METHOD FOR OPERATING A MEDIUM VOLTAGE CIRCUIT BREAKER OR RECLOSER AND MEDIUM VOLTAGE CIRCUIT BREAKER OR RECLOSER ITSELF

摘要

The invention relates to a medium voltage circuit breaker or recloser equipped with an electromagnetic drive and with means for monitoring the travel curves of the closing and opening operation, according to the preamble of claim 1. In order to avoid the need of positioning sensors at the drive chain of the circuit breaker or recloser, and to determine its travel curve with high accurancy, the invention is, that the travel curve is derived by the evaluation of the shape of the applied current and the shape of the applied voltage, using a mathematical representation of the electromagnetic actuator.