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What is the formula for finding fault level of generator?
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Answer Posted / ramesh
I would like to answer by way of an example:
Generator capacity = 12MVA
Generator sub-transient impedance = 12%
With above two data,
the generator fault level can be calculated as folows:
Generator fault level = Generator capacity / generator sub-
transient impedance
Generator fault level = 12 MVA / 12% = 12MVA/.12 = 100MVA
To get fault current = Generator fault MVA / (1.732 *
generator rated voltage)
In case of single phase generator 1.732 to be ignored.
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