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X/R ratio for single phase to ground fault

X/R ratio for single phase to ground fault

X/R ratio for single phase to ground fault

(OP)
Hi,

I know that we use X1/R1 for X/R ratio in case of three phase fault. I want to know what will be the X/R ratio for single phase to ground fault?

Can I use (X1+X2+X0)/(R1+R2+R0)?

Regards,

musa UKPN

RE: X/R ratio for single phase to ground fault

Yes, the equation you have is based on the interconnection of the 3 sequence networks for a single line to ground fault and will result in the equivalent X/R ratio for this condition.

RE: X/R ratio for single phase to ground fault

I'd say that would be correct. What are you using the result for? Is it to determine thermal equivalent current for the fault?

RE: X/R ratio for single phase to ground fault

If you are using it to compute duty of ANSI rated circuit breakers you actually have to calculate the X using an X only network and the R using an R only network.

RE: X/R ratio for single phase to ground fault

(OP)
Many thanks for your valuable comments.

musa UKPN

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