Electrical Engineering > GATE 2018 > Fault Analysis
The positive, negative and zero sequence impedances of a three phase generator are Z1, Z2, and Z0 respectively. For a line-to-line fault with fault impedance Zf, the fault current is If1 = kIf, where If is the fault current with zero fault impedance. The relation between Zf and k is
A
Zf = (Z1 + Z2)(1 - k) / k
B
Zf = (Z1 + Z2)(1 + k) / k
C
Zf = (Z1 + Z2)k / 1 - k
D
Zf = (Z1 + Z2)k / 1 + k

Correct : a

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