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,
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
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.