中国电机工程学报2016，Vol.36Issue(24)：6664-6674,11.DOI:10.13334/j.0258-8013.pcsee.161815
直流电压下聚合物表面电荷测量方法及积聚特性
Measurement Method and Accumulation Characteristics of Surface Charge Distribution on Polymeric Material Under DC Voltage
摘要
Abstract
Charge accumulation on a solid insulator surface is one of the critical factors for the development of dc gas-insulated equipment since it will lead to the overstress of polymeric insulation due to local field distortion and enhancement. Therefore, it is significant to study the charge accumulation phenomenon on spacer surface under dc field. However, it remains an important subject to obtain the accurate results of surface charge distribution. Electrostatic probe method was used to measure the surface potential distribution of a cone-shaped spacer in a downsized gas-insulated line (GIL) and the inverse calculation method of the surface charge distribution, especially for this “shift-variant” configuration, was investigated. Numerical simulation was used to obtain the transfer matrix from charge density to the probe output. By a signal processing technique based on the Wiener filter, the ill-condition problem of the matrix was solved and the stability of the calculation was improved. The study also analyzed the spatial resolution and accuracy of the calculation results, which shows that the spatial resolution of the system can reach 1.8 mm. Based on the above method, we studied the charge accumulation phenomena of the epoxy spacer under dc voltage in air and SF6. The results show that there are two patterns in the charge distribution: “dominant uniform charging” and random “charge speckles”. The uniform charging was of the same polarity as the applied voltage, which indicates current flow from the solid bulk is the dominate mechanism in surface charging.关键词
表面电荷/电荷积聚/高压直流/静电探头/气体绝缘输电/气体绝缘输电线路/环氧树脂/维纳滤波Key words
surface charge/charge accumulation/HVDC/electrostatic probe/gas-insulated line/gas-insulated line (GIL)/epoxy resin/Wiener filter分类
信息技术与安全科学引用本文复制引用
张博雅,王强,祁喆,张贵新..直流电压下聚合物表面电荷测量方法及积聚特性[J].中国电机工程学报,2016,36(24):6664-6674,11.基金项目
国家重点基础研究发展计划项目(973项目)(2014CB 239502)。 The National Basic Research Program of China (973 Program)(2014CB239502) （973项目）
