p632 Testing Procedure of Tranformer Diffrential Protection

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TESTING PROCEDURE FOR TRANSFORMER DIFFERENTIAL PROTECTION RELAY USING CONVENTIONAL KIT

This test procedure is not for circulation and should be carried out by well trained person. This procedure explained about operating value test and operating time test only. Individual function only is considered for testing purposes and suitable setting can be adopted and tested. It is not necessary to test the relay at all setting and one setting is enough for confirming relay operation .Since P633/P32 is a numerical relay ,scheme operation check and load check should be carried out by seeing measurement CHAPTER and DISTURBANCE RECORDER WAVE FORM only. Particulars of apparatus to be tested: Designation : Transformer Differential Protection Device(Relay) Type P631/ P632/ P633/P634 Model No. : Sl.No. : Rating : In=1/5 A, Vx=48-250 VDC/100-230VAC,Vn=50-130V AC Rated Auxiliary supply : 220 VDC Identification No. : Drawing No. : P632 Mounting : Vertical [Normal service] Condition of sample : New Tests to be conducted: PRODUCT DETAILS: Rated Input current

: 1/5 A

Operating characteristics

:Differential Over current

Setting

: Idiff>0.1to2.5Amp,Idiff>>2.5to30Amp, Idiff>>>2.5to30Amp,

Rated Auxiliary supply

: 220 VDC

Range

: 48-250 VDC/100-230VAC

TERMINAL DETAILS: Auxiliary supply terminals Current input terminals a- side (HV SIDE )

b-side ( LV SIDE)

: 20X25 (+) & 20X26 (-) : 1/5 A A -Phase 04X1 & 04X 2 B -Phase 04X3 & 04X 4 C -Phase 04X5 & 04X 6 N 04X7 & 04X 8 A -Phase 06X1 & 06X 2 B -Phase 06X3 & 06X 4 C -Phase 06X5 & 06X 6 N 06X7 & 06X 8

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Voltage input terminals

:

Output contacts (O/C) : Relay

OPTO INPUT

:

U1 U2 U3 U4

Test conditions: Auxiliary voltage to be applied

04X13 & 04X16 K1 (Tripping) 20X1 & 20X 2 (N/O) 20X3 & 20X 4 (N/O) K2 20X5 & 20X 6 (N/C) 20X7 & 20X 6 (N/O) K3 20X8 & 20X 9 (N/O) K4 20X10 & 20X11 (N/O) K5 20X10 & 20X12 (N/O) K6 20X10 & 20X13 (N/O) K7 20X10 & 20X14 (N/O) K8 20X15 & 20X16 (N/C) 20X17 & 20X16 (N/O) 20X18 (+ ive)& 20X19 (-ive) 20X20 (+ ive)& 20X21 (-ive) 20X22 (+ ive)& 20X24 (-ive) 20X23 (+ ive)& 20X24 (-ive) : 220 VDC

1.0 ACCURACY TEST: 1.1 Determination of errors relating to characteristic quantity: Output RL-3 is assigned permanently for following FUNCTIONS

Id>A Id>B Id>C Id>>A Id>>B Id>>C Io> HV Io> LV1 Io> LV2 Aux0 Relay Setting -- Operating value test: 1) DIFFERETIAL FUNCTION TEST Relay setting

/Parameters/Function parameters/Parameter subset 1/DIFF DIFF Enable PS1--Yes DIFF Idiff> PS1--0.20 Iref DIFF Idiff>> PS1--15.0 Iref DIFF Idiff>>> PS1--BLOCKED DIFF m1 PS1--0.20 DIFF m2 PS1--0.80 DIFF IR,m2 PS1--1.5 Iref

A

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DIFF DIFF DIFF

Op.mode rush rst.PS1--With RushI(2f0)/I(f0) PS1--20 % 0-seq. filt.a en.PS1--No

DIFF DIFF DIFF DIFF DIFF

0-seq. filt.b en.PS1--No Overflux.bl. en. PS1--No Ov. I(5f0)/I(f0) PS1--20 % Op.del.,trip sig.PS1--0.00 s Hyst. effective PS1--No

Procedure: Input energizing quantity (current) is increased slowly until relay contact operates a- SIDE (HV SIDE ) Sl No

Idiff>

Measured Operating Value A-PHASE B-PHASE

(Amp) C-PHASE

0.20 Iref 1.00 Iref 2.00 Iref

Sl No

Idiff>>

Claimed Value (Amp) 0.099 to 0.121 0.198 to 0.242 0.297 to 0.363

Measured Operating Value A-PHASE B-PHASE

(Amp) C-PHASE

3.00 Iref 10.0 Iref 25.0 Iref

Claimed Value (Amp) 0.099 to 0.121 0.198 to 0.242 0.297 to 0.363

b- SIDE (LV SIDE ) Sl No

Idiff>

Measured Operating Value A-PHASE B-PHASE

(Amp) C-PHASE

0.20 Iref 1.00 Iref 2.00 Iref

Sl No

Idiff>> 3.00 Iref 10.0 Iref 25.0 Iref

Claimed Value (Amp) 0.099 to 0.121 0.198 to 0.242 0.297 to 0.363

Measured Operating Value A-PHASE B-PHASE

(Amp) C-PHASE

Claimed Value (Amp) 0.099 to 0.121 0.198 to 0.242 0.297 to 0.363

Bias Test Procedure: Apply equal value of current in a-SIDE (HV SIDE ) & b-SIDE (LV SIDE ). a-SIDE (HV SIDE ) input energizing quantity (current) is increased slowly until relay contact operates Actual Differential Current = Vector sum of both current Bias Current = ( Magnitude sum of currents) / 2

A

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Theoretical Diffl current = 0.2+0.2 XIb (for slope=20%) =0.2 +0.2 X 1.5 +(Ib-1.5) X 0.8 (for slope=80%) Phase s

A-Ph

B-Ph

C-Ph

Applied Current (LV1)

Measured Current (HVside1)

0.2 A 0.5 A 1.0 A 2.5 A 5.0 A 0.2 A 0.5 A 1.0 A 2.5 A 5.0 A 0.2 A 0.5 A 1.0 A 2.5 A 5.0 A

Calculated Calculated Claimed value Diffl. Bias Diffl Current Current (Amp) 0.239 to 0.293 0.301 to 0.369 0.582 to 0.712 2.381 to 2.911 5.418 to 6.622 0.239 to 0.293 0.301 to 0.369 0.582 to 0.712 2.381 to 2.911 5.418 to 6.622 0.239 to 0.293 0.301 to 0.369 0.582 to 0.712 2.381 to 2.911 5.418 to 6.622

SECOND HARMONIC TEST Procedure: Rated Input energizing quantity (current-1A/50Hz is applied in A-PHASE and relay is found to be in the operated condition .Apply current with frequency 100Hz in phase with 50Hz current in A-PHASE and increase slowly until relay contact opens. Record 100Hz current as Second harmonic restrain current Sl No

RushI(2f0)/I(f0)

Applied 50Hz current (Amp)

Measured Resetting Value of 100Hz (Amp)

20 % 30%

Claimed Value (Amp) 0.0925 to 0.1075 0.0925 to 0.1075

REF TEST Procedure: Input energizing quantity (current) is increased slowly until relay contact operates a- SIDE REF (HV SIDE ) Relay setting

/Parameters/Function parameters/Parameter subset 1/REF_1 REF_1 Enable PS1--Yes REF_1 Operating mode PS1--High impedance REF_1 Idiff> PS1--1.00 Iref REF_1 Idiff>>> PS1--Blocked

K

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Sl No

REF_1 REF_1

m1 m2

PS1--0.20 PS1--1.50

REF_1

IR,m2

PS1--1.00 Iref

Measured Operating Value

Idiff>

(Amp)

Setting 0.2 Iref 0.3 Iref 0.5 Iref 0.7 Iref 1.0 Iref

Claimed Value (Amp) 0.19 to 0.21 0.285 to 0.315 0.475 to 0.525 0.665 to 0.735 0..95 to 1.05

b- SIDE REF (LV SIDE ) Relay Setting

/Parameters/Function parameters/Parameter subset 1/REF_2 REF_2 Enable PS1-- Yes REF_2 Operating mode PS1-- High impedance REF_2 Idiff> PS1-- 0.20 Iref REF_2 Idiff>>> PS1-- Blocked REF_2 m1 PS1-- 0.20 REF_2 m2 PS1-- 1.50 REF_2 IR,m2 PS1-- 1.00 Iref

Sl No

Measured Operating Value

Idiff>

(Amp)

Setting 0.2 Iref 0.3 Iref 0.5 Iref 0.7 Iref 1.0 Iref

Claimed Value (Amp) 0.19 to 0.21 0.285 to 0.315 0.475 to 0.525 0.665 to 0.735 0.95 to 1.05

DTOC FUNCTION TEST

Procedure: Input energizing quantity (current) is increased slowly until relay contact operates RELAY SETTING

/Parameters/Function parameters/Parameter subset 1/DTOC1

DTOC1 DTOC1 DTOC1 DTOC1

Enable PS1--Yes Block tim.st. IN PS1--Without Gen.starting modePS1--W/o start. IN/Ineg tGS PS1--0.00 s

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DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1 DTOC1

Rush restr.enabl PS1--No I> PS1--1.00 Inom I>> PS1--30.00 Inom I>>> PS1--30.00 Inom I> dynamic PS1--1.00 Inom I>> dynamic PS1--1.00 Inom I>>> dynamic PS1--1.00 Inom tI> PS1--0.00 s tI>> PS1--0.00 s tI>>> PS1--0.00 s Ineg> PS1--0.25 Inom Ineg>> PS1--8.00 Inom Ineg>>> PS1--8.00 Inom Ineg> dynamic PS1--1.00 Inom Ineg>> dynamic PS1--1.00 Inom Ineg>>> dynamic PS1--1.00 Inom tIneg> PS1--0.00 s tIneg>> PS1--0.00 s tIneg>>> PS1--0.00 s IN> PS1--0.25 Inom IN>> PS1--8.00 Inom IN>>> PS1--8.00 Inom IN> dynamic PS1--1.00 Inom IN>> dynamic PS1--1.00 Inom IN>>> dynamic PS1--1.00 Inom tIN> PS1--0.00 s tIN>> PS1--0.00 s tIN>>> PS1--0.00 s

a.2.1) For phase fault (A,B,C) I >; tI> 0 sec I> Setting

Value(A AC)

I nom

0.5 I nom 5 I nom 20 I nom

0.5 5 20

1 1 1

Measured operating value A Ph B Ph C Ph

Claimed operating value (AAC) 0.475 – 0.525 4.75 – 5.25 19 – 21

a.2.2) For phase fault (A,B,C) I>>; tI >> 0 sec I>> Setting

Value(A AC)

I nom

0.5 I nom 5 I nom 20 I nom

0.5 5 20

1 1 1

Measured operating value A Ph B Ph C Ph

Claimed operating value (AAC) 0.475 – 0.525 4.75 – 5.25 19 – 21

a.2.3) For phase fault (A,B,C) I >>> ; tI>>> 0 sec I>>> Setting Value(A AC)

I nom

Measured operating value

Claimed operating value

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A Ph 0.5 I nom 5 I nom 20 I nom

0.5 5 20

B Ph

C Ph

(AAC) 0.475 – 0.525 4.75 – 5.25 19 – 21

1 1 1

a.2.5) For earth fault IN> ; tIN> 0 sec IN> Setting

Value(A AC)

I nom

0.2 I nom 1 I nom 8.0 I nom

0.2 1.0 8.0

1 1 1

Measured operating value I neutral>

Claimed operating value (AAC) 0.19 – 0.21 0.95 – 1.05 7.60– 8.40

a.2.6) For earth fault IN>> ; tIN>> 0 sec IN>> Setting

Value(A AC)

I nom

0.2 I nom 1 I nom 8.0 I nom

0.2 1.0 8.0

1 1 1

Measured operating value I neutral>>

Claimed operating value (AAC) 0.19 – 0.21 0.95 – 1.05 7.60 – 8.40

a.2.7) For earth fault IN>>> ; tIN>>> 0 sec IN>>> Setting

Value(A AC)

I nom

0.2 I nom 1 I nom 8.0 I nom

0.2 1.0 8

1 1 1

Measured operating value I neutral>>>

Claimed operating value (AAC) 0.19 – 0.21 0.95 – 1.05 7.60– 8.40

a.2.9) For NEGATIVE SEQUENCE Ineg > ; tIneg > 0 sec Procedure: Apply 3 phase Negative sequence current and increase till the function assigned contact closes INEG> Setting Value(A AC)

I nom

0.5 I nom 5 I nom 8.0 I nom

1 1 1

0.5 5 8.0

Measured operating value Ineg>

Claimed operating value (AAC) 0.475 – 0.525 4.75 – 5.25 7.60 – 8.40

a.2.10) For NEGATIVE SEQUEMCE Ineg > >; tIneg >> 0 sec INEG>> Setting 0.5 A 5A 8.0 I nom

Value(A AC) 0.5 5 8.0

I nom 1 1 1

Measured operating value Ineg>>

Claimed operating value (AAC) 0.475 – 0.525 4.75 – 5.25 7.60 – 8.40

a.2.11) For NEGATIVE SEQUEMCE Ineg > >>; tIneg >>> 0 sec

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INEG>>> Setting 0.5 I nom 5 I nom 8.0 I nom

Value(A AC)

I nom

0.5 5 8.0

1 1 1

Measured operating value I neg>>>

Claimed operating value (AAC) 0.475 – 0.525 4.75 – 5.25 7.60 – 8.40

a.3) IDMT FUNCTION TEST

/Parameters/Function parameters/Parameter subset 1/IDMT1

IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1 IDMT1

Enable PS1-- Yes Block tim.st. IN PS1-- Without Gen.starting modePS1-- W/o start. IN/Ineg tGS PS1-- 0.00 s Rush restr.enabl PS1-- No Iref,P PS1-- 1.00 Inom Iref,P dynamic PS1-- 1.00 Inom Characteristic P PS1-- Definite Time Factor kt,P PS1-- 1.00 Min. trip t. P PS1-- 0.00 s Hold time P PS1-- 0.00 s Release P PS1-- Without delay Iref,neg PS1-- 0.80 Inom Iref,neg dynamic PS1-- Blocked Character. neg. PS1-- Definite Time Factor kt,neg PS1-- 1.00 Min. trip t. neg PS1-- 1.00 s Hold time neg PS1-- 0.00 s Release neg PS1-- Without delay Iref,N PS1-- 0.80 Inom Iref,N dynamic PS1-- Blocked Characteristic N PS1-- Definite Time Factor kt,N PS1-- 1.00 Min. trip t. N PS1-- 1.00 s Hold time N PS1-- 0.00 s Release N PS1-- Without delay

a.3.1) For phase fault (A,B,C) ; Min. trip t. P= 0 sec

Iref,P

Value(A AC)

I nom

Setting 0.2 I nom 1 I nom 4 I nom

0.2 1.0 4.0

1 1 1

Measured operating value A Ph B Ph C Ph

Claimed operating value (AAC) 0.19 – 2.1 0.95 – 1.05 3.8 – 4.2

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a.3.2) For NEGATIVE SEQUENCE Iref,neg Min. trip t. neg= 0 sec Procedure: Apply 3 phase Negative sequence current and increase till the function assigned contact closes

Iref,neg

Value(A AC)

I nom

Setting 0.2 I nom 0.4 I nom 0.8 I nom

0.2 0.4 0.8

1 1 1

Measured operating value Ineg

Claimed operating value (AAC) 0.19 – 2.1 0.38—0.42 0.76 – 0.84

a.3.3) For earth fault Iref,N ; Min. trip t. N= 0 sec

Iref,N Setting

Value(A AC)

I nom

0.2 I nom 0.4 I nom 0.8 I nom

0.2 0.4 0.8

1 1 1

Measured operating value I neutral

Claimed operating value (AAC) 0.19 – 2.1 0.38—0.42 0.76 – 0.84

a.4 ) V < > (UNDER/OVER VOLTAGE) Procedure: Apply 3ph-n voltage(63.5V) and increase one phase voltage for over voltage or decrease one phase voltage for under voltage function till the function assigned contact closes RELAY SETTING

/Parameters/Function parameters/Parameter subset 1/V V V V V V V V V V V V V

Enable PS1-- Yes V> PS1-- 1. Vnom V>> PS1-- 1. Vnom tV> PS1-- 0.00 s tV>> PS1-- 0.00 s V< PS1-- 0.80 Vnom V PS1-- 0.25 Vnom tV< PS1-- Blocked tV ;tV > 0 sec V> Setting 1.1 V nom

Value(V AC) 69.859/121

V nom 110/3 V

Measured operating value V> AN BN CN

Claimed operating value (V AC) 67.763—71.955

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1.25 V nom 1.5 V nom

79.385/137 .5 95.263/165

110/3 V

77.003 --- 81.766

110/3 V

92.405—98.121

a.3.2) OVER VOLTAGE V>> ;tV> > 0 sec V> > Setting 1.1 V nom 1.25 V nom 1.5 V nom

Value(V AC) 69.859 79.385 95.263

V nom

Measured operating value V>> AN BN CN

Claimed operating value (V AC) 67.763—71.955 77.003 --- 81.766 92.405—98.121

110/3 V 110/3 V 110/3 V

a.3.3) UNDER VOLTAGE V< ;tV< 0 sec V< Setting

Value(V AC)

V nom

Measured operating value V< AN BN CN

0.3 V nom 0.6 V nom 0.9 V nom

19.05 38.10 57.15

110/3 V 110/3 V 110/3 V

Claimed operating value (V AC) 18.478—19.622 36.957---39.243 55.435—58.865

a.3.4) UNDER VOLTAGE V> PS1-- Blocked V/f tV/f> PS1-- 0 s V/f t at V/f=1.05 PS1-- 72.8 s V/f t at V/f=1.10 PS1-- 18.8 s V/f t at V/f=1.15 PS1-- 8.8 s V/f t at V/f=1.20 PS1-- 5.3 s V/f t at V/f=1.25 PS1-- 3.7 s

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V/f V/f V/f V/f V/f V/f V/f V/f V/f

t at V/f=1.30 PS1-- 2.8 s t at V/f=1.35 PS1-- 2.3 s t at V/f=1.40 PS1-- 1.9 s t at V/f=1.45 PS1-- 1.7 s t at V/f=1.50 PS1-- 1.5 s t at V/f=1.55 PS1-- 1.4 s t at V/f=1.60 PS1-- 1.3 s Reset time PS1-- 0 s tV/f>> PS1-- 0 s

Procedure :Apply AC voltage (50Hz) less than setting and increase the voltage with time delay of 200mSec till it operates. Record the value (Operating value = setting X supply frequency ) Sl No

V/f> (alarm)

Value(V AC)

Measured Operating Value (Volt)

Setting (Vnom/fnom)

1.00 110.0 1.10 121.0 1.19 130.9

Claimed Value (Volt) 106.70 to 113.30 117.37 to 124.63 126.973 to 134.83

1.2 Operating time test LOW SET OPERATING TIME; Relay Setting

SETTINGS(1) S1 Id> 200.0e-3PU Procedure: Apply 1ph current with 5 times setting value & measure operating time .. HV SIDE1 Sl No Measured Operating Time Claimed Operating Time A-PHASE

B-PHASE

C-PHASE 30 to 40 m Sec

HIGH SET OPERATING TIME; Relay Setting

SETTINGS(1) S1 Id>>

5 PU

Procedure: Apply 1ph current with 5 times setting value & measure operating time .. LV 1 Sl No Measured Operating Time Claimed Operating Time A-PHASE

B-PHASE

C-PHASE 10 to 20 m Sec

REF OPERATING TIME; Relay Setting

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SETTINGS(1) S1 Io> HV S1 Io> LV1 S1 Io> LV2

100.0e-3PU 100.0e-3PU 100.0e-3PU

Procedure: Apply 1ph current with 5 times setting value & measure operating time .. Sl No Measured Operating Time Claimed Operating Time HV

LV1

LV2 20 to 40 m Sec

OVERFLUX OPERATING TIME(TRIP); Relay Setting

SETTINGS(1) S1 V/f(Trip)Char DT S1 V/f (Trip) 2.20Procedure: Apply voltage 121VAC (110% OF SETTING) ,50Hz and measure operating time Sl No tV/f (Trip) setting Measured Operating Time Claimed Operating Time (Sec)

(Sec) 1.90 to 2.1S 19.0 to 21.0S 47.5 to 52.5

2S 20 S 50 S Relay Setting

SETTINGS(1) S1 V/f(Trip) I DMT S1 V/f (Trip) 2.20S1 TMS 1 Procedure: Apply voltage 121VAC (110% OF SETTING) ,50Hz and measure operating time Sl No Applied Voltage Measured Operating Time Claimed Operating Time (Sec)

(Sec) 16.92 to 20.68 4.770 to 5.83 2.520 to 3.08

121V 132V 143V OVERFLUX OPERATING TIME(ALARM); Relay Setting

SETTINGS(1) S1 V/f(Trip)Char DT S1 V/f (ALARM) 2.20Procedure: Apply voltage 121VAC (110% OF SETTING) ,50Hz and measure operating time Sl No tV/f (ALARM) setting Measured Operating Time Claimed Operating Time (Sec) 2S 20 S

(Sec) 1.90 to 2.1S 19.0 to 21.0S

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50 S

47.5 to 52.5