A 15 kVA, 2300/230 volt transformer is under test. With the low side supplied with rated voltage and the high side open circuited, input power through a wattmeter reads 245 W. With the high side supplied with 65 V while the low side short circuited, input power at rated current reads 350 W. Determine the maximum efficiency that can be expected from this transformer at unity pf.

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Following are the results of a test carried out on a 230/600 V single phase, 7.5 kVA transformer.   O.C. Test : 230 V, 1.2 A, 280 W, on L.V side   S.C. Test : LV winding is shorted. 26 V, 11A, 155 W, H.V.  Both the full load efficiency and full load regulation of the transformer on the side are 0.8 lagging p.f Search on.

1. A 1000-VA 350/140-V transformer has been tested to determine its equivalent circuit. The results of the tests are shown below. Open-circuit test Short-circuit test Voc = 235 V Vsc = 20.1 V loc = 0.57 A Isc = 9.6 A Poc = 34.3 w Psc = 42.7 W All data given were taken from the primary side of the transformer. Evaluate the equivalent circuit of this transformer referred to the low-voltage side of the transformer.