【摘要】 针对现有绝缘子发热模型不能处理表面出现干燥带及干燥带电弧的问题,基于绝缘子表面水分蒸发主要取决于表面发热的假设,提出了一种湿污绝缘子发热分析方法。该方法引入污层表面电阻率、湿润强度、电弧模型,建立了干燥带及干燥带电弧产生的判断条件和不同运行状态绝缘子的发热模型及应用数值分析方法求解。计算机仿真结果揭示了不同运行状态绝缘子的表面发热分布规律、出现干燥带及干燥带电弧对泄漏电流和发热的影响。湿污绝缘子的红外热成像试验结果表明,该模型合理,具有建立污秽模型理论上的参考价值。更多还原

【Abstract】 As the existing heating models of insulators could not solve the problem of the presence of dry band or dry band arc on the insulator surface, a heating analytical method of polluted and wetted insulators is proposed on the assumption that water evaporation mainly depends on heat generation on the insulator surface. By introducing contamination layer surface resistivity, humid intensity and arc model, the judging condition of the generation of dry band or dry band arc and the heating model for each running state are developed and solved by numerical analysis method. The simulation results reveal the thermal distribution on the insulator surface and the impact of the presence of dry band or dry band arc on leakage current and heating. Infrared thermal imaging experiment results of polluted and wetted insulators indicate that the proposed model is reasonable and valuable for establishment of pollution model in theory.更多还原