线路避雷器阻性泄漏电流在线监测中的相间干扰分析研究

Analysis of Interphase Interference for On-Line Monitoring Resistive Leakage Current of Line Arresters

氧化锌避雷器(MOA)阻性泄漏电流在线监测过程中会受到相间干扰的影响而难以判断避雷器的真实运行状态。以110 k V和220 k V输电线路避雷器为例,通过试验和有限元建模分析,计算出单相避雷器和三相避雷器的电阻片本体电容、电阻及部分电容参数,通过分析110 k V和220 k V线路避雷器的电位分布云图,验证了本文所建模型的有效性。依据所建立的阻容网络模型,仿真计算出单相避雷器和三相避雷器的阻性泄漏电流和相角差,通过对比单相避雷器和三相避雷器的仿真结果,计算出线路避雷器在线监测中应补偿的角度,有效消除了线路避雷器在线监测过程中的相间干扰。

During measuring the resistive leakage current of MOA, it＇s difficult to judge the actual state of MOA accurately because of the influence of the interphase interference. Taking 110 kV and 220 kV line arresters as an example, the capacitance and resistance of the valve block and the stray capacitances are calculated through the test and the finite element method respectively. The effectiveness of the calculated model is verified by analyzing the potential distribution of the 110 kV ~nd 220 kV line arresters. Based on the established resistance-capacitance （R-C） network model, the total leakage current, the resistive leakage obtained through the calculation. Analyzing compensated angles of on-line monitoring interference can be eliminated effectively. current and phase angle difference of arresters can be the one-phase and three-phase simulating results, the the line an＇esters can be obtained, and the interphase