SHORT-CIRCUIT PROTECTION DEVICE FOR AN ELECTRICAL MACHINE FED BY A PULSE-CONTROLLED A.C. CONVERTER

摘要

A short-circuit protective device for a motor-driven and generator-driven electrical machine fed by a pulse controlled a.c. converter has reverse-parallel circuitry that is switching dependent on a monitoring device. The monitoring device detects short circuits and is provided in a d.c. current supply line. Using the reverse-parallel circuitry and the monitor, an intermediate circuit capacitor of the pulsecontrolled a.c. converter feeding the machine is isolated from the short circuit location.