Simulation analysis of intermittent arc grounding fault applying with improved cybernetic arc model

Shurong Li; Yongduan Xue; Guang Feng; Bingyin Xu

Simulation analysis of intermittent arc grounding fault applying with improved cybernetic arc model

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Author(s): Shurong Li¹ ; Yongduan Xue¹ ; Guang Feng² ; Bingyin Xu³
- Affiliations: 1: College of Information and Control Engineering , China University of Petroleum , Qingdao , People's Republic of China ;
  2: Electric Power Research Institute , China Henan Power Grid , Zhengzhou , People's Republic of China ;
  3: College of Electrical and Electronic Engineering , Shandong University of Technology , Zibo , People's Republic of China
Source: Volume 2019, Issue 16, March 2019, p. 3196 – 3201
DOI: 10.1049/joe.2018.8457 , Online ISSN 2051-3305

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)

Received 22/08/2018, Accepted 19/09/2018, Published 29/10/2018

Intermittent arc grounding fault frequently occurs in non-solidly earthed networks. Establishing an accurate arc model is the basis for analysis of fault characteristics. First of all, an improved cybernetic arc model is introduced in this study, which can effectively demonstrate arcing process through controlling the arc length, and which is applied to simulation analysis of intermittent arc grounding fault. Then, a novel method is proposed to identify when the arc would extinguish or restrike. Arc extinction is determined by comparing the stable ignition voltage and air withstand voltage, while arc reignition is dependent on the competition between recovery voltage and air withstand voltage. Finally, a typical simulation model of 10 kV distribution network is built via PSCAD, and impacts of arc model parameters on fault characteristics are analysed. Comparison between simulation results and field data indicates that the arc model can accurately describe arc characteristics and that the intermittent arc grounding overvoltage generated by the suggested method is consistent with the actual case. In the Petersen coil grounded system, arc reignition times turns to be fewer, intermittent arc duration shorter and the overvoltage amplitude lower than those in the isolated neutral system.

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Simulation analysis of intermittent arc grounding fault applying with improved cybernetic arc model

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