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基于故障相接地的配电网单相接地故障自动处理
作者:
作者单位:

1.西安理工大学自动化与信息工程学院,陕西省西安市 710048;2.国网陕西省电力公司电力科学研究院,陕西省西安市 710100;3.安徽一天电气技术股份有限公司,安徽省合肥市 230088

作者简介:

通讯作者:

基金项目:

国家自然科学基金资助项目(U1766208)。


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

1.School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, China;2.State Grid Shaanxi Electric Power Research Institute, Xi’an 710100, China;3.Anhui Onesky Electric Technology Company Limited, Hefei 230088, China

Fund Project:

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

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    摘要:

    针对中性点非有效接地配电网单相接地故障处理难题,提出一种基于故障相接地的配电网单相接地故障自动处理方案。自动化系统由变电站内的故障相接地熄弧选线装置和配置于馈线开关的故障相接地启动保护装置构成。通过采用故障相接地手段实现单相接地故障的可靠熄弧,利用故障相接地断开前后的零序电压和零序电流变化特征实现永久性单相接地故障选线、选段、隔离和健全区域供电恢复。通过对故障相接地断开前后系统零序电压和零序电流的变化规律分析,构造了基于故障相接地断开前后基波零序电流比值的单相接地选线和选段判据。讨论了单相接地故障处理启动判据、故障相接地断开时刻感知、故障相接地断开前中性点中电阻投入必要性等关键技术问题。结合实例对所提出的单相接地故障处理过程进行了说明,并开展了实验验证,结果表明了所提出方法的可行性和有效性。

    Abstract:

    To solve the problem of single-phase grounding fault processing for neutral point non-effectively grounding in distribution network, an automatic processing scheme for single-phase ground 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 some fault-phase grounding start-up protection devices arranged in 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 changes 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 change 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 sensing of the fault phase grounding disconnection moment, and the necessity of injecting 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 recording 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 the 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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引用本文

刘健,张志华,李云阁,等.基于故障相接地的配电网单相接地故障自动处理[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190730008.
LIU Jian,ZHANG Zhihua,LI Yunge,et al.Automatic Processing of Single-phase Grounding Fault in Distribution Network Based on Fault Phase Grounding[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190730008.

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  • 收稿日期:2019-07-30
  • 最后修改日期:2020-04-21
  • 录用日期:2020-01-13
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