1) A 15 kVA, 2300/230 V transformer is tested to determine its series impedances

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1) A 15 kVA, 2300/230 V transformer is tested to determine its series impedances. The following test data have been taken from the primary side of the transformer during the short circuit test. Vsc= 100V, Isc=2A, Psc=20W. Determine Xeq referred to the low voltage side.

1. A 15 kVA, 2300/230 V transformer is tested to determine its excitation branch components. The following test data have been taken from the primary side of the transformer during the open circuit test. Voc= 2300V, Ioc=0.3A, Poc=600W. Determine Xm referred to the low voltage side.
2. A 25 kVA, 2300/230 V transformer is tested to determine its efficiency. The following data have determined. Eequivalent resistance referred to its secondary side Req=0.1 Ohm, secondary power factor 0.85, core losses Pc=50 W. Calculate the efficiency of the transformer.
3. A 15 kVA, 2300/230 V transformer is tested to determine its series impedances. The following test data have been taken from the primary side of the transformer during the short circuit test. Vsc= 100V, Isc=4A, Psc=40W. Determine Req referred to the low voltage side.
4. A 15 kVA, 2300/230 V transformer is tested to determine its excitation branch components. The following test data have been taken from the primary side of the transformer during the open circuit test. Voc= 2300V, Ioc=0.4A, Poc=800W. Determine Rc referred to the low voltage side.