Trafo Test Report
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Transcript of Trafo Test Report
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
-- -
- - -
--
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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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