Short-circuit protection device for an electrical machine...

H - Electricity – 02 – H

Patent

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318/98

H02H 7/08 (2006.01)

Patent

CA 1302482

ABSTRACT OF THE DISCLOSURE 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 pulse- controlled a.c. converter feeding the machine is isolated from the short circuit location.

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