退役硅橡胶复合绝缘子的表面污秽及老化特性分析

Analysis of surface pollution and aging characteristics of retired silicone rubber composite insulators

以东南沿海的退役硅橡胶复合绝缘子为对象,采用扫描电子显微镜(SEM)/能量色散谱(EDS)、激光共聚焦显微拉曼、傅里叶红外光谱(FT-IR)、热重分析(TGA)及差示扫描量热仪(DSC)分析其伞裙硅橡胶的表面污秽及其老化特征,并与未服役的硅橡胶复合绝缘子进行对比。研究结果表明,相较未服役绝缘子(新绝缘子),退役硅橡胶复合绝缘子表面具有大量的污秽,并呈现大量裂纹及孔洞;同时废旧绝缘子中的O、Al、S元素的比例增加,而C、Si、Zn元素的比例相应减少,硅橡胶复合绝缘子在服役过程中出现了炭化现象;此外,退役硅橡胶复合绝缘子的热稳定性明显低于未服役绝缘子,且聚二甲基硅氧烷含量较低。

Taking the retired silicone rubber composite insulator in the southeast coast as the object,the surface pollution and aging characteristics of its umbrella silicone rubber were analyzed by Scanning electron microscope(SEM)/energy dispersion spectrum(EDS),laser confocal micro Raman,Fourier infrared spectroscopy(FT-IR),Thermogravimetric analysis(TGA)and differential scanning calorimetry(DSC),and compared with the silicone rubber composite insulator not in service.The research results indicate that compared to unused insulators(new insulators),retired silicone rubber composite insulators have a large amount of dirt on the surface,and exhibit a large number of cracks and holes.At the same time,the proportion of O,Al,and S elements in waste insulators increases,while the proportion of C,Si,and Zn elements correspondingly decreases.Silicone rubber composite insulators experience carbonization during service.In addition,the thermal stability of retired silicone rubber composite insulators is significantly lower than that of unused insulators,and the content of polydimethylsiloxane is relatively low.