Undervoltae relay and earthfaults detection
Undervoltae relay and earthfaults detection
(OP)
Hallo guys,
need help on the 7RW6000 undervoltage relay. Can this relay be connected on the delta side of a Star/Delta transformer to detect eartfaults in the transformer when the Delta side autorecloser is open.
Regards,
Punglu
need help on the 7RW6000 undervoltage relay. Can this relay be connected on the delta side of a Star/Delta transformer to detect eartfaults in the transformer when the Delta side autorecloser is open.
Regards,
Punglu






RE: Undervoltae relay and earthfaults detection
Where is VT instaLled ? What is a VT connection type:
phase to ground(earth) or ohase to phase?
Theoreticaly possible use undervoltage relay, it will blocked by trafo LV CB close posotion, practicaly, I never see it's before. More better use broken delta detection principle., possible use relay with internally broken delta calculation , you can use Siprotec too.
Best Regards.
Slava
RE: Undervoltae relay and earthfaults detection
"7RW6000 for detecting Earth fault protection on delta side" Yes, can be used.
Required: 3-phase VT located between transformer and Auto recloser with windings connected in broken delta.
Broken delta voltage is wired to 7RW and the relay set as residual overvoltage relay (59N), that is, the relay will pickup and provide output when the residual voltage sensed is more than the set point.
Typical setting would be 5V with a time delay of say, 2sec.
RE: Undervoltae relay and earthfaults detection
Thank you
RE: Undervoltae relay and earthfaults detection
The relay, 7RW6000-2EA00-0DA00/BB, seem trip only on the undervoltage function. It can detect and annunciate an overvoltage but I cant get the contact to trip the breaker.
Anything I may have overlooked?
RE: Undervoltae relay and earthfaults detection
Please see manual of relay.
ht
Please check yourself again, this relay is include overvoltage protection.
Best Regards.
Slava
RE: Undervoltae relay and earthfaults detection
ht
RE: Undervoltae relay and earthfaults detection