基于序电压比值原理的电压互感器断线检测  

Detection of potential transformer secondary break based on the principle of sequence voltage ratio

作　　者：马俊岭 厉志波 MA Junling;LI Zhibo(China Resources New Energy Investment Co.,Ltd He’nan Branch,Zhengzhou 450018;Run-dian Energy Science and Technology Co.,Ltd,Zhengzhou 450018)

机构地区：[1]华润新能源投资有限公司河南分公司,郑州450018 [2]润电能源科学技术有限公司,郑州450018

出　　处：《电气技术》2025年第4期44-49,共6页Electrical Engineering

摘　　要：通过分析电压互感器(PT)二次回路断线后的故障特征,提出一种基于序电压比值原理的PT断线检测方法。该方法主要依据采集的PT二次电压,通过计算正序电压与负序电压的比值来判断PT是否断线。仿真结果表明,该判据能够实现对PT二次回路不对称断线故障的准确判断,尤其是在PT二次回路同时并联三角形负载与星形负载的工况下具有明显优势。Based on the fault characteristics following the disconnection of the secondary circuit of a potential transformer(PT),a detection method for PT secondary break utilizing the principle of sequence voltage ratio is proposed.This method primarily calculates the ratio of the positive sequence voltage to the negative sequence voltage from the PT’s secondary voltage data to determine the occurrence of a PT break.Simulation results demonstrate that this criterion can accurately assess whether an asymmetric disconnection has occurred in the PT secondary circuit,particularly advantageous when the PT secondary circuit is concurrently connected to both delta and star loads.

关 键 词：电压互感器(PT)断线 序电压 判据 

分 类 号：TM451[电气工程—电器]