一种无信道配电网单相接地故障自愈方案

A Self-healing Solution of Single-phase Ground Fault for Distribution Network without Communication

针对10k V配电线路的单相接地故障,提出了一种不依赖于通信的自愈方案。方案包括故障选线、故障选段与隔离、非故障区段复电3个部分。故障选线采用的是基于健全线路和非健全线路的模型识别法;故障选段采用零压-时限的电压型逻辑识别和隔离故障区段;隔离故障区段后,联络点及非故障区域自动化点基于电压-时限逻辑复电。仿真结果和现场试验结果表明,所提自愈方案能可靠准确地实现单相接地故障自动快速隔离、非故障区域快速复电,且无需电流定值整定,无需通信,工程实施简易经济,可对现有配电网馈线自动化进行理论和实践指导。

This paper proposes a self-healing solution of single-phase ground fault for the 10 kV distribution line single- phase ground fault without communication. This scheme includes three phases： fault line selection, and non-fault zone restoration. Fault line selection is based on parameter identification method, fault segment detection and isolation is based on zero-voltage time-bound logic, and the restoration of connection points and automation points of non-fault zone are based on voltage time-bound logic. The simulation results and the field testing results verify that the self-healing solution could achieve the automatic quick fault isolation quickly and reliability. In addition, the adjustment of the current and communication are not needed, and the implementation is simpler and more economic. Therefore it could be theoretical and practical significance for the research of 10kV feeder automation.