On-line Monitoring Technology of Motor Groundwall Insulation State Based on Common Mode Impedance
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 ground wall 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.
AC variable frequency motorgroundwall insulation agingcondition monitoring
万方数据
维普
