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What IEEE80 Split Factor Curve to Use

What IEEE80 Split Factor Curve to Use

What IEEE80 Split Factor Curve to Use

(OP)
Hello,

Some info is in order first I suppose.  I have a substation, fed via a 34.5kV (3 wire) line.  Transformer is 34.5/7.2kV Delta/Gnd-Wye.  The fault current is 2kA on the 34.5kV side.  Rg=2.8ohms  This sub is also tied to the 34.5kV source sub via two 7.2kV (4 wire) distribution lines.

Now I get lost at determining which IEEE80 Appendix C split current curve to use here.  I don't see much in any searches on this subject.  Would I use the curves for 100% remote source and 0 transmission lines and 2 feeders?

Thank you,

RE: What IEEE80 Split Factor Curve to Use

Brian,
  I run into this issue quite a lot.  You are correct to use zero transmission lines and 2 feeders.  Even for a HV fault, the feeder nuetrals will help.

You should also consider a low side fault outside the substation.  I've seen a few cases where this is actually worst case.  Depends on how much you want to dive in.

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