A 200 kVA transformer has a 10KV primary and 240V centre-tapped secondary (2 x 1

Question

A 200 kVA transformer has a 10KV primary and 240V centre-tapped secondary (2 x 120 V).

A set of open circuit test and short circuit test have been performed on the transformer.

Open Circuit test- supply to secondary:
Poc 1.2 kW
Voc 240 V
Io 20.0 A

Short Circuit test - supply to primary:
Psc 3.5 kW
Vsc 720 V
Isc 11 A

Q: At what percentage of full load does maximum efficiency occur?

Two things about this question made me wonder if I had to do anything different. 1) the centre tapped secondary. 2) the notes after each test. i.e. Open Circuit test - supply to secondary and Short Circuit test - supply to primary.

Explanation / Answer

1) the centre tapped secondary.

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