SAT REPORT TRANSFORMER – ABB 11kV/415V substation

Transformer Site Acceptance Test:

Name Plate Details:

Manufacturer

Sl.No

Year of Manufacture

Rating KVA

No. of Phases

Type

Type of Cooling

Frequency (Hz)

Rated Voltage (kV)- HV/LV

Impedance voltage @ 750C (%)

Amp. Temp. 0C

Temperature Rise Oil/Winding 0C

Vector Group Symbol

Rated Current (A)- HV/LV

Oil Quantity (L)

Untaking Mass (kg)

Total Weight (Kg)

Switch Position Connect HV Volts12345

1) Visual Check:

Sl.No Description Remarks

1 Check level and alignment of installed transformer;

2 Check tightness of connections and fastenings

3 Check proper grounding

4 Check wire and cable connections

5 Check cable glands and entrance

6 Check Oil Level

7 Check Marshalling box inspection for cable connection

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SAT REPORT TRANSFORMER – ABB 11kV/415V substation

2) Insulation Resistance Test:

Winding Voltage Insulation Resistance (Ω) Remarks

Ref (V) 1min 10min PI Value

HV to Earth 5000

HV to LV 2500

LV to Earth 1000

PI – Polarisation IndexPI = R10 / R1 (dimensionless)

Where,R10 – Resistance at 10th min

R1- Resistance at 1st min

3) Winding Resistance Test:

a) H.V Side

TapsResistance (Ω)

Remarks1U-1V 1V-1W 1W-1U

1

2

3

4

5

c) L.V Side

TapResistance (mΩ)

Remarks2u-2v 2v-2w 2w-2u 2u-2n 2v-2n 2w-2n

3

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SAT REPORT TRANSFORMER – ABB 11kV/415V substation

4) Magnetizing Current Test:

Tap NoPry. Applied Voltage Magnetizing Current in mA

RemarksRY YB BR R Y B

1

2

3

4

5

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SAT REPORT TRANSFORMER – ABB 11kV/415V substation

5) Magnetic Core Balance test:

Applied Voltage Measured Voltage Remarks

r-n y-n b-n r-n y-n b-n

-- -

- - -

--

-

6) Vector Group Test:

Applied Voltage Measured Voltage Remarks

(V) (V)

1U-1V 1U-2u

1V-1W 1U-2v

1W-1U 1U-2W

Condition: ( for Dyn11) 1V-2u

1W2w <1W2v 1V-2v

1V2v=1V2w 1V-2W

1U2n+1V2n=1U1V 1W-2u

1W-2v

1W-2W

1U-2n

1V-2n

1W-2n

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SAT REPORT TRANSFORMER – ABB 11kV/415V substation

7) Turns Ratio Test:

Tap

Applied Voltage (V)

Measured Voltage (V)

Expected Actual Ratio Error

Remarks

1U-1

V

1V-1

W

1W-1

U

2u-2

v

2v-2

w

2w-2

u

2u-2

n

2v-2

n

2w-2

n

1

2

3

4

5

8) Transformer function Test (Aux equipments):

Sr.No Function YES / NO Remarks

1 NCT Sec. terminal connected to SBEF relay

2Shorting link removed after CT loop is closed through SBEF Relay

3 Test Auxiliary circuit

9) Calibration Test: (Simulation)

Winding Temperature Indicator

Ref: Expected Setting in Indicator Actual setting received in Marshalling Box Remarks

Alarm

Trip

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SAT REPORT TRANSFORMER – ABB 11kV/415V substation

10) Neutral CT Test:

Name Plate Details

Make and type

CT serial number

Ratio

Accuracy / class

Core designation

Burden

Result:

a) Insulation Resistance Test

PhaseApplied Megger Voltage

for 1MinMeasured values in Ω

RemarksNCT

P-E 1000P-S 1000S-E 500

b) Polarity Test

Ref NCT Remarks

1S1-1S2

c) Winding Resistance Test

RefMeasured values in Ω

RemarksNCT

1S1-1S2

d) MAGNETIZING CHARACTERISTICS TEST OF CT:

As per the attachment

e) Ratio Test:

Primary Current in Amps Sec. current in Amps

25% 50% 75% 100% 25% 50% 75% 100%

EXEPCTED

ACTUAL

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SAT REPORT TRANSFORMER – ABB 11kV/415V substation

Tripping CB through SBEF relay

SNAG LIST:

TEST EQUIPMENT DETAILS:

Sl. No Description Make Model Serial No Calibration Due

01

02

03

04

Tested By Witnessed By Witnessed By Witnessed By Approved By

COMPANY SPACEAGE

NAME

SIGNATURE

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SAT REPORT TRANSFORMER – ABB 11kV/415V substation

DATE

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