Design Of Automatic Test System For Dielectric Loss Of High Voltage Rotating Motor Based On LabVIEW

In view of the fact that the motor life of the major nuclear power plants built in my country in the early days has reached the limit,to determine how long these motors can continue to run and whether the motors need to be repaired and protected,the AC parameters of the motor insulation are analyzed.The medium for high-voltage rotating motors The loss factor is an important parameter to judge the insulation performance.According to the requirements of on-site testing,a Lab VIEW-based high-voltage rotating motor dielectric loss automatic test system is proposed to test the insulation performance of these motors.First,it introduces the background and significance,and analyzes the development status of dielectric loss tester and virtual instrument technology.The digital filter is studied,and the use of FIR digital filter can guarantee the linear phase;the data acquisition system is studied,and the multi-channel parallel data acquisition system can improve the speed and accuracy;the measurement principle and method of the dielectric loss factor are studied,and the use of triangle The orthogonality of the function can effectively suppress harmonics and DC components.The design of the automatic test system adopts the digital measurement method with high precision and accurate data.The input loop of the hardware part is designed into a differential form to improve the anti-interference performance of the circuit;the software part uses the Lab VIEW programming environment to divide the software part into five functional modules for specific design,focusing on the design of the acquisition card control program and software to achieve the dielectric loss angle Calculation procedure.Finally,by using the existing resources of the laboratory to carry out standard stimulus signal test and simulated field engineering test,the measurement accuracy is achieved in the standard stimulus signal test,and the function is intact during the simulated field test.The test results show that the automatic dielectric loss test system can complete Design goals for automation and high-precision measurement.