Quick Question someone asked me .....
If a source phase is lost on an oil filled three phase transformer (NO LOAD CONNECTED), will this eventually damage the transformer?
I say no, the transformer can remain energized indefinately with no concerns
We have a 1986 vintage Westinghouse 2000KVA 23kV-480V 65 deg C rise transformer showing some interesting characteristics under a thermal inspection (please note there are no oil analysis or service issues):
1. An entire bank of cooling fins appear clogged/disconnected. How is this possible...
IQuestion converting an ungrounded delta system to a HRG setup, understanding the advantages has to offer:
Existing System: 23kV delta / 480V delta (ungrounded) 2000KVA transformer - 3 wire secondary bus - 3 wire 2500A 600V switchboard with GF indicating lights. All motor/xfmr loads.
1...
Industrial location. 3 phase 480V delta source - 25A Fused Disc (in a remote location, capable of being locked out) feeds a 15KVA delta-whye drive isolation xfmr (18FLA) (#10 wire). The secondary of this xfmr immediately feeds a 10hp VSD (within 10 feet), which in turn supplies the 10hp motor...
