138kV bus diff protection
138kV bus diff protection
(OP)
I've seen these take the CT inputs as well as breaker a/b contact input. But i've also seen them jsut taking the CT input.
Can someone explain when do you need the breaker open/close input? and why?
Can someone explain when do you need the breaker open/close input? and why?






RE: 138kV bus diff protection
RE: 138kV bus diff protection
RE: 138kV bus diff protection
What are you doing or is being done?
RE: 138kV bus diff protection
thanks for the replies.
It is actually, a simple project. I am just adding a "B" bus protection so I guess i can just follow what they've done with the "A" protection I just wanted to understand why. I remember when i was first starting as a P&C designer they always said to me that you grab the status of anything you have to trip or open. But in this sub not only do they not have any of the inputs but it looks like they were taken out from the "A" protection during the last revision (judging by the revision clouds, but i can't be sure of that).
it is a GE-B30 87 bus prot (see attached)
RE: 138kV bus diff protection