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

SOP for pest control or disinfestation in substation and switchgear rooms

1. OBJECTIVE a) To prevent the entry of lizards, rodents, and other pests inside electrical substations, MCC rooms, UPS rooms, battery rooms...