NERC asks unusual questions
NERC asks unusual questions
(OP)
How would anyone answer this question from NERC? "Were there alarms in place to notify of a relay misoperation?"
I would be laughing if they weren't serious.
Are there any manufacturers who's relays provide misoperation alarms?
I would be laughing if they weren't serious.
Are there any manufacturers who's relays provide misoperation alarms?






RE: NERC asks unusual questions
Also, it depends a little on your definition of "misoperation" and knowing NERC, they probably have their own definition. If a relay was supposed to operate but did not, it could conceivably initiate a breaker failure and this would probably be alarmed.
RE: NERC asks unusual questions
RE: NERC asks unusual questions
Be VERY careful in thinking that NERC or FERC staff are not informed. They speak a slightly different language perhaps, but they are competent (and they deserve appropriate respect). We usually try to educate ourselves and them so that we can communicate better as a first step.
RE: NERC asks unusual questions
It still stands that if you ask a question wrong, you may get a wrong answer (Which is a debate we are having, what was the intended question).
Can't NERC hire power system engineers.
RE: NERC asks unusual questions
Yeah... They light up on the same panel as the fault anticipator.
old field guy
RE: NERC asks unusual questions
May you grow up to be righteous, may you grow up to be true...
RE: NERC asks unusual questions
Loss of VT circuit is only good from the VT to the monitor. Dosen't do anything for a loose termation on the relay.
Sort of like the trip circuit monitor.
RE: NERC asks unusual questions
In the UK the electromechanical distance relays will trip the circuit for a blown fuse, instead of locking up. In some other European countries there's a different approach and the protection will lock up for blown VT fuse, hence relying on the protection ‘to know’ if it's a genuine fault or not. In the UK, having a stiff system they decided to trip regardless, for the same reason they don't lock up the protection for power system swings, deemed unlikely to happen.
So, if you have a circuit trip and distance protection operated at one end only, also VT supervision alarm up (blown fuse), you can work out it was a malop
May you grow up to be righteous, may you grow up to be true...
RE: NERC asks unusual questions
However our electromechinical panels do have potential lights, and are supose to be checked every month.
RE: NERC asks unusual questions
RE: NERC asks unusual questions
In India, they thought that you need a fault to operate a distance protection as well and it ended up in tears:)
May you grow up to be righteous, may you grow up to be true...
RE: NERC asks unusual questions