The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 1988
Filed:
Jan. 06, 1987
Gerhard Mauthe, Birmenstorf, CH;
Lutz Niemeyer, Birr, CH;
Friedrich Pinnekamp, Siggenthal-Station, CH;
Norbert Wiegart, Baden, CH;
BBC Brown, Boveri & Company, Ltd., Baden, CH;
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.