运行多年RTV涂料绝缘子表面涂层老化分析研究

室温硫化硅橡胶涂料(RTV涂料)可以有效防止污闪事故，已在我国电力系统中广泛应用。文中通过取得大量在天津挂网运行多年老化的RTV涂料绝缘子，在对其表面憎水性和积污状况研究的基础上，进行了两种状态下试品防污闪能力测试，结果表明试品仍具有良好的防污闪能力。通过绝缘子试品表面涂层的红外分析对比，讨论了线路周边污染源环境对RTV涂层的不同影响。针对RTV涂料国内比较保守的寿命定义，通过热重分析，引入胶含量的概念，结合防污闪性能及红外谱图的变化，提出了对RTV涂料寿命评估新的参考方法，并对RTV涂料在不同运行条件下的实际使用寿命给出了指导性意见。

AGING STUDY ON RTV COATING COVERED ON INSULATORS AND ENERGIZED FOR MANY YEARS

Room Temperature Vulcanized (RTV) silicone rubber coating can prevent pollution flashover accident from happening, and it has been widely used in China. Lots of sample insulators are taken down from transmission lines in Tianjin directly without cleaning, then the hydrophobicity classes of samples are investigated and their electrical performances are compared with new RTV coated insulators and porcelain insulators. Then Fourier Transform Infrared Spectroscopy (FTIR) is employed to investigate the inherent property change of coating and influence by pollution source. Based on all results, the using life of RTV coating is suggested by a new way, Thermogravimetry (TG) analysis, which suggests the different using life in different places.