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Q#1 Fault Analysis GATE EE 2001 MSQ +2 marks -0 marks

A single line-to-ground fault occurs on an unloaded generator in phase a positive, negative, and zero sequence impedances of the generator are j0.25p.u, j0.25p.u, and j0.15p.u. respectively. The generator neutral is grounded through a reactance of j0.05p.u.  The pre fault generator terminal voltage is 1.0p.u.

The positive, negative, and zero sequence networks for the fault given are
Positive sequence diagram:

Untitled-9.png

Negative sequence diagram:

Untitled-10.png

Zero sequence diagram:

Untitled-11.png

Interconnection of the sequence networks for the fault analysis
Untitled-12.png

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