Open AccessDeploying correct fault loop in distance protection of multiple‐circuit shared tower transmission lines with different voltages
Author(s) -
Bak Claus Leth,
Faria da Silva Filipe
Publication year - 2018
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.0158
Subject(s) - overhead (engineering) , fault (geology) , tower , electric power transmission , transient (computer programming) , computer science , voltage , line (geometry) , loop (graph theory) , transmission line , transmission (telecommunications) , electrical engineering , reliability engineering , engineering , telecommunications , structural engineering , mathematics , geology , geometry , combinatorics , seismology , operating system
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. A study where two distance relays of different manufactures are tested using transient replay and secondary test equipment is presented, in order to reveal which fault loops are activated and whether a safe trip for combined faults happens.