132 Testing - Power Transformer

132/33 kV Transformer Bay at Lamki S/S

FIELD TEST REPORT OF POWER TRANSFORMER Test Date:

1. Equipment Detail Equipment Circuit Position Manufacturer Serial No Vector Group Type of Cooling Rated Power

: 132/33 kV Power Transformer : 132/33 kV Transformer Bay : : : : :

1.1 General check SN 1 2 3 4 5 6

7

Test Items Inspection Secondary Wiring Tightness Equipment and Structure Earthing

Results

Remarks

Ratio Selection Spare Core

As per NEA requirement All spare core are short circuited

Polarity Oil leakage Oil Level

Between Min and Max position

1.2 Insulation Resistance Test Connection

IR Value (5000V) M - 1 Min

IR Value (5000V) M - 3 Min

Remarks

Reading - 1

Reading -2

Average

HV-E HV-LV LV-E

1.3 BDV Test Sample Top Bottom

1.4 Turn Ratio Tester Tap no. Primary Voltage Actual Ratio Observed Ratio Percentage Error 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Remarks

Field Test Report of 132 kV Power Transformer

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132/33 kV Transformer Bay at Lamki S/S

1.5 Vector Group Test Test Items Measured Voltage Verifying condition Result 1V-2V 1W-2W Ok 1V-2W 1W-2V Power Transformer Vector Group Testing (YNyn0) : R-r Shorted Tap position = 9 , three phase voltage applied on the primary side.

R

R

Y

B

N

r

y

b

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

Y B N r y

X

b n 1.6 Short Circuit Test R-Y-B-N Supplied and r-y-b-n shorted Tap Position 1

Primary Current R= Y= B= N=

Primary Voltage R–N= Y–N= B–N=

Secondary Current r= y= b= n=

9

R= Y= B= N=

R–N= Y–N= B–N=

r= y= b= n=

17

R= Y= B= N=

R–N= Y–N= B–N=

r= y= b= n=

Remarks

Field Test Report of 132 kV Power Transformer

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132/33 kV Transformer Bay at Lamki S/S

1.7 Winding Temperature Setting S.N 1 2 3 4

Test Item Setting Fan – Group -1 Fan – Group -2 Alarm Trip

Remarks

1.8 Oil Temperature Setting S.N Test Item 1 Alarm 2 Trip

Setting

Remarks

1.9 Bushing Current Transformer Phase Ratio

HV Side Ratio Measured Polarity

Remark

Ratio

Ratio Measured

LV Side Polarity

Remark

R Y B N

Phase r y b n

Tested by:

…………………… HTSG

Witnessed by:

………………... Nepal Electricity Authority

Field Test Report of 132 kV Power Transformer

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