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:
Feb. 03, 2015
Filed:
Apr. 04, 2011
Lars-erik Juhlin, Ludvika, SE;
Lars-Erik Juhlin, Ludvika, SE;
ABB Technology AG, Zurich, CH;
Abstract
A breaker failure detection device for a direct current (DC) circuit breaker () is provided. The circuit breaker comprises a circuit breaking element () and a non-linear resistor, e.g., a surge arrester (), connected in parallel. The breaker failure detection device comprises a current sensor (), for measuring a current commutating from the circuit breaking element (), and a breaker failure detection unit (). The breaker failure detection unit () is arranged for comparing the measured current to desired values and deciding that an internal commutation process of the circuit breaker () does not proceed as desired if the measured current deviates from the desired values. The present invention makes use of an understanding that an improved detection of breaker failures may be achieved by monitoring the internal commutation process of the circuit breaker. Further, a method of breaker failure detection is provided.