zig zag grounding TX sizing
zig zag grounding TX sizing
(OP)
I have three 600V 500kW 3phase generators connected to a 3ph 4w bus and want to provide a zig zag transformer with resistor to get a grounded neutral at the bus. The max. ground fault current allowed is 5A. Please advise me on how to size the TX and resistor. Thank you.






RE: zig zag grounding TX sizing
Just curious: Are the generator windings delta connected?
If wye connected, then can you not ground the generator neutrals through a high resistance?
RE: zig zag grounding TX sizing
You also need to specify any continuous rating required due to 3rd harmonic currents.
You say you have a 3 phase, 4 wire system. I'm not sure how this is possible if you don't presently have a grounded system. I assume you're aware that if you ground through a resistor, you cannot have any line-to-neutral loads, and will essentially be limited to a 3-phase, 3-wire system.
RE: zig zag grounding TX sizing
Sorry for pitching in here:
To DPC comments:
"What continous rating has to do with 3rd harmonic currents".
I would appreciate a word, looks like my concept is a little astry.
Thanks
RE: zig zag grounding TX sizing