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access icon free Adaptability of phase selectors based on phase-to-phase superimposed currents when confronting cross-voltage faults in mixed-voltage quadruple-circuit line system

© The Institution of Engineering and Technology
Received 20/12/2017, Accepted 20/04/2018, Revised 20/03/2018, Published 25/04/2018

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.

Inspec keywords: power transmission lines; power transmission faults; poles and towers

Other keywords: phase-to-phase superimposed currents; multicircuit faults; mixed-voltage quadruple-circuit line system; PTPSC; tower; confronting cross-voltage faults; fault model; PSCAD; mixed-voltage quadruple-circuit transmission lines; phase selector adaptability; voltage level systems; cross-voltage short-circuit calculation; single transmission line

Subjects: Network and transmission line calculations; Power line supports, insulators and connectors

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