| Definition: | ratio of the highest root-mean-square value of line-to-earth power frequency voltage on a healthy line conductor at a given location of a three-phase system, and for a given system configuration, during an earth fault affecting one or more line conductors at any point on the system, to the root-mean-square value of the power frequency of the line-to-earth voltage that would be obtained at the given location in the absence of any such earth fault
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