Three-Phase Simultaneous Interruption in Interrupting Inductive Current Using Vaccum Switches

This paper presents the problem of overvoltage due to three-phase simultaneous interruption using vacuum switches. This three-phase simultaneous interruption is a new phenomenon which has not been known before. This paper presents the realities of over-voltage due to three-phase simultaneous interruption and the cause of three-phase simultaneous interruption. Surge suppression by the CR Surge Suppressor and Nonlinear Resistor which has been recently developed are also presented.