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Fault Location for Phase to Phase Fault

Fault Location for Phase to Phase Fault

Fault Location for Phase to Phase Fault

(OP)
When calculating the fault impedance for a C-A phase fault I am taking Vca/Ica to get Zca ( I am also assuming zero fault resistance). Is that the total loop impedance or is that the one way impedance to the fault? It seems to be the loop impedance to me but from what sources I have read they all imply it is the one way impedance.

RE: Fault Location for Phase to Phase Fault

ZT = TOTAL IMPENDANCE

VA = VC - IC*ZT
VC = VA - IA*ZT

VA - VC = (VC-VA) - (IC-IA)*ZT

2*(VA-VC) = -(IC-IA)*ZT

2*(VA-VC) = (IA-IC)*ZT

2*(VA-VC)/(IA-IC) = ZT

VAC/IAC = ZT/2

ZT/2 = half of the total loop impedance

RE: Fault Location for Phase to Phase Fault

(OP)
Thank you for the clarification I understand now.

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