A revised model for calculating HV cable sheath current under short-circuit fault condition and its application for fault location - Part 1: the revised model

Mingzhen Li, Chengke Zhou, Zhou Wenjun

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Abstract

This two-part paper proposes a revised method for calculating HV (High Voltage) cable sheath currents, and for fault location of cross-bonded HV cable systems. The equivalent circuit and the cable impedance per unit length under short-circuit fault conditions are revised from those under non-fault conditions. Part 1 of this paper proposes a revised phasor domain mathematical model for the sheath current calculation under fault conditions, following demonstration that short-circuit faults can cause changes in the equivalent circuit of the cable metal sheath, and causing changes in the cable impedance per unit length. The calculation results, as given in a case study, show that there exists a unique relation between the fault position and the sheath fault currents, making it possible to locate a fault by analyzing the characteristics of the sheath currents during a fault. Part 2 of the paper focuses on the fault location method via sheath current monitoring.
Original languageEnglish
Pages (from-to)1674-1683
Number of pages10
JournalIEEE Transactions on Power Delivery
Volume34
Issue number4
DOIs
Publication statusPublished - 22 May 2019

Keywords

  • circuit faults
  • cable shielding
  • power cables
  • metals
  • impedence
  • conductors
  • equivalent circuits

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