2 A 50 Hz 80 Kva 11 000 415 V A Y Connected Three Phase Distribution Transformer Produced The Following Test Result 1 (83.06 KiB) Viewed 60 times
2. A 50 Hz, 80 kVA, 11 000/415 V, A-Y connected, three-phase distribution transformer produced the following test results. Open circuit test: Test was performed on the low voltage side of this transformer, and the following data recorded: Voc = 415 V loc = 3.90 A Poc = 900 W Short circuit test: Test was performed on the high voltage side of this transformer, and the following data recorded. Vsc = 900 V Isc = 4.2 A Psc = 1230 W Using this information, answer the following questions: 2.1 Determine the parameters of the equivalent circuit, referred to the high voltage side and draw the equivalent circuit of this transformer. 2.2 Determine the voltage regulation at the rated load and 0.8 p.f. lagging referred to the primary side. For this you must calculate the no-load primary voltage, using the approximate equivalent circuit referred to the primary side. Repeat your calculation for the following transformer loadings and fill the table below. Use the no-load voltage for the rated load to calculate the loaded voltage a.Vos for each loading. Loading(%) 10 20 30 40 50 60 70 TO 80 80 90 100 VR(%) Sketch the characteristic showing the variation of voltage regulation versus transformer loading. Discuss your results.
2.3 Determine the transformer efficiency at rated load and 0.8 p.f. lagging. Repeat your calculation for the following transformer loadings and fill the table below: Loading(%) 10 20 30 40 50 60 70 80 90 100 Efficiency(%) Sketch the characteristic showing the variation of efficiency versus transformer loading. Also show at what percentage loading the maximum efficiency will occur. Discuss your results.
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