基于谐振特性的高压电缆介损测试方法研究

Study on Test Method for Dielectric Loss Factor of High Voltage Power Cable Based on Resonance Characteristic

根据串联谐振电路特性,建立一种新的高压电力电缆介质损耗因数计算模型,并提出一种新的基于串联谐振电路功率微分的介质损耗因数计算公式。基于谐振特性的交联聚乙烯高压电缆介质损耗因数测试模型,利用串联谐振的升(降)压阶段测试电缆的介质损耗因数,解决高电压大电容电缆介质损耗测试的难题。结果表明:电路参数仿真计算值、现场试验值与真实值均基本一致,与现有常规电桥法相比,基于谐振特性的介质损耗因数测试方法在一定程度上更加准确,为高电压大容量电力电缆的介质损耗因数测试提供参考。

According to the characteristics of series resonance circuit,a new model for calculating the dielectric dissipation factor of high-voltage power cable was established,and a new dielectric loss factor calculating formula derived from the differential power of the series resonance circuit was proposed.On the basis of test model,the dielectric dissipation factor of XLPE power cable was calculated by the step-up or step-down process of the series resonance to solve the problem of dielectric dissipation measuring of high voltage and large capacity cable.The results show that the simulation calculating values of circuit parameters and field test results match with the actual values.Compared with conventional electric bridge method,the test method for calculating dielectric dissipation factor based on the resonance characteristic is more accurate to a certain extent.This provides a reference for testing the dielectric dissipation factor of high voltage and high capacity power cable.