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Automatic Processing of Single-phase Grounding Fault in Distribution Network Based on Fault Phase Grounding
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Affiliation:

1.School of Automation and Information Engineering, Xi’an University of Technology, Xi’an710048, China;2.State Grid Shaanxi Electric Power Research Institute, Xi’an710100, China;3.Anhui Onesky Electric Technology Company Limited, Hefei230088, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No. U1766208).

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    Abstract:

    To solve the problem of single-phase grounding fault processing for neutral point non-effective grounding in distribution network, an automatic processing scheme for single-phase grounding faults in distribution network based on fault-phase grounding approach is proposed. The automation system consists of a fault-phase grounding arc-extinguishing line selection device in the substation and fault-phase grounding start-up protection devices deployed to the feeder switches. By adopting the fault-phase grounding method to achieve the reliable arc-extinguishing of single-phase grounding faults, the characteristics of zero-sequence voltage and zero-sequence current variations before and after the fault-phase grounding disconnection are used to achieve the line selection, location and isolation of permanent single-phase grounding fault and power restoration of sound district. By analyzing the variations of zero-sequence voltage and zero-sequence current of the system before and after the fault-phase grounding disconnection, a single-phase grounding line selection and location criterion based on the fundamental zero-sequence current ratio before and after the fault-phase grounding disconnection is constructed. The key technical problems, such as the start-up criterion for single-phase grounding fault processing, the detecting of the fault-phase grounding disconnection moment, and the necessity of throwing in a resistance to the neutral point before the fault-phase grounding disconnection are discussed in detail. Combined with an example, the proposed processing process for single-phase grounding fault is explained and experimental verification is carried out. The results show the feasibility and effectiveness of the proposed method

    表 4 Table 4
    表 2 试验过程数据记录Table 2 Data records during test process
    表 3 Table 3
    表 1 故障相接地启动保护装置的动作延时Table 1 Action time delay of start-up protection device of fault-phase grounding
    图1 基于故障相接地的配电网单相接地故障处理系统组成Fig.1 Composition of processing system for single-phase grounding fault in distribution network based on fault-phase grounding
    图2 母线故障相接地断开前后零序等效分析电路Fig.2 Zero-sequence equivalent circuit before and after breaking of bus fault-phase grounding
    图3 零序电压启动判据耐过渡电阻能力与接地残流的关系Fig.3 Relationship between maximum detectable transition resistance and residual grounding current for zero-sequence voltage start-up criterion
    图4 零序电流启动判据耐过渡电阻能力与接地残流的关系Fig.4 Relationship between maximum detectable transition resistance and residual grounding current for zero-sequence current start-up criterion
    图5 零序电压和零序电流联合启动判据的耐过渡电阻能力与接地残流的关系Fig.5 Relationship between maximum detectable transition resistance and residual grounding current for joint start-up criterion of zero-sequence voltage and zero-sequence current
    图6 10 kV配电网试验系统结构Fig.6 Structure of 10 kV distribution network for testing
    图 实例中故障相接地断开前后母线零序电压变化波形Fig. Zero-sequence voltage before and after opening the fault-phase grounding switch in the example
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LIU Jian,ZHANG Zhihua,LI Yunge,et al.Automatic Processing of Single-phase Grounding Fault in Distribution Network Based on Fault Phase Grounding[J].Automation of Electric Power Systems,2020,44(12):169-177.DOI:10.7500/AEPS20190730008

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History
  • Received:July 30,2019
  • Revised:January 13,2020
  • Adopted:
  • Online: June 18,2020
  • Published: