transky
Electrical
- Nov 16, 2010
- 3
Hello every one,
Just wondering if anyone has seen 50/5 C10 zero-sequence CTs on a solidly-grounded medium voltage switchgear and MCC feeders? I am worried about the CT saturation in the event of ground fault, and burning the relay CT input coils since I have a ground fault current of about 30kA. I would like to replace them with bigger zero-sequence CTs, say 500/5 C100, instead of using residual connection of phase CTs or relay internally calculated Io current.
Is this the right way to go?
For the switchgear feeders I will be using GE ITI 143 ZSCTs they appear to fit with out any problem.
But, I am having trouble in finding an appropriate ZSCT of higher rating which can fit into MV MCC buckets. Any suggestions on style and make are appreciated.
Thanks.
Just wondering if anyone has seen 50/5 C10 zero-sequence CTs on a solidly-grounded medium voltage switchgear and MCC feeders? I am worried about the CT saturation in the event of ground fault, and burning the relay CT input coils since I have a ground fault current of about 30kA. I would like to replace them with bigger zero-sequence CTs, say 500/5 C100, instead of using residual connection of phase CTs or relay internally calculated Io current.
Is this the right way to go?
For the switchgear feeders I will be using GE ITI 143 ZSCTs they appear to fit with out any problem.
But, I am having trouble in finding an appropriate ZSCT of higher rating which can fit into MV MCC buckets. Any suggestions on style and make are appreciated.
Thanks.