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Short Circuit Testing

Short Circuit Testing

Short Circuit Testing

(OP)
A field person asked me this question and I couldn't find the document to justify, so we need your help.  Given a 3-phase transmission line with length (L)and all three phases are shorted, what is the 3-phase voltage need to apply in the other end to achieve an "X" Amp Line-Ground Current for each  phase?  If you have any link relates to the above subject would be great.  Thank you.

RE: Short Circuit Testing

If all three phases are shorted and you apply three-phase voltage, you have a three-phase fault and there is no line-to-ground current.  

RE: Short Circuit Testing

This sounds like sequence impedance testing, where, if I remember correctly, the three phases are shorted to ground at one end, and the same voltage is applied between all three and ground at the other end. The current is measured and the impedance is calculated.

RE: Short Circuit Testing

DanDel,

That would be a test to measure 3Io, right?

Thanks,

JB

RE: Short Circuit Testing

I think so. I remember reading the procedures for field testing both zero and positive sequence impedances, but can't remember the specifics.

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