7UT612 Procedure

Site Test Report For Differential Protection

Customer SEC-SOA Contract # 40631024/00

ProjectExtension of MuhayilS/S 132/33 KV

Job #

Location MUHAYEL Equipment Tag 6T1

RELAY DETAILS

RELAY ANSI NO. 87T RELAY FUNCTION TRANS. DIFF

RELAY MAKE SIEMENS NOMINAL CURRENT 1A

TYPE / STYLE 7UT612 AUX SUPPLY VOLTAGE 60-125VDC

S. NO.

1-VISUAL AND MECHANICAL INSPECTION:

CHECK NAME PLATE DATA ACCORDING TO THE DRAWINGO.K

CHECK FOR TRANSPORTATION DAMAGE AND CORRECT POSITION O.K

VERIFY TIGHTNEES OF EXTERNAL WIRINGO.K

2-ELECTRICAL CHECKS:

ALL CONNECTIONS CHECK ACCORDING TO WIRING DIAGRAMO.K

AUX.SUPPLY CHECKED FOR RATING AND POLARITYO.K

CASING EARTHING CHECKO.K

All 7 programmable LEDs – apply Test LEDs under Test mode (Hardware test). OK

Remarks

Test Inst. Used FREJA300

Tested By

Name: Eng. Mohamed Shokry Date: 20/07/09 Signature:

Witnessed By

Name: Eng .ALI Al AMRIDate:

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Job #


3- TRANSFORMER DATA:

RATIO: 132/13.8KV MVA: 67 MVA H.V SIDE VOLTAGE: 132KV L.V SIDE VOLTAGE: 13.8KV GROUP NO: DYN1 FREQUNCEY: 60 HZ H.V SIDE C.T RATIO: 500/1 H.V SIDE C.T RATIO: 3000/1 IMPEDENCE VOLTAGE: 14% H.V CALCULATED FULL LOAD CURRENT: 293.0 A = 0.586 A (sec value) LV CALCULATED FULL LOAD CURRENT: 2803.0 A = 0.934 (sec value)*** Full load current= Trans MVA/Root of 3* KV

Remarks


Tested By


Witnessed By


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Job #


4. INPUT OPTO-ISOLATORS CHECKS (With Relay Energized):

GO TO TEST MODE (HARDWARE TEST) FOR CHECKING STATUS OF INPUTS

OPTO INPUT

NO.

TEST METHOD(Energize only one at a time by soft ware)

RESULTDisplay 0

to 1

REMARKS

OPTO 1 ENERGIZE BI 1 (High) OK Spare



5. OUTPUT RELAYS CHECKS (With Relay Energized):

OUTPUT RELAY

No.

TEST METHOD(Energize only one at a time by soft ware)

RESULTContact Checked REMARKS

RL1CONTACT OPERATED F6-F7

(N/O)OK Relay trip


(N/O)OK Spare


(N/O)OK Spare


(N/O)OK Spare

Remarks


Tested By


Witnessed By


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Job #


6- PICK UP TEST IDIFF> :

I D> KVG

CALCULATEDPH A PH B PH C

TRIP P.U D.OTRIP P.U D.O TRIP P.U D.O TRIP P.U D.O

CT INPUT 1

(HV Side)

0.25 1.0 0.147 0.125 0.103 0.147 0.126 0.104 0.146 0.123 0.102 0.1470.125

0.102

0.5 1.0 0.293 0.249 0.205 0.293 0.250 0.207 0.292 0.248 0.205 0.2930.25

00.207

1.0 1.0 0.586 0.498 0.410 0.586 0.502 0.413 0.586 0.497 0.410 0.5860.49

80.411

CT INPUT 2

(LV Side)

0.25 1.73 0.41 0.35 0.287 0.403 0.342 0.285 0.403 0.344 0.286 0.4010.34

50.285

0.5 1.73 0.810 0.688 0.567 0.810 0.689 0.567 0.806 0.684 0.567 0.8070.68

50.570

1.0 1.73 1.620 1.377 1.134 1.621 1.374 1.138 1.619 1.381 0.139 1.6131.37

71.134

Select any Phase in HVS and inject current until pickup led then go up until trip contact operate then go down again tell the pickup led disappear for delta winding program the O/P contact for each phase you test every time

TRIP = IDIFF>* Kvg*In Trans /In CT TRIP h.v = IDIFF>*1.0* 293/(500/1)= 0.586*IDFF> A TRIP l.v = IDIFF>*1.73* 2803/(3000/1)= 1.62*IDFF> A P.U =85% TRIP VALUE

D.O =70% TRIP VALUE

7- TIMING TEST (adress1625):

SETTING TIME(S)

MEASURED TIME @ 2 IsA B C

H.V L.V H.V L.V H.V L.V

0.0 37.8ms 37.9ms 39.9ms 37.2ms 38.3ms 34.3ms

RELAY INHERENT TIME = 35 ms

Remarks


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Job #


8- PICK UP& TIMING FOR IDFF>> :

I DIFF>>SETTING

Kvg CAL. Trip (A)

Trip value (A) TRIP TIME @ 2 Is (ms)

Ph A Ph B Ph C Ph A Ph B Ph CCT INPUT 1(HV WINDING) 1.5 In 1.0 0.879 0.879 0.876 0.878 27 27.4 28.4

CT INPUT 2(LV WINDING) 1.5 In 1.73 2.43 2.418 2.418 2.425 27 27.4 27.6

Change the setting for I DIFF> to be 2 In then make pick up for I DIFF>> or make another contact for I DIFF>> only

Pick up = I diff>> * Kvg * In trans/ In CT Trip hv = IDIFF>*1.0* 293/(500/1)= 0.586 *IDFF>> A Trip l.v = IDIFF>*1.73* 2803/(3000/1)= 1.62*IDFF>> A P.U =85% TRIP VALUE D.O =70% TRIP Value RELAY INHERENT TIME = 25 ms

Remarks


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Job #


9- Slop (Bias) Test:

I: slope 1

Slope1 M I1 (source1) I2 (source2)Operating angle

(Either one source)Measured slope

0.250.5 0.293 0.81 27.9 0.241 0.586 1.62 27 0.24

1.5 0.879 2.43 27.7 0.23

Slope calculation: Slope = [A2 + B2] 1/2 A = [M - M x cos θ]

2 x M B = M x sin θ

I1= Kvg *M* I nsec W1 = 0.586 M where M constant , Kvg = (1.0) Ph-N I2= Kvg *M* I nsec W2 = 1.62 M where M constant , Kvg = (1.73) Ph-N The calculated slope 1 should be with in +-10% of setting

Inject same phase (L1) to High side & low side by stable current in table with phase shift 180 ۫ and increase the angle of HS till Trip then calculate the slop by this angle

Remarks


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Witnessed By


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Job #


II: slope 2 :

Slope2 M I1 (source1) I2 (source2)Operating angle

(Either one source)Measured slope

0.501 0.586 1.62 59 0.49

1.5 0.879 2.43 58 0.482 1.172 3.24 51.1 0.34

Slope calculation: Slope = [A2 + B2] 1/2 A = [M - M x cos θ]

2 x M B = M x sin θ

I1= Kvg* M* In sec W1 = 0.586 M where M constant , Kvg = (1.0) Ph-N I2= Kvg* M* In sec W2 =1.62 M where M constant , Kvg = (1.73) Ph-N The calculated slope 2 should be with in +-10% of setting

*** To test slope 2 base point to shifted to origin.

Inject same phase(L1) to High side & low side by stable current in table with phase shift 180 ۫ and increase the angle of HS till Trip then calculate the slop by this angle

Remarks


Tested By


Witnessed By


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Job #


10- HARMONICS CHECK:

I 2 nd HARMONICS :

SETTING%

INJECTED CURRENT

(A)

HV LVREMARKS

TRIP BLOCK TRIP BLOCK

15 1 <16% >16% <16% >16% -

By Freja Remote mode (Edit curve)Inject 1A Have fundamental + 10 % of 2nd Harmonic and increase the value of harmonic in curve till Block

II 5 TH HARMONICS :

SETTING%

INJECTED CURRENT

(A)

HV LVREMARKS

TRIP BLOCK TRIP BLOCK

30 0.4 <30% >30% <30% >30% -

By Freja Remote mode Inject 0.4A Have fundamental + 10 % of 5nd Harmonic and increase the value of harmonic in curve till Block (Injection current must not excised the( limit IDIFF max of n-th harm-Restrain) setting

Remarks


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Job #


11-Cross Blocking 2 nd Harmonics adress1612:

Procedure:1. Inject two different phase at same time at one side2. Phase A>Id with fundamental harmonics3. Phase B>Id with 2nd harmonics4. 1 Cycle=60HZ=1/60 =0.01666 sec

Time set in (Cycles)

Time set in (s)

Time measured(s)

0.0 - -125 2.075 126.3250 4.15500 8.31000 16.6

Remarks


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Job #


Table 6: Correction Factor for 87-Itrip(Wx)

Notes:1. For this table, 0 is considered even.2. Use this row if the I0Process setting for the tested winding is I0 – Elimination. The settingsare Address 1106 for Winding 1, Address 1126 for Winding 2, and Address 1146 for Winding 3.3. Use this row if the I0Process setting for the tested winding is either without or I0 – CORRECTION. The settings are Address 1106 for Winding 1, Address 1126 for Winding 2, and Address 1146 for Winding 3.In tests 1-3 current is injected in one phase at any time; therefore, use the rows for 1-phase faults. Theother fault types are given if the user wishes to expand the tests.

Remarks


Tested By


Witnessed By


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Documents

7UT612 Procedure