110kV电容式电压互感器上节电容的介质损耗因数实验研究

Experimental Research on tanδof Upper Capacitance of 110kV Capacitance Voltage Transformer

介质损耗因数tanδ的大小反映绝缘介质的绝缘状况.电容式电压互感器tanδ的测量对保证其安全运行有着重要的意义.本文模拟不同的外界污染环境,并在每种污染环境下,选择不同的实验电压,采用正、反两种接线方法对110kV电容式电压互感器上节电容器的tanδ值进行实测.结果发现:正接线时,tanδ随着电压的升高而降低;反接线时,tanδ随着实验电压的升高,基本保持不变.对此进行了理论分析,提出了提高tanδ现场测量精度的测量方法和在现场测试过程中的注意事项.

The tangent of dielectric loss angle （i. e. tan ~） is named dielectric loss factor, and its value can reflect insulation state of the dielectric. The measurement of tan ~ has significance to ensure the safety operation of capacitor voltage transformer. The different external environment pollution with different voltage is simulated, and then tan ~ values of upper half of 110 kV capacitor voltage transformer is measured by using positive and negative wiring methods. The measurement results show that tan 9 reduces as the voltage rising with positive wiring, and essentially keeps unchanging as the voltage increasing with anti-wiring. The corresponding theoretical analysis is presented, and then some methods to improve the accuracy of tan d measurement and notes which may be concerned in experimental field are proposed.