Short circuit current
Short circuit current
(OP)
In a substation 132/33/11kV, the SC rating of 33kV CB (MOCBs) is 31.5kA. The client is being proposed replacement with vacuum CBs rated 25kA considering the fact that the neutral point on the 33kV side is isolated and grounded by 17 Ohm reactor.
Is it advisable to use the 25kA CB instead of the required 31.5kA.
Thanks in advance for your expert comments.
Is it advisable to use the 25kA CB instead of the required 31.5kA.
Thanks in advance for your expert comments.






RE: Short circuit current
Alan
Democracy is two wolves and a sheep deciding what to have for dinner. Liberty is a well armed sheep!
Ben Franklin
RE: Short circuit current
Izn't correct from your client side.
What Alan saied, 3-ph bolted fault for eq. choice, not single phase fault.
Best Regards.
Slava
RE: Short circuit current