Cooper Single Phase Transformers
Cooper Single Phase Transformers
(OP)
Recently we received quite a few Cooper 997kva 7200-277 single phase transformers, for use in some of our larger customer subs. Some have been installed, and when IR scanned, they show excessive heat( 300f) right between the secondary bushings. In this exact area between the bushings, and on the opposite side between the primary bushings is a 'grounding pad" with threaded holes. The transformers are all case grounded via the grounding pad at the base of each unit.
Question, could these pads between the bushings actually be core grounding points?
Nothing like this is referenced on any leaflet for these units, and although Cooper has been contacted, I was hoping to get some opinions or guidance from you gentleman.
If I have left out any information, please let me know.
I have included an IR scan of the unit while energized.
Regards,
OT2020
Question, could these pads between the bushings actually be core grounding points?
Nothing like this is referenced on any leaflet for these units, and although Cooper has been contacted, I was hoping to get some opinions or guidance from you gentleman.
If I have left out any information, please let me know.
I have included an IR scan of the unit while energized.
Regards,
OT2020






RE: Cooper Single Phase Transformers
RE: Cooper Single Phase Transformers
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Cooper Single Phase Transformers
RE: Cooper Single Phase Transformers
I agree that the pad are in an odd place. But they are factory installed, they came right from Cooper The portion that looks rusted is actually just the paint peeled back because of the heat.
We should hear back from Cooper tommorow morning. A contact at Waukeshaw told me that they had heard Cooper was having problems with the single phase substation style units.
OT2020