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:
May. 26, 2015
Filed:
Sep. 13, 2010
Bertil Berggren, Västerås, SE;
Jianping Wang, Västerås, SE;
Juiping Pan, Raleigh, NC (US);
Kerstin Linden, Ludvika, SE;
Reynaldo Nuqui, Raleigh, NC (US);
Bertil Berggren, Västerås, SE;
Jianping Wang, Västerås, SE;
Juiping Pan, Raleigh, NC (US);
Kerstin Linden, Ludvika, SE;
Reynaldo Nuqui, Raleigh, NC (US);
ABB RESEARCH LTD, Zurich, CH;
Abstract
A breaker failure protection system for a high voltage direct current, HVDC, circuit breaker is provided. The circuit breaker is arranged for interrupting a DC circuit upon reception of a trip signal. The protection system includes a current sensor, at least one inductor, and a breaker failure detection unit. The current sensor is arranged for measuring a current I(t) through the DC circuit. The at least one inductor is connected in series with the DC circuit. The breaker failure detection unit is arranged for assessing, whether the circuit breaker has failed, and sending, if the circuit breaker has failed, a trip signal to an adjacent circuit breaker. The assessment is based on the measured current. The stability of HVDC grids may be improved by sending, in case of a breaker failure, a trip signal to adjacent circuit breakers. Further, a method of breaker failure protection for an HVDC circuit breaker is provided.