3 Phase Protection Relay for a 3 phase open delta circuit
3 Phase Protection Relay for a 3 phase open delta circuit
(OP)
Hi
Does anybody know of a 120v 3 phase protection relay for a 120V 3P open delta with a grounded b phase. The relay operates a automatic transfer backup power system sensing ciruit. There is a Time Mark 263 phase protection relay in the cutler hammer gear now but I am being told it does not provide protection of B phase. I might just install a phase loss relay on 480v line side in series. Anybody run into problems with the Cutler Hammer/Eaton design like this.
Thanks, ed
Does anybody know of a 120v 3 phase protection relay for a 120V 3P open delta with a grounded b phase. The relay operates a automatic transfer backup power system sensing ciruit. There is a Time Mark 263 phase protection relay in the cutler hammer gear now but I am being told it does not provide protection of B phase. I might just install a phase loss relay on 480v line side in series. Anybody run into problems with the Cutler Hammer/Eaton design like this.
Thanks, ed





RE: 3 Phase Protection Relay for a 3 phase open delta circuit
RE: 3 Phase Protection Relay for a 3 phase open delta circuit
If B phase is lost, the AB and BC voltage will change from say 120 to 104, and if you set your UV setting just above it, it should pick up. Also I beleive these relay have phase angle or rotation checkin circuitary which also should pick up.
Also this being a LV application, why not just test it.
RE: 3 Phase Protection Relay for a 3 phase open delta circuit