Micom - Technical Data

Technical Guide P12y/EN T04/A11

MiCOM P125/P126/P127

CHAPTER 4Technical Data and

Characteristic Curves

Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 1/40

CONTENTS

1. RATINGS 3

1.1 Power supply 3

1.2 Frequency 3

1.3 Current Inputs 3

1.4 Voltage Inputs 4

1.5 Logic inputs 4

1.6 Output relay contacts 4

2. HIGH VOLTAGE WITHSTAND 5

3. ELECTRICAL ENVIRONMENT 5

4. ENVIRONMENT 5

5. PROTECTION ACCURACY 6

6. AUTOMATION FUNCTIONS ACCURACY TIMERS 8

7. MEASUREMENT ACCURACY 8

8. PROTECTION SETTING RANGES 9

8.1 [67/50/51] Directional/non directional phase Overcurrent (P127 only) 9

8.1.1 Synchronous polarisation 9

8.1.2 Protection setting ranges (Only P127) 9

8.2 [50/51] Phase Overcurrent Protection (P126 Only) 10

8.2.1 Protection setting ranges (Only P126) 10

8.3 [67N/50N/51N] Neutral/Ground/Earth Directional/non Directional EarthOvercurrent Protection (P125, P126 & P127) 10

8.3.1 Protection setting ranges 11

8.4 Earth Wattmetric Protection (P125, P126 & P127) 13

8.5 Functionality mode 13


8.6 Undercurrent protection (P126 & P127 only) 15


8.7 Negative sequence overcurrent protection (P126 & P127 only) 15

8.7.1 Protection Setting Ranges 15

8.8 Thermal overload protection (P126 & P127 only) 15


P12y/EN T04/A11 Technical GuideCHAPTER 4 Technical DataPage 2/40 MiCOM P125/P126/P127

8.9 Under Voltage protection (P127 only) 16

8.9.1 Protection setting ranges (only P127) 16

8.10 Over Voltage protection (P127 only) 17

8.10.1 Protection setting ranges (only P127) 17

8.11 Residual Over Voltage protection (P125, P126 & P127) 18


8.12 Multishot Autorecloser function (P126 & P127) 18

8.12.1 Multishot Autorecloser settings 19

9. AUTOMATION CONTROL FUNCTIONS 20

9.1 Cold load pickup (P126 & P127) 20

9.2 Auxiliary timers (P126 & P127) 20

9.3 Broken conductor detection (P126 & P127) 20

9.3.1 Broken conductor detection setting ranges 20

9.4 Circuit breaker failure (P126 & P127) 20

9.4.1 CB Fail setting ranges 20

9.5 Trip circuit supervision (P126 & P127) 20

9.5.1 Trip circuit supervision setting ranges 20

9.6 Circuit breaker control and monitoring (P126 & P127) 21

9.6.1 Setting ranges 21

9.7 AND logic equation (P126 & P127) 21

9.7.1 Timer setting ranges 21

10. RECORDING FUNCTIONS (P126 & P127) 22

10.1 Event recorder 22

10.2 Fault recorder 22

10.3 Disturbance recorder 22

10.3.1 Triggers; Data; Setting Ranges 22

11. COMMUNICATION (P125, P126, P127) 23

12. CURVES 24

12.1 General 24

12.1.1 Inverse Time Curves : 24

12.1.2 Reset timer 25

12.2 IDMT Curves 26

12.2.1 IEC Curves 26

12.2.2 RI Curves 32

12.2.3 IEEE/ANSI CURVES 33

12.3 Thermal overload curves 39


1. RATINGS

1.1 Power supply

Power Supply range 24-60Vdc48-150Vdc130-250Vdc / 100-250Vac 50/60Hz

Power supply variations D.C. 20 %A.C. 20%, +10%

Ripple 12%

Power off withstand 50 ms

Burden P125 Stand by:


1.4 Voltage Inputs

Voltage input range 57 to 130V

Operating range 0 to 260V (measuring range)

Burden Resistive 44 kohm: 0.074W/57Veff0.38W/130Veff 1.54W/260Veff

Thermal Withstand

Continuous 260Vph - ph eff

10 seconds 300Vph - ph eff

Voltage input range 220 to 480V

Operating range 0 to 960V (measuring range)

Burden 438 kohm: 0.1102W/220Veff0.525W/480Veff2.1W/960Veff

Thermal Withstand

Continuous 960V ph-ph eff

10 seconds 1300V ph-ph eff

1.5 Logic inputs

Logic input type Independent optically insulated

Logic input burden 10 mA per input

Logic input recognition time


2. HIGH VOLTAGE WITHSTAND

Dielectric withstand IEC 60-255-5 2 kV common mode1 kV differential mode

Impulse voltage IEC 60-255-5 5 kV common mode1 kV differential mode

Insulation resistance IEC 60-255-5 > 1000 M

3. ELECTRICAL ENVIRONMENT

High frequency IEC 1000-4-1 2.5 kV common mode, class 3disturbance 1 kV differential mode, class 3

Fast transient IEC 1000-4-4 4 4 kV auxiliary voltage, class 4ANSI C37.90.1 2 kV others, class4

Electrostatic IEC 1000-4-2 8 kV, class 4discharge

Radio frequency ANSI C37.90.2 35 V/mimpulse IEC 1000-4-3 10 V/m

4. ENVIRONMENT

Temperature IEC 60-255-6 Storage -25C to +70COperation -25C to + 55 C

Humidity IEC 600-68-2-3 56 days at 93% RH and 40C

Enclosure protection IEC 60-529 IP 52, IK 07

Vibrations IEC 60-255-21-1 Response and endurance, class 2

Shocks and bumps IEC 60-255-21-11 Response and withstand, class 1

Seismic IEC 60-255-21-3 Class 1


5. PROTECTION ACCURACY

Glossary

I : Phase current

Is : I>, I>> & I>>>

I2s : I2>, I2>> & I2>>>

Ies : Ie>, Ie>> & Ie>>>

Iescos : Iecos> & Iecos>>

Pe : Earth fault Power

Pes : Pe> & Pe>>

Us : U>, U>>, U>, Ue>>>, Ue>>>>

DT : Definite time

IDMT : Inverse time

Element Range Accuracy Trigger Reset Time accuracy

Phase OvercurrentelementsI> & I>> & I>>>

0.1 to 40 In 2% DT: Is 2%IDMT: 1.1Is 2%

0.95 Is 2%1.05 Is 2%

2% +3050ms 5% +3050ms

Relay CharacteristicAngle (Torque angle)

0 to 359 2

Trip zone 10 to 170 2

Earth Fault OvercurrentelementsIe> & Ie>> & Ie>>>

0.002 to 1Ien0.01 to 8 Ien0.1 to 40 Ien

2% DT: Ies 2%IDMT: 1.1Ies 2%

0.95 Ies 2%1.05 Ies 2%

2% +3050ms 5% +3050ms

Wattmetric Earth Faultelements

57 to 130V0.2 to 20W1 to 160W10 to 800W

4% erroron cos

DT: Pes accuracyIDMT: 1.1Pes accuracy

0.95 Pes accuracy1.05 Pes accuracy

2% +3050ms

5% +3050ms

Wattmetric Earth FaultelementsPe> & Pe>>

220 to 480V1 to 80W4 to 640W40 to 3200W

4% erroron cos

DT: Pes accuracyIDMT: 1.1Pes accuracy

0.95 Pes accuracy1.05 Pes accuracy

2% +3050ms

5% +3050ms

Active Earth faultovercurrent elements.Iecos> & Iecos>>

0.002 to 1Ien0.01 to 8 Ien0.1 to 40 Ien

2% erroron cos

DT: Iescos accuracyIDMT: 1.1 Iescos accuracy

0.95 Iescos accuracy1.05 Iescos accuracy

2% +3050ms

5% +3050ms

Negative SequencePhase OvercurrentelementsI2>, I2>> & I2>>>

0.1 to 40 In 2% DT: I2s 2%IDMT: 1.1I2s 2%

0.95 Is 2%1.05 Is 2%

2% +3050ms 5% +3050ms

Phase Undercurrentelement I, Alarm, Trip

0.10 to 3.2 In 3% DT: I> 3% 0.97 I>3% 2% +3050ms


Element Range Accuracy Trigger Reset Time accuracy

Over voltageU> & U>>

57 to 130V2 to 260V

2% DT: Us 2% 0.95 Is 2% 2% +2040ms

Over voltageU> & U>>

220 to 480V10 to 960V

2% DT: Us 2% 0.95 Is 2% 2% +2040ms

Under voltageU< & U>, Ue>>>,Ue>>>>

57 to 130V

1 to 260V1 to 260V

2% DT: Urs 2% 0.95 Urs 2% 2% +2040ms

Residual Over voltage(Direct Input)Ue>, Ue>>, Ue>>>,Ue>>>>

220 to 480V

4 to 960V5 to 960V

2% DT: Urs 2% 0.95 Urs 2% 2% +2040ms

Derived Residual OvervoltageUe>, Ue>>, Ue>>>,Ue>>>>

57 to 130V

1 to 260V1 to 260V

greater of 2%or 0.2V

DT: Urs 2% 0.95 Urs 2% 2% +2040ms

Derived Residual OvervoltageUe>, Ue>>, Ue>>>,Ue>>>>

220 to 480V

4 to 960V5 to 960V

greater of 2%or 1V

DT: Urs 2% 0.95 Urs 2% 2% +2040ms


6. AUTOMATION FUNCTIONS ACCURACY TIMERS

Recloser timers tDs, tR, tI 2% +1030ms

CB fail & CB monitoring timers 2% +1030ms

Auxiliary timers t_AUX1 & t_AUX2 2% +1030ms

Cold load Pick Up 2% +2040ms

Programmable AND logic 2% +1030ms

7. MEASUREMENT ACCURACY

Measurement Range Accuracy

Phase Current 0.1 to 40 In Typical 0.5% at In

0.002 to 11Ien Typical 0.5% at Ien

0.01 to 8 Ien Typical 0.5% at Ien

Earth current

0.1 to 40 Ien Typical 0.5% at Ien

57 to 260V Typical 0.5% at UnVoltage

220 to 960V Typical 0.5% at Un

Active Power and Active Energy Reactive Power and Reactive Energy

Cos Accuracy Sin Accuracy

0.866 < 1.5% 0.866 < 3%

0.5 < 3% 0.5 < 1.5%


8. PROTECTION SETTING RANGES

8.1 [67/50/51] Directional/non directional phase Overcurrent (P127 only)

Phase current Fundamental only

Phase or phase to phase voltage Fundamental only

Minimum voltage operating 0.6V

8.1.1 Synchronous polarisation

Minimum phase voltage fixed threshold enabling synchronous polarising:0.6V

Synchronous polarising permanence time phase voltage thresholds:5s

8.1.2 Protection setting ranges (Only P127)

[67] Phase OC Setting Range

I> No or DIR non DIR

I> Current set 0.1 In 25 In 0.01 In

Delay type DT or IDMT (IEC_STI, IEC_SI, IEC_VI,IEC_EI, IEC_LTI, C02, C08, IEEE_MI,IIEEE_VI, IEEE_EI, RI curve)

I> Trip delay time 0 s 150s 0.01s

I> TMS 0.025 1.5 0.025

I> Reset char DT or IDMT

I> RTMS 0.025 1.5 0.025

I> tReset 0.00 s 100 s 0.01 s

Interlock I> byI>>I>>>

No or Yes

I> Torque angle 0 359 1

I> Trip zone 10 170 1

I>> No or Yes or DIR

I>> Current set 0.5 In 40 In 0.01 In

I>> Trip delay time 0 s 150s 0.01s

I>> Torque angle 0 359 1

I>> Trip zone 10 170 1

I>>> No or Yes or DIR

I>>> Current set 0.5 In 40 In 0.01 In

I>>>Trip delay time 0 s 150s 0.01s

I>>> Torque angle 0 359 1

I>>> Trip zone 10 170 1


8.2 [50/51] Phase Overcurrent Protection (P126 Only)

Phase current Fundamental only

8.2.1 Protection setting ranges (Only P126)

[51] Phase OC Setting Range

I> No or Yes

I> Current set 0.1 In 25 In 0.01 In


I> Trip delay time 0 s 150s 0.01s

I> TMS 0.025 1.5 0.025

I> Reset char DT or IDMT

I> RTMS 0.025 1.5 0.025

I> tReset 0.00 s 100 s 0.01 s

Interlock I> byI>>I>>>

No or Yes

I>> No or Yes or DIR

I>> Current set 0.5 In 40 In 0.01 In

I>> Trip delay time 0 s 150s 0.01s

I>>> No or Yes

I>>> Current set 0.5 In 40 In 0.01 In

I>>>Trip delay time 0 s 150s 0.01 s

8.3 [67N/50N/51N] Neutral/Ground/Earth Directional/non Directional EarthOvercurrent Protection (P125, P126 & P127)

Earth Current Fundamental only

Earth current ranges See following table

Residual voltage Fundamental only

Residual voltage range See following table

Minimum Residual voltage operation 1V (Uen: 57 to 130V)

Minimum Residual voltage operation 3V (Uen: 220 to 480V)


8.3.1 Protection setting ranges

[67N] Earth OC Setting Range

High sensitivitycurrent set

Cortec code P12-C-X---X

Ie> 0.002 Ien 1 Ien 0.001 Ien

Ie>> 0.002 Ien 1 Ien 0.001 Ien

Ie>>> 0.002 Ien 1 Ien 0.001 Ien

Med. sensitivitycurrent set

Cortec code P12-B-X---X

Ie> 0.01 Ien 1 Ien 0.005 Ien

Ie>> 0.01 Ien 8 Ien 0.005 Ien

Ie>>> 0.01 Ien 8 Ien 0.005 Ien

Low sensitivitycurrent set

Cortec code P12-A-X---X

Ie> 0.1 Ien 25 Ien 0.1 Ien

Ie>> 0.5 Ien 40 Ien 0.1 Ien

Ie>>> 0.5 Ien 40 Ien 0.1 Ien

Ie> No or Yes or DIR


Ie> Trip delay time 0 s 150s 0.01s

Ie> TMS 0.025 1.5 0.025

Ie> Reset char DT or IDMT

Ie> RTMS 0.025 1.5 0.025

Ie> tReset 0.00 s 100 s 0.01 s

Interlock Ie> byIe>>Ie>>>

No or Yes

Ie> Torque angle 0 359 1

Ie> Trip zone 10 170 1

Input residual voltage with range from 57 to 130V

Ue> 1 V 260 V 0.1 V


Ue> 4 V 960 V 0.5 V

Ie>> No or Yes or DIR

Ie>> Trip delay time 0 s 150s 0.01s

Ie>> Torque angle 0 359 1

Ie>> Trip zone 10 170 1

Ie>> tReset 0.00 s 100 s 0.01 s



[67N] Earth OC Setting Range

Ue>> 1 V 260 V 0.1 V


Ue>> 4 V 960 V 0.5 V

Ie>>> No or Yes or DIR

Ie>>>Trip delay time 0 s 150s 0.01s

Ie>>> Torque angle 0 359 1

Ie>>> Trip zone 10 170 1

Ie>>> tReset 0.00 s 100 s 0.01 s

Input residual voltage From 57 to 130V

Ue>>> 1 V 260 V 0.1 V

Input residual voltage From 220 to 480V

Ue>>> 4 V 960 V 0.5 V

ATTENTION : THE UE THRESHOLDS SETTING DEPEND ON THE ADOPTEDWIRING SCHEME. IN CONFIGURATION/GENERAL OPTIONMENU OF THE P127 RELAY YOU CAN SET THE VE INPUTDIRECTLY FROM A VT(I.E. FROM A DELTA VT) OR DERIVED FROMTHE MEASUREMENT OF THE THREE PHASE TO NEUTRALVOLTAGE (3VPN). IN THIS CASE THE UE IS CALCULATED AS:

CUBUAxUUe

++=31

THE SETTING OF THE UE THRESHOLDS MUST TAKE IN ACCOUNTTHE ABOVE FORMULA.


8.4 Earth Wattmetric Protection (P125, P126 & P127)

Earth current Fundamental only

Residual Voltage Fundamental only

8.5 Functionality mode

This protection can work in Pe or Iecos mode.


[32N] Earth Wattmetric

Setting range

Mode Pe or Iecos

High sensitivity: Current input from 0.002 to 1 Ien

57130V Input voltage Cortec code: P12-CAX---X

Pe> (*) 0.2 x k W 20 x k W 0.02 x k W

Pe>> (*) 0.2 x k W 20 x k W 0.02 x k W

220480V Input voltage Cortec code: P12-CBX---X

Pe> (*) 1 x k W 80 x k W 0.1 x k W

Pe>> (*) 1 x k W 80 x k W 0.1 x k W

Med. sensitivity Current input from 0.01 to 8 Ien

57130V Input voltage Cortec code: P12-BAX---X

Pe> (*) 1 x k W 160 x k W 0.1 x k W

Pe>> (*) 1 x k W 160 x k W 0.1 x k W

220480V Input voltage Cortec code: P12-BBX---X

Pe> (*) 4 x k W 640 x k W 0.5 x k W

Pe>> (*) 4 x k W 640 x k W 0.5 x k W

Low sensitivity Current input from 0.1 to 40 Ien

57130V Input voltage Cortec code: P12-AAX---X

Pe> (*) 10 x k W 800 x k W 1 x k W

Pe>> (*) 10 x k W 800 x k W 1 x k W

220480V Input voltage Cortec code: P12-ABX---X

Pe> (*) 40 x k W 3200 x k W 5 x k W

Pe>> (*) 40 x k W 3200 x k W 5 x k W

Pe> No or Yes

Delay type DT or IDMT (IEC_STI, IEC_SI, IEC_VI,IEC_EI, IEC_LTI, C02, C08, IEEE_MI,IIEEE_VI, IEEE_EI,RI curve)

tPe> Trip delay time 0 s 150s 0.01s

Pe> TMS 0.025 1.5 0.025

Pe> Reset char DT or IDMT

Pe> RTMS 0.025 1.5 0.025


[32N] Earth Wattmetric

Pe> tReset 0.00 s 100 s 0.01 s

Pe>> No or Yes

tPe>> Trip delay time 0 s 150 s 0.01 s

Pe>> tReset 0.00 s 100 s 0.01 s

High sensitivity Iecos Cortec code P12-C-X---X

IeCos> 0.002 Ien 1 Ien 0.001 Ien

IeCos>> 0.002 Ien 1 Ien 0.001 Ien

Med. sensitivity Iecos Cortec code P12-B-X---X



Low sensitivity Iecos Cortec code P12-A-X---X



IeCos> Yes or No


IeCos> Trip delay time 0 s 150s 0.01s

IeCos> TMS 0.025 1.5 0.025

IeCos> Reset type DT or IDMT

IeCos> RTMS 0.025 1.5 0.025

IeCos> tReset 0.00 s 100 s 0.01 s

IeCos>> Yes or No

IeCos>>Trip delay time 0 s 150s 0.01s

IeCos> tReset 0.00 s 100s 0.01s

Pe/IeCos Angle 0 359 1

(*) ATTENTION : THE PE THRESHOLDS ARE DISPLAYED IN THE FORMAT: ##.## X K WTHE THRESHOLD VALUE WILL BE IN WATT SECONDARY.E.G. YOU ARE SETTING PE> THRESHOLD ON THE RELAY DISPLAY;YOU HAVE WRITTEN 20.IF IEN = 1A, THE INTERNAL RELAY SETTING VALUE WILL BE EQUAL TO20 X 1 = 20W.IF IEN = 5A, THE INTERNAL RELAY SETTING VALUE WILL BE EQUAL TO20 X 5 = 100W.


8.6 Undercurrent protection (P126 & P127 only)

Undercurrent associated to the breaker failure function

Phase current: Fundamental only


[37] Under Current Setting ranges

I< No or Yes

I< 0.1 In 1 In 0.01 In

tI< 0 s 150 s 0.01 s

8.7 Negative sequence overcurrent protection (P126 & P127 only)

Phase current: Fundamental only

8.7.1 Protection Setting Ranges

[46] Neg.Seq. OC Setting ranges

I2> No or Yes

I2> 0.1 In 25 In 0.01 In


I2> Trip delay time 0 s 150s 0.01s

I2> TMS 0.025 1.5 0.025

I2> Reset char DT or IDMT

I2> RTMS 0.025 1.5 0.025

I2> tReset 0.04 s 100 s 0.01 s

I2>> No or Yes

I2>> Current set 0.5 In 40 In 0.01 In

I2>> Trip delay time 0 s 150s 0.01s

I2>>> No or Yes

I2>>> Current set 0.5 In 40 In 0.01 In

I2>>>Trip delay time 0 s 150s 0.01s

8.8 Thermal overload protection (P126 & P127 only)

Phase Current: RMS


[49]Therm. OL Setting ranges

Therm. OL No or Yes

I 0.1 In 3.2 In 0.01Te 1 mn 200 mn 1mn

k 1 1,5 0.01

Trip 50% 200% 1% Alarm No or Yes Alarm 50% 200% 1%


8.9 Under Voltage protection (P127 only)


Thresholds selection mode AND or OR (*)

8.9.1 Protection setting ranges (only P127)

[27] Phase Under Voltage

Setting ranges

57130V Inputvoltage.

Cortec code: P127-AX---X

U< No or AND or OR

U< 2 V 130 V 0.1 V

tU< 0 s 600 s 0.01 s

U


8.10 Over Voltage protection (P127 only)


Thresholds selection mode AND or OR (*)

8.10.1 Protection setting ranges (only P127)

[59] Phase Over Voltage

Setting ranges



U> No or AND or OR

U> 2 V 260 V 0.1 V

tU> 0 s 260 s 0.01 s

U>> No or AND or OR

U>> 2 V 260 V 0.1 V

tU>> 0 s 600 s 0.01 s


Cortec code: P127-BX---X

U> No or AND or OR

U> 10 V 960 V 0.5 V

tU> 0 s 600 s 0.01 s

U>> No or AND or OR

U>> 10 V 960 V 0.5 V

tU>> 0 s 600 s 0.01 s

(*) OR = trip caused by one or two or three phase start.AND = trip only caused by three phase start


8.11 Residual Over Voltage protection (P125, P126 & P127)

Residual voltage: Fundamental only


[59] Residual Over Voltage

Setting ranges



Ue>>>> No or Yes

Ue>>>> 1 V 260 V 0.1 V

TUe>>>> 0 s 600 s 0.01 s


Cortec code: P127-BX---X

Ue>>>> No or Yes

Ue>>>> 5 V 960 V 0.5 V

tUe>>>> 0 s 600 s 0.01 s

ATTENTION : THE UE THRESHOLDS SETTING DEPEND ON THE ADOPTEDWIRING SCHEME. IN CONFIGURATION/GENERAL OPTIONMENU OF THE P127 RELAY YOU CAN SET THE VE INPUTDIRECTLY FROM A VT(I.E. FROM A DELTA VT) OR DERIVED FROMTHE MEASUREMENT OF THE THREE PHASE TO NEUTRALVOLTAGE (3VPN). IN THIS CASE THE UE IS CALCULATED AS:

CUBUAxUUe

++=31

THE SETTING OF THE UE THRESHOLDS MUST TAKE IN ACCOUNTTHE ABOVE FORMULA.

8.12 Multishot Autorecloser function (P126 & P127)

Main shots 4 independent shots

External logic inputs 6 inputs (CB opened signal, CB closedsignal, manual opening command, manual closing command, blocking order,cycle activation)

Internal programmable trigger from phase and earth fault on all reclosingcycles

External trigger from digital input.

Inhibit time on manual closing.

Programmable dead and reclaim time setting.


8.12.1 Multishot Autorecloser settings

[79] Autoreclose Setting ranges

Autoreclose Yes or No

Ext. CB Fail Yes or No

Ext. CB Fail time 0.01s 600s 0.01 s

Ext. Aux1 ((I>) Yes or No

Ext. Aux2 (Ie>) Yes or No

Ext. Block Yes or No

td1 Dead time 1 0.01 s 300 s 0.01 s

td2 Dead time 2 0.01 s 300 s 0.01 s

td3 Dead time 3 0.01 s 600 s 0.01 s

td4 Dead time 4 0.01 s 600 s 0.01 s

tR Reclain time 0.02 s 600 s 0.01 s

Inhib Time tI 0.02 s 600 s 0.01 s

Phase Cycle 0 4 1

E/Gnd Cycle 0 4 1


9. AUTOMATION CONTROL FUNCTIONS

9.1 Cold load pickup (P126 & P127)

Cold Load Pick Up Setting ranges

Level 100% 500% 1%

tCL 0.1 s 3600 s 0.1 s

9.2 Auxiliary timers (P126 & P127)

Auxiliary timer 2 associated to the logic Inputs Aux 1, Aux2

Auxiliary timers Setting ranges

tAux1 0 200s 0.01s

tAux2 0 200s 0.01s

9.3 Broken conductor detection (P126 & P127)

Principle used I2/I1

9.3.1 Broken conductor detection setting ranges

Broken Conductor Setting ranges

Brkn.Cond Yes or No

Brkn.Cond 20% 100% 1%

Brkn.Cond Time 0 s 14400 s 1 s

9.4 Circuit breaker failure (P126 & P127)

9.4.1 CB Fail setting ranges

CB Fail Setting ranges

CB Fail Yes or No

CB Fail Time tBF 0 s 10 s 0.01 s

9.5 Trip circuit supervision (P126 & P127)

9.5.1 Trip circuit supervision setting ranges

TC Supervision Setting ranges

TC Supervision Yes or No

t Trip Circuit 0.1 s 10 s 0.1 s


9.6 Circuit breaker control and monitoring (P126 & P127)

9.6.1 Setting ranges

CB Supervision Setting ranges

CB Open Svision Yes or No

CB Open time 0.05 s 1 s 0.01 s

CB Close Svision Yes or No

CB Close time 0.05 s 1 s 0.01 s

CB Open Alarm Yes or No

CB Open NB 0 50000 1

Amps(n) 0 E6 A 4000 E6A

1E6 A

n 1 2 1

CB Open pulse Yes or No

tOpen Pulse 0.1 s 5 s 0.1 s

tClose Pulse 0.1 s 5 s 0.1 s

9.7 AND logic equation (P126 & P127)

For the AND logic equations a setting value 1 assigns the function to the equation, asetting value 0 does not assign the function to equation.

9.7.1 Timer setting ranges

AND LOGIC EQUATTdelay

EQU. A Toperator 0 s 3600 s 0.1 s

EQU. A Treset 0 s 3600 s 0.1 s

EQU. B Toperator 0 s 3600 s 0.1 s

EQU. B Treset 0 s 3600 s 0.1 s

EQU. C Toperator 0 s 3600 s 0.1 s

EQU. C Treset 0 s 3600 s 0.1 s

EQU. D Toperator 0 s 3600 s 0.1 s

EQU. D Treset 0 s 3600 s 0.1 s


10. RECORDING FUNCTIONS (P126 & P127)

10.1 Event recorder

Capacity 75 events

Time-tag 1 millisecond

Triggers Any selected protection alarm andthreshold

Logic input change of state

Setting changes

Self test events

10.2 Fault recorder

Capacity 5 faults

Time-tag 1 millisecond

Triggers Any selected protection alarm andthreshold

Data Fault date

Protection thresholds

Setting Group

AC inputs measurements (RMS)

Fault measurements

10.3 Disturbance recorder

10.3.1 Triggers; Data; Setting Ranges

DisturbanceRecord

P126 P127

Triggers Any selected protection alarm and threshold, Logic input

Remote command

Data AC input channels

Digital input and output states

Frequency value

Default value Setting ranges

Pre-Time 2.5 2.5 0.1 3 0.1

Post-Time 0.5 0.5 0.1 3 0.1

Disturb rec Trig ON TRIP ON TRIP ON TRIP or ON INST.


11. COMMUNICATION (P125, P126, P127)

TypePort

Relayposition Physical Link Connectors Data Rate Protocol

RS485 Rear port Screened twisterpair

Screws orsnap-on

300 to 38400 baud(programmable)

ModBus RTU,Courier,IEC60870-5-103,DNP3

RS232 Front port Screened twisterpair

SubD 9 pinfemaleconnector

300 to 38400 baud(programmable)

ModBus RTU


12. CURVES

12.1 General

Although the curves tend towards infinite when the current approaches Is (generalthreshold), the minimum guaranteed value of the operating current for all the curveswith the inverse time characteristic is 1.1Is (with a tolerance of 0,05Is.

12.1.1 Inverse Time Curves :

The first phases (earth) overcurrent threshold can be selected with a dependent timecharacteristic. The time delay is calculated with a mathematical formula.

In all, there are eleven inverse time characteristics available.

The mathematical formula applicable to the first ten curves is :

( )

+

= LIIKTtS 1

Where:

t operation time

K Coefficient (see table)

I Value of measured current

Is Value of the programmed threshold (Pick-up value)

constant

L ANSI/IEEE constant (zero for IEC curves)

T Time Multiplier Setting

Type of curve Standard K factor factor L factor

Short Time Inverse ALSTOM 0.05 0.04 0

Standard inverse IEC 0.14 0.02 0

Very inverse IEC 13.5 1 0

Extremely inverse IEC 80 2 0

Long time inverse ALSTOM 120 1 0

Short Time Inverse C02 0.02394 0.02 0.00169

Moderately Inverse ANSI/IEEE 0.0515 0.02 0.114

Long Time Inverse C08 5.95 2 0.18

Very Inverse ANSI/IEEE 19.61 2 0.491

Extremely Inverse ANSI/IEEE 28.2 2 0.1215

The RI curve has the following definition:

( )IsIK = t

236,0339,0

1


K setting: from 0,10 to 10 in steps of 0,05.The equation is valid for 1.1 I/Is 20.

12.1.2 Reset timer

The first stage of the phase and earth overcurrent protections, negative sequenceovercurrent and wattmetric/IeCos are provided with a timer hold facility "t Reset".

It may be set to a definite time value or to an inverse time characteristic (IEEE/ANSIcurves only). This may be useful in certain applications, for example when gradingwith upstream electromechanical overcurrent relays which have inherent reset timedelays.

The second and third stages for the wattmetric/Iecos protection and earth faultovercurrent protection have a definite time reset.

A possible situation where the reset timer may be used is to reduce fault clearancetimes where intermittent faults occur.

An example may occur in a plastic insulated cable.

In this application it is possible that the fault energy melts and reseals the cableinsulation extinguishing the fault.

The permanence of the fault current pulses reduce intervals between the pulses untilthe fault becomes permanent.

When the reset time of the relay is to minimum setting, the relay will be repeatedlyreset and not be able to trip until the fault becomes permanent. By using the resettimer hold facility the relay will integrate the fault current pulses, thereby reducingfault clearance time.

The mathematical formula applicable to the five curves is:

( )

=

SIIKTt

1

Where:

t : Reset time

K : Coefficient (see table)

I : Value of the measured current

Is : Value of the programmed threshold (pick-up value)

: Coefficient (see table)

T : Reset Time Multiplier (Rtms) between 0.025 and 1.5.

Type of curve Standard K factor factor

Short Time Inverse C02 0.02394 2

Moderately Inverse ANSI/IEEE 0.0515 2

Long Time Inverse C08 5.95 2

Very Inverse ANSI/IEEE 19.61 2

Extremely Inverse ANSI/IEEE 28.2 2


12.2 IDMT Curves

12.2.1 IEC Curves


12.2.2 RI Curves


12.2.3 IEEE/ANSI CURVES


12.3 Thermal overload curves


BLANK PAGE

RATINGSPower supplyFrequencyCurrent InputsVoltage InputsLogic inputsOutput relay contacts

HIGH VOLTAGE WITHSTANDELECTRICAL ENVIRONMENTENVIRONMENTPROTECTION ACCURACYAUTOMATION FUNCTIONS ACCURACY TIMERSMEASUREMENT ACCURACYPROTECTION SETTING RANGES[67/50/51] Directional/non directional phase Overcurrent (P127 only)[50/51] Phase Overcurrent Protection (P126 Only)[67N/50N/51N] Neutral/Ground/Earth Directional/non Directional Earth Overcurrent Protection (P125, P126 & P127)Earth Wattmetric Protection (P125, P126 & P127)Functionality modeUndercurrent protection (P126 & P127 only)Negative sequence overcurrent protection (P126 & P127 only)Thermal overload protection (P126 & P127 only)Under Voltage protection (P127 only)Over Voltage protection (P127 only)Residual Over Voltage protection (P125, P126 & P127)Multishot Autorecloser function (P126 & P127)

AUTOMATION CONTROL FUNCTIONSCold load pickup (P126 & P127)Auxiliary timers (P126 & P127)Broken conductor detection (P126 & P127)Circuit breaker failure (P126 & P127)Trip circuit supervision (P126 & P127)Circuit breaker control and monitoring (P126 & P127)AND logic equation (P126 & P127)

RECORDING FUNCTIONS (P126 & P127)Event recorderFault recorderDisturbance recorder

COMMUNICATION (P125, P126, P127)CURVESGeneralIDMT CurvesThermal overload curves

Micom - Technical Data

Documents

protection setting ranges

voltage protection p127

monitoring p126 p127

protection accuracy

recording functions

auxiliary timers p126

logic equation p126

voltage protection p125