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4. Figure shows a power source that feeds a 100 kVA 14/2.4 kV transformer through a feeder with impedance of 100/60° Ω Load 90 kw 0.85 PF lagging Feeder transmission line) Source Transformer Load The transformer has been tested to determine its equivalent circuit. The results of the tests are: Open-circuit test Voc = 14 kV oc 0.1 A Рос-800 w Short-circuit test Vsc 800 V Isc = 7A Psc 2 kW The load on the transformer is 90 kW at 0.85 pf. and 2300 V What is the voltage at the power source of the system? What is the voltage regulation of the transformer? a. b. Page 1 C. How efficient is the overall power system? [Result: Vrce14.5/4.3° kV]

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Determine the tums ratio, a of the transformer V] 14 kV 2.4 kV - 5.833 Determine the short circuit impedance angle from the sThe feeder impedance referred to secondary side is, 2400 ine14000 (100260°) -1.47+12545 Ω The second current i8, 90000 L-cos2300(46.032-31.78 - 2423+ j93.657 1.2+ j3.137) 2424.8/2.21° V Now calculate the voltage regulation of the transformer VR 2424

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