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07-02-2024
Physics

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Two 13.8kV, 3phase generators of ratings 50 MVA and 25 MVA and reactances 25% and 20% respectively are connected to a common busbar. The busbar is connected to a 75-MVA, 13.8/66-kV, 3-phase transformer having reactance of 20% to supply load. the generators are initially operating on no load and at rated terminals voltage. A 3-phase symmetrical fault occurs on the high-voltage terminals of the transformer. [Show working using per-unit method]

a. Find the fault current supplied by the high-voltage side of the transformer?

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