Studies on fault impedance
Studies on fault impedance
(OP)
Does anyone know of any studies on the percentage of different fault impedances on transmission systems?
We should all know that phase to ground faults are the most common, but what percentage are high impedance and what percentage are low impedance?
Common thinking is most faults on transmission systems are low to mid impedance, but where did we get that from?
We should all know that phase to ground faults are the most common, but what percentage are high impedance and what percentage are low impedance?
Common thinking is most faults on transmission systems are low to mid impedance, but where did we get that from?






RE: Studies on fault impedance
RE: Studies on fault impedance
RE: Studies on fault impedance
RE: Studies on fault impedance
What I have seen is while making coordination for low impedance ground faults, the coordination for high impedance ground faults seems to suffer. So I was wondering if there were any studies of typical fault ranges and chances for each range so I can pay more attention on the most likely events.
Another thing I have seen is that once you describe how the phase protection works, people tend to think they know all about protection. When the fact is more than 95% of faults are ground faults. So truthfully the phase protection is less important than ground protection, but phase protection effects tends to be more destablizing to the power system.
RE: Studies on fault impedance
RE: Studies on fault impedance
CR
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