基于共模阻抗的电机主绝缘状态在线监测技术  

On-line Monitoring Technology of Motor Groundwall Insulation State Based on Common Mode Impedance

作　　者：牛宏亮 王锴[2,3,4] 颜闽秀 王志平[2,3,4] NIU Hongliang;WANG Kai;YAN Minxiu;WANG Zhiping(Department of Information Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110016,China;Key Laboratory of Networked Control Systems,Chinese Academy of Sciences,Shenyang 110016,China;Institute of Robotics and Intelligent Manufacturing Innovation,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳化工大学信息工程学院,沈阳110142 [2]中国科学院沈阳自动化研究所,沈阳110016 [3]中国科学院网络化控制系统重点实验室,沈阳110016 [4]中国科学院机器人与智能制造创新研究院,沈阳110016

出　　处：《自动化与仪表》2024年第10期81-85,90,共6页Automation & Instrumentation

摘　　要：在变频器工作系统中,电缆上存在高dv/dt和瞬态过电压,会导致交流变频电机绝缘老化加速。为防止意外停机和避免不可预估的经济损失,研究电机绝缘健康状态在线监测方法是非常必要的。基于共模阻抗技术对电机主绝缘的健康状态进行在线监测,在变频器电子开关频率下测量一次谐波的共模分量,利用共模阻抗计算绝缘等效电容,对主绝缘健康状态进行实时监测。为了验证该方法的有效性,搭建了实验平台,通过主绝缘热老化实验,证明该方法能够在线监测电机的健康状态,为故障预测与健康管理提供重要依据。In the working system of frequency converters,high dv/dt and transient overvoltage on the cables can cause accelerated insulation aging of AC variable frequency motors.It is necessary to study online monitoring methods for motor insulation health status in order to prevent unexpected shutdowns and avoid unpredictable economic losses.This article is based on the common mode impedance technology for online monitoring of the health status of the groundwall of the motor.The common mode component of the first harmonic is measured at the electronic switching frequency of the frequency converter,and the equivalent capacitance of the insulation is calculated using the common mode impedance to monitor the health status of the groundwall in real-time.In order to verify the effectiveness of the method,an experimental platform was built,and through the groundwall thermal aging experiment,it was proved that the method can monitor the health status of the motor online,providing important basis for fault prediction and health management.

关 键 词：交流变频电机 主绝缘老化 状态监测 

分 类 号：TM93[电气工程—电力电子与电力传动] TP277[自动化与计算机技术—检测技术与自动化装置]