A fault occurs in the R phase of a solidly grounded unloaded alternator. The fault current IR1 and neutral current I are given

1
\({I_{R1}} = \frac{{{E_a}}}{{{Z_1} + {Z_2} + {Z_0}}}\;and\;{I_N} = {I_{a0}}\)
2
\({I_{R1}} = \frac{{{E_a}}}{{{Z_1} + {Z_2}}}\;and\;{I_N} = 2{I_{a0}}\)
3
\({I_{R1}} = \frac{{{E_a}}}{{{Z_1} + {Z_2} + {Z_0}}}\;and\;{I_N} = 3{I_{a0}}\)
4
\({I_{R1}} = \frac{{{E_a}}}{{{Z_1} + {Z_2} + {Z_0}}}\;and\;{I_N} = 0\)

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