ANSI 87T requirement
ANSI 87T requirement
(OP)
On what rating should transformer must have 87T protection, any standard reference should be follow?
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RE: ANSI 87T requirement
RE: ANSI 87T requirement
RE: ANSI 87T requirement
RE: ANSI 87T requirement
Of course this assumes a non secondary selective scheme, and a fast (3-cycle) primary CB.
"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)
RE: ANSI 87T requirement
If you are buying a transformer, why not also buy it with CT's installed if you can.
Other thing to think about is what happens if a transformer develops a fault. Would you have it rewound, or replace it with a new one. If the answer is to scrap it, then it does not matter if it is slightly damaged, or a smoking mass. If the intent is to repair it, then the fastest protection (differential) is a given.