rwalker1
Electrical
- Jun 15, 2006
- 4
I've run into a situation where a new customer wanted me to test his ground fault relay. After servicing the high pressure switch and beginning to set up my test equipment I noticed that the relay's control power wiring had been removed and taped. In addition the relay's current pot had been turned past the maximum setting. It was Saturday and I've seen plenty of ground fault relays unhooked to prevent "nuisance tripping" and the adjustment being turned past max supported my theory. With no wiring diagram or clear indication where to land the control wiring I could not test the relay. Due to the expense of downtime and my recommondation, I order them a new relay to test and install.
Return to site for another issue prior to the new relay arriving and end up at the incoming substation. Low and behold the 13.8 to 480 delta wye transformer has nothing on the Xo bushing. Ooops. So now the relay I've ordered is useless. Start looking around, this forum and others, and the use of PT's for ground fault protection in an ungrounded system is frequently discussed. Now it occurs to me that there was a Taylor phase guard relay (basically an anti single phase relay). Could this have been someones solution to the problem? If so, how good a solution was it?
Sorry if a bit long winded.
Return to site for another issue prior to the new relay arriving and end up at the incoming substation. Low and behold the 13.8 to 480 delta wye transformer has nothing on the Xo bushing. Ooops. So now the relay I've ordered is useless. Start looking around, this forum and others, and the use of PT's for ground fault protection in an ungrounded system is frequently discussed. Now it occurs to me that there was a Taylor phase guard relay (basically an anti single phase relay). Could this have been someones solution to the problem? If so, how good a solution was it?
Sorry if a bit long winded.