P 632 Cvpl Transformer Setting

(1)

11KV / 6.9KV, 10MVA TRANSFORMER DIFFERENTIAL PROTECTION

:0.2 : 0.2Iref RECOMMENDED SETTINGS FOR DIFFERENTIAL PROTECTION:

m1 TRANSFORMER DETAILS LV SIDE CT RATIO % IMPEDANCE VECTOR GROUP TAP CHANGER POWER HV SIDE VOLTAGE HV SIDE CT RATIO LV SIDE VOLTAGE : 11KV : 10MVA : DYN11 : +5% T0 -5% : 1000/1A

TRANSFOMER DIFFERENTIAL PROTECTION

AREVA MICOM P632

: 8.35% : 6.9KV : 600/1A

Idiff >

THE TRANSFORMER DIFFERENTIAL PROTECTION RELAY MICOM P632 HAS THE FOLLOWING PARAMETER FOR SETTING

1. PICK UP VALUE OF DIFFERENTIAL CURRENT Idiff > ( OPERATE VALUE OF THE

DIFFERENTIAL PROTECTION FUNCTION AS REFERRED TO THE REFERENCE CURRENT OF THE RELEVANCE TRANSFORMER END )

2. SLOPE 1 OF TRIPPING CHARACTERISTICS, m1 ( GRADIENT OF THE TRIPPING CHARACTERISTICS OF DIFFERENTIAL PROTECTION IN THE RANGE )

3. SLOPE 2 OF TRIPPING CHARACTERISTICS, m2 ( GRADIENT OF THE TRIPPING CHARACTERISTICS OF DIFFERENTIAL PROTECTION IN THE RANGE )

4. BASE POINT FOR SLOPE 2 CHARACTERISTICS, IR, m2 ( THIS SETTING DEFINES THE SECOND KNEEOF THE TRIPPING CHARACTERISTICS ABOVE THE KNEE, THIS GRADIENT IS m2 )

5. THRESHOLD VALUE OF THE DIFFERENTIAL CURRENT FOR THE DEACTIVATION OF THE INRUSH STABILIZATION FUNCTION ( HARMONIC RESTRAINT ) AND OF THE OVER FLUXING RESTRAINT, Idiff>>. ( IF THE THRESHOLD IS SET TOO HIGH, IT IS POSSIBLE FOR THE P632 6. THRESHOLD VALUE OF THE DIFFERENTIAL CURRENT FOR TRIPPING BY THE

DIFFERENTIAL CURRENT FOR TRIPPING BY THE DIFFERENTIAL PROTECTION FUNCTION INDEPENDENT OF RESTRAINING VARIABLES, HARMONIC RESTRAINT, OVER FLUXING

m2 Idiff>> Idiff>>> :10.0Iref :8.0Iref :1.5Iref IR, m2 :0.8

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= 1.0488-1 =0.0488A HENCE THE DIFFERENTIAL CURRENT

BIAS CURRENT =(I1 + I2)/2 =(1.0488+1)/2 =1.0244A =0.920 =0.920*1.14 =1.0488A WITH THE RATIO CORRECTION THE CURRENT AT THE

RELAY BIAS TERMINAL

= 10MVA/(1.732*10.45KV) = 552.5A

FULL LOAD PRIMARY CURRENT (WILL BE CALCULATED BY THE RELAY)

AT -5% TAP CONDITION CURRENT IN HV BIAS CIRCUIT (WINDING a )

-5% OF 11KV = 10.45KV

= 0.83676A EQUIVALENT CURRENT IN CT SECONDARY

(WILL BE CALCULATED BY THE RELAY) REQUIRED RATIO COMPENSATION

=1.195 =1/ 0.83676A

FULL LOAD PRIMARY CURRENT = 10MVA/ (1.732 * 6.9KV) = 836.76A

= 836.76A*1/1000 AT NORMAL CONDITION CURRENT IN LV BIAS CIRCUIT ( WINDING b )

(1.14 WILL BE CALCULATED BY THE RELAY)

EQUIVALENT CURRENT IN CT SECONDARY (600/1A) ( 0.874A WILL BE CALCULATED BY THE RELAY) REQUIRED RATIO COMPENSATION

= 524.88/600=0.874A

= 1/0.874=1.14 AT NORMAL CONDITION CURRENT IN HV BIAS CIRCUIT ( WINDING a )

FULL LOAD PRIMARY CURRENT = 10MVA/ (1.732 * 11KV) = 524.88A

CALCULATION TO VERIFY THE BIAS SETTINGS:

OPERATING CURRENT OF THE RELAY WILL BE

= 0.2+(0.2*1.0244) =0.4048A

( BIAS SETTING m1=0.2)

=Is+(BIAS SETTING m1 * BIAS CURRENT)

(3)

=0.2+(0.2*0.9748) =0.39496A OPERATING CURRENT OF THE RELAY WIL BE

=0.9748A = 0.833A EQUIVALENT CURRENT IN CT SECONDARY

=0.833*1.14 = 0.9496A

HENCE BIAS SETTING OF m1 =20%

BIAS SETTING OF m2

DIFFERENTIAL CURRENTAT WORST TAP CONDITION =0.0504A THIS IS LESS THAN 12% OF OPERATING CURRENT

HENCE BIAS SETTINGS OF

(5% OF 11KV = 11.55KV) = 499.88A

= 10MVA/(1.732*11.55KV) m1 = 20% (TILL 1.5 TIMES OF FULL LOAD CURRENT)

m2 = 80% (FOR THROUGH FAULT STABILITY)

AT 5% TAP CONDITION CURRENT IN HV BIAS CIRCUIT (WINDING a)

FULL LOAD PRIMARY CURRENT

WITH RATIO CORRECTION THE CURENT AT THE RELAY BIAS TERMNAL(I1)

=Is+(BIAS SETTING m1 * BIAS CURRENT)

DIFFERENTIAL CURRENT AT WORST TAP SET =0.0488A =0.4048A OPERATING CURRENT AT WORST TAP SET

DIFFERENTIAL CURRENT AT WORST TAP CONDITION SHOULD NOT BE MORE THAN 90% OF OPERATING CURRENT FOR BETTER STABILITY

=80% FOR THROUGH FAULT STABILITY

=0.39496A OPERATING CURRENT AT WORST TAP

THIS IS LESS THAN 7% OF OPERATING CURRENT

DIFFERENTIAL CURRENT AT WORST TAP CONDITION SHOULD NOT BE MORE THAN 90% OF THE OPERATING CURRENT FOR BETTER STABILITY

= 1-0.9496 = 0.0504A HENCE THE DIFFERENTIAL CURRENT

BIAS CURRENT

=(I1+I2)/2 =(0.9496+1)/2

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GROUP MAIN MAIN MAIN MAIN MAIN MAIN MAIN MAIN MAIN GROUP MAIN MAIN MAIN GROUP MAIN MAIN GROUP DIFF GROUP DIFF DIFF GROUP DIFF DIFF DIFF DIFF DIFF DIFF DIFF DIFF DIFF DIFF DIFF DIFF DIFF DIFF GROUP REF_1 CONFIGURATION IN P632 RELAY

ADDRESS DESCRIPTION ACTIVE VALUE

/PARAMETER/FUNCTION PARAMETERS/GLOBAL/MAIN

OO3.O3O DEVICE ONLINE YES(=ON)

O72.158 O -SEQ FILT.b en YES

O10.O3O NOMINAL FREQUENCY fnom 50HZ

O72.156 O -SEQ FILT.a en YES

O10.O49 PHASE SEQUENCE A-B-C

O72.155 RUSH I (2fo/IfO) 20%

O19.O2O Inom CT PRIM, END a 600A

O72.159 OP.MODE RUSH RST NOT PHASE SELECTIVE

O19.O21 Inom CT PRIM, END b 1000A

O72.148 IR, m2 4.0Iref

Vnom VT PRIM

O72.147 m2 0.7

O1O.O24 Inom DEVICE, END a 1.0A

O72.146 m1 0.3

O1O.O25 Inom DEVICE, END b 1.0A

O72.145 Idiff>(CTS) 0.20Iref

O1O.OO9 110V

O72.144 Idiff>>> 30.0Iref

O72.143 Idiff>> 15.0Iref

0.2Iref

O19.O1O VEC GR ENDS a-b PS1 11

O72.142 Idiff>

O72.152 ENABLE PS1 YES

O16.O96 EVALUATION In, END a CALCULATED

O16.O97 EVALUATION In, END b CALCULATED

O18.OO9 HOLD TIME DYN, PARA CALCULATED

/PARAMETER/FUNCTION PARAMETERS/PARAMETER SUBSET/MAIN ADDRESS

/PARAMETER/CONFIGURATION PARAMETER/DIFF

DESCRIPTION ACTIVE VALUE

O19.O17 Vnom PRIM END a PS1 11.0KV

O56.O27 FUNCTION GOUP DIFF WITH

/PARAMETER/FUNCTION PARAMETER/GENERAL FUNCTION/DIFF

GENERAL ENABLE USER YES

O19.O16 REFERENCE POWER Sref 10.0MVA

/PARAMETER/CONFIGURATION PARAMETER/REF_1

O56.O37 FUNCTION GOUP REF_1 WITH

ACTIVE VALUE DESCRIPTION

Vnom VT SEC

/PARAMETER/FUNCTION PARAMETERS/GENERAL FUNCTION/MAIN

O1O.OO2 11KV

O19.O8O

O19.O18 Vnom PRIM END b PS1 6.9KV

ADDRESS

/PARAMETER/FUNCTION PARAMETER/PARAMETER SUBSET/DIFF

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GROUP REF_1 REF_1 GROUP REF_1 REF_1 REF_1 REF_1 REF_1 REF_1 REF_1 GROUP REF_2 GROUP REF_2 REF_2 GROUP REF_2 REF_2 REF_2 REF_2 REF_2 REF_2 REF_2 GROUP IDMT1 GROUP IDMT1 IDMT1 GROUP IDMT1 IDMT1 IDMT1 IDMT1 GROUP IDMT2

O72.141 ENABLE YES

O19.O5O YES

O19.O31 REFERENCE POWER Sref

O72.149 LOW IMPEDANCE

O72.150 Idiff> 0.2Iref

OPERATING MODE

O72.162 m1 O.2

O72.163 m2 1.5

O72.164 IR, m2 1.00Iref

ACTIVE VALUE /PARAMETER/FUNCTION PARAMETER/GENERAL FUNCTION/REF_1

GENERAL ENABLE USER

/PARAMETER/FUNCTION PARAMETER/PARAMETER SUBSET/REF_1

O72.172 m1 O.2

O8O.OO7 OPERATING MODE LOW IMPEDANCE

O72.17O Idiff> 0.2Iref

ENABLE YES

/PARAMETER/FUNCTION PARAMETER/PARAMETER SUBSET/REF_2

ADDRESS DESCRIPTION

O72.161

/PARAMETER/CONFIGURATION PARAMETER/REF_2

O56.O38 FUNCTION GOUP DIFF WITH

/PARAMETER/FUNCTION PARAMETER/GENERAL FUNCTION/DIFF

O19.O5O GENERAL ENABLE USER YES

O19.O32 REFERENCE POWER Sref 10.0MVA

/PARAMETER/CONFIGURATION PARAMETER/IDMT 1

O72.165 m2 1.5

O72.166 IR, m2 1.00Iref

/PARAMETER/FUNCTION PARAMETER/GENERAL FUNCTION/IDMT 1

O31.141 GENERAL ENABLE USER YES

O19.1O6 SELECT MEASURED INPUT END a

/PARAMETER/FUNCTION PARAMETER/PARAMETER SUBSET/IDMT 1

O81.O5O ENABLE YES

O81.O59 GENERAL STARTING MODE WITH START In/Ineg

O81.O51 Iref, P 1.OOInom

O81.O52 Iref, P DYNAMIC 4.OOInom

/PARAMETER/CONFIGURATION PARAMETER/IDMT 2

O56.O61 FUNCTION GOUP IDMT 2 WITH

10.0MVA

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GROUP IDMT2 IDMT2 GROUP IDMT2 IDMT2 IDMT2 IDMT2 GROUP V<> GROUP V<> GROUP V<> V<> V<> V<> V<> V<> V<> V<> V<> V<> tV<< O76.OO10 O76.O46 Vmin> V< V<< tV< O76.OO7 O76.OO8 O76.OO9

/PARAMETER/FUNCTION PARAMETER/GENERAL FUNCTION/IDMT 2

O31.142 GENERAL ENABLE USER YES

O19.116 SELECT MEASURED INPUT END b

/PARAMETER/FUNCTION PARAMETER/PARAMETER SUBSET/IDMT 2

O81.17O ENABLE YES

O81.179 GENERAL STARTING MODE WITH START In/Ineg

O81.171 Iref, P 1.OOInom

O81.172 Iref, P DYNAMIC 4.OOInom

/PARAMETER/CONFIGURATION PARAMETER/V<>

/PARAMETER/FUNCTION PARAMETER/GENERAL FUNCTION/V<>

/PARAMETER/FUNCTION PARAMETER/PARAMETER SUBSET/V<>

O23.O3O GENERAL ENABLE USER YES

O76.OOO ENABLE YES

O76.OO3 V> 1.1OVnom O76.OO4 V>> 1.2OVnom O76.OO5 tV> 5.OOS tV>> O76.OO6 O.25Vnom 1.OOS O.9Vnom O.8Vnom 5.OOS 1.OOS