基于补偿参数的多零序电流互感器的小电流接地系统 单相接地故障选线方法

采用多零序电流互感器结构和补偿参数介入的方法,研究了小电流接地系统单相接地故障选线问题。设计了系统的拓扑结构,分析了不同性质补偿参数对各零序电流互感器电流幅值和相位影响的规律及对故障选线灵敏度的影响问题。分析了不同补偿参数条件下流过故障点零序电流的变化规律及故障电流的安全性问题。该选线方法的选线判据具有很高的可靠性和适应性,能够准确识别出故障线路,有效解决目前小电流接地系统单相接地故障选线领域存在的可靠性差和适应性低的技术问题。

Single-phase ground fault line selection method of small current grounding system of multiple zero-sequence current transformer based on compensation parameters

The method of multi-zero sequence current transformer structure and compensation parameters is used to study the single-phase ground fault line selection of a small current grounding system.This paper designs the topology of the system,and analyzes the influence rule of the different sequence of compensation parameters on current amplitude and phase of each zero sequence current transformer and the problem of the sensitivity of fault line selection.The variation rule of the zero-sequence current flowing through the fault point and the safety problem of the fault current under different compensation parameters are analyzed.The line selection criterion of the line selection method has high reliability and adaptability,can accurately identify the faulty line,and can effectively solve the current poor reliability and low adaptability technologies in the field of single-phase grounding fault line selection in the current small-current grounding systems problem.