A 3 phase, 50 Hz, 50 MVA, 11 kV, alternator has a solidly grounded neutral with zero, positive, negative sequence reactance's of j0.05 p.u , jo.2 p.u and j0.12 p.u respectively. It is desired to limit the double line to ground fault current to 75% of three phase fault current. Calculate the ohmic value of reactance that must be placed between the alternator neutral and ground.

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A 3 phase, 50 Hz, 50 MVA, 11 kV, alternator has a solidly grounded neutral with zero, positive, negative
sequence reactance's of j0.05 p.u , j0.2 p.u and j0.12 p.u respectively. It is desired to limit the double line to
ground fault current to 75% of three phase fault current. Calculate the ohmic value of reactance that must be
placed between the alternator neutral and ground.
Transcribed Image Text:A 3 phase, 50 Hz, 50 MVA, 11 kV, alternator has a solidly grounded neutral with zero, positive, negative sequence reactance's of j0.05 p.u , j0.2 p.u and j0.12 p.u respectively. It is desired to limit the double line to ground fault current to 75% of three phase fault current. Calculate the ohmic value of reactance that must be placed between the alternator neutral and ground.
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