 In0 ±5 % Unbalance / negative sequence current li 10 % to 500 % Ib ±2 % Machine operation assistance functions Running hours counter / operating time 0 to 65535 hours ±1 % or ±0.5 h Thermal capacity used 0 to 800 % (100 % for phase I = Ib) ±1 % Remaining operating time before overload tripping 0 to 999 mn ±1 mn Waiting time after overload tripping 0 to 999 mn ±1 mn Starting current 1.2 Ib to 24 In ±5 % Starting time 0 to 300 s ±10 ms Start inhibit time delay 0 to 360 mn ±1 mn Number of starts before inhibition 0 to 60 1 Switchgear diagnosis assistance functions Cumulative breaking current 0 to 65535 kA2 ±10 % Number of operations 0 to 65535 1 Operating time 20 to 100 ms ±1 ms Charging time 1 to 20 s ±0.5 s (1) Table of In values in Amps: 25, 50, 100, 125, 133, 200, 250, 320, 400, 500, 630, 666, 1000, 1600, 2000, 3150. (2) In reference conditions (IEC 60255-6), typical at In or Un.

2/2


Metering functions

Phase current Residual current

Phase current Operation This function gives the RMS value of the phase currents: b I1: phase 1 current b I2: phase 2 current b I3: phase 3 current. It is based on RMS current measurement and takes into harmonics up to number 17.

2

Readout The measurements may be accessed via: b the display of a Sepam with advanced UMI by pressing the b the display of a PC with the SFT2841 software b the communication link b an analog converter with the MSA141 option.

key

Characteristics Measurement range Unit Accuracy

Display format (3) Resolution Refresh interval (1) In rated current set in the general settings. (2) At In, in reference conditions (IEC 60255-6). (3) Display of values: 0.2 to 40 In.

0.1 to 1.5 In (1) A or kA typically ±1 % (2) ±2 % from 0.3 to 1.5 In ±5 % if < 0.3 In 3 significant digits 0.1 A or 1 digit 1 second (typical)

Residual current Operation This operation gives the RMS value of the residual current I0. It is based on measurement of the fundamental component.


key

Characteristics Measurement range Connection to 3 phase CT: Connection to 1 CT with CSH30 interposing ring CT Connection to core balance CT with ACE990 Connection to CSH residual 2 A rating current sensor 20 A rating Unit Accuracy (2)

0.1 to 1.5 In0 (1) 0.1 to 1.5 In0 (1) 0.1 to 1.5 In0 (1) 0.2 to 3 A 2 to 30 A A or kA typically ±1 % at In0 ±2 % from 0.3 to 1.5 In0 ±5 % if < 0.3 In0 3 significant digits 0.1 A or 1 digit

Display format Resolution (1) In0 rated current set in the general settings. (2) in reference conditions (IEC 60255-6), excluding sensor accuracy.

2/3


Metering functions

Average current and peak demand currents

Operation This function gives: b the average RMS current for each phase that has been obtained for each integration interval b the greatest average RMS current value for each phase that has been obtained since the last reset. The values are refreshed after each "integration interval", an interval that may be set from 5 to 60 mn.

Readout

2

The measurements may be accessed via: b the display of a Sepam with advanced UMI by pressing the b the display of a PC with the SFT2841 software b the communication link.

key

Resetting to zero: b press the clear key on the display when a peak demand current is displayed b via the clear command in the SFT2841 software b via the communication link (remote control order TC6).


Display format Resolution Integration interval (1) In rated current set in the general settings. (2) at In, in reference conditions (IEC 60255-6).

2/4

0.1 to 1.5 In (1) A or kA typically ±1 % (2) ±2 % from 0.3 to 1.5 In ±5 % if < 0.3 In 3 significant digits 0.1 A or 1 digit 5, 10, 15, 30, 60 minutes


Metering functions

Phase-to-phase voltage Phase to neutral voltage

Phase-to-phase voltage Operation This function gives the RMS value of the 50 or 60 Hz component of phase-to-phase voltages (according to voltage sensor connections): b U21: voltage between phases 2 and 1 b U32: voltage between phases 3 and 2 b U13: voltage between phases 1 and 3. It is based on measurement of the fundamental component.

2


key

Characteristics Measurement range Unit Accuracy (2) Display format Resolution Refresh interval (1) Un nominal rating set in the general settings. (2) at Un, in reference conditions (IEC 60255-6).

0.05 to 1.2 Unp (1) V or kV ±1 % from 0.5 to 1.2 Unp ±2 % from 0,05 to 0.5 Unp 3 significant digits 1 V or 1 digit 1 second (typical)

Phase-to-neutral voltage Operation This function gives the RMS value of the 50 or 60 Hz component of phase-to-neutral voltages: b V1: phase 1 phase-to-neutral voltage b V2: phase 2 phase-to-neutral voltage b V3: phase 3 phase-to-neutral voltage. It is based on measurement of the fundamental component.


key

Characteristics Measurement range Unit Accuracy (2) Display format Resolution Refresh interval (1) Vnp: primary rated phase-to-neutral voltage (Vnp = Unp/3). (2) at Vnp in reference conditions (IEC 60255-6).

0.05 to 1.2 Vnp (1) V or kV ±1 % from 0.5 to 1.2 Vnp ±2 % from 0.05 to 0.5 Vnp 3 significant digits 1 V or 1 digit 1 second (typical)

2/5


Metering functions

Residual voltage Positive sequence voltage

Residual voltage Operation This function gives the value of the residual voltage V0 = (V1 + V2 + V3). V0 is measured: b by taking the internal sum of the 3 phase voltages b by an open star / delta VT. It is based on measurement of the fundamental component.

Readout

2

The measurement may be accessed via: b the display of a Sepam with advanced UMI by pressing the b the display of a PC with the SFT2841 software b the communication link.

key


Display format Resolution Refresh interval (1) Vnp: primary rated phase-to-neutral voltage (Vnp = Unp/3).

0.015 Vnp to 3 Vnp (1) V or kV ±1 % from 0.5 to 3 Vnp ±2 % from 0.05 to 0.5 Vnp ±5 % from 0.015 to 0.05 Vnp 3 significant digits 1 V or 1 digit 1 second (typical)

Positive sequence voltage Operation This function gives the calculated value of the positive sequence voltage Vd.

Readout The measurement may be accessed via: b the display of a Sepam with advanced UMI by pressing the b the display of a PC with the SFT2841 software b the communication link.

key

Characteristics Measurement range Unit Accuracy Display format Resolution Refresh interval (1) Vnp: primary rated phase-to-neutral voltage (Vnp = Unp/3).

2/6

0.05 to 1.2 Vnp (1) V or kV ±2 % at Vnp 3 significant digits 1 V or 1 digit 1 second (typical)


Metering functions

Frequency Temperature

Frequency Operation This function gives the frequency value. Frequency is measured via the following: b based on U21, if only one phase-to-phase voltage is connected to the Sepam b based on positive sequence voltage, if the Sepam includes U21 and U32 measurements. Frequency is not measured if: b the voltage U21 or positive sequence voltage Vd is less than 40 % of Un b the frequency is outside the measurement range.

Readout The measurement may be accessed via: b the display of a Sepam with advanced UMI by pressing the b the display of a PC with the SFT2841 software b the communication link b an analog converter with the MSA141 option.

key

Characteristics Rated frequency Range

50 Hz 60 Hz

Accuracy (1) Display format Resolution Refresh interval (1) At Un in reference conditions (IEC 60255-6).

50 Hz, 60 Hz 45 Hz to 55 Hz 55 Hz to 65 Hz ±0.05 Hz 3 significant digits 0.01 Hz or 1 digit 1 second (typical)

Temperature Operation This function gives the temperature value measured by resistance temperature detectors (RTDs): b platinum Pt100 (100 Ω at 0 °C) in accordance with the IEC 60751 and DIN 43760 standards b nickel 100 Ω or 120 Ω (at 0 °C). Each RTD channel gives one measurement: b tx = RTD x temperature. The function also indicates RTD faults: b RTD disconnected (tx > 205 °C) b RTD shorted (tx < -35 °C). In the event of a fault, display of the value is inhibited. The associated monitoring function generates a maintenance alarm.

Readout The measurement may be accessed via: b the display of a Sepam with advanced UMI by pressing the b the display of a PC with the SFT2841 software b the communication link b an analog converter with the MSA141 option.

key

Characteristics Range

Resolution

-30 °C to +200 °C or -22 °F to +392 °F ±2 °C ±1 °C from +20 to +140 °C 1 °C or 1 °F

Refresh interval

5 seconds (typical)

Accuracy (1)

(1) At Un in reference conditions (IEC 60255-6).

Accuracy derating according to wiring : see chapter "installation of MET148-2 module" page 6/22.

2/7

2


Tripping current Negative sequence / unbalance

Network diagnosis functions

Tripping current

TRIP 1

MT10252

I

Operation This function gives the RMS value of currents at the prospective time of the last trip: b TRIP1: phase 1 current b TRIP2: phase 2 current b TRIP3: phase 3 current b TRIPI0: residual current. It is based on measurement of the fundamental component. This measurement is defined as the maximum RMS value measured during a 30 ms interval after the activation of the tripping on output O1.

tripping order

2

30 ms T0

t

Readout The measurements may be accessed via: b the display of a Sepam with advanced UMI by pressing the b the display of a PC with the SFT2841 software b the communication link.

key

Characteristics Measurement range Residual current Unit Accuracy Display format Resolution (1) In/In0 rated current set in the general settings.

phase current 0.1 to 40 In (1) 0.1 to 20 In0 (1) A or kA ±5 % ±1 digit 3 significant digits 0.1 A or 1 digit

Negative sequence / unbalance Operation This function gives the negative sequence component: T = Ii/Ib The negative sequence current is determined based on the phase currents: b 3 phases 1 2 Ii = --- × ( I1 + a I2 + aI3 ) 3 2π j ------3

with a = e b 2 phases

1 Ii = ------- × I1 – a 2 I3 3 2π j ------3

with a = e These 2 formulas are equivalent when there is no earth fault.


key

Characteristics Measurement range Unit Accuracy Display format Resolution Refresh interval

2/8

10 to 500 % Ib ±2 % 3 significant digits 1% 1 second (typical)


Disturbance recording

Network diagnosis functions

Operation This function is used to record analog signal and logical states. Record storage is activated according to parameter setting by a triggering event (see Control and monitoring functions - Disturbance recording triggering). The stored event begins before the triggering event and continues afterwards. The record comprises the following information: b values sampled from the different signals b date b characteristics of the recorded channels. The files are recorded in FIFO (First In First Out) type shift storage: the oldest record is erased when a new record is triggered. Transfer Files may be transferred locally or remotely: b locally: using a PC which is connected to the pocket terminal connector and has the SFT2841 software tool b remotely: using a software tool specific to the remote monitoring and control system. Recovery The signals are recovered from a record by means of the SFT2826 software tool.

Principle MT10181

stored record time triggering event (1)

Characteristics x periods before the triggering event (1) total 86 periods Record content Set-up file: date, channel characteristics, measuring transformer ratio Sample file: 12 values per period/recorded signal Analog signals recorded (2) 4 current channels (I1, I2, I3, I0) or 4 voltage channels (V1, V2, V3) Logical signals 10 digital inputs, outputs O1, pick-up Number of stored records 2 File format COMTRADE 97 (1) According to parameter setting with the SFT2841 (default setting 36 cycles). (2) According to sensor type and connection. Record duration

2/9

2


Machine operation assistance functions

Running hours counter and operating time Thermal capacity used Running hours counter / operating time The counter gives the running total of time during which the protected device (motor or transformer) has been operating (I > 0.1Ib). The initial counter value may be modified using the SFT2841 software. The counter is saved every 4 hours.


2

key

Characteristics Range Unit

0 to 65535 hours

Thermal capacity used Operation The thermal capacity used is calculated by the thermal protection function. The thermal capacity used is related to the load. The thermal capacity used measurement is given as a percentage of the rated thermal capacity.

Saving of thermal capacity used When the protection unit trips, the current thermal capacity used increased by 10 % (1) is saved. The saved value is reset to 0 when the thermal capacity used has decreased sufficiently for the start inhibit time delay to be zero. The saved value is used again after a Sepam power outage, making it possible to start over with the temperature buildup that caused the trip. (1) The 10 % increase is used to take into the average temperature buildup of motors when starting.


key

Characteristics

2/10

Measurement range

0 to 800 %

Unit

%

Display format

3 significant digits

Resolution

1%

Refresh interval

1 second (typical)



Operating time before tripping Waiting time after tripping

Remaining operating time before overload tripping Operation The time is calculated by the thermal protection function. It depends on the thermal capacity used.


2

key

Characteristics Measurement range

0 to 999 mn

Unit

mn

Display format


Resolution

1 mn

Refresh interval

1 second (typical)

Waiting time after overload tripping Operation The time is calculated by the thermal protection function. It depends on the thermal capacity used.


key


0 to 999 mn

Unit

mn

Display format


Resolution

1 mn

Refresh period

1 second (typical)

2/11



Starting current and starting / overload time

Operation The starting / overload time is the time between the moment at which one of the 3 phase currents exceeds 1.2 Ib and the moment at which the 3 currents drop back below 1.2 Ib. The maximum phase current obtained during this period is the starting / overload current. The 2 values are saved in the event of an auxiliary power failure.

Readout

2

The measurements may be accessed via: b the display of a Sepam with advanced UMI by pressing the b the display of a PC with the SFT2841 software b the communication link.

key

Characteristics Starting / overload time Measurement range

0 to 300 s

Unit

s or ms

Display format


Resolution

10 ms or 1 digit

Refresh interval

1 second (typical)

Starting / overload current Measurement range

1.2 Ib to 24 In (1)

Unit

A or kA

Display format


Resolution

0.1 A or 1 digit

Refresh interval

1 second (typical)

(1) Or 65.5 kA.

2/12



Number of starts before inhibition Start inhibit time delay

Number of starts before inhibition Operation The number of starts allowed before inhbition is calculated by the number of starts protection function. The number of starts depends on the thermal state of the motor.


2

key

Resetting to zero The number of starts counters may be reset to zero as follows, after the entry of a : b on the advanced UMI display unit by pressing the "clear" key b on the display of a PC with the SFT2841 software.


0 to 60

Unit

none

Display format


Resolution

1

Refresh interval

1 second (typical)

Start inhibit time delay Operation The time delay is calculated by the number of starts protection function. If the number of starts protection function indicates that starting is inhibited, the time given represents the waiting time before starting is allowed.

Readout The number of starts and waiting time may be accessed via: b the display of a Sepam with advanced UMI by pressing the b the display of a PC with the SFT2841 software b the communication link.

key


0 to 360 mn

Unit

mn

Display format


Resolution

1 mn

Refresh interval

1 second (typical)

2/13


Switchgear diagnosis functions

Cumulative breaking current and number of operations

Cumulative breaking current Operation This function indicates the cumulative breaking current in square kiloamperes (kA)2 for five current ranges. It is based on measurement of the fundamental component. The current ranges displayed are: b 0 < I < 2 In b 2 In < I < 5 In b 5 In < I < 10 In b 10 In < I < 40 In b I > 40 In. The function also provides the total number of operations and the cumulative total of breaking current in (kA)². Refer to switchgear documentation for use of this information.

2

Number of operation The function is activated by tripping commands (O1 relay). Each value is saved in the event of a power failure.

Readout The measurements may be accessed via: b the display of a Sepam with advanced UMI by pressing the key b the display of a PC with the SFT2841 software b the communication link. The initial values may be introduced using the SFT2841 software tool to take into the real state of a used breaking device.

Characteristics Breaking current (kA)2 Range Unit Accuracy (1) Number of operations Range (1) At In, in reference conditions (IEC 60255-6).

2/14

0 to 65535 (kA)2 primary (kA)2 ±10 % 0 to 65535



Operating time Charging time

Operating time Operation This function gives the value of the opening operating time of a breaking device (1) and change of status of the device open position connected to the I11 input (2). The function is inhibited when the input is set for AC voltage (3). The value is saved in the event of a power failure.


2

key

(1) Refer to switchgear documentation for use of this information. (2) Optional MES module. (3) Optional MES114E or MES114F modules.

Characteristics Measurement range Unit Accuracy Display format

20 to 100 ms typically ±1 ms 3 significant digits

Charging time Operation This function gives the value of the breaking device (1) operating mechanism charging time, determined according to the device closed position status change and the end of charging connected to the Sepam I12 and I24 (2). The value is saved in the event of a power failure.


key

(1) Refer to switchgear documentation for use of this information. (2) Optional MES114 or MES114E or MES114F modules.

Characteristics Measurement range Unit Accuracy Display format

1 to 20 s ±0.5 sec 3 significant digits

2/15



2

2/16

PCRED301005EN_3-Protection_2004TDM.fm Page 1 Vendredi, 23. juillet 2004 2:44 14


Contents

Setting ranges

3/2

Phase-to-phase undervoltage ANSI code 27

3/4

Positive sequence undervoltage and phase rotation direction check ANSI code 27D/47

3/5

Remanent undervoltage ANSI code 27R

3/6

Phase-to-neutral undervoltage ANSI code 27S

3/7

Phase undercurrent ANSI code 37

3/8

Temperature monitoring ANSI code 38/49T

3/ 9

Negative sequence / unbalance ANSI code 46

3/10

Excessive starting time, locked rotor ANSI code 48/51LR/14

3/12

Thermal overload ANSI code 49RMS

3/13

Phase overcurrent ANSI code 50/51

3/22

Earth fault ANSI code 50N/51N or 50G/51G

3/24

Phase-to-phase overvoltage ANSI code 59

3/26

Neutral voltage displacement ANSI code 59N

3/27

Starts per hour ANSI code 66

3/28

Recloser ANSI code 79

3/29

Overfrequency ANSI code 81H

3/31

Underfrequency ANSI code 81L

3/32

Rate of change of frequency ANSI code 81R

3/33

General IDMT protection functions

3/34

3/1

3

PCRED301005EN_3-Protection_2004.FM Page 2 Vendredi, 23. juillet 2004 2:45 14


General settings Rated phase current In (sensor primary current)

Setting ranges

Selection

Range

2 or 3 x 1 A / 5 A CTs

1 A to 6250 A

25 A to 3150 A (2) 0.4 to 1.3 In sum of 3 phase currents see rated phase current In CSH120 or CSH200 core balance CT 2 A rating or 20 A rating 1 A / 5 A CT + CSH30 interposing ring CT 1 A to 6250 A (CT primary) core balance CT + ACE990 (the core bal. CT according to current to be monitored and use of ACE990 ratio 1/n should be such that: 50 y n y 1500) 220 V to 250 kV 3 LPCT sensors

Basic current Ib Residual current In0

3

Rated primary phase-to-phase voltage Unp (Vnp: Rated primary phase-to-neutral voltage: Vnp = Unp/3) Rated secondary phase-to-phase voltage Uns 3 VTs: V1, V2, V3 2 VTs: U21, U32 1 VT: U21 Frequency

Functions

100, 110, 115, 120, 200, 230 V 100, 110, 115, 120 V 100, 110, 115, 120 V 50 Hz or 60 Hz

Settings

Time delays

ANSI 27 - Phase-to-phase undervoltage 5 to 100 % of Unp ANSI 27D/47 - Positive sequence undervoltage 30 to 100 % of Vnp (Unp/3) ANSI 27R - Remanent undervoltage 5 to 100 % of Unp ANSI 27S - Phase-to-neutral undervoltage 5 to 100 % of Vnp ANSI 37 - Phase undercurrent

0.05 s to 300 s 0.05 s to 300 s 0.05 s to 300 s 0.05 s to 300 s

0.15 to 1 Ib

0.05 s to 300 s

ANSI 38/49T - Temperature (RTDs) 0 to 180 °C (or 32 to 356 °F) ANSI 46 - Negative sequence / unbalance Definite time 0.1 to 5 Ib IDMT 0.1 to 0.5 Ib (Schneider Electric) 0.1 to 1Ib (IEC, IEEE) ANSI 48/51LR/14 - Excessive starting time/locked rotor 0.5 Ib to 5 Ib ANSI 49RMS - Thermal overload Negative sequence coefficient Time constant

0.1 s to 300 s 0.1 s to 1 s

ST start time LT and LTS time delay

Alarm and trip set points

0 - 2.25 - 4.5 - 9 Heat rise Cooling 50 to 300 % of normal heat rise

Cold curve modification coefficient Operating rate change condition

0 to 100 % By Is set point adjustable from 0.25 to 8 Ib (motor)

Operating rate 1

0.5 s to 300 s 0.05 s to 300 s Operating rate 2

T1: 5 to 120 mn T2: 5 to 600 mn

T1: 5 to 120 mn T2: 5 to 600 mn

By logic input I26 (transformer) Maximum equipment temperature ANSI 50/51 - Phase overcurrent Tripping curve

Is set point Timer hold delay

3/2

60 to 200 °C

Definite time SIT, LTI, VIT, EIT, UIT (1) RI IEC: SIT/A, LTI/B, VIT/B, EIT/C IEEE: MI (D), VI (E), EI (F) IAC: I, VI, EI 0.1 to 24 In 0.1 to 2.4 In Definite time (DT; timer hold) IDMT (IDMT; reset time)

Timer hold delay DT DT DT DT or IDMT DT or IDMT DT or IDMT Definite time IDMT

Inst. 0.05 s to 300 s 0.1 s to 12.5 s at 10 Is Inst. 0.05 s to 300 s 0.5 s to 20 s



Functions

Setting ranges

Settings

ANSI 50N/51N or 50G/51G - Earth fault Tripping curve

Is0 set point Timer hold delay

Definite time SIT, LTI, VIT, EIT, UIT (1) RI IEC: SIT/A,LTI/B, VIT/B, EIT/C IEEE: MI (D), VI (E), EI (F) IAC: I, VI, EI 0.1 to 15 In0 0.1 to 1 In0 Definite time (DT; timer hold) IDMT (IDMT; reset time)

Time delays Time hold delay DT DT DT DT or IDMT DT or IDMT DT or IDMT Definite time IDMT

Inst. 0.05 s to 300 s 0.1 s to 12.5 s at 10 Is0 Inst. 0.05 s to 300 s 0.5 s to 300 s

ANSI 59 - Phase-to-phase overvoltage 50 to 150 % of Unp

0.05 s to 300 s

2 to 80 % of Unp

0.05 s to 300 s

ANSI 59N - Neutral voltage displacement

3

ANSI 66 - Starts per hour 1 to 60 per hour 1 to 60 consecutive

hour time between starts

1 to 6 h 0 to 90 mn

ANSI 81H - Overfrequency ANSI 81L - Underfrequency Set point 1 and set point 2 ANSI 81R - Rate of change of frequency

50 to 53 Hz or 60 to 63 Hz

0.1 s to 300 s

45 to 50 Hz or 55 to 60 Hz

0.1 s to 300 s

0.1 to 10 Hz/s Reminder: In current, Unp rated voltage and In0 current are general settings that are made at the time of Sepam commissioning. They are given as the values on the measurement transformer primary windings. The current, voltage and frequency values are set by direct entry of the values (resolution: 1 A, 1 V, 0.1 Hz, 1 °C or F). (1) Tripping as of 1.2 Is. (2) Table of In values in Amps: 25, 50, 100, 125, 133, 200, 250, 320, 400, 500, 630, 666, 1000, 1600, 2000, 3150.

Inst. 0.15 s to 300 s

3/3


Phase-to-phase undervoltage ANSI code 27


Operation The protection function is three-phase: b it picks up if one of the 3 phase-to-phase voltages drops below the Us set point b it includes a definite time delay T.

MT10873

Block diagram U21 U32

U < Us

T

0

U13

time-delayed output “pick-up” signal

Characteristics Us set point

3

Setting

5 % Unp to 100 % Unp

Accuracy (1)

±2 % or 0.005 Unp

Resolution

1%

Drop-out/pick-up ratio

103 % ±2.5 %

Time delay T Setting

50 ms to 300 s

Accuracy (1)

±2 %, or ±25 ms

Resolution

10 ms or 1 digit

Characteristic times Operation time

pick-up < 35 ms (typically 25 ms)

Overshoot time

< 35 ms

Reset time

< 40 ms

(1) In reference conditions (IEC 60255-6).

3/4


Positive sequence undervoltage and phase rotation direction check ANSI code 27D/47


Operation Positive sequence undervoltage The protection picks up when the positive sequence component Vd of a three-phase voltage system drops below the Vsd set point with 1 Vd = --- ( V1 + V2 + a 2 V3 ) 3 1 Vd = --- ( U21 – a 2 U32 ) 3 U with V = ------- and a = e 3

2π j ------3

b it includes a definite time delay T b it allows drops in motor electrical torque to be detected. Phase rotation direction This protection also allows the phase rotation direction to be detected. The protection considers that the phase rotation direction is inverse when the positive sequence voltage is less than 10 % of Unp and when the phase-to-phase voltage is greater than 80 % of Unp.

MT10872

Block diagram Vd

Vd < Vsd

T

0

time-delayed output

“pick-up” signal Vd < 0.1Un

U21 (or V1)

U > 0.8 Un

&

rotation display

(2)

Characteristics Vsd set point Setting 15 % Unp to 60 % Unp Accuracy (1) ±2 % Pick-up/drop-out ratio 103 % ±2,5 % Resolution 1% Time delay Setting 50 ms to 300 s ±2 %, or ±25 ms Accuracy (1) Resolution 10 ms or 1 digit Characteristics times Operating time pick-up < 55 ms Overshoot time < 35 ms Reset time < 35 ms (1) In reference conditions (IEC 60255-6). (2) Displays "rotation" instead of positive sequence voltage measurement.

3/5

3


Remanent undervoltage ANSI code 27R


Operation This protection is single-phase: b it picks up when the U21 phase-to-phase voltage is less than the Us set point b the protection includes a definite time delay.

MT10875

Block diagram U21 (or V1)

U < Us

T

0

time-delayed output “pick-up” signal

Characteristics Us set point

3

Setting

5 % Unp to 100 % Unp

Accuracy (1)

±2 % or 0.005 Unp

Resolution

1%


103 % ±2.5 %


50 ms to 300 s

Accuracy (1)

±2 %, or ±25 ms

Resolution

10 ms or 1 digit


< 40 ms

Overshoot time

< 20 ms

Reset time

< 30 ms


3/6


Phase-to-neutral undervoltage ANSI code 27S


Operation This protection is three-phase: b it picks up when one of the 3 phase-to-neutral voltages drops below the Vs set point b it has 3 independent outputs available for the control matrix b it is operational if the number of VTs connected is V1, V2, V3 or U21, U32 with measurement of V0.

MT10874

Block diagram V1

V1 < Vs

V2

V2 < Vs

V3

V3 < Vs

T

0

T

0

T

0

1

time-delayed output

time-delayed output

time-delayed output

“pick-up” signal

Characteristics Vs set point Setting

5 % Vnp to 100 % Vnp

Accuracy (1)

±2 % or 0.005 Vnp

Resolution

1%


103 % ±2.5 %


50 ms to 300 s

Accuracy (1)

±2 %, or ±25 ms

Resolution

10 ms or 1 digit



Overshoot time

< 35 ms

Reset time

< 40 ms


3/7

3


Phase undercurrent ANSI code 37

Operation

Block diagram

This protection is single-phase: b it picks up when phase 1 current drops below the Is set point b it is inactive when the current is less than 10 % of Ib b it is insensitive to current drops (breaking) due to circuit breaker tripping b it includes a definite time delay T.

MT10426

Is

I

MT10865

Operating principle

0.1 Ib “pick-up” signal time-delayed output Case of current sag.

MT10866

15 ms 0 &

T

0

time-delayed output” “pick-up” signal

I> 0.1 Ib

Operating time Overshoot time Reset time (1) In reference conditions (IEC 60255-6).

1.06 Is Is

1.06 Is Is 0.1 Ib “pick-up” signal = 0 time-delayed output = 0 Case of circuit breaker tripping.

3/8

I < Is

Is set point Setting Accuracy (1) Pick-up/drop-out ratio T time delay Setting Accuracy (1) Resolution Characteristic times

T

0 0,1 Ib

I1

Characteristics

t

3

DE50367


<15 ms

15 % Ib y Is y 100 % Ib by steps of 1 % ±5 % 106 % ±5 % for Is > 0.1 In 50 ms y T y 300 s ±2 % or ±25 ms 10 ms or 1 digit < 50 ms < 35 ms < 40 ms


Temperature monitoring ANSI code 38/49T


Operation This protection is associated with an RTD of the Pt100 platinum (100 Ω at 0 °C) or (nickel 100 Ω, nickel 120 Ω) type in accordance with the IEC 60751 and DIN 43760 standards. b it picks up when the monitored temperature is greater than the Ts set point b it has two independent set points: v alarm set point v tripping set point b when the protection is activated, it detects whether the RTD is shorted or disconnected: v RTD shorting is detected if the measured temperature is less than -35 °C (measurement displayed “****”) v RTD disconnection is detected if the measured temperature is greater than +205 °C (measurement displayed “-****”). If an RTD fault is detected, the set point output relays are inhibited: the protection outputs are set to zero. The "RTD fault" item is also made available in the control matrix and an alarm message is generated.

Block diagram MT10878

T < +205 ˚C

&

RTD

T > -35 ˚C

&

T > Ts1

set point 1

T > Ts2

set point 2

RTD’s fault

Characteristics Ts1 and Ts2 set points °C °F Setting 0 °C to 180 °C 32 °F to 356 °F ±1.5 °C ±2.7 °F Accuracy (1) Resolution 1 °C 1 °F Pick-up/drop-out difference 3 °C ±0.5 ° Characteristic times Operation time < 5 seconds (1) See "connection of MET148-2 module" chapter for accuracy derating according to wiring cross-section.

3/9

3




Operation

The tripping curve is defined according to the following equations: b for Is/Ib y Ii/Ib y 0,.

The negative sequence / unbalance protection function: b picks up if the negative sequence component of phase currents is greater than the operation set point b it is time-delayed. The time delay may be definite time or IDMT (see curve). The negative sequence current is determined according to the 3 phase currents. 1 2 Ii = --- × ( I1 + a I2 + aI3 ) 3

with a = e

4,64 t = ----------------------. T 0,96 ( li/lb ) b for Ii/Ib > 5 t=T

2π j ------3

If Sepam is connected to 2 phase current sensors only, the negative sequence current is: 1 Ii = ------- × I1 – a 2 I3 3

3

b for 0.5 y Ii/Ib y 5

2π j ------3

Block diagram I1 DE50557

with a = e

3,19 t = -------------------. T 1,5 ( li/lb )

I2

T

Ii > Is

0

I3 “pick-up” signal

Both formulas are equivalent when there is no zero sequence current (earth fault). Definite time protection Is is the operation set point expressed in Amps, and T is the protection operation time delay.

Characteristics

MT10550

t

Curve Setting Is set point Setting

T

Is

Ii

IDMT protection For Ii > Is, the time delay depends on the value of Ii/Ib (Ib: basis current of the protected equipment defined when the general parameters are set) T corresponds to the time delay for Ii/Ib = 5

Definite, IDMT Definite time IDMT

Resolution Accuracy (1) Time delay T (operation time at 5 Ib) Setting Definite time

Definite time protection principle.

IDMT Resolution Accuracy (1)

Definite time IDMT

Pick-up/drop-out ratio Characteristic times Operation time Overshoot time

MT10857

Reset time (1) In reference conditions (IEC 60255-6).

IDMT protection principle.

3/10

time-delayed output

10 % Ib y Is y 500 % Ib 10 % Ib y Is y 50 % Ib 1% ±5 % 100 ms y T y 300 s 100 ms y T y 1 s 10 ms ou 1 digit ±2 % or ±25 ms ±5 % or ±35 ms 93.5 % ±5 % pick-up < 55 ms < 35 ms < 55 ms




Use the table to find the value of K that corresponds to the required negative sequence current. The tripping time is equal to KT. Example given a tripping curve with the setting T = 0.5 s. What is the tripping time at 0.6 Ib? Use the table to find the value of K that corresponds to 60 % of Ib. The table reads K = 7.55. The tripping time is equal to: 0.5 x 7.55 = 3.755 s.

IDMT tripping curve t(s) MT10546

Determination of tripping time for different negative sequence current values for a given curve

10000 5000 2000 1000 500 200 100 50

3

20 max. curve (T=1s) 10 5 2 1 0.5 0.2 0,1 min. curve (T=0,1s)

0.05 0.02 0.01 0.005 0.002

I/Ib

0.001 0.05

li (% lb) K

10 99.95

0.1

0.2

0.3

0.5 0.7

1

2

3

5

7

10

20

15 54.50

20 35.44

25 25.38

30 19.32

33.33 16.51

35 15.34

40 12.56

45 10.53

50 9.00

55 8.21

57.7 7.84

60 7.55

65 7.00

70 6.52

75 6.11

li (% lb) cont’d 80 K cont’d 5.74

85 5.42

90 5.13

95 4.87

100 4.64

110 4.24

120 3.90

130 3.61

140 3.37

150 3.15

160 2.96

170 2.80

180 2.65

190 2.52

200 2.40

210 2.29

li (% lb) cont’d 22. K cont’d 2.14

230 2.10

240 2.01

250 1.94

260 1.86

270 1.80

280 1.74

290 1.68

300 1.627

310 1.577

320 1.53

330 1.485

340 1.444

350 1.404

360 1.367

370 1.332

li (% lb) cont’d 380 K cont’d 1.298

390 1.267

400 1.236

410 1.18

420 1.167

430 1.154

440 1.13

450 1.105

460 1.082

470 1.06

480 1.04

490 1.02

u 500 1

3/11


Excessive starting time, locked rotor ANSI code 48/51LR/14


Operation DE50558

This function is three-phase. It comprises two parts: b excessive starting time: during starting, the protection picks up when one of the 3 phase currents is greater than the set point Is for a longer period of time than the ST time delay (normal starting time) b locked rotor: v at the normal operating rate (after starting), the protection picks up when one of the 3 phase currents is greater than the set point Is for a longer period of time than the LT time delay of the definite time type v locked on start: large motors may have very long starting time, due to their inertia or the reduce voltage supply. This starting time is longer than the permissive rotor blocking time. To protect such a motor LTS timer initiate a trip if a start has been detected (I > Is) or if the motor speed is zero. For a normal start, the input I23 (zero-speed-switch) disable this protection.

Case of normal starting.

DE50559

Motor re-acceleration When the motor re-accelerates, it consumes a current in the vicinity of the starting current (> Is) without the current first ing through a value less than 10 % of Ib. The ST time delay, which corresponds to the normal starting time, may be reinitialized by a logic data input for particular uses (input I22). b reinitialize the excessive starting time protection b set the locked rotor protection LT time delay to a low value. Starting is detected when the current consumed is 10 % greater than the Ib current.

Block diagram ≥1

DE50560

MT10870

Case of excessive starting time.

I > 0.1Ib I1 I2 I3

ST 0 &

R

LT

0

tripping output

locked rotor output

input I22 ≥1 I > Is

&

starting time output

&

locked rotor at output

LTS 0 input I23 Case of locked rotor output.

Characteristics DE50561

3

Is set point Setting Resolution Accuracy (1) Pick-up/drop-out ratio ST, LT and LTS time delays Setting

50 % Ib y Is y 500 % Ib 1% ±5 % 93.5 % ±5 % ST LT LTS

Resolution Accuracy (1) (1) In reference conditions (IEC 60255-6). Case of starting locked rotor.

3/12

500 ms y T y 300 s 50 ms y T y 300 s 50 ms y T y 300 s 10 ms ou 1 digit ±2 % ou ±25 ms




Description

For self-ventilated rotating machines, cooling is more effective when the machine is running than when it is stopped. Running and stopping of the equipment are calculated from the value of the current: b running if I > 0.1 Ib b stopped if I < 0.1 Ib. Two time constants may be set: b T1: heat rise time constant: concerns equipment that is running b T2: cooling time constant: concerns equipment that is stopped.

This function is used to protect equipment (motors, transformers, generators, lines, capacitors) against overloads, based on measurement of the current consumed. Operation curve The protection gives a trip order when the heat rise E, calculated according to the measurement of an equivalent current Ieq, is greater than the set point Es. The greatest permissible continuous current is I = Ib Es The protection tripping time is set by the time constant T. b the calculated heat rise depends on the current consumed and the previous heat rise state. b the cold curve defines the protection tripping time based on zero heat rise. b the hot curve defines the protection tripping time based on 100 % nominal heat rise. MT10858

101

Cold curve

10

10-1

ing for ambient temperature Most machines are designed to operate at a maximum ambient temperature of 40 °C. The thermal overload function takes into the ambient temperature (Sepam equipped with the temperature sensor option (1)) to increase the calculated heat rise value when the temperature measured exceeds 40 °C. Tmax – 40°C Increase factor: fa = ----------------------------------------------------Tmax – Tambient

2

 leq ---------  lb  t --- = Ln ------------------------------2 T  leq --------- – Es  lb 

0

ing for harmonics The current measured by the thermal protection is an RMS 3-phase current which takes into harmonics up to number 17.

in which T max is the equipment’s maximum temperature (according to insulation class) T ambient is the measured temperature. (1) MET148-2 module, RTC 8 predefined for ambient temperature measurement.

10-2

Hot curve

10-3 0

5

2  leq --------- – 1  lb  t --- = Ln ------------------------------2 T  leq --------- Es  lb  –

10

Adaptation of the protection to motor thermal withstand Motor thermal protection is often set based on the hot and cold curves supplied by the machine manufacturer. To fully comply with these experimental curves, additional parameters must be set: b initial heat rise, Es0, is used to reduce the cold tripping time. 2  leq --------- – Es0   lb t modified cold curve: --- = Ln ---------------------------------2 T  leq --------- – Es  lb 

Alarm set point, tripping set point Two set points may be set for heat rise: b Es1: alarm b Es2: tripping. “Hot state” set point When the function is used to protect a motor, this fixed set point is designed for detection of the hot state used by the number of starts function. Heat rise and cooling time constants MT10420

MT10419

E 1

E 1

0,36 0 T1 Heat rise time constant.

t

ing for negative sequence current In the case of motors with coiled rotors, the presence of a negative sequence component increases the heat rise in the motor. The negative sequence component of the current is taken into in the protection by the equation leq =

0,63 0

b a second group of parameters (time constants and set points) is used to take into thermal withstand with locked rotors. This second set of parameters is taken into when the current is greater than an adjustable set point Is.

T2 Cooling time constant.

t

2

lph + K ⋅ li

2

in which Iph is the greatest phase current Ii is the negative sequence component of the current K is an adjustable factor

K may have the following values: 0 - 2.25 - 4.5 - 9 For an asynchronous motor, K is determined as follows: Cd 1 K = 2 ⋅ -------- ⋅ --------------------- – 1 in which Cn, Cd: rated torque and starting torque Cn ld 2  Ib, Id: basis current and starting current g ⋅ -----  lb g: rated slip. Saving of heat rise When the protection trips, the current heat rise, increased by 10 %, is saved (Increasing by 10 % makes it possible to take into the average heat rise of motors when starting). The saved value is reset to zero when the heat rise decreases sufficiently for the time before starting to be zero. The saved value is used when the power returns after a Sepam power failure, so as to start up again with the heat rise that triggered tripping.

3/13

3




Start inhibit The thermal overload protection can inhibit the closing of the motor’s control device until the heat rise drops back down below a value that allows restarting. This value takes into the heat rise produced by the motor when starting. The inhibition function is grouped together with the starts per hour protection and the indication START INHIBIT informs the .

information The following information is available for the : b time before restart enabled (in case of inhibition of starting) b time before tripping (with constant current) b heat rise. See chapter "Machine operation assistance functions".

Inhibition of the thermal overload protection function Tripping of the thermal overload protection function (in the case of a motor) may be locked out, when required by the process, by: b logic input I26 b remote control order TC7 (inhibit thermal overload protection). Remote control order TC13 may be used to enable the operation of the thermal overload protection function.

3

Taking into 2 transformer operating rates Power transformers often have two ventilation operating rates: b ONAN (Oil Natural, Air Natural) b ONAF (Oil Natural, Air Forced). The two groups of thermal overload protection parameters enable both of these operating rates to be taken into . Switching from one group of thermal settings to the other is controlled by logic input I26. Switching is carried out without any loss of the thermal capacity used value. Taking into 2 motor operating rates Switching from one set of thermal settings to the other is controlled by. b logic input I26 b overrun of a set point by the equivalent current. The 2 groups of thermal overload protection parameters enable both operating rates to be taken into . Switching is carried out without any loss of the thermal capacity used value.

DE50243

Block diagram

3/14

Characteristics Set points Setting

Resolution Time constants Setting

Es1 alarm set point Es2 tripping set point Es0 initial heat rise

T1 running (heat rise) T2 stopped (cooling)

group A 50 % to 300 % 50 % to 300 % 0 to 100 % 1%

group B 50 % to 300 % 50 % to 300 % 0 to 100 % 1%

1 mn to 120 mn 5 mn to 600 mn 1 mn

1 mn to 120 mn 5 mn to 600 mn 1 mn

Resolution ing for negative sequence component Setting K 0 – 2.25 – 4.5 – 9 Maximum equipment temperature (according to insulation class) (2) Setting T max 60° to 200° Resolution 1° Tripping time Accuracy (1) 2% Change of setting parameters By current threshold for motor Is set point 0.25 to 8 Ib By digital input for transformer Input I26 (1) In reference conditions (IEC 60255-8). (2) Equipment manufacturer data.




Setting examples

Example 1 The following data are available: b time constants for on operation T1 and off operation T2: v T1 = 25 min v T2 = 70 min b maximum curve in steady state: Imax/Ib = 1.05. Setting of tripping set point Es2 Es2 = (Imax/Ib)2 = 110 % Please note: if the motor absorbs a current of 1.05 Ib in steady state, the heat rise calculated by the thermal overload protection will reach 110 %. Setting of alarm set point Es1 Es1 = 90 % (I/Ib = 0.95). Knegative: 4.5 (usual value) The other thermal overload parameters do not need to be set. They are not taken into by default.

Example 2 The following data are available: b motor thermal resistance in the form of hot and cold curves (see solid line curves in Figure 1) b cooling time constant T2 b maximum steady state current: Imax/Ib = 1.05. Setting of tripping set point Es2 Es2 = (Imax/Ib)2 = 110 % Setting of alarm set point Es1: Es1 = 90 % (I/Ib = 0.95). The manufacturer’s hot/cold curves (1) may be used to determine the heating time constant T1. The approach consists of placing the Sepam hot/cold curves below the motor curves.

DE50368

Figure 1: motor thermal resistance and thermal overload tripping curves motor cold curve

time before tripping / s

Sepam hot curve

70

2

Setting of tripping set point Es2 Es2 = (Imax/Ib)2 = 120 % Setting of alarm set point Es1 Es1 = 90 % (I/Ib = 0.95). The time constant T1 is calculated so that the thermal overload protection trips after 100 s (point 1). With t/T1 = 0.069 (I/Ib = 2 and Es2 = 120 %): ⇒ T1 = 100 s / 0.069 = 1449 sec ≈ 24 min. The tripping time starting from the cold state is equal to: t/T1 = 0.3567 ⇒ t = 24 min 0.3567 = 513 s (point 2’). This tripping time is too long since the limit for this overload current is 400 s (point 2). If the time constant T1 is lowered, the thermal overload protection will trip earlier, below point 2. There risk that motor starting when hot will not be possible also exists in this case (see Figure 2 in which a lower Sepam hot curve would intersect the starting curve with U = 0.9 Un). The Es0 parameter is a setting that is used to solve these differences by lowering the Sepam cold curve without moving the hot curve. In this example, the thermal overload protection should trip after 400 s starting from the cold state. The following equation is used to obtain the Es0 value: t ne ces sary 2 ---------------------2 T l processed processed . l------------------Es0 = -------------------- – e 1 - – Es2 lb l

(1) When the machine manufacturer provides both a time constant T1 and the machine hot/cold curves, the use of the curves is recommended since they are more accurate. (2) The charts containing the numerical values of the Sepam hot curve may be used, or else the equation of the curve which is given on page 3/13.

1

1.05

The following data are available: b motor thermal resistance in the form of hot and cold curves (see solid line curves in Figure 1), b cooling time constant T2 b maximum steady state current: Imax/Ib = 1.1.

with: t necessary : tripping time necessary starting from a cold state. I processed : equipment current.

motor hot curve

2

Example 3

b

Sepam cold curve 665

For an overload of 2 Ib, the value t/T1 = 0.0339 (2) is obtained. In order for Sepam to trip at the point 1 (t = 70 s), T1 is equal to 2065 sec ≈ 34 min. With a setting of T1 = 34 min, the tripping time is obtained based on a cold state (point 2). In this case, it is equal to t/T1 = 0.3216 ⇒ t ⇒ 665 sec, i.e. ≈ 11 min, which is compatible with the thermal resistance of the motor when cold. The negative sequence factor is calculated using the equation defined on page 3/13. The parameters of the second thermal overload relay do not need to be set. They are not taken into by default.

I/Ib

3/15

3




Setting examples

Use of the additional setting group When a motor rotor is locked or is turning very slowly, its thermal behavior is different from that with the rated load. In such conditions, the motor is damaged by overheating of the rotor or stator. For high power motors, rotor overheating is most often a limiting factor. The thermal overload parameters chosen for operation with a low overload are no longer valid. In order to protect the motor in this case, “excessive starting time” protection may be used. Nevertheless, motor manufacturers provide the thermal resistance curves when the rotor is locked, for different voltages at the time of starting.

In numerical values, the following is obtained: Es0 = 4 – e

400 sec --------------------------24∗ 60sec

= 0.3035 ≈ 31%

By setting Es0 = 31 %, point 2’ is moved downward to obtain a shorter tripping time that is compatible with the motor’s thermal resistance when cold (see Figure 3). Please note: A setting Es0 = 100 % therefore means that the hot and cold curves are the same. Figure 2: hot/cold curves not compatible with the motor’s thermal resistance

Figure 4: Locked rotor thermal resistance

2’ 2

100

MT10863

motor cold curve motor hot curve

times / s


513 400

locked rotor

motor running

Sepam hot curve

1

1

3 2

starting at Un starting at 0.9 Un 1.05

I/Ib

2

4 1.1

DE50370

adjusted Sepam cold curve

100

2

motor hot curve

1

Sepam hot curve

starting at Un starting at 0.9 Un 1.1

3/16

2

5

Is

6 I/Ib

In order to take these curves into , the second thermal overload relay may be used. The time constant in this case is, in theory, the shortest one: however, it should not be determined in the same way as that of the first relay. The thermal overload protection switches between the first and second relay if the equivalent current Ieq exceeds the Is value (set point current).

motor cold curve 400

2

➀: thermal resistance, motor running ➁: thermal resistance, motor stopped ➂: Sepam tripping curve ➃: starting at 65 % Un ➄: starting at 80 % Un ➅: starting at 100 % Un

Figure 3: hot/cold curves compatible with the motor’s thermal resistance via the setting of an initial heat rise Es0


3

DE50369

Sepam cold curve

I/Ib




Setting examples

Cold curves for Es0 = 0 l/Ib 1.00 Es (%) 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200

0.6931 0.7985 0.9163 1.0498 1.2040 1.3863 1.6094 1.8971 2.3026

1.05

1.10

1.15

1.20

1.25

1.30

1.35

1.40

1.45

1.50

1.55

1.60

1.65

1.70

1.75

1.80

0.6042 0.6909 0.7857 0.8905 1.0076 1.1403 1.2933 1.4739 1.6946 1.9782 2.3755 3.0445

0.5331 0.6061 0.6849 0.7704 0.8640 0.9671 1.0822 1.2123 1.3618 1.5377 1.7513 2.0232 2.3979 3.0040

0.4749 0.5376 0.6046 0.6763 0.7535 0.8373 0.9287 1.0292 1.1411 1.2670 1.4112 1.5796 1.7824 2.0369 2.3792 2.9037

0.4265 0.4812 0.5390 0.6004 0.6657 0.7357 0.8109 0.8923 0.9808 1.0780 1.1856 1.3063 1.4435 1.6025 1.7918 2.0254 2.3308 2.7726

0.3857 0.4339 0.4845 0.5379 0.5942 0.6539 0.7174 0.7853 0.8580 0,9365 1.0217 1.1147 1.2174 1.3318 1.4610 1.6094 1.7838 1.9951 2.2634 2.6311 3.2189

0.3508 0.3937 0.4386 0.4855 0.5348 0.5866 0.6413 0.6991 0.7605 0.8258 0.8958 0.9710 1.0524 1.1409 1.2381 1.3457 1.4663 1.6035 1.7626 1.9518 2.1855 2.4908 2.9327

0.3207 0.3592 0.3993 0.4411 0.4847 0.5302 0.5780 0.6281 0.6809 0.7366 0.7956 0.8583 0.9252 0,9970 1.0742 1.1580 1.2493 1.3499 1.4618 1.5877 1.7319 1.9003 2.1030 2.3576 2.6999 3.2244

0.2945 0.3294 0.3655 0.4029 0.4418 0.4823 0.5245 0.5686 0.6147 0.6630 0.7138 0.7673 0.8238 0.8837 0.9474 1.0154 1.0885 1.1672 1.2528 1.3463 1.4495 1.5645 1.6946 1.8441 2.0200 2.2336 2.5055 2.8802 3.4864

0.2716 0.3033 0.3360 0.3698 0.4049 0.4412 0.4788 0.5180 0.5587 0.6012 0.6455 0.6920 0.7406 0.7918 0.8457 0.9027 0.9632 1.0275 1.0962 1.1701 1.2498 1.3364 1.4313 1.5361 1.6532 1.7858 1.9388 2.1195 2.3401 2.6237 3.0210

0.2513 0.2803 0.3102 0.3409 0.3727 0.4055 0.4394 0.4745 0.5108 0.5486 0.5878 0.6286 0.6712 0.7156 0.7621 0.8109 0.8622 0.9163 0.9734 1.0341 1.0986 1.1676 1.2417 1.3218 1.4088 1.5041 1.6094 1.7272 1.8608 2.0149 2.1972

0.2333 0.2600 0.2873 0.3155 0.3444 0.3742 0.4049 0.4366 0.4694 0.5032 0.5383 0.5746 0.6122 0.6514 0.6921 0.7346 0.7789 0.8253 0.8740 0.9252 0.9791 1.0361 1.0965 1.1609 1.2296 1.3035 1.3832 1.4698 1.5647 1.6695 1.7866

0.2173 0.2419 0.2671 0.2929 0.3194 0.3467 0.3747 0.4035 0.4332 0.4638 0.4953 0.5279 0.5616 0.5964 0.6325 0.6700 0.7089 0.7494 0.7916 0.8356 0.8817 0.9301 0.9808 1.0343 1.0908 1.1507 1.2144 1.2825 1.3555 1.4343 1.5198

0.2029 0.2257 0.2490 0.2728 0.2972 0.3222 0.3479 0.3743 0.4013 0.4292 0.4578 0,4872 0.5176 0.5489 0.5812 0.6146 0.6491 0.6849 0.7220 0.7606 0.8007 0.8424 0.8860 0.9316 0.9793 1.0294 1.0822 1.1379 1.1970 1.2597 1.3266

0.1900 0.2111 0.2327 0.2548 0.2774 0.3005 0.3241 0.3483 0.3731 0.3986 0.4247 0,4515 0.4790 0.5074 0.5365 0.5666 0.5975 0.6295 0.6625 0.6966 0.7320 0.7686 0.8066 0.8461 0.8873 0.9302 0.9751 1.0220 1.0713 1.1231 1.1778

0.1782 0.1980 0.2181 0.2386 0.2595 0.2809 0.3028 0.3251 0.3480 0.3714 0.3953 0,4199 0.4450 0.4708 0.4973 0.5245 0.5525 0.5813 0.6109 0.6414 0.6729 0.7055 0.7391 0.7739 0.8099 0.8473 0.8861 0.9265 0.9687 1.0126 1.0586

0.1676 0.1860 0.2048 0.2239 0.2434 0.2633 0.2836 0.3043 0.3254 0.3470 0.3691 0,3917 0.4148 0.4384 0.4626 0.4874 0.5129 0.5390 0.5658 0.5934 0.6217 0.6508 0.6809 0.7118 0.7438 0.7768 0.8109 0.8463 0.8829 0.9209 0.9605

3/17

3




Setting examples

Cold curves for Es0 = 0 I/Ib Es (%)

3

50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200

3/18

1.85

1.90

1.95

2.00

2.20

2.40

2.60

2.80

3.00

3.20

3.40

3.60

3.80

4.00

4.20

4.40

4.60

0.1579 0.1752 0.1927 0.2106 0.2288 0.2474 0.2662 0.2855 0.3051 0.3251 0.3456 0.3664 0.3877 0.4095 0.4317 0.4545 0.4778 0.5016 0.5260 0.5511 0.5767 0.6031 0.6302 0.6580 0.6866 0.7161 0.7464 0.7777 0.8100 0.8434 0.8780

0.1491 0.1653 0.1818 0.1985 0.2156 0.2329 0.2505 0.2685 0.2868 0.3054 0.3244 0.3437 0.3634 0.3835 0.4041 0.4250 0.4465 0.4683 0.4907 0.5136 0.5370 0.5610 0.5856 0.6108 0.6366 0.6631 0.6904 0.7184 0.7472 0.7769 0.8075

0.1410 0.1562 0.1717 0.1875 0.2035 0.2197 0.2362 0.2530 0.2701 0.2875 0.3051 0.3231 0.3415 0.3602 0.3792 0.3986 0.4184 0.4386 0.4591 0.4802 0.5017 0.5236 0.5461 0.5690 0.5925 0.6166 0.6413 0.6665 0.6925 0.7191 0.7465

0.1335 0.1479 0.1625 0.1773 0.1924 0.2076 0.2231 0.2389 0.2549 0.2712 0.2877 0.3045 0.3216 0.3390 0.3567 0.3747 0.3930 0.4117 0.4308 0.4502 0.4700 0.4902 0.5108 0.5319 0.5534 0.5754 0.5978 0.6208 0.6444 0.6685 0.6931

0.1090 0.1206 0.1324 0.1442 0.1562 0.1684 0.1807 0.1931 0.2057 0.2185 0.2314 0.2445 0.2578 0.2713 0.2849 0.2988 0.3128 0.3270 0.3414 0.3561 0.3709 0.3860 0.4013 0.4169 0.4327 0.4487 0.4651 0.4816 0.4985 0.5157 0.5331

0.0908 0.1004 0.1100 0.1197 0.1296 0.1395 0.1495 0.1597 0.1699 0.1802 0.1907 0.2012 0.2119 0.2227 0.2336 0.2446 0.2558 0.2671 0.2785 0.2900 0.3017 0.3135 0.3254 0.3375 0.3498 0.3621 0.3747 0.3874 0.4003 0.4133 0.4265

0.0768 0.0849 0.0929 0.1011 0.1093 0.1176 0.1260 0.1344 0.1429 0.1514 0.1601 0.1688 0.1776 0.1865 0.1954 0.2045 0.2136 0.2228 0.2321 0.2414 0.2509 0.2604 0.2701 0.2798 0.2897 0.2996 0.3096 0.3197 0.3300 0.3403 0.3508

0.0659 0.0727 0.0796 0.0865 0.0935 0.1006 0.1076 0.1148 0.1219 0.1292 0.1365 0.1438 0.1512 0.1586 0.1661 0.1737 0.1813 0.1890 0.1967 0.2045 0.2124 0.2203 0.2283 0.2363 0.2444 0.2526 0.2608 0.2691 0.2775 0.2860 0.2945

0.0572 0.0631 0.069 0.075 0.081 0.087 0.0931 0.0992 0.1054 0.1116 0.1178 0.1241 0.1304 0.1367 0.1431 0.1495 0.156 0.1625 0.1691 0.1757 0.1823 0.189 0.1957 0.2025 0.2094 0.2162 0.2231 0.2301 0.2371 0.2442 0.2513

0.0501 0.0552 0.0604 0.0656 0.0708 0.0761 0.0813 0.0867 0.092 0.0974 0.1028 0.1082 0.1136 0.1191 0.1246 0.1302 0.1358 0.1414 0.147 0.1527 0.1584 0.1641 0.1699 0.1757 0.1815 0.1874 0.1933 0.1993 0.2052 0.2113 0.2173

0.0442 0.0487 0.0533 0.0579 0.0625 0.0671 0.0717 0.0764 0.0811 0.0858 0.0905 0.0952 0.1000 0.1048 0.1096 0.1144 0.1193 0.1242 0.1291 0.1340 0.1390 0.1440 0.1490 0.1540 0.1591 0.1641 0.1693 0.1744 0.1796 0.1847 0.1900

0.0393 0.0434 0.0474 0.0515 0.0555 0.0596 0.0637 0.0678 0.0720 0.0761 0.0803 0.0845 0.0887 0.0929 0.0972 0.1014 0.1057 0.1100 0.1143 0.1187 0.1230 0.1274 0.1318 0.1362 0.1406 0.1451 0.1495 0.1540 0.1585 0.1631 0.1676

0.0352 0.0388 0.0424 0.0461 0.0497 0.0533 0.0570 0.0607 0.0644 0.0681 0.0718 0.0755 0.0792 0.0830 0.0868 0.0905 0.0943 0.0982 0.1020 0.1058 0.1097 0.1136 0.1174 0.1213 0.1253 0.1292 0.1331 0.1371 0.1411 0.1451 0.1491

0.0317 0.0350 0.0382 0.0415 0.0447 0.0480 0.0513 0.0546 0.0579 0.0612 0.0645 0.0679 0.0712 0.0746 0.0780 0.0813 0.0847 0.0881 0.0916 0.0950 0.0984 0.1019 0.1054 0.1088 0.1123 0.1158 0.1193 0.1229 0.1264 0.1300 0.1335

0.0288 0.0317 0.0346 0.0375 0.0405 0.0434 0.0464 0.0494 0.0524 0.0554 0.0584 0.0614 0.0644 0.0674 0.0705 0.0735 0.0766 0.0796 0.0827 0.0858 0.0889 0.0920 0.0951 0.0982 0.1013 0.1045 0.1076 0.1108 0.1140 0.1171 0.1203

0.0262 0.0288 0.0315 0.0342 0.0368 0.0395 0.0422 0.0449 0.0476 0.0503 0.0530 0.0558 0.0585 0.0612 0.0640 0.0667 0.0695 0.0723 0.0751 0.0778 0.0806 0.0834 0.0863 0.0891 0.0919 0.0947 0.0976 0.1004 0.1033 0.1062 0.1090

0.0239 0.0263 0.0288 0.0312 0.0336 0.0361 0.0385 0.0410 0.0435 0.0459 0.0484 0.0509 0.0534 0.0559 0.0584 0.0609 0.0634 0.0659 0.0685 0.0710 0.0735 0.0761 0.0786 0.0812 0.0838 0.0863 0.0889 0.0915 0.0941 0.0967 0.0993




Setting examples

Cold curves for Es0 = 0 I/Ib Es (%) 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200

4.80

5.00

5.50

6.00

6.50

7.00

7.50

8.00

8.50

9.00

9.50

10.00

12.50

15.00

17.50

20.00

0.0219 0.0242 0.0264 0.0286 0.0309 0.0331 0.0353 0.0376 0.0398 0.0421 0.0444 0.0466 0.0489 0.0512 0.0535 0.0558 0.0581 0.0604 0.0627 0.0650 0.0673 0.0696 0.0720 0.0743 0.0766 0.0790 0.0813 0.0837 0.0861 0.0884 0.0908

0.0202 0.0222 0.0243 0.0263 0.0284 0.0305 0.0325 0.0346 0.0367 0.0387 0.0408 0.0429 0.0450 0.0471 0.0492 0.0513 0.0534 0.0555 0.0576 0.0598 0.0619 0.0640 0.0661 0.0683 0.0704 0.0726 0.0747 0.0769 0.0790 0.0812 0.0834

0.0167 0.0183 0.0200 0.0217 0.0234 0.0251 0.0268 0.0285 0.0302 0.0319 0.0336 0.0353 0.0370 0.0388 0.0405 0.0422 0.0439 0.0457 0.0474 0.0491 0.0509 0.0526 0.0543 0.0561 0.0578 0.0596 0.0613 0.0631 0.0649 0.0666 0.0684

0.0140 0.0154 0.0168 0.0182 0.0196 0.0211 0.0225 0.0239 0.0253 0.0267 0.0282 0.0296 0.0310 0.0325 0.0339 0.0353 0.0368 0.0382 0.0397 0.0411 0.0426 0.0440 0.0455 0.0469 0.0484 0.0498 0.0513 0.0528 0.0542 0.0557 0.0572

0.0119 0.0131 0.0143 0.0155 0.0167 0.0179 0.0191 0.0203 0.0215 0.0227 0.0240 0.0252 0.0264 0.0276 0.0288 0.0300 0.0313 0.0325 0.0337 0.0349 0.0361 0.0374 0.0386 0.0398 0.0411 0.0423 0.0435 0.0448 0.0460 0.0473 0.0485

0.0103 0.0113 0.0123 0.0134 0.0144 0.0154 0.0165 0.0175 0.0185 0.0196 0.0206 0.0217 0.0227 0.0237 0.0248 0.0258 0.0269 0.0279 0.0290 0.0300 0.0311 0.0321 0.0332 0.0343 0.0353 0.0364 0.0374 0.0385 0.0395 0.0406 0.0417

0.0089 0.0098 0.0107 0.0116 0.0125 0.0134 0.0143 0.0152 0.0161 0.0170 0.0179 0.0188 0.0197 0.0207 0.0216 0.0225 0.0234 0.0243 0.0252 0.0261 0.0270 0.0279 0.0289 0.0298 0.0307 0.0316 0.0325 0.0334 0.0344 0.0353 0.0362

0.0078 0.0086 0.0094 0.0102 0.0110 0.0118 0.0126 0.0134 0.0142 0.0150 0.0157 0.0165 0.0173 0.0181 0.0189 0.0197 0.0205 0.0213 0.0221 0.0229 0.0237 0.0245 0.0253 0.0261 0.0269 0.0277 0.0285 0.0293 0.0301 0.0309 0.0317

0.0069 0.0076 0.0083 0.0090 0.0097 0.0104 0.0111 0.0118 0.0125 0.0132 0.0139 0.0146 0.0153 0.0160 0.0167 0.0175 0.0182 0.0189 0.0196 0.0203 0.0210 0.0217 0.0224 0.0231 0.0238 0.0245 0.0252 0.0259 0.0266 0.0274 0.0281

0.0062 0.0068 0.0074 0.0081 0.0087 0.0093 0.0099 0.0105 0.0112 0.0118 0.0124 0.0130 0.0137 0.0143 0.0149 0.0156 0.0162 0.0168 0.0174 0.0181 0.0187 0.0193 0.0200 0.0206 0.0212 0.0218 0.0225 0.0231 0.0237 0.0244 0.0250

0.0056 0.0061 0.0067 0.0072 0.0078 0.0083 0.0089 0.0095 0.0100 0.0106 0.0111 0.0117 0.0123 0.0128 0.0134 0.0139 0.0145 0.0151 0.0156 0.0162 0.0168 0.0173 0.0179 0.0185 0.0190 0.0196 0.0201 0.0207 0.0213 0.0218 0.0224

0.0050 0.0055 0.0060 0.0065 0.0070 0.0075 0.0080 0.0085 0.0090 0.0095 0.0101 0.0106 0.0111 0.0116 0.0121 0.0126 0.0131 0.0136 0.0141 0.0146 0.0151 0.0156 0.0161 0.0166 0.0171 0.0177 0.0182 0.0187 0.0192 0.0197 0.0202

0.0032 0.0035 0.0038 0.0042 0.0045 0.0048 0.0051 0.0055 0.0058 0.0061 0.0064 0.0067 0.0071 0.0074 0.0077 0.0080 0.0084 0.0087 0.0090 0.0093 0.0096 0.0100 0.0103 0.0106 0.0109 0.0113 0.0116 0.0119 0.0122 0.0126 0.0129

0.0022 0.0024 0.0027 0.0029 0.0031 0.0033 0.0036 0.0038 0.0040 0.0042 0.0045 0.0047 0.0049 0.0051 0.0053 0.0056 0.0058 0.0060 0.0062 0.0065 0.0067 0.0069 0.0071 0.0074 0.0076 0.0078 0.0080 0.0083 0.0085 0.0087 0.0089

0.0016 0.0018 0.0020 0.0021 0.0023 0.0025 0.0026 0.0028 0.0029 0.0031 0.0033 0.0034 0.0036 0.0038 0.0039 0.0041 0.0043 0.0044 0.0046 0.0047 0.0049 0.0051 0.0052 0.0054 0.0056 0.0057 0.0059 0.0061 0.0062 0.0064 0.0066

0.0013 0.0014 0.0015 0.0016 0.0018 0.0019 0.0020 0.0021 0.0023 0.0024 0.0025 0.0026 0.0028 0.0029 0.0030 0.0031 0.0033 0.0034 0.0035 0.0036 0.0038 0.0039 0.0040 0.0041 0.0043 0.0044 0.0045 0.0046 0.0048 0.0049 0.0050

3/19

3




Setting examples

Hot curves for Es0 = 0

3

I/Ib Es (%) 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200

1.00

I/Ib Es (%) 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200

3/20

1.05

1.10

1.15

1.20

1.25

1.30

1.35

1.40

1.45

1.50

1.55

1.60

1.65

1.70

1.75

1.80

0.6690 0.2719 0.1685 3.7136 0.6466 0.3712 1.2528 0.6257 3.0445 0.9680 1.4925 2.6626

0.1206 0.2578 0.4169 0.6061 0.8398 1.1451 1.5870 2.3979

0.0931 0.1957 0.3102 0.4394 0.5878 0.7621 0.9734 1.2417 1.6094 2.1972 3.8067

0.0752 0.1566 0.2451 0.3423 0.4499 0.5705 0.7077 0.8668 1.0561 1.2897 1.5950 2.0369 2.8478

0.0627 0.1296 0.2013 0.2786 0.3623 0.4537 0.5543 0.6662 0.7921 0.9362 1.1047 1.3074 1.5620 1.9042 2.4288 3.5988

0.0535 0.1100 0.1699 0.2336 0.3017 0.3747 0.4535 0.5390 0.6325 0.7357 0.8508 0.9808 1.1304 1.3063 1.5198 1.7918 2.1665 2.7726 4.5643

0.0464 0.0951 0.1462 0.2002 0.2572 0.3176 0.3819 0.4507 0.5245 0.6042 0.6909 0.7857 0.8905 1.0076 1.1403 1.2933 1.4739 1.6946 1.9782 2.3755

0.0408 0.0834 0.1278 0.1744 0.2231 0.2744 0.3285 0.3857 0.4463 0.5108 0.5798 0.6539 0.7340 0.8210 0.9163 1.0217 1.1394 1.2730 1.4271 1.6094

0.0363 0.0740 0.1131 0.1539 0.1963 0.2407 0.2871 0.3358 0.3869 0.4408 0.4978 0.5583 0.6226 0.6914 0.7652 0.8449 0.9316 1.0264 1.1312 1.2483

0.0326 0.0662 0.1011 0.1372 0.1747 0.2136 0.2541 0.2963 0.3403 0.3864 0.4347 0.4855 0.5390 0.5955 0.6554 0.7191 0.7872 0.8602 0.9390 1.0245

0.0295 0.0598 0.0911 0.1234 0.1568 0.1914 0.2271 0.2643 0.3028 0.3429 0.3846 0.4282 0.4738 0.5215 0.5717 0.6244 0.6802 0.7392 0.8019 0.8688

0.0268 0.0544 0.0827 0.1118 0.1419 0.1728 0.2048 0.2378 0.2719 0.3073 0.3439 0.3819 0.4215 0.4626 0.5055 0.5504 0.5974 0.6466 0.6985 0.7531

0.0245 0.0497 0.0755 0.1020 0.1292 0.1572 0.1860 0.2156 0.2461 0.2776 0.3102 0.3438 0.3786 0.4146 0.4520 0.4908 0.5312 0.5733 0.6173 0.6633

0.0226 0.0457 0.0693 0.0935 0.1183 0.1438 0.1699 0.1967 0.2243 0.2526 0.2817 0.3118 0.3427 0.3747 0.4077 0.4418 0.4772 0.5138 0.5518 0.5914

1.85

1.90

1.95

2.00

2.20

2.40

2.60

2.80

3.00

3,20

3,40

3.60

3.80

4.00

4.20

4.40

4.60

0.0209 0.0422 0.0639 0.0862 0.1089 0.1322 0.1560 0.1805 0.2055 0.2312 0.2575 0.2846 0.3124 0.3410 0.3705 0.4008 0.4321 0.4644 0.4978 0.5324

0.0193 0.0391 0.0592 0.0797 0.1007 0.1221 0.1440 0.1664 0.1892 0.2127 0.2366 0.2612 0.2864 0.3122 0.3388 0.3660 0.3940 0.4229 0.4525 0.4831

0.0180 0.0363 0.0550 0.0740 0.0934 0.1132 0.1334 0.1540 0.1750 0.1965 0.2185 0.2409 0.2639 0.2874 0.3115 0.3361 0.3614 0.3873 0.4140 0.4413

0.0168 0.0339 0.0513 0.0690 0.0870 0.1054 0.1241 0.1431 0.1625 0.1823 0.2025 0.2231 0.2442 0.2657 0.2877 0.3102 0.3331 0.3567 0.3808 0.4055

0.0131 0.0264 0.0398 0.0535 0.0673 0.0813 0.0956 0.1100 0.1246 0.1395 0.1546 0.1699 0.1855 0.2012 0.2173 0.2336 0.2502 0.2671 0.2842 0.3017

0.0106 0.0212 0.0320 0.0429 0.0540 0.0651 0.0764 0.0878 0.0993 0.1110 0.1228 0.1347 0.1468 0.1591 0.1715 0.1840 0.1967 0.2096 0.2226 0.2358

0.0087 0.0175 0.0264 0.0353 0.0444 0.0535 0.0627 0.0720 0.0813 0.0908 0.1004 0.1100 0.1197 0.1296 0.1395 0.1495 0.1597 0.1699 0.1802 0.1907

0.0073 0.0147 0.0222 0.0297 0.0372 0.0449 0.0525 0.0603 0.0681 0.0759 0.0838 0.0918 0.0999 0.1080 0.1161 0.1244 0.1327 0.1411 0.1495 0.1581

0.0063 0.0126 0.0189 0.0253 0.0317 0.0382 0.0447 0.0513 0.0579 0.0645 0.0712 0.0780 0.0847 0.0916 0.0984 0.1054 0.1123 0.1193 0.1264 0.1335

0.0054 0.0109 0.0164 0.0219 0.0274 0.0330 0.0386 0.0443 0.0499 0.0556 0.0614 0.0671 0.0729 0.0788 0.0847 0.0906 0.0965 0.1025 0.1085 0.1145

0.0047 0.0095 0.0143 0.0191 0.0240 0.0288 0.0337 0.0386 0.0435 0.0485 0.0535 0.0585 0.0635 0.0686 0.0737 0.0788 0.0839 0.0891 0.0943 0.0995

0.0042 0.0084 0.0126 0.0169 0.0211 0.0254 0.0297 0.0340 0.0384 0.0427 0.0471 0.0515 0.0559 0.0603 0.0648 0.0692 0.0737 0.0782 0.0828 0.0873

0.0037 0.0075 0.0112 0.0150 0.0188 0.0226 0.0264 0.0302 0.0341 0.0379 0.0418 0.0457 0.0496 0.0535 0.0574 0.0614 0.0653 0.0693 0.0733 0.0773

0.0033 0.0067 0.0101 0.0134 0.0168 0.0202 0.0236 0.0270 0.0305 0.0339 0.0374 0.0408 0.0443 0.0478 0.0513 0.0548 0.0583 0.0619 0.0654 0.0690

0.0030 0.0060 0.0091 0.0121 0.0151 0.0182 0.0213 0.0243 0.0274 0.0305 0.0336 0.0367 0.0398 0.0430 0.0461 0.0493 0.0524 0.0556 0.0588 0.0620

0.0027 0.0055 0.0082 0.0110 0.0137 0.0165 0.0192 0.0220 0.0248 0.0276 0.0304 0.0332 0.0360 0.0389 0.0417 0.0446 0.0474 0.0503 0.0531 0.0560

0.0025 0.0050 0.0075 0.0100 0.0125 0.0150 0.0175 0.0200 0.0226 0.0251 0.0277 0.0302 0.0328 0.0353 0.0379 0.0405 0.0431 0.0457 0.0483 0.0509




Setting examples

Hot curves for Es0 = 0 I/Ib Es (%) 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200

4.80

5.00

5.50

6.00

6.50

7.00

7.50

8.00

8.50

9.00

9.50

10.00

12.50

15.00

17.50

20.00

0.0023 0.0045 0.0068 0.0091 0.0114 0.0137 0.0160 0.0183 0.0206 0.0229 0.0253 0.0276 0.0299 0.0323 0.0346 0.0370 0.0393 0.0417 0.0441 0.0464

0.0021 0.0042 0.0063 0.0084 0.0105 0.0126 0.0147 0.0168 0.0189 0.0211 0.0232 0.0253 0.0275 0.0296 0.0317 0.0339 0.0361 0.0382 0.0404 0.0426

0.0017 0.0034 0.0051 0.0069 0.0086 0.0103 0.0120 0.0138 0.0155 0.0172 0.0190 0.0207 0.0225 0.0242 0.0260 0.0277 0.0295 0.0313 0.0330 0.0348

0.0014 0.0029 0.0043 0.0057 0.0072 0.0086 0.0101 0.0115 0.0129 0.0144 0.0158 0.0173 0.0187 0.0202 0.0217 0.0231 0.0246 0.0261 0.0275 0.0290

0.0012 0.0024 0.0036 0.0049 0.0061 0.0073 0.0085 0.0097 0.0110 0.0122 0.0134 0.0147 0.0159 0.0171 0.0183 0.0196 0.0208 0.0221 0.0233 0.0245

0.0010 0.0021 0.0031 0.0042 0.0052 0.0063 0.0073 0.0084 0.0094 0.0105 0.0115 0.0126 0.0136 0.0147 0.0157 0.0168 0.0179 0.0189 0.0200 0.0211

0.0009 0.0018 0.0027 0.0036 0.0045 0.0054 0.0064 0.0073 0.0082 0.0091 0.0100 0.0109 0.0118 0.0128 0.0137 0.0146 0.0155 0.0164 0.0173 0.0183

0.0008 0.0016 0.0024 0.0032 0.0040 0.0048 0.0056 0.0064 0.0072 0.0080 0.0088 0.0096 0.0104 0.0112 0.0120 0.0128 0.0136 0.0144 0.0152 0.0160

0.0007 0.0014 0.0021 0.0028 0.0035 0.0042 0.0049 0.0056 0.0063 0.0070 0.0077 0.0085 0.0092 0.0099 0.0106 0.0113 0.0120 0.0127 0.0134 0.0141

0.0006 0.0013 0.0019 0.0025 0.0031 0.0038 0.0044 0.0050 0.0056 0.0063 0.0069 0.0075 0.0082 0.0088 0.0094 0.0101 0.0107 0.0113 0.0119 0.0126

0.0006 0.0011 0.0017 0.0022 0.0028 0.0034 0.0039 0.0045 0.0051 0.0056 0.0062 0.0067 0.0073 0.0079 0.0084 0.0090 0.0096 0.0101 0.0107 0.0113

0.0005 0.0010 0.0015 0.0020 0.0025 0.0030 0.0035 0.0040 0.0046 0.0051 0.0056 0.0061 0.0066 0.0071 0.0076 0.0081 0.0086 0.0091 0.0096 0.0102

0.0003 0.0006 0.0010 0.0013 0.0016 0.0019 0.0023 0.0026 0.0029 0.0032 0.0035 0.0039 0.0042 0.0045 0.0048 0.0052 0.0055 0.0058 0.0061 0.0065

0.0002 0.0004 0.0007 0.0009 0.0011 0.0013 0.0016 0.0018 0.0020 0.0022 0.0025 0.0027 0.0029 0.0031 0.0034 0.0036 0.0038 0.0040 0.0043 0.0045

0.0002 0.0003 0.0005 0.0007 0.0008 0.0010 0.0011 0.0013 0.0015 0.0016 0.0018 0.0020 0.0021 0.0023 0.0025 0.0026 0.0028 0.0030 0.0031 0.0033

0.0001 0.0003 0.0004 0.0005 0.0006 0.0008 0.0009 0.0010 0.0011 0.0013 0.0014 0.0015 0.0016 0.0018 0.0019 0.0020 0.0021 0.0023 0.0024 0.0025

3/21

3




Description

The Is setting is the vertical asymptote of the curve, and T is the operation time delay for 10 Is. The tripping time for I/Is values of less than 1.2 depends on the type of curve chosen.

The phase overcurrent function comprises 4 independant elements divided into two groups of 2 elements called Group A and Group B respectively. The use of the two groups may be chosen by parameter setting: b operation with Group A or Group B exclusively, with switching from one group to the other dependent on the state of logic input I13 exclusively, or by remote control (TC3, TC4), I13 = 0 group A l13 = 1 group B b operation with Group A and Group B active for 4-set point operation, b enabling/disabling of each group of 2 elements (A, B).

3

Name of curve

Type

Standard inverse time (SIT) Very inverse time (VIT or LTI) Extremely inverse time (EIT) Ultra inverse time (UIT) RI curve IEC standard inverse time SIT / A IEC very inverse time VIT or LTI / B IEC extremely inverse time EIT / C IEEE moderately inverse (IEC / D) IEEE very inverse (IEC / E) IEEE extremely inverse (IEC / F) IAC inverse IAC very inverse IAC extremely inverse

Operation The phase overcurrent protection function is three-pole. It picks up if one, two or three of the phase currents reach the operation set point. It is time-delayed. The time delay may be definite time (DT) or IDMT according to the curves opposite.

1.2 1.2 1.2 1.2 1 1 1 1 1 1 1 1 1 1

The curve equations are given in the chapter entitled "IDMT protection functions".

Definite time protection Is is the operation set point expressed in Amps, and T is the protection operation time delay.

The function takes into current variations during the time delay interval. For currents with a very large amplitude, the protection function has a definite time characteristic: b if I > 20 Is, tripping time is the time that corresponds to 20 Is b if I > 40 In, tripping time is the time that corresponds to 40 In. (In: current transformer rated current defined when the general settings are made).

MT10533

t

Block diagram DE50371

T

Is Definite time protection principle.

I

Timer hold delay IDMT protection IDMT protection operates in accordance with the IEC (60255-3), BS 142 and IEEE (C-37112) standards.

The function includes an adjustable timer hold delay T1: b definite time (timer hold) for all the tripping curves.

MT10541

I > Is time-delayed output MT10903

type 1 t type 1.2

I > Is pick-up signal

tripping

T

T

value of internal time delay counter 1

1.2

10

20

I/Is


T1

T1 T1

3/22




b IDMT for IEC, IEEE and IAC curves. MT10527

I > Is time-delayed output

I > Is pick-up signal

tripping

T value of internal time delay counter

3

T1

Characteristics Tripping curve Setting Is set point Setting

Definite time, IDMT: chosen according to list on previous page Definite time IDMT

Resolution Accuracy (1) Drop out/pick-up ratio Time delay T (operation time at 10 Is) Setting Definite time IDMT Resolution Accuracy (1) Definite time IDMT Timer hold delay T1 Definite time (timer hold) IDMT (reset time) (3) Characteristic times Operation time

0.1 In y Is y 24 In expressed in Amps 0.1 In y Is y 2.4 In expressed in Amps 1 A or 1 digit ±5 % 93.5 % ±5 % (with min. reset variance of 0.015 In) inst. 50 ms y T y 300 s 100 ms y T y 12.5 s or TMS (2) 10 ms or 1 digit ±2 % or from -10 ms to +25 ms Class 5 or from -10 ms to +25 ms 0; 0.05 to 300 s 0.5 to 20 s pick-up < 35 ms at 2 Is (typically 25 ms) inst. < 50 ms at 2 Is (confirmed instantaneous) (typically 35 ms) < 35 ms < 50 ms (for T1 = 0)

Overshoot time Reset time (1) In reference conditions (IEC 60255-6). (2) Setting ranges in TMS (Time Multiplier Setting) mode Inverse (SIT) and IEC SIT/A: 0.04 to 4.20 Very inverse (VIT) and IEC VIT/B: 0.07 to 8.33 Very inverse (LTI) and IEC LTI/B: 0.01 to 0.93 Ext inverse (EIT) and IEC EIT/C: 0.13 to 15.47 IEEE moderately inverse: 0.42 to 51.86 IEEE very inverse: 0.73 to 90.57 IEEE extremely inverse: 1.24 to 154.32 IAC inverse: 0.34 to 42.08 IAC very inverse: 0.61 to 75.75 IAC extremely inverse: 1.08 to 134.4 (3) Only for standardized tripping curves of the IEC, IEEE and IAC types.

3/23




Description

The Is0 setting is the vertical asymptote of the curve, and T is the operation time delay for 10 Is0. The tripping time for I0/Is0 values of less than 1.2 depends on the type of curve chosen.

The earth fault function comprises 4 independant elements divided into two groups of 2 settings called Group A and Group B respectively. The use of the two elements may be chosen by parameter setting: b operation with Group A or Group B exclusively, with switching from one group to the other dependent on the state of logic input I13 exclusively, or by remote control (TC3, TC4), I13 = 0 group A I13 = 1 group B b operation with Group A and Group B active for 4-set point operation b enabling/disabling of each group of 2 elements (A, B).

3

Name of curve Type Standard inverse time (SIT) 1.2 Very inverse time (VIT or LTI) 1.2 Extremely inverse time (EIT) 1.2 Ultra inverse time (UIT) 1.2 RI curve 1 IEC standard inverse time SIT / A 1 IEC very inverse time VIT or LTI / B 1 IEC extremely inverse time EIT / C 1 IEEE moderately inverse (IEC / D) 1 IEEE very inverse (IEC / E) 1 IEEE extremely inverse (IEC / F) 1 IAC inverse 1 IAC very inverse 1 IAC extremely inverse 1 The curve equations are given in the chapter entitled "IDMT protection functions".

Operation The earth fault protection function is single-pole. It picks up if the earth fault current reaches the operation set point. It is time-delayed. The time delay may be definite time (DT) or IDMT according to the curves opposite. The protection function includes harmonic 2 restraint which provides greater stability when transformers are energized (measurement of residual current by the sum of the 3 phase CTs). The restraint disables tripping, regardless of the fundamental current. The restraint may be inhibited by parameter setting. DE50372

Block diagram

DE50244

Definite time protection Is0 is the operation set point expressed in Amps, and T is the protection operation time delay.

The function takes into current variations during the time delay interval. For currents with a very large amplitude, the protection function has a definite time characteristic: b if I0 > 20 Is0, tripping time is the time that corresponds to 20 Is0 b if I0 > 15 In0 (1), tripping time is the time that corresponds to 15 In0.

Timer hold delay

Definite time protection principle.

DE50246

IDMT protection IDMT protection operates in accordance with the IEC (60255-3), BS 142 and IEEE (C-37112) standards.


3/24

DE50247

The function includes an adjustable timer hold delay T1: b definite time (timer hold) for all the tripping curves




DE50248

b IDMT for IEC, IEEE and IAC curves.

3 Characteristics Tripping curvet Setting

(1) In0 = In if the sum of the three phase currents is used for the measurement. In0 = sensor rating if the measurement is taken by a CSH core balance CT. In0 = In of the CT if the measurement is taken by a 1 A or 5 A current transformer. (2) In reference conditions (IEC 60255-6). (3) Setting ranges in TMS (Time Multiplier Setting) mode Inverse (SIT) and IECIEC SIT/A: 0.04 to 4.20 Very inverse (VIT) and IEC VIT/B: 0.07 to 8.33 Very inverse (LTI) and IEC LTI/B: 0.01 to 0.93 Ext inverse (EIT) and IEC EIT/C: 0.13 to 15.47 IEEE moderately inverse: 0.42 to 51.86 IEEE very inverse: 0.73 to 90.57 IEEE extremely inverse: 1.24 to 154.32 IAC inverse: 0.34 to 42.08 IAC very inverse: 0.61 to 75.75 IAC extremely inverse: 1.08 to 134.4 (4) Only for standardized tripping curves of the IEC, IEEE and IAC types.

Is0 set point Definite time setting Sum of CTs (1) With CSH sensor 2 A rating 20 A rating CT + CSH30 Core balance CT with ACE990 IDMT time setting Sum of CTs (1) With CSH sensor 2 A rating 20 A rating CT + CSH30 Core balance CT with ACE990 Resolution Accuracy (2) Drop out/pick-up ratio Harmonic 2 restraint Fixed threshold Time delay T (operation time at 10 Is0) Setting Definite time IDMT (3) Resolution Definite time Accuracy (2) IDMT Timer hold delay T1 Definite time (timer hold) IDMT (4) Characteristic times Operation time

Overshoot time Reset time

Definite time, IDMT: chosen according to list on previous page 0.1 In0 y Is0 y 15 In0 expressed in Amps 0.1 In0 y Is0 y 15 In0 0.2 A to 30 A 2 A to 300 A 0.1 In0 y Is0 y 15 In0 (min. 0.1 A) 0.1 In0 < Is0 < 15 In0 0.1 In0 y Is0 y In0 (1) expressed in Amps 0.1 In0 y Is0 y In0 0.2 A to 2 A 2 A to 20 A 0.1 In0 y Is0 y In0 (min. 0.1 A) 0.1 In0 y Is0 y In0 0.1 A or 1 digit ±5 % 93.5 % ±5 % for Is0 > 0.1 In0 17 % inst. 50 ms y T y 300 s 100 ms y T y 12.5 s or TMS (3) 10 ms or 1 digit ±2 % or from -10 ms to +25 ms class 5 or from -10 ms to +25 ms

0; 0.05 to 300 s 0.5 to 300 s pick-up < 35 ms at 2 Is0 (typically 25 ms) inst. < 50 ms at 2 Is0 (confirmed instantaneous) (typically 35 ms) < 35 ms < 40 ms (for T1 = 0)

3/25


Phase-to-phase overvoltage ANSI code 59


Operation This protection is three-phase: b it picks up when one of the phase-to-phase voltages concerned is greater than the Us set point b the protection includes a definite time delay.

MT10876

Block diagram U21 U32

T

0

time-delayed output

U > Us

U13

“pick-up” signal

Characteristics

3

Us set point Setting

50 % Unp to 150 % Unp (2)

Accuracy (1)

±2 % or 0.005 Unp

Resolution

1%


97 % ±1 %


50 ms to 300 s

Accuracy (1)

±2 %, or ±25 ms

Resolution

10 ms or 1 digit



Overshoot time

< 35 ms

Reset time

< 40 ms

(1) In reference conditions (IEC 60255-6). (2) 135 % Unp with TP 230 V / 3.

3/26


Neutral voltage displacement ANSI code 59N


Operation The protection function picks up if the residual voltage V0 is above a Vs0 set point, with V0 = V1 + V2 + V3 , b it includes a definite time delay T b the residual voltage is either calculated from the 3 phase voltages or measured by an external VT.

DE50249

Block diagram

3

Characteristics Vs0 set point Setting

Accuracy (1) Resolution Drop-out/pick-up ratio Time delay T Setting Accuracy (1) Resolution Characteristic times Operation time Overshoot time Reset time (1) In reference conditions (IEC 60255-6). (2) Vns0 is one of the general settings.

2 % Unp to 80 % Unp if Vns0 (2) = sum of 3Vs 2 % Unp to 80 % Unp if Vns0 (2) = Uns/3 5 % Unp to 80 % Unp if Vns0 (2) = Uns/3 ±2 % or ±0.005 Unp 1% 97 % ±1 % 50 ms to 300 s ±2 %, or ±25 ms 10 ms or 1 digit pick-up < 55 ms < 35 ms < 55 ms

3/27


Starts per hour ANSI code 66


Operation This function is three-phase. It picks up when the number of starts reaches the following limits: b maximum number of starts allowed per period of time (P) (Nt) b maximum allowed number of consecutive hot starts (Nh) b maximum allowed number of consecutive cold starts (Nc). The function indicates: b the number of starts still allowed before the maximum, if the protection has not picked up. The number of starts depends on the motor’s thermal state b waiting time before a start is allowed, if the protection has picked up. Starting is detected when the current consumed becomes greater than 10 % of the Ib current. information The following information is available for the : b the waiting time before a start is allowed b the number of starts still allowed. See chapter "Machine operation assistance functions".

3

The number of consecutive starts is the number starts counted during the last P/Nt minutes, Nt being the number of starts allowed per period. The motor hot state corresponds to the overshooting of the fixed set point (50 % heat rise) of the thermal overload function. When the motor re-accelerates, it undergoes a stress similar to that of starting without the current first ing through a value less than 10 % of Ib, in which case the number of starts is not incremented. It is possible however to increment the number of starts when a re-acceleration occurs by a logic data input (input I22).

MT10871

Block diagram

I1 I2 I3

k1 > Nt

& I > 0.1Ib

0

T

P mn ≥1

≥1

input I22

k2 > Nc P mn/Nt

& thermal alarm (hot state)

k3 > Nh P mn/Nt

"Clear"

Characteristics Period of time (P) Setting Resolution Nt total number of starts Setting Resolution Nh and Nc number of consecutive starts Setting (1) Resolution T time delay between starts Setting Resolution (1) With Nc y Nf.

3/28

1 to 6 hour 1 1 to 60 1 1 to Nt 1 0 mn y T y 90 mn 1 mn or 1 digit

inhibit closing




Operation Initialization of the recloser The recloser is ready to operate if all of the following conditions are met: b "CB control" function activated and recloser in service b circuit breaker closed b inhibition time delay not running b none of the recloser inhibition conditions is true (see further on). Recloser cycles b case of a cleared fault: v following a reclosing order, if the fault does not appear after the memory time delay has run out, the recloser reinitializes and a message appears on the display (see example 1) b case of a fault that is not cleared: v following instantaneous or time-delayed tripping by the protection unit, activation of the isolation time delay associated with the first active cycle. At the end of the time delay, a closing order is given, which activates the memory time delay. If the protection unit detects the fault before the end of the time delay, a tripping order is given and the following reclosing cycle is activated. v after all the active cycles have been run, if the fault still persists, a final trip order is given, a message appears on the display and closing is locked out until acknowledgment takes place, according to the parameter setting of the protection function b closing on a fault. If the circuit breaker closes on a fault, or if the fault appears before the end of the lockout time delay, the recloser is inhibited. Recloser inhibition conditions The recloser is inhibited according to the following conditions: b voluntary open or close order b recloser put out of service b receipt of a lockout order on the lockout logic input I26 b appearance of a switchgear-related fault, such as trip circuit fault, or unexecture control order fault b opening of the circuit breaker by external tripping via inputs I21, I22 or I23.

Characteristics Reclosing cycles Number of cycles Activation of cycle 1 (1)

overcurrent 1 overcurrent 2 earth fault 1 earth fault 2 overcurrent 1 overcurrent 2 earth fault 1 earth fault 2

Activation of cycles 2, 3 and 4 (1)

Setting 1 to 4 inst. / delayed / inactive inst. / delayed / inactive inst. / delayed / inactive inst. / delayed / inactive inst. / delayed / inactive inst. / delayed / inactive inst. / delayed / inactive inst. / delayed / inactive

Time delays Memory time delay Isolation time delay

cycle 1 cycle 2 cycle 3 cycle 4

0.05 to 300 s 0.05 to 300 s 0.05 to 300 s 0.05 to 300 s 0.05 to 300 s 0.05 to 300 s

Lockout time delay Accuracy ±2 % or 25 ms Resolution 10 ms or 1 digit (1) If a protection function that is inactive in relation to the recloser leads to circuit breaker opening, the recloser is inhibited.

3/29

3




MT10879

Example 1: case of successful reclosing after the first cycle. Activation with 300 ms time-delayed O/C protection

Instantaneous O/C 300 ms Time-delayed O/C

I12 (closed position) inhibition time delay CB open command

3

I11 (open position)

cycle 1 isolation time delay disengagement time delay

CB close command

Reclosing in progress (TS35) “cleared fault” message

Reclosing successful (TS37)

MT10880

Example 2: case of definitive tripping after two cycles activated by 300 ms time-delayed O/C protection Instantaneous O/C 300 ms

300 ms

300 ms

Time-delayed O/C

I12 (closed position)

inhibition time delay

CB open command

I11 (open position)

cycle 1 isolation time delay

cycle 2 isolation time delay

CB close command

Reclosing in progress (TS35) Definitive tripping (TS37)

3/30

“permanent fault” message


Overfrequency ANSI code 81H


Operation The protection function picks up when the positive sequence voltage frequency is above the set point and the positive sequence voltage is more than 20 % of Vnp (Unp/3). If a single VT is connected (U21), the function picks up when the frequency is higher than the set point and the U21 voltage is more than 20 % of Unp. It includes a definite time delay T.

MT10542

Block diagram U32

Vd

U21

&

F > Fs

T

0

time-delayed output

“pick-up” signal Vd > 0.2 Vnp

(1)

3

(1) or U21 > 0.2 Unp if only one VT.

If there is only one sensor (U21), the voltage signal is connected to terminals 1 and 2 of the connector CCT640, whatever the phase.

Characteristics Fs set points Setting Resolution

50 to 53 Hz or 60 to 63 Hz 0.1 Hz

Accuracy (1)

±0.1 Hz

Pick-up / drop-out difference

0.2 Hz ±0.1 Hz


100 ms to 300 s

Accuracy (1)

±2 % or ±25 ms

Resolution

10 ms or 1 digit

Characteristic times (1) Operation time


Overshoot time

< 100 ms

Reset time

< 100 ms

(1) In reference conditions (IEC 60255-6) and df/dt < 3 Hz/s.

3/31


Underfrequency ANSI code 81L


Operation The function picks up when the positive sequence voltage frequency is below the set point and if the negative sequence voltage is more than 20 % of Vnp (Unp 3). If a single VT is connected (U21), the function picks up when the frequency is below the set point and the U21 voltage is more than 20 % of Unp. It includes a definite time delay T.

Block diagram MT10543

U32

Vd

U21

&

F < Fs

T

0

time-delayed output

“pick-up” sortie Vd > 0.2 Vnp

3

(1)

(1) Or U21 > 0.2 Unp if only one VT.

If there is only one sensor (U21), the voltage signal is connected to terminals 1 and 2 of the connector CCT640, whatever the phase.

Characteristics Fs set points Setting

45 to 50 Hz or 55 to 60 Hz

Resolution

0.1 Hz

Accuracy (1)

±0.1 Hz

Pick-up / drop-out difference

0.2 Hz ±0.1 Hz


100 ms to 300 s

Accuracy (1)

±2 % or ±25 ms

Resolution

10 ms or 1 digit



Overshoot time

< 100 ms

Reset time

< 100 ms

(1) In reference conditions (IEC 60255-6) and df/dt < 3 Hz/s.

3/32


Rate of change of frequency ANSI code 81R


Operation This function picks up when the rate of change of frequency (ROCOF) of the positive sequence voltage overshoots the set point. If only one VT is connected (U21), the function is inhibited. It includes a definite time delay T.

MT10877

Block diagram > + dFs/dt

< Fmax Vd

f > Fmin

&

dF/dt

1

T

0

time delayed output signal “pick-up”

> 0.5 Vn

< - dFs/dt

3 Characteristics dFs/dt set point Setting Resolution Accuracy

0.1 to 10 Hz/s 0.1 Hz/s tripping

±5 % or ±0.1 Hz/s

no tripping

±3 % or ±0.05 Hz/s


100 ms to 300 s

Accuracy

±2 % or ±25 ms

Resolution

10 ms or 1 digit


pick-up < 170 ms (130 ms typical)

Overshoot time

< 100 ms

Reset time

< 100 ms


3/33




General

The time delay setting that should be made in order for the operation curve to through the point k (Ik, tk) is:

These 3 settings are made chronologically in the following order: type, Is current, time delay T. Changing the time delay T setting by x % changes all of the operation times in the curve by x %.

Examples of problems to be solved Problem 1 Knowing the type of IDMT, determine the Is current and time delay T settings. Theoretically, the current setting Is corresponds to the maximum current that may be permanent: it is generally the rated current of the protected equipment (cable, transformer). The time delay T is set to the operation point at 10 Is on the curve. This setting is determined taking into the constraints involved in discrimination with the upstream and downstream protection devices. The discrimination constraint leads to the definition of point A on the operation curve (IA, tA), e.g. the point that corresponds to the maximum fault current affecting the downstream protection device. Problem 2 Knowing the type of IDMT, the current setting Is and a point k (Ik, tk) on the operation curve, determine the time delay setting T. On the standard curve of the same type, read the operation time tsk that corresponds to the relative current lk ----ls and the operation time Ts10 that corresponds to the relative current I ----- = 10 Is

tk

k

tsk Ts10

1

Ik/Is

10

I/Is

Another practical method: The table on the next page gives the values of ts I K = ------------ as a function of ----ts10 Is tsk In the column that corresponds to the type of time delay, read the value K = -------------Ts10 Ik in the line for ----Is The time delay setting to be used so that the operation curve es through the tk point k (Ik, tk) is: T = ----k Example Data: type of time delay: standard inverse time (SIT) set point: Is a point k on the operation curve: k (3.5 Is; 4 s) Question: What is the time delay T setting (operation time at 10 Is)? Reading of the table: SIT column I line ----- = 3, 5 Is K = 1.86 4 Answer: The time delay setting is T = ------------- = 2, 15s 1, 86 Problem 3 Knowing the current Is and time delay T settings for a type of time delay (standard inverse, very inverse, extremely inverse), find the operation time for a current value of IA. On the standard curve of the same type, read the operation time tsA that corresponds to the relative current IA -----Is

I and the operation time Ts10 that corresponds to the relative current ----- = 10 Is The operation time tA for the current IA with the Is and T settings is T tA = tsA × -------------Ts10 ts MT10538

3

ts

tk T = Ts10 × --------tsk

MT10537

Operation time depends on the type of protection (phase current, earth fault current, …). Operation is represented by a characteristic curve: b t = f(I) curve for the phase overcurrent function b t = f(I0) curve for the earth fault function. The rest of the document is based on t = f(I); the reasoning may be extended to other variables I0,… The curve is defined by: b type (standard inverse, very inverse, extremely inverse...) b current setting Is which corresponds to the vertical asymptote of the curve b time delay T which corresponds to the operation time for I = 10 Is.

tA T tsA Ts10

1

3/34

IA/Is

10

I/Is




Another practical method: the table below gives the values of ts I K = -------------- as a function of ----Ts10 Is

Example Data: b type of time delay: very inverse time (VIT) b set point: Is b time delay T = 0.8 s. Question: What is the operation time for the current IA = 6 Is? Reading of the table: VIT column

In the column that corresponds to the type tsA of time delay, read the value K = -------------Ts10 IA on the line for -----Is

I line ----- = 6 Is

The operation time tA for the current IA with the Is and T settings is tA = K. T

Answer: The operation time for the current IA is t = 1.80 x 0.8 = 1.44 s.

Table of values of K I/Is

SIT VIT, LTI EIT and IEC/A and IEC/B and IEC/C 1.0 — — — 90.000 (1) 471.429 (1) 1.1 24.700 (1) 1.2 12.901 45.000 225.000 1.5 5.788 18.000 79.200 2.0 3.376 9.000 33.000 2.5 2.548 6.000 18.857 3.0 2.121 4.500 12.375 3.5 1.858 3.600 8.800 4.0 1.676 3.000 6.600 4.5 1.543 2.571 5.143 5.0 1.441 2.250 4.125 5.5 1.359 2.000 3.385 6.0 1.292 1.800 2.829 6.5 1.236 1.636 2.400 7.0 1.188 1.500 2.063 7.5 1.146 1.385 1.792 8.0 1.110 1.286 1.571 8.5 1.078 1.200 1.390 9.0 1.049 1.125 1.238 9.5 1.023 1.059 1.109 10.0 1.000 1.000 1.000 10.5 0.979 0.947 0.906 11.0 0.959 0.900 0.825 11.5 0.941 0.857 0.754 12.0 0.925 0.818 0.692 12.5 0.910 0.783 0.638 13.0 0.895 0.750 0.589 13.5 0.882 0.720 0.546 14.0 0.870 0.692 0.508 14.5 0.858 0.667 0.473 15.0 0.847 0.643 0.442 15.5 0.836 0.621 0.414 16.0 0.827 0.600 0.388 16.5 0.817 0.581 0.365 17.0 0.808 0.563 0.344 17.5 0.800 0.545 0.324 18.0 0.792 0.529 0.307 18.5 0.784 0.514 0.290 19.0 0.777 0.500 0.275 19.5 0.770 0.486 0.261 20.0 0.763 0.474 0.248 (1) Values only suitable for IEC A, B and C curves.

UIT

RI

— — 545.905 179.548 67.691 35.490 21.608 14.382 10.169 7.513 5.742 4.507 3.616 2.954 2.450 2.060 1.751 1.504 1.303 1.137 1.000 0.885 0.787 0.704 0.633 0.572 0.518 0.471 0.430 0.394 0.362 0.334 0.308 0.285 0.265 0.246 0.229 0.214 0.200 0.188 0.176

3.062 2.534 2.216 1.736 1.427 1.290 1.212 1.161 1.126 1.101 1.081 1.065 1.053 1.042 1.033 1.026 1.019 1.013 1.008 1.004 1.000 0.996 0.993 0.990 0.988 0.985 0.983 0.981 0.979 0.977 0.976 0.974 0.973 0.971 0.970 0.969 0.968 0.967 0.966 0.965 0.964

IEEE MI (IEC/D) — 22.461 11.777 5.336 3.152 2.402 2.016 1.777 1.613 1.492 1.399 1.325 1.264 1.213 1.170 1.132 1.099 1.070 1.044 1.021 1.000 0.981 0.963 0.947 0.932 0.918 0.905 0.893 0.882 0.871 0.861 0.852 0.843 0.834 0.826 0.819 0.812 0.805 0.798 0.792 0.786

IEEE VI (IEC/E) — 136.228 65.390 23.479 10.199 6.133 4.270 3.242 2.610 2.191 1.898 1.686 1.526 1.402 1.305 1.228 1.164 1.112 1.068 1.031 1.000 0.973 0.950 0.929 0.912 0.896 0.882 0.870 0.858 0.849 0.840 0.831 0.824 0.817 0.811 0.806 0.801 0.796 0.792 0.788 0.784

IEEE EI (IEC/F) — 330.606 157.946 55.791 23.421 13.512 8.970 6.465 4.924 3.903 3.190 2.671 2.281 1.981 1.744 1.555 1.400 1.273 1.166 1.077 1.000 0.934 0.877 0.828 0.784 0.746 0.712 0.682 0.655 0.631 0.609 0.589 0.571 0.555 0.540 0.527 0.514 0.503 0.492 0.482 0.473

IAC I

IAC VI

IAC EI

62.005 19.033 9.413 3.891 2.524 2.056 1.792 1.617 1.491 1.396 1.321 1.261 1.211 1.170 1.135 1.105 1.078 1.055 1.035 1.016 1.000 0.985 0.972 0.960 0.949 0.938 0.929 0.920 0.912 0.905 0.898 0.891 0.885 0.879 0.874 0.869 0.864 0.860 0.855 0.851 0.848

62.272 45.678 34.628 17.539 7.932 4.676 3.249 2.509 2.076 1.800 1.610 1.473 1.370 1.289 1.224 1.171 1.126 1.087 1.054 1.026 1.000 0.977 0.957 0.939 0.922 0.907 0.893 0.880 0.868 0.857 0.846 0.837 0.828 0.819 0.811 0.804 0.797 0.790 0.784 0.778 0.772

200.226 122.172 82.899 36.687 16.178 9.566 6.541 4.872 3.839 3.146 2.653 2.288 2.007 1.786 1.607 1.460 1.337 1.233 1.144 1.067 1.000 0.941 0.888 0.841 0.799 0.761 0.727 0.695 0.667 0.641 0.616 0.594 0.573 0.554 0.536 0.519 0.504 0.489 0.475 0.463 0.450

3/35

3




Standard inverse time SIT curve

Extremely inverse time EIT curve

Very inverse time VIT or LTI curve

Ultra inverse time UIT curve t (s) 1 000.00 MT10540

MT10539

t (s) 100.00

100.00

10.00

curve (T = 1s)

curve (T = 1s)

3

10.00

1.00

RI inverse time SIT 1.00

very inverse time VIT or LTI

extremely inverse EIT ultra inverse UIT I/Is

I/Is

0.10

0.10 1

10

1

100

100

IAC curves t (s) 1 000.00

t (s) 10000.00

MT10529

MT10528

IEEE curves

10

1000.00 100.00

I VI

100.00

EI

MI VI

10.00

EI

10.00

1.00

1.00

I/Is

0.10

I/Is 1

3/36

10

100

0.10 1

10

100




Curve equations IEC curve, inverse type T k - × --t d ( I ) = ---------------------β I α  ---- –1  Is IEC curve, RI type T 1 t d ( I ) = ------------------------------------------------------ × ------------------I  – 1 3, 1706  0, 339 – 0,236  ---- Is IEEE curve     T A  t d ( I ) = ----------------------- + B × -- I P  β   ---- – 1    I s 

Characteristic curves IEC standard inverse / A IEC very inverse / B IEC long time inverse / B IEC extremely inverse / C IEC ultra inverse

k 0.14 13.5 120 80 315.2

Characteristic curves IEEE moderately inverse IEEE very inverse IEEE extremely inverse

A 0.010 3.922 5.64

B 0.023 0.098 0.0243

β 2.97 1.50 13.33 0.808 1

β 0.241 0.138 0.081

p 0.02 2 2

3

IAC curve

Characteristic curves

    T B D E t d ( I ) = A + -------------------- + ----------------------2- + ----------------------3- x ----β I I I  ---     - – C - – C   Is- – C ------Is Is ts

α 0.02 1 1 2 2.5

IAC inverse IAC very inverse IAC extremely inverse

A

B

C

D

E

β

0.208 0.090 0.004

0.863 0.795 0.638

0.800 0.100 0.620

-0.418 -1.288 1.787

0.195 7.958 0.246

0.297 0.165 0.092

TMS multiplying factor The time delay of IDMT tripping curves (except for RI curve) may be set: b either by T sec (operation time at 10 x Is) T b or by TMS (factor that corresponds to --- in the equations above). β

MT10530

IEC curve VIT type

TMS = 1

Example : 13, 5 T t ( I ) = -------------------- × TMS with: TMS = --------1 ,5 I  ----- – 1  Is

T = 1.5 sec

The IEC curve of the VIT type is positioned so as to be the same with TMS = 1 or T = 1.5 sec. 10

I/Is

Timer hold delay T1 b definite time: enables the function to be activated with intermittent faults b IDMT: makes it possible to emulate an electromagnetic disk protection relay.

Example: TMS multiplying factor.

MT10531

tr

T1 T t r ( I ) = ----------------------2 × --- with : T --- = TMS β β I 1 –  -----  Is

TMS = 1

T1

0

1

Example: IDMT timer hold delay T1.

I/Is

T1 = timer hold delay setting (timer hold delay for I reset = 0 and TMS = 1) T = tripping time delay setting (at 10 Is) k β = basic tripping curve value at 10 Is = ------------------α 10 – 1 The standardized or estimated values of T1 are available in the SFT2841 software help.

3/37


3

3/38

PCRED301005EN_4-Control_2004TDM.fm Page 1 Vendredi, 23. juillet 2004 4:03 16


Contents

Description

4/2

Definition of symbols

4/3

Assignment of logic inputs / outputs

4/4

Circuit breaker / or control

4/5

Logic discrimination

4/8

Disturbance recording triggering Switching of groups of settings

4/10

Indications

4/11

Control matrix

4/13

4

23 juillet 2004

4/1

PCRED301005EN_4-Control_2004.FM Page 2 Vendredi, 23. juillet 2004 2:47 14


Description

Sepam performs the control and monitoring functions required for electrical network operation.

Predefined functions The main control and monitoring functions are predefined and fit the most frequent cases of use. They are ready to use and are implemented by simple parameter setting after the necessary logic inputs / outputs are assigned. The predefined control and monitoring functions can be adapted for particular needs by customization of the control matrix using the SFT2841 software.

Control matrix The control matrix is a simple way to assign data from: b protection functions b predefined control and monitoring functions b logic inputs to the following output data: b output relays b 9 LEDs on the front of Sepam b triggering of disturbance recording.

Operating principle The processing of each control and monitoring function may be broken down into 3 phases: b acquisition of input data: v results of protection function processing v external logic data, connected to the logic inputs of an optional MES114 input / output module v remote control orders (TC) received via the Modbus communication link b actual processing of the control and monitoring function b utilization of the processing results: v activation of output relays to control an actuator v information sent to the facility manager: - by message and/or LED on the Sepam display and SFT2841 software - by remote indication (TS) via the Modbus communication link

DE51156

4

4/2


Definition of symbols


Pulse mode operation b "on" pulse: used to create a short-duration pulse (1 cycle) each time a signal appears DE50681

The symbols used in the different block diagrams describing the control and monitoring functions are defined on this page. Logic functions

DE50675

b "OR"

Equation: S = X + Y + Z. b "off" pulse: used to create a short-duration pulse (1 cycle) each time a signal disappears. DE50682

DE50676

b "AND"

Equation: S = X x Y x Z. b exclusive "XOR" DE50677

4 Nota : the disappearance of a signal may be caused by an auxiliary power failure.

S = 1 if one and only one input is set to 1 (S = 1 if X + Y + Z = 1).

Bistable functions

DE50678

DE50683

Bistable functions may be used to store values. b Complement These functions may use the complement of one or more input values.

Equation: S = X (S = 1 if X = 0).

Delay timers Two types of delay timers: b "on" delay timer: used to delay the appearance of a signal by a time T DE50679

Equation: B = S + R x B.

DE50680

b "off" delay timer: used to delay the disappearance of a signal by a time T.

4/3



Assignment of logic inputs / outputs

The use of the preset control and monitoring functions requires exclusive parameter setting and particular wiring of the inputs according to their application and the type of Sepam. The advanced UMI or the SFT2841 software may be used to assign inputs and set the control and monitoring function parameters. Since an input may only be assigned to a single function, not all the functions are available at the same time. Example: if the logic discrimination function is used, the switching of groups of settings function may not be used.

Assignment by application chart Functions Logic inputs Open position

S20

T20

M20

B21 - B22

Assignment

b b b b b b b b b

b b b b b b b (2) b b (3)

b b

b b

I11

External tripping 3 (1) Buchholz alarm (1) (Buchholz alarm message) Rotor rotation detection Thermistor tripping (1)

b

b (4) b

End of charging position Thermostat alarm (1) (thermostat alarm message) Thermistor alarm (1)

b

Inhibit remote control (1) SF6-1

b b b

Closed position Logic discrimination, receive BL Switching of groups of settings A/B External reset External tripping 4 (1) External tripping 1 (1) External network synchronization

4

External tripping 2 (1) Motor reacceleration

SF6-2 Change of thermal settings Inhibit thermal overload Inhibit recloser Logic outputs Tripping Inhibit closing Watchdog Closing order

b b b b b b b b b

I12 I13

b b b b b b b b

b b b b b

I14

b

I23

b b b b b b b b b

I21 I22

I24

b b b

I25

b b b b

O1

I26

b b b b b

b b b b

b b b b

O2 O4 O11

Note: all of the logic inputs are available via the communication link and are accessible in the SFT2841 control matrix for other non predefined applications. (1) These inputs have parameter setting with the prefix "NEG" for undervoltage type operation. (2) Buchholz/Gas trip message. (3) Thermostat trip message. (4) Pressure trip message.

4/4



Circuit breaker / or control ANSI code 94/69

Description Sepam may be used to control breaking devices equipped with different types of closing and tripping coils. b circuit breaker with shut trip or undervoltage tripping coil (parameter set on the front of the advanced UMI or in SFT2841) b latching or with shunt trip coil. Two breaking device control modes are available: b use of operating mechanism integrated in the circuit breaker / or This logical function processes all the circuit breaker closing and tripping conditions based on: v breaking device status information v remote control orders v protection functions v specific program logic for each application (e.g. recloser) v etc. This function also inhibits closing of the breaking device according to the operating conditions. b use of customized program logic A control and monitoring resource assignment matrix may be used to create customized program logic.

Operating mechanism integrated in the circuit breaker / or For operation in accordance with the block diagram, the Sepam must have the logic inputs required (an MES114 module must therefore be included) and the related parameter setting and wiring must be done. Remote tripping Circuit breaker / or tripping may be controlled remotely via the communication link. The circuit breaker / or tripping order may be activated at any time and is not inhibited by logic input I25. Circuit breaker / or closing orders and Sepam acknowledgment via the communication link may be inhibited by logic input I25.

Circuit breaker / or control with lockout function (ANSI 86) The ANSI 86 function traditionally performed by lockout relays may be carried out by Sepam using the predefined Circuit breaker / or control function, with latching of all tripping conditions (protection function outputs and logic inputs). With this function, Sepam performs the following: b grouping of all tripping conditions and breaking device control b latching of the tripping order with inhibition of closing until the cause of tripping disappears and is acknowledged by the (see "Latching / acknowledgment") b indication of the cause of tripping: v locally by signal lamps ("Trip" and others) and by messages on the display v remotely by remote indications.

4/5

4



Circuit breaker / or control ANSI code 94/69

DE50373

Block diagram (1): Sepam S20, T20 or M20

4

DE50374

Block diagram (1): Sepam B21 (3) or B22

(1) Data used in the logic block diagram depend on the Sepam type, availability of MES114 option and general parameters. (2) The usual case in which O2 is set to “undervoltage coil” (normaly closed). (3) Performs B20 type functions.

4/6


Circuit breaker / or control


Latching / acknowledgment MT10188

The tripping outputs of all the protection functions and all the logic inputs may be latched individually. Logic outputs may not be latched. The logic outputs set up in pulse mode maintain pulse-type operation, even when linked to latched data. Latched data are saved in the event of a power failure. All latched data may be acknowledged locally on the UMI, or remotely by means of a logic input or via the communication link. The "Latching / acknowledgment" function associated with the "Circuit breaker / or control" function may be used to perform the ANSI 86 "lockout relay" function.

TC/circuit breaker position discrepancy MT10189

This function detects a discrepancy between the last remote control order received and the actual position of the circuit breaker. The information is accessible via remote indication TS42.

MT10190

5

O1

Trip circuit supervision and open / closed matching

D

A

4 M

1

I11 2 4 5

I12

Wiring for shunt trip unit.

Block diagram (1) 5 4

M

+ _ D

MT10192

MT10191

A O1

4

Description This supervision is designed for trip circuits: b with shunt trip units The function detects: v circuit continuity v loss of supply v mismatching of position s. The function inhibits closing of the breaking device. b with undervoltage trip units The function detects mismatching of position s, coil supervision being unnecessary in this case. The information is accessible in the matrix and via the remote indication TS43.

+ _

1

I11 I12

2 4 5

Wiring for undervoltage trip unit.

(1) With MES option. The function is activated if inputs I11 and I12 are set respectively as circuit breaker "open position" and circuit breaker "closed position".

Open and close order supervision Following a circuit breaker open or close order, the system checks whether, after a 200 ms time delay, the circuit breaker has actually changed status. If the circuit breaker status does not match the last order sent, a "Control fault" message and remote indication TS45 are generated.

4/7



Logic discrimination ANSI code 68

Description

With this type of system, time delays are set in accordance with the device to be protected, without any concern for the discrimination aspect.

Operating principle sending of BI MT10195

This function provides: b full tripping discrimination b a substantial reduction in delayed tripping of the circuit breakers located nearest the source (drawback of the classical time-based discrimination process). The system applies to the definite time (DT) and IDMT phase overcurrent and earth fault protection functions.

MT10196

level "n+1" Sepam

O3

+ td : X+0.9s O3 output other level "n" Sepam

td : X+0.6s

level "n" Sepam

O3

td : X+0.3s

4

receipt of BI td : Xs

MT10197

e.g.: Radial distribution with use of time-based discrimination (td: tripping time definite time curves).

td : Xs MERLIN

GERIN

When a fault occurs in a radial network, the fault current flows through the circuit between the source and the location of the fault: b the protection units upstream from the fault are triggered b the protection units downstream from the fault are not triggered b only the first protection unit upstream from the fault should trip. Each Sepam is capable of sending and receiving blocking input orders except for motor Sepams (1) which can only send blocking input orders. When a Sepam is triggered by a fault current: b it sends a blocking input order to output O3 (2) b it trips the associated circuit breaker if it does not receive a blocking input order on the blocking input logic input (3). The sending of the blocking input lasts the time it takes to clear the fault. It is interrupted after a time delay that takes into the breaking device operating time and protection unit reset time. This system minimizes the duration of the fault, optimizes discrimination and guarantees safety in downgraded situations (wiring or switchgear failure).

td : Xs MERLIN

Pilote wire test

GERIN

The pilot wire test may be performed using the output relay test function.

td : Xs MERLIN

GERIN

BI order td : Xs MERLIN

GERIN

e.g.: radial distribution with use of the Sepam logic discrimination system.

4/8

(1) Motor Sepams are not affected by the receipt of a blocking input since they are designed for loads only. (2) Default parameter setting. (3) According to parameter setting and presence of an additional MES114 module.



Logic discrimination ANSI code 68

DE50375

Block diagram: Sepam S20 and T20

4 DE50376

Block diagram: Sepam M20

(1) According to parameter setting (O3 by default). (2) Instantaneous action (inst) corresponds to protection "pick-up" signal information.

4/9


Disturbance recording triggering Switching of groups of settings


Disturbance recording trigger Description The recording of analog and logic signals may be triggered by different events, according to control matrix parameter setting or by manual action: b triggering by the grouping of all pick-up signals of the protection functions in service b triggering by the delayed outputs of selected protection functions b triggering by selected logic inputs b manual triggering by a remote control order (TC10) b manual triggering via the SFT2841 software tool. Disturbance recording may be: b inhibited via the SFT2841 software or by remote control order (TC8) b validated via the SFT2841 software or by remote control order (TC9).

DE51139

Block diagram

4

Switching of groups of settings There are 4 relays for the phase overcurrent and earth fault protection functions, split into two groups of 2 relays, called group A and group B respectively. The use of the protection relays is determined by parameter setting. The switching of groups of settings function enables the group A or group B protection functions to be activated: b according to the status of logic input I13 v I13 = 0: activation of group A v I13 = 1: activation of group B b or via the communication link v TC3: activation of group A v TC4: activation of group B. The use of the switching of groups of settings functions does not exclude the use of the logic discrimination function.

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Indications ANSI code 30

Events may be indicated on the front of Sepam by: b appearance of a message on the display of the advanced UMI b lighting up of one of the 9 yellow signal lamps.

Message type indication Predefined messages All the messages connected to the standard Sepam functions are predefined and available in two language versions: b in English, factory messages, not modifiable b in the local language, according to the version delivered. The language version is chosen at the time of Sepam parameter setting. The messages are visible on the display units of Sepams equipped with the advanced UMI and in the SFT2841 Alarms screen. b the number and type of predefined messages depend on type of Sepam. The table below gives the complete list of all predefined messages.

List of messages (1) Functions Phase overcurrent Earth fault Thermal overload

English (factory) French PHASE FAULT DEFAUT PHASE EARTH FAULT DEFAUT TERRE THERMAL ALARM ECHAUFT. ALARME THERMAL TRIP ECHAUFT. DECLT. Negative sequence / unbalance UNBALANCE DESEQUILIBRE Locked rotor / ROTOR BLOCKING BLOCAGE ROTOR Locked rotor on start STRT LOCKED ROTR. BLOC ROTOR DEM Excessive starting time LONG START DEMARRAGE LONG Starts per hour START INHIBIT DEMARRAGE INHIBE Phase undercurrent UNDER CURRENT COURANT << Phase-to-phase overvoltage OVERVOLTAGE TENSION >> Phase-to-phase undervoltage UNDERVOLTAGE TENSION << Positive sequence undervoltage UNDERVOLTAGE TENSION << Phase-to-neutral undervoltage UNDERVOLT. V1 TENSION << V1 UNDERVOLT. V2 TENSION << V2 UNDERVOLT. V3 TENSION << V3 Neutral voltage displacement Vo FAULT DEFAUT Vo Overfrequency OVER FREQ. FREQUENCE >> Underfrequency UNDER FREQ. FREQUENCE << Rate of change of frequency ROCOF DERIV. FREQ. Temperature monitoring (2) OVER TEMP. ALM T° ALARME OVER TEMP. TRIP T°. DECLT. RTD’S FAULT DEFAUT SONDES Thermostat (3) THERMOST. ALARM THERMOT. ALARME THERMOST. TRIP THERMOST. DECLT. BUCHHOLZ ALARM BUCHH ALARME Buchholz (3) BUCHH/GAS TRIP BUCHH/GAZ DECLT. PRESSURE TRIP PRESSION DECLT. Pressure (3) Thermistor PTC/NTC THERMIST. ALARM THERMIST. ALARME THERMIST. TRIP THERMIST. DECLT. Trip circuit supervision TRIP CIRCUIT CIRCUIT DECLT. Circuit breaker / or control CONTROL FAULT DEFAUT COMDE. Recloser PERMANENT FAULT DEFAUT PERMANT. Recloser CLEARED FAULT DEFAUT ELIMINE (1) According to type of Sepam and Sepam equipped with advanced UMI, or SFT2841. Messages by default, the wording of the messages may be changed (please consult us). (2) RTD fault message: refer to the maintenance chapter. (3) According to parameter setting logic input I21 to I24 (T20 type).

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4



Indications ANSI code 30

DE51148

Message processing on the advanced UMI display When an event occurs, the related message appears on the advanced UMI display. The presses the

clear

key to clear the message and be able to consult all the

advanced UMI screens in the normal fashion. reset

The must press the key to acknowledge latched events (e.g. protection outputs). The list of messages remains accessible in the alarm history ( key), in which the last 64 messages are stored. To delete the messages stored in the alarm history: b display the alarm history on the advanced UMI b press the

Alarm message on the advanced UMI.

clear

key.

Signal lamp type indication The 9 yellow signal lamps on the front of Sepam are assigned by default to the following events: Signal Event Label on lamp front

4

LED 1

Tripping of protection 50/51 unit 1

I>51

LED 2

Tripping of protection 50/51 unit 2

I>>51

LED 3

Tripping of protection 50N/51N unit 1

Io>51N

LED 4

Tripping of protection 50N/51N unit 2

Io>>51N

LED 5

Ext

LED 6 LED 7

Circuit breaker open (I11) (1)

LED 8

Circuit breaker closed (I12) (1)

I on

LED 9

Tripping by circuit breaker control

Trip

0 off

(1) Assignment by default with MES114.

The default parameter setting may be personalized using the SFT2841 software: b the assignment of signal lamps to events is to be defined in the control matrix screen b editing and printing of personalized labels are proposed in the "Sepam" menu.

4/12



Control matrix

E65575

The control matrix is used for simple assignment of the logic outputs and signal lamps to information produced by the protection units, program logic and logic inputs. Each column creates a logic OR between all the lines selected. The following data are managed in the control matrix and may be set using the SFT2841 software tool.

SFT2841: control matrix.

Data All of the application protection functions 79 - cleared fault 79 - permanent fault Logic inputs I11 to I14 and I21 to I26 BI transmission TCS CB control fault Sensor fault Pick-up Watchdog

Meaning Protection time-delayed output and additional outputs when applicable The recloser function has sucessfully reclosed The circuit breaker is definitively open after the reclosing cycles According to configuration Sending of the blocking information to the following Sepam in logic discrimination chain Trip circuit fault or mismatching of CB position s A circuit breaker open or close order has not been executed Hardware problem on an MET module or on an RTD Logical OR of the instantaneous output of all protection units Monitoring of Sepam operation

Comments Impulse type output Impulse type output

4

If MES114 module is configured O3 by default If the circuit breaker / or control function is activated

Always on O4 if used

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4

4/14

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