CT Location on Outgoing MV Feeder Breaker
CT Location on Outgoing MV Feeder Breaker
(OP)
In MV metal-clad switchgear, are the CT's for a 50/51 relay on an outgoing feeder breaker usually located on the line side or load side of the feeder breaker? What is the most common practice and why? 





RE: CT Location on Outgoing MV Feeder Breaker
RE: CT Location on Outgoing MV Feeder Breaker
David, I think it was some missunderstanding.
As fa5r, as I know, CT location in MV metal-clad SWG is always bottom section, line side, after ES.
Best Regards.
Slava
RE: CT Location on Outgoing MV Feeder Breaker
RE: CT Location on Outgoing MV Feeder Breaker
Good to know,
Best Regards.
Slava
RE: CT Location on Outgoing MV Feeder Breaker
RE: CT Location on Outgoing MV Feeder Breaker
1. Because it is very convenient to install CTs around the insulating bushings which are already there to accept breaker stabs. This even allows low voltage (600V)CTs to be used as the insulation to the bus is provided by the bushings.
2. Usually the load sides will be cables and it is very inconvenient to install CTs around them, plus you end up with a portion of the cable and breaker load terminals outside the protection zone. That is not desirable.
RE: CT Location on Outgoing MV Feeder Breaker