Question

A 100MVA, 13KV, 3-phase generator has $Z_{g1} = Z_{g2} = j0.2 p.u$ and $Z_{go} = j0.05$. The generator is solidly grounded, operating at no-load, and at rated voltage at the occurrence of fault. Take 100MVA, 13KV as base values and the no-load voltage of phase a as reference. The fault takes place at the terminals of the generator. Answer questions (1-4): 1. For line to ground fault on phase a, the fault current in phase a, in A, is: 2. For line to ground fault on phase a, the phase voltage in phase b, in V, is: 3. For the a line to ground fault on phase a and if the generator neutral is isolated from ground, the phase voltage of phase a, in V, is: 4. For a line to line fault between phases b and c, and if $Z_f = \infty$ and $Z_n = 0$, the fault current in phase b, in A, is:

          A 100MVA, 13KV, 3-phase generator has $Z_{g1} = Z_{g2} = j0.2 p.u$ and $Z_{go} = j0.05$. The generator is
solidly grounded, operating at no-load, and at rated voltage at the occurrence of fault. Take 100MVA,
13KV as base values and the no-load voltage of phase a as reference. The fault takes place at the
terminals of the generator. Answer questions (1-4):
1. For line to ground fault on phase a, the fault current in phase a, in A, is:
2. For line to ground fault on phase a, the phase voltage in phase b, in V, is:
3. For the a line to ground fault on phase a and if the generator neutral is isolated from ground,
the phase voltage of phase a, in V, is:
4. For a line to line fault between phases b and c, and if $Z_f = \infty$ and $Z_n = 0$, the fault current
in phase b, in A, is:

A 100MVA, 13KV, 3-phase generator has Zg1 = Zg2 = j0.2 p.u and Zgo = j0.05. The generator is
solidly grounded, operating at no-load, and at rated voltage at the occurrence of fault. Take 100MVA,
13KV as base values and the no-load voltage of phase a as reference. The fault takes place at the
terminals of the generator. Answer questions (1-4):
1. For line to ground fault on phase a, the fault current in phase a, in A, is:
2. For line to ground fault on phase a, the phase voltage in phase b, in V, is:
3. For the a line to ground fault on phase a and if the generator neutral is isolated from ground,
the phase voltage of phase a, in V, is:
4. For a line to line fault between phases b and c, and if Zf = ∞ and Zn = 0, the fault current
in phase b, in A, is:

Added by Andrew S.

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