Yes, that sounds strange. Could it be that the lines have been downed but not disconnected? Still drawing current, overloading the grid? Can this happen? You're the linesman...
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The frequency of the grid is dependant on the load: You set the power plant to an electrical "stiffness", e.g. 30 MW per Hz. If the frequency falls .1 HZ, the power plant will increase output by 3 MW.
