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:
Jun. 10, 2014
Filed:
Sep. 13, 2010
Bertil Berggren, Västerås, SE;
Jianping Wang, Västerås, SE;
Juiping Pan, Raleigh, NC (US);
Kailash Srivastava, Västerås, SE;
Kerstin Linden, Ludvika, SE;
Reynaldo Nuqui, Cary, NC (US);
Bertil Berggren, Västerås, SE;
Jianping Wang, Västerås, SE;
Juiping Pan, Raleigh, NC (US);
Kailash Srivastava, Västerås, SE;
Kerstin Linden, Ludvika, SE;
Reynaldo Nuqui, Cary, NC (US);
ABB Research Ltd, Zurich, CH;
Abstract
A protection system for high voltage direct current, HVDC, transmission lines is provided. The protection system includes a direct current, DC, bus, a device configured to connect an HVDC transmission line to the bus, at least one DC circuit breaker arranged for disconnecting the transmission line from the bus upon reception of a trip signal, current and voltage sensors, an inductor arranged such that the current through the transmission line passes the inductor, and a fault detection unit. The fault detection unit is arranged for assessing, on the basis of current and/or voltage measurements, whether a fault exists on the transmission line, and sending, if a fault is detected on the transmission line, a trip signal to the circuit breaker. The additional inductance limits the rise in fault current and facilitates a selective fault detection. Further, a method of fault protection for an HVDC transmission line is provided.