Nonlinearity Characteristic of High Impedance Fault at Resonant Distribution Networks: Theoretical Basis to Identify the Faulty Feeder

Mingjie Wei, Hengxu Zhang, Fang Shi, Weijiang Chen, Vladimir Terzija

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Feeder identification is indispensable for distribution networks to locate faults at a specific feeder, especially when measuring devices are insufficient to locate faults more precisely. For the high impedance fault (HIF), the feeder identification is much more challengeable and related approaches are still in the early stage. This paper thoroughly reveals the nonlinearity characteristics of different feeders when a HIF happens at a three-wire system that is with the resonant grounded neutral (RGN). Firstly, the diversity of nonlinearity existing in HIFs is explained from the perspective of energy. Then, the nonlinearity of zero-sequence current that differs between healthy and faulty feeders are deduced theoretically. Effects of the detuning index of Petersen coil, the damping ratio of system, and the length of feeder are all considered. Afterward, these theoretical conclusions are verified by the HIF cases experimented in a real 10kV system. Finally, after indicating the problems of a classic phase-relationship-based algorithm, we suggest an improved method based on the phase differences between the harmonic currents of different feeders. The effectiveness of the method has been verified.

Original languageEnglish
JournalIEEE Transactions on Power Delivery
DOIs
Publication statusPublished - 2021
Externally publishedYes

Keywords

  • Distortion
  • Distribution networks
  • distribution networks
  • Fault diagnosis
  • feeder identification
  • Harmonic analysis
  • high impedance fault
  • Impedance
  • nonlinearity
  • resonant grounded neutral
  • Substations
  • three-wire system
  • Transient analysis

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