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

QUESTION

A 60-Hz turbogeneralor 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 Xd'' = X1 = X2 = 0.15 and Xo = 0.05 per
unit. Find the ratio of the sub transient line current for a single line-to-ground
fault to the sub transient line current for a symmetrical three-phase fault.

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