Switching device to detect and initiate measures to eliminate a DC short circuit caused by a malfunctioning rectifier in a DC motor propulsion system

摘要

A motor control system of the type employing phase controlled rectifiers for controlling the power supplied from a polyphase alternating current source to a direct current motor includes circuitry to detect the existence of a rectifier which is conducting at an improper time and to provide appropriate corrective action to terminate such improper conduction.