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For carrying Short Circuit Test on Power Transformer Do the following:

1] Isolate the Power Transformer from service.

2] Remove HV/LV Jumps and Disconnect Neutral from Earth/Ground.

3] Short LV Phases by Cu/Al plate which could withstand short circuit current and connect these short circuited terminals to Neutral

4] Energise HV side by LV supply (440 3ph Supply) with OLTC tap position on Normal.

5] Measure Current in Neutral, LV line voltages, HV Volatage and HV Line Currents on various OLTC Tap position.

Analysis:

If Neutral current is near to zero transformer windings are OK

If Neutral current is higher or equal to Line current between LV Phase one of the winding is Open.

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Kenya Carter

Lvl 10
2y ago

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If you take a power source like a dc battery or AC transformer secondary winding and connect an ammeter directly across these power sources you can read the short circuit current available from that source. This gives a measure of internal resistance of the battery or the available wattage of the transformer.


How do you carry out short circuit test on power transformers?

For carrying Short Circuit Test on Power Transformer Do the following: 1] Isolate the Power Transformer from service. 2] Remove HV/LV Jumps and Disconnect Neutral from Earth/Ground. 3] Short LV Phases by Cu/Al plate which could withstand short circuit current and connect these short circuited terminals to Neutral 4] Energise HV side by LV supply (440 3ph Supply) with OLTC tap position on Normal. 5] Measure Current in Neutral, LV line voltages, HV Volatage and HV Line Currents on various OLTC Tap position. Analysis: If Neutral current is near to zero transformer windings are OK If Neutral current is higher or equal to Line current between LV Phase one of the winding is Open.


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