Circuit breaker

Details Circuit breaker Circuit breaker

1987-01-06

1988-08-16

Tolin, G. P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 8, 361 11, 361 13, 335 11, H02H 300

Patent

active

047648368

ABSTRACT:
The circuit breaker displays a commutation device (4) and a semiconductor valve arrangement (6) which is connected in parallel with the commutation device (4), an isolating switching point (5) connected in series with the semiconductor valve arrangement (6) and a control circuit (11). The control circuit detects the polarity of the current to be disconnected and, together with a switching-off command (24), emits a response command to the commutation device (4) when the detected current flows in the direction of conduction of the semiconductor valve arrangement (6). When the current to be disconnected is interrupted in the semiconductor valve arrangement (6) after the commutation device (4) has responded, the control circuit (11) emits a release command to the isolating switching point (5) forming an isolating gap. As a result, the semiconductor valve arrangement (6) is isolated and the switching-off process is terminated. This circuit breaker is intended to be controlled by simple means, in spite of a comparatively low number of semiconductor valves (diode 10). This is achieved by the fact that the semiconductor valve arrangement (6) contains at the most one semiconductor valve (diode 10) or a series circuit of several semiconductor valves (diodes 10, 18) with the same direction of conduction, and that the commutation device (4) and the isolating switching point (5) are mechanically coupled to each other in such a manner that the isolating switching point (5) opens with a predetermined time delay after the commutation device (4) has responded.

REFERENCES:
patent: 3388295 (1968-06-01), Misencik et al.
patent: 4209814 (1980-06-01), Garzon
patent: 4459629 (1984-07-01), Titus
patent: 4636907 (1987-01-01), Howell

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