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The influence of prestrike on the peak values of energisation transients

The influence of the prestrike phenomena in a circuit breaker has been investigated. It is shown that due to prestrike the closing instants of a circuit breaker will have a non-uniform statistical distribution and that the influence on the peak overvoltage distribution is significant. The voltage-drop across the circuit breaker in the prestrike period has been considered and a better agreement between field test oscillograms and calculated transients is obtained when this voltage-drop is accounted for.