“Probably has a large transformer go south. When one of these things self destructs you get a system transient, on a chart it looks like a big spike up and then down, Voltage.
Large Generators have over voltage and under voltage relays to protect the unit from these little buggers, big enough hit your out.”
Exactly. Blow a big transformer at a substation and you got juice with no place to go. Got to trip the generators off line. That puts too much drain elsewhere and vola cascades. This all looks rare but not hard to explain.
Well, the power is still on in upper east Tennessee. Life is good. :)
Large cascades are rare like the one in Ohio a few years ago, System operators do an excellent job for the most part, but trips due to transients are common, system configuration. I have lost units because of very strange system happenings such as a guy who tried to make love to a 345 KV line in a switch yard.