基于自激法的非接触式CVT介质损耗测量装置研究

摘要

The normal operation of CVT affects the stability of the whole power system directly.A CVT dielectric loss measuring system based on self-excitation with non-contact mode is presented in this paper.CVT's voltage and current waveforms are sampled synchronously by non-contact measuring platform.The wireless WiFi module is used to transmit the measured electrical parameters to the PC side.The harmonic analysis method is adopted to process the voltage and current signals on LabVIEW software platform,and the dielectric loss parameter (tanδ) is obtained by calculation.The test result shows that this method can effectively detect the dielectric loss and capacitance values of each capacitor in the CVT,display the voltage and current parameters,and can be used to measure the long-term insulating state of CVT.It can isolate the high voltage in the actual dielectric loss measurement,and has high safety and reliability.%CVT能否正常可靠运行直接影响到整个电力系统的稳定性,为实时监测CVT的绝缘状态,提出了基于自激法的非接触式CVT介损测量系统.通过非接触式测量平台对电压电流波形同步采样,并由无线WiFi模块将所测得电参量传输至PC端,在LabVIEW软件平台上用谐波分析法进行电压电流信号的处理并计算得出介质损耗参数tan δ.该方法可以有效测出CVT各部分电容器的介损值和电容值,同时能够可视化电压电流参量,用于长期监测CVT绝缘状态,在实际的介损测试中可以隔离高压,有较高的安全性和可靠性.