基于单端电流的电流互感器断线检测

Disconnection Detection of Current Transformer Based on Single-ended Current

提出一种利用单端电流信号检测三相电流互感器断线算法。该算法利用间接计算的零序电流及直接测量的零序电流有无故障特征,来检测三相电流互感器有无不对称断线故障。所提算法采用新的比值判据,提高了算法的性能。理论研究和试验分析表明,所提算法是正确有效的,具有性能可靠、经济适用及使用范围大的特点。

This paper presents an algorithm for detecting disconnection of three-phase current transformer using single-ended current signal.This algorithm uses the indirectly calculated zero-sequence current and the directly measured zero-sequence current with or without fault characteristics to detect the presence of asymmetrical disconnection faults in the three-phase current transformer.The proposed algorithm uses new ratio criteria,which improves the performace of the algorithm.Theory study and simulation analysis show that the proposed algorithm is correct and effective,and has the characteristics of reliability,economical applicability and wide application range.