Open AccessAdaptability of phase selectors based on phase‐to‐phase superimposed currents when confronting cross‐voltage faults in mixed‐voltage quadruple‐circuit line system
Author(s) -
Zheng Tao,
Zhang Jiaqin,
Wu Qiong
Publication year - 2018
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2017.1956
Subject(s) - adaptability , voltage , line (geometry) , phase (matter) , mixed phase , three phase , computer science , electronic engineering , materials science , engineering , electrical engineering , physics , mathematics , biology , ecology , geometry , quantum mechanics
For the mixed‐voltage quadruple‐circuit transmission lines on the same tower, its special construction form makes the cross‐voltage faults, i.e. multi‐circuit faults that occur between different voltage level systems, easy to occur. Although the phase selector based on phase‐to‐phase superimposed currents (PTPSC) shows excellent performance in the single transmission line, it cannot guarantee to identify faulted phases when confronting cross‐voltage faults. In this study, the adaptability of phase selectors based on PTPSC is analysed and a new method of phase selection is put forward. First, the PTPSC measured by the relay can be obtained on the basis of cross‐voltage short‐circuit calculation. Then, the influencing factors and possible selection results are comprehensively analysed, and the corresponding measure has been proposed. Finally, a fault model of mixed‐voltage quadruple‐circuit transmission lines is constructed in PSCAD and simulation results agree well with the theoretical analysis, verifying the validity of this method.