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:
Oct. 04, 2016
Filed:
Aug. 06, 2012
Przemyslaw Balcerek, Cracow, PL;
Murari Saha, Vasteras, SE;
Eugeniusz Rosolowski, Wroclaw, PL;
Jan Izykowski, Wroclaw, PL;
Piotr Pierz, Wroclaw, PL;
Przemyslaw Balcerek, Cracow, PL;
Murari Saha, Vasteras, SE;
Eugeniusz Rosolowski, Wroclaw, PL;
Jan Izykowski, Wroclaw, PL;
Piotr Pierz, Wroclaw, PL;
ABB TECHNOLOGY AG, Zurich, CH;
Abstract
The present invention is concerned with a method of distance protection of parallel transmission lines applicable both to series compensated and uncompensated electric power lines, using a distance relay. The method is characterized in that a pair of flags (ff, ff) are calculated for indication faulted and healthy circuits in parallel lines and in the same time a flag (Internal_Fault) for indication internal or external fault in parallel lines is calculated independently. Next gathering all calculated flags (ff, ff, Internal_Fault) an analyze of the value of these flags are performed and depending on the values of flags (ff, ff, Internal_Fault) and on their reciprocal relationship, a trip permission signal from the protection relay () is released and sent to the alarms devices or to the line breakers, or a block signal from the protection relay () is generated and sent to protect parallel lines before damage.