【摘要】 复合绝缘子运维经验表明界面发热是一种比较严重的缺陷形式。为了研究复合绝缘子界面发热对护套透水性能的影响，首先构建了复合绝缘子的热路模型，验证了该模型的有效性，推导了护套厚度对内外温升的影响，结果表明故障复合绝缘子的界面发热能力一定时，护套更厚的复合绝缘子界面缺陷处温度更高，护套表面温度更低。利用品红溶液渗透硅橡胶片，研究了复合绝缘子界面发热对硅橡胶透水的影响，结果表明溶液渗透深度与时间的平方根近似呈线性关系，温度越高，硅橡胶透水速度越快；分析了水分与温度对芯棒材料水解的影响，结果表明界面温度上升不仅促进了水汽的渗透，水汽含量的增加以及温度的升高会促进树脂与玻璃纤维丝的水解。研究工作可为发热复合绝缘子现场运维提供指导。更多还原

【Abstract】 The operation and maintenance experience of composite insulator shows that the interfacial heating is a relatively severe form of defect. For studying the influence of interfacial heating of composite insulator on the water permeability of sheath,a thermal circuit model of the composite insulator is constructed firstly, the effectiveness of the model is verified and the influence of sheath thickness on internal and external temperature rise is deduced. The results show that in case of constant interfacial heating capacity of faulty composite insulator,the temperature at the defect of interfacial of composite insulator with thicker sheath is higher,and the sheath surface temperature is lower.The influence of interfacial heating of composite insulator on the water permeability of silicone rubber is studied by using fuchsin solution to penetrate the silicone rubber sheet. The results show that the penetration depth of the solution is approximately linear with the square root of time. The higher the temperature is,the faster the water permeability of silicone rubber is. Moreever, the effects of water and temperature on the hydrolysis of core rod materials are analyzed. The results show that the increase of interfacial temperature has not only promoted the penetration of water vapor,but also the hydrolysis of resin and glass fiber filament with the increase of water vapor content and temperature.Theresearchworkcanprovideguidanceforon-siteoperationandmaintenanceofheatingcompositeinsulators.更多还原