Drawing Impedance Diagrams
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A 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA. Determine the system fault kVA and the fault currents at the 415 V and 110 V busbars for short circuit faults on the transformer input or output terminals. Work in p.u. values of impedances.
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Solution Summary
The expert examines drawing impedance diagrams for circuit faults. The values of impedances are determined.
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A 16 kW, 415 V, 0.8 pf 3-phase generator (X = 20%) is supplying a 5 kVA, 3-phase 415/110 V transformer (X = 8%). Draw the individual and combined impedance diagrams to a base of 10 kVA. Determine the system fault kVA and the fault currents at the 415 V and 110 V busbars for short circuit faults on the transformer input or output terminals. Work in p.u. values of impedances.
Solution:
G 16 kW, 415 V, 0.8 pf, 3 phase (X = 20%)
415 V Bus
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