Circulating current on transformer neutral
Circulating current on transformer neutral
(OP)
We have been having an issue with our control cabinet on a 138kv to 13.2kv delta to wye 25MVA transformer. We had our control cabinet burn up an incon tap position monitor blow fuses in our Beckwith and trip breakers in our cabinet as well and leave scorch marks on some conduit connections connections to the cabinet. This all happened after a 13kA fault very close to the substation and a severe lightning storm. We then discovered that the cabinet was not directly grounded. After applying the ground the system seemed to be fine until we blew another fuse. We have now measured with our clamp on ground tester that we have roughly 47 amps flowing on the ground to the control house 240v panel on its neutral that is landed to the ground bar in the control cabinet and back through the ground grid to the control cabinet it is making a loop. Any help would be greatly appreciated.






RE: Circulating current on transformer neutral
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Circulating current on transformer neutral
RE: Circulating current on transformer neutral
But I'm a little confused. A 240 Volt panel on a 138kV to 13.2 kV transformer? 47 Amps on the MVA transformer neutral may not be related to neutral current on the 240 V transformer. There is some information missing here.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Circulating current on transformer neutral
RE: Circulating current on transformer neutral
RE: Circulating current on transformer neutral
RE: Circulating current on transformer neutral
Bill
--------------------
"Why not the best?"
Jimmy Carter