Directional Relay VS Negative-Sequence Relay
Directional Relay VS Negative-Sequence Relay
(OP)
Do these relays do the same thing?
SEL literature describes Device Number 67 as Negative-Sequence Relay and ANSI as AC Directional OC Relay.
One Hydro-Quebec guy just told me they're not...
Your comments please.
SEL literature describes Device Number 67 as Negative-Sequence Relay and ANSI as AC Directional OC Relay.
One Hydro-Quebec guy just told me they're not...
Your comments please.






RE: Directional Relay VS Negative-Sequence Relay
I think SEL uses a suffix on the 67 to denote the a negative sequence directional overcurrent relay:
67P = directional phase OC
67Q = directional neg seq OC
67G = directional ground OC
They do the same thing with their non-directional OC elements.
But SEL is not always consistent between the relay models. And their use of "N" and "G" suffix is backwards from what most people use.
RE: Directional Relay VS Negative-Sequence Relay
RE: Directional Relay VS Negative-Sequence Relay
RE: Directional Relay VS Negative-Sequence Relay
Just Dr. Schweitzer's way of keeping us on our toes, I guess.
RE: Directional Relay VS Negative-Sequence Relay
RE: Directional Relay VS Negative-Sequence Relay
Nu, now are next new terms 46A, 46T,in additional to 67P,G,N,Q and 32N,Q,P.
Are each US company used other terms ( GE, Basler, SEL)?
Regards.
Slava