SHORT CIRCUIT PROTECTOR OF ROTARY MACHINE

摘要

PURPOSE: To surely protect short-circuiting by providing an anti-parallel circuit which comprises a protective diode for passing only the current of a rotating machine operated as an electric motor and a power semiconductor element for passing only the current of the rotating machine operated as a dynamo. CONSTITUTION: A protective diode DS having a polarity for passing the current of an electric motor of a rotating machine M is disposed in a DC current supplying line L+ . The protective diode DS is bridged by a controllable power semiconductor element HS having a reverse current passing direction. A high-speed removal monitor device EW for the element HS is connected to a supply line L+ within the range of an anti-parallel circuit. When a DC supplying source not illustrated is short-circuited, the monitor EW gives a blocking command to the element HS. Therefore, the short-circuiting current of the rotating machine is blocked.