Deploying correct fault loop in distance protection of multiple-circuit shared tower transmission lines with different voltages

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceeding

Abstract

Combined faults occurring between different voltage levels in overhead lines present a challenge for distance protection. Previous work has shown that such faults most often appears as single phase to ground (SPTG) faults in a normal type of overhead line. However, it is not obvious that distance relays will identify and select the correct fault loop according to being similar to SPTG, as all six fault loops get excited when combined faults occur. This paper presents a study where two distance relays of different manufactures are tested using transient replay and secondary test equipment, in order to reveal which fault loops are activated and whether a safe trip for combined faults happens
Close

Details

Combined faults occurring between different voltage levels in overhead lines present a challenge for distance protection. Previous work has shown that such faults most often appears as single phase to ground (SPTG) faults in a normal type of overhead line. However, it is not obvious that distance relays will identify and select the correct fault loop according to being similar to SPTG, as all six fault loops get excited when combined faults occur. This paper presents a study where two distance relays of different manufactures are tested using transient replay and secondary test equipment, in order to reveal which fault loops are activated and whether a safe trip for combined faults happens
Original languageEnglish
Title of host publicationIET DPSP proceedings 2018
Publication date2018
StatePublished - 2018
Publication categoryResearch
Peer-reviewedYes
ID: 264873468