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A 60-Hz turbogenerator is rated 500 MVA, 22 kV. It is Y-connected and solidly grounded and...

A 60-Hz turbogenerator is rated 500 MVA, 22 kV. It is Y-connected and solidly
grounded and is operating at rated voltage at no load. It is disconnected from the
rest of the system. Its reactances are given below.
X'' = X1 = X2 =0.15pu, and X0 = 0.05pu

a ) Find the ratio of the subtransient line current for a single line-to-neutral fault to
the subtransient line current for a symmetrical three-phase fault.
b ) Determine the inductive reactance in ohms to be inserted in the neutral
connection of the generator to limit the subtransient line current for a single line to-
neutral fault to that of a three-phase fault.

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