1.Evaluate (1 + a) / (1 + a^2) 2. A generator having a solidly grounded neutral...

1.Evaluate (1 + a) / (1 + a^2)

2. A generator having a solidly grounded neutral and rated 50 MVA, 30 kV has a positive, negative and zero sequence reactances of 20, 20 and 5 percent respectively. What reactance must be place in the generator neutral to limit the fault current or a bolted single line to ground fault to that for a bolted three phase fault?

3. The positive, negative and zero sequence reactances of a 15 MVA, 11 kV three-phase wyeconnected generator are 11%, 8% and 3% respectively. The neutral of the generator is grounded and is excited to the rated voltage on open circuit. A line to ground fault occurs on phase a of the generator. Calculate the fault current.

Expert Solution

Manojponduru answered 2 months ago

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