high impedance fault detection
high impedance fault detection
(OP)
What is the status of providing additional protection for high impedance faults? Is it widely used?
I have seen papers on it over the years and just wondered if anyone is using it. Schweitzer has a relay based on harmonic signatures. Sounds like what Don Russell developed many years ago.
We occasionally drop an overhead conductor on sand and get no fault current. It's a safety concern, but is the additional protection worth it? We don't think so, but I'm curious if any utilities out there use high impedance relaying.
I have seen papers on it over the years and just wondered if anyone is using it. Schweitzer has a relay based on harmonic signatures. Sounds like what Don Russell developed many years ago.
We occasionally drop an overhead conductor on sand and get no fault current. It's a safety concern, but is the additional protection worth it? We don't think so, but I'm curious if any utilities out there use high impedance relaying.






RE: high impedance fault detection
RE: high impedance fault detection
Basically it was a way for utilities to shield themselves from the expense of having to upgrade all of their OH Lines that are susceptible to a downed conductor, verses the liability of not having all of the lines protected and someone is harmed. I was told this several years ago, so this is only the essence of what I remember.
I suppose this would make sense as both GE and SEL have this ability and I've yet to see it used.
I would be interested in what others have to say as well.