Location of Single Phase-Earth Faults in Distribution Networks based on Synchronous Transient Energy

Xuewen Wang, Hengxu Zhang, Fang Shi, Qiuwei Wu, Vladimir Terzija, Wei Xie, Chen Fang

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Abstract

As a result of small fault current, high level of noise and a large penetration of distributed generators (DG), in the neutral non-effectively grounded medium-voltage (MV) distribution networks, it is quite difficult to locate the faulted line section for single phase to ground faults. In this paper, using a technique based on synchronized measurements in distribution networks, a fault location method based on the analysis of the energy of the transient zero-sequence current in the selected frequency band (SFB) is proposed. The equivalent impedance of the distribution network with lateral branches is studied with an equivalent network, and the phase-frequency characteristics of the equivalent impedance are analyzed. The SFB, within which the transient energy of the faulty line section is larger than that of the healthy line sections is determined. A combined fault-section location criterion is proposed and the implementation scheme is illustrated with the distribution level phasor measurement units. Numerical simulations of the IEEE 34 node system and the field experiments of a 10kV distribution network validate the feasibility and effectiveness of the proposed method.
Original languageEnglish
Article number8821411
JournalIEEE Transactions on Smart Grid
Volume11
Issue number1
Number of pages12
ISSN1949-3053
DOIs
Publication statusPublished - 2019

Keywords

  • Active distribution networks
  • Fault location
  • Neutral non-effectively grounded system
  • Single phase to ground faults
  • Transient zero-sequence current

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