PROBLEM
A three-phase generator
rated 25 MVA, 13.2 kV has a solidly grounded neutral. It's positive, negative
and zero sequence impedances are 30%, 40%, and 5% respectively. Resistances are
negligible.
(i) What value of reactance
must be placed in the generator neutral so that the fault current for a line to
a ground fault of zero fault impedance shall not exceed the rated line current?
(ii) What value of
resistance in the neutral will serve the same purpose?
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