超重污秽环境下输电线路绝缘配置校核及优化方法

Checking and Optimization of Transmission Line Insulation Configuration in Overweight Pollution Environment

输电线路运行环境广阔且复杂,不可避免的需经过一些特殊区域,例如超重污秽环境区域;超重污秽环境下输电线路反复发生污闪跳闸,按照e级污秽上限进行绝缘配置并进行绝缘子复合化处理,仍未解决污闪问题。因此,论文通过一起500kV输电跳闸故障,对线路绝缘配置进行校核计算,旨在提出超重污秽环境下输电线路绝缘配置校核及优化方法。论文首先对超重污秽环境下的线路绝缘子进行污秽等级与污闪电压测试,根据测试结果进行了输电线路绝缘配置校核,最后提出了适用于重污秽条件下的污闪模型。研究发现:发生污闪地区污秽程度非常严重,其中悬垂串复合绝缘子盐密最高值可达1.136mg/cm^(2),远高于现行标准污区分布最高污秽等级;其次,高污秽易使防污闪涂料RTV涂层憎水性和憎水迁移性能下降,降雪或覆冰易导致RTV涂层憎水性短暂丧失,此环境中使用防污闪涂料应对绝缘配置进行重新校核;最后通过对计算模型的绝缘子表面有效电导率以及电弧特性常数的修正,将重污秽度下闪络模型平均误差从20.16%降低至11.11%,减小了校核计算的误差。论文研究结果为今后高污秽环境区域的线路绝缘配置计算提供重要的参考依据。

The operating environment of transmission lines is vast and complex,and it is inevitable to pass through some special areas,such as overweight pollution areas.Under the overweight pollution environment,the pollution flashover of transmission line insulator strings occurs repeatedly,and the insulation configuration and composite treatment of insula-tors according to the e-level pollution upper limit have not yet solved the pollution flashover problem.Therefore,we verified and calculated the insulation configuration of transmission lines through a 500 kV transmission trip fault,aiming to propose methods for verifying and optimizing the insulation configuration of transmission lines in overweight pollution environments.Firstly,we conducted pollution level and pollution flashover voltage tests on line insulators in overweight pollution environments.Based on the test results,the insulation configuration of transmission lines was verified.Moreo-ver,a pollution flashover model suitable for heavy pollution conditions was proposed.Research reveals that the pollution level in areas where pollution flashover occurs is very severe,with the highest salt density value of suspension string composite insulators reaching 1.136 mg/cm^(2),which is far higher than the current standard pollution level in the distribu-tion of pollution areas.Secondly,high pollution can easily lead to a decrease in the hydrophobicity and migration performance of the anti-fouling flashover of RTV coating.Snow or icing can easily cause a brief loss of hydrophobicity of the RTV coating.In this environment,the use of anti-fouling flashover coating should be re-checked for insulation con-figuration.Finally,by correcting the effective conductivity of the insulator surface and the arc characteristic constant of the calculation model,the average error of the flashover model under heavy pollution was reduced from 20.16%to 11.11%,reducing the error of the verification calculation.The research results of the paper provide important reference basis for the calculation of line insulation configuration in high pollution environment areas in the future.