Thursday, 26 October 2023
Transformer ratio test magnetic voltage
Transformer Test Typical
Transformer no --------------------- Rating 500 KVA, 11/0.415KV
apply voltage 415 V primary side and observe the voltage in secondary side-
A) Magnetic voltage balance test
sr. phases measured voltage
1U-1V 1V-1W 1W-1U 2U-2N 2V-2N 2W-2N 2U2V 2V2W 2W2U
1 R-phase open 178 362 183 3.9 7.9 3.8 11.7 11.8 0.1
2 Y-phase open 70 207 360 7.9 6.1 1.4 14.2 4.6 9.5
3 B-phase open 364 201 81 1.6 6.0 7.9 4.5 13.9 9.5
B) VOLTAGE RATIO TEST
SR. APPLIED VOLTAGE
tap position 1U-1V 1V-1W 1W-1U 2U-2V 2V-2W 2W2U 2U-2N 2V-2N 2W-2N
1 1 366 368 362 12.91 13.12 13.00 7.39 7.54 7.54
2 2 366 365 357 13.24 13.43 13.30 7.61 7.73 7.72
3 3 365 365 364 13.61 13.60 13.62 7.84 7.85 7.84
4 4 366 368 364 13.96 14.07 14.00 8.03 8.10 8.10
5 5 366 367 363 14.26 14.36 14.34 8.21 8.28 8.28
6 6 366 367 362 14.66 14.79 14.72 8.43 8.50 8.48
C) INSULATION RESISTANCE MEASUREMENT
SR. Main winding Meger volt (DC) IR value m-ohm Remarks
1 HV to earth 2500 0 1min
2 LV to earth 500 1
3 HV to LV 500 1.5 1 min
D) Oil BDV Test : 9.8 KV
conclusion : oil filteration
FORMAT
Date: ___________
Transformer Test
Test report : _______________________________________________________________
Location: _______________________________________________________________
Capacity of Transformer: _______________________________________________________________
Input voltage HT side: _______________________________________________________________
Vector Group: _______________________________________________________________
Tested By: _______________________________________________________________
Work Order No.: _______________________________________________________________
A) MAGNETIC VOLTAGE BALANCE TEST
sr. Phases Measured Voltage
1 2 3 4 5 6 7 8 9
1U-1V 1V-1W 1W-1U 2U-2N 2V-2N 2W-2N 2U-2V 2V-2W 2W-2U
1 R-phase open
2 Y-phase open
3 B-phase open
Remarks
B) VOLTAGE RATIO TEST
APPLIED VOLTAGE
SR. Tap position 1U-1V 1V-1W 1W-1U 2U-2V 2V-2W 2W-2U 2U-2N 2V-2N 2W-2N
1 1
2 2
3 3
4 4
5 5
Remarks
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