Guard system for inverter apparatus

Details Guard system for inverter apparatus Guard system for inverter apparatus

1986-01-23

1987-06-09

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 96, 363136, H02H 7122

Patent

active

046725253

ABSTRACT:
An inverter using gate turn-off thyristors (GTOs) is controlled by means of pulse width modulation (PWM) to control the speed of an induction motor. If the current flowing through the induction motor becomes an overcurrent which can still be cut off by the GTOs, a gate off signal is supplied to respective GTOs to interrupt the overcurrent. If any one of arms respectively corresponding to phases is short-circuited, a gate on signal is supplied to all GTOs to distribute the short circuit current among the arms, and the main circuit is interrupted by a high-speed breaker. At this time, a simultaneous gate on signal is given priority. If the simultaneous gate on signal is present, a simultaneous gate off signal is disabled. Owing to this configuration, destruction of the GTOs due to consecutive guard operation can be prevented.

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