染污绝缘子表面流注放电特性的实验研究

发布时间：2018-08-21 08:41

【摘要】：为了研究绝缘子表面污秽对流注传播的影响,在海拔高度为2 100 m的特高压实验基地,利用3电极结构进行了实验研究,比较了涂覆不同盐密和灰密污秽的绝缘子上的流注传播特性,并用Ansoft电磁场分析软件对涂覆污层前后绝缘子表面的电场分布进行了仿真计算。实验结果表明:流注的稳定传播电场强度随盐密的增大而先增大,在盐密超过0.10 mg/cm2后保持不变,随灰密的增大而升高;在外加电场强度大于稳定传播电场强度后,相同电场强度下,变化污秽层盐密、灰密对应的流注传播平均速度相差不大。通过仿真计算发现:污层的存在使得绝缘子表面的电场分布发生畸变,污区的电场明显减弱,污层两端电场增强;污层电导率的变化使得电场分布改变,从而导致涂污前后绝缘子表面流注放电脉冲波形在盐密、灰密变化时的稳定传播电场强度变化。
[Abstract]:In order to study the influence of insulator surface contamination on the propagation of streamer, an experimental study was carried out at an UHV experimental base at an altitude of 2 100 m with a 3 electrode structure. The characteristics of streamer propagation on insulators coated with different salt density and ash density pollution were compared. The electric field distribution on the insulator surface before and after the coating was simulated by Ansoft electromagnetic field analysis software. The experimental results show that the steady propagating electric field intensity of the flux increases first with the increase of the salt density, remains constant after the salt density exceeds 0.10 mg/cm2, and increases with the increase of the ash density, and when the applied electric field intensity is greater than the steady propagating electric field intensity, Under the same electric field intensity, the average velocities of streamer propagation are not different from each other when the pollution layer is salt-dense and the ash density is the same. It is found by simulation that the electric field distribution on the insulator surface is distorted by the existence of the polluted layer, the electric field in the polluted area is obviously weakened, the electric field at both ends of the fouling layer is enhanced, and the electric field distribution changes with the change of the conductivity of the polluted layer. Therefore, the steady propagation electric field intensity of streamer discharge pulse waveform on the surface of insulator before and after fouling changes with the change of salt density and ash density.
【作者单位】：清华大学深圳研究生院;中国电力科学研究院;
【基金】：国家重点基础研究发展计划(973计划)(2011CB209406) 国家自然科学基金(50777033;50977048) 电力系统国家重点实验室(SKLD11KZ02)~~
【分类号】：TM216

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