Expression for current - Double Line to Ground Fault

Q.  What is the expression for the current Ia2, if a double line to ground fault occurs on an unloaded generator through fault impedance?
- Published on 19 Oct 15

a. Ia2 = - Ia1 * (Z0 + 3Zf) / ( Z0 + Z2 + 3Zf)
b. Ia2 = - Ia1 * (Z0 + 3Zf + Z2) / ( Z0 + Z2 + 3Zf)
c. Ia2 = - Ia0 * (Z0 + Zf) / ( Z0 + Z2 + 3Zf)
d. Ia2 = - Ia1 * Z2 * (Z0 + 3Zf) / ( Z0 + Z2 + 3Zf)

ANSWER: Ia2 = - Ia1 * (Z0 + 3Zf) / ( Z0 + Z2 + 3Zf)

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