基于阻抗分析的复杂配电网接地故障定位方法

A Grounding Fault Location Method for Complex Distribution Networks Based on Impedance Analysis

现有方法定位配电网接地故障时,未考虑复杂配电网的特性,存在精准度低、定位时间长及与实际故障距离误差大的问题。提出了基于阻抗分析的复杂配电网接地故障定位方法,在分析复杂配电网阻抗特性的基础上,获取配电网传输线策动点阻抗与负载阻抗特性的变化关系,将其推广到配电网传输线不同连接阻抗中;将配电网络转换成抽象图,当末端变压器安装在图内配电网顶点时,一旦配电网发生故障,故障行波就会沿着配电网的线路蔓延到配电网的末端,此时对行波进行故障定位,完成复杂配电网接地故障定位。实验结果表明,通过不同支线的故障定位精准度测试、与实际故障距离测试和故障定位时间测试,验证了所提方法在复杂配电网接地故障定位时准确性更高、有效性更强。

The current method of locating the grounding fault of distribution networks fails to consider the characteristics of the complex distribution network, which leads to low accuracy,long positioning time and large error from the actual fault distance. Therefore,this paper proposes a grounding fault location method for the complex distribution network based on impedance analysis. Based on the analysis of the impedance characteristics of the complex distribution network, the relationship between the actuation point impedance and load impedance characteristics of distribution network transmission line is obtained,and it is extended to different connection impedances of distribution network transmission line. The distribution network is transformed into an abstract diagram,and the end deformer is installed into the distribution network in the diagram. The distribution network is transformed into an abstract diagram. When the end transformer is installed at the top of the distribution network in the diagram,once the distribution network fails,the fault traveling wave will spread to the end of the distribution network along the line of the distribution network. At this time,the traveling wave fault location is carried out to complete the grounding fault location of the complex distribution network. The experimental results show that the proposed method is more accurate and effective in the grounding fault location of the complex distribution network through the fault location accuracy test of different branches,test of the distance from the actual fault and the fault location time test.