GE IAC relay as Directional Overcurrent Relay?
GE IAC relay as Directional Overcurrent Relay?
(OP)
I'm looking at some one-lines for an old facility that shows several GE IAC relays used as directional overcurrent relays. Since the IAC is non-directional, I'm not quite sure how this is accomplished. I don't doubt the drawing is correct, but I'm curious about the implementation.
Maybe some type of external polarizing relay to block the trip contacts?
Has anyone run across this before?
Maybe some type of external polarizing relay to block the trip contacts?
Has anyone run across this before?






RE: GE IAC relay as Directional Overcurrent Relay?
RE: GE IAC relay as Directional Overcurrent Relay?
The relay is listed as an IAC51A1CAP, so I'm guessing the "CAP" is making it directional somehow, but I can't find any GE info on a CAP relay or function.
The one-lines do show connections from the PTs to the relay, so maybe it was some special add-on element.
RE: GE IAC relay as Directional Overcurrent Relay?
Can you go to the installation and look at the relay(s) in person?
RE: GE IAC relay as Directional Overcurrent Relay?
You're right - there were a lot of "special" relays made back in the old days.
Thanks.
RE: GE IAC relay as Directional Overcurrent Relay?
dpc:
For IAC-overcurrent relays:
http://ww
For CAP-relays:
http:
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RE: GE IAC relay as Directional Overcurrent Relay?