霉菌染污状态下硅橡胶复合绝缘子的沿面闪络特性分析  

Analysis on surface flashover characteristics of silicone rubber composite insulators under mold contamination

作　　者：陈天羽 杨世芳 刘云鹏[1] 李泳霖 耿江海[1] 王瑶[1] 贾志东 夏云峰 CHEN Tianyu;YANG Shifang;LIU Yunpeng;LI Yonglin;GENG Jianghai;WANG Yao;JIA Zhidong;XIA Yunfeng(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense,North China Electric,Power University,Baoding 071003,China;State Grid Jinan Power Supply Company,Jinan 250000,China;Shenzhen Graduate School of Tsinghua University,Shenzhen 518055,China;Power Transmission Operation&Maintenance Branch,Hainan Power Grid Co.,Ltd.,Haikou 570203,China)

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,河北保定071003 [2]国网济南供电公司,山东济南250000 [3]清华大学深圳国际研究生院,广东深圳518055 [4]海南电网有限责任公司输电运检分公司,海南海口570203

出　　处：《绝缘材料》2023年第11期94-100,共7页Insulating Materials

基　　金：国家自然科学基金青年资助项目(52207154);中央高校基本科研业务费专项资金资助项目(2023MS104)。

摘　　要：硅橡胶复合绝缘子在湿热地区中运行其表面存在霉菌附着引起的微生物染污问题,霉菌作为一种特殊的生物污秽对硅橡胶绝缘子性能的影响尚不明确。本文对悬式绝缘子串进行霉菌染污,并在不同污秽等级下对绝缘子串沿面闪络特性进行分析,通过憎水性分析、扫描电镜以及红外光谱3种微观测试方法研究霉菌浓度对绝缘子沿面闪络特性的影响。结果表明:对于同一污秽等级的绝缘子,当存在霉菌污染时,相较于无霉菌染污的绝缘子,霉菌对硅橡胶表面结构造成破坏,导致硅橡胶憎水性显著降低,进而造成闪络电压大幅降低,与对照组相比,沿面闪络电压最低可下降至原始水平的76%;但在同一污秽等级下,霉菌浓度达到107个/cm2时,沿面闪络电压下降出现拐点,下降速度放缓并趋于饱和状态。综上,霉菌的附着行为与硅橡胶自然老化协同作用使霉菌菌丝在绝缘子表面形成微型孔洞,导致有机硅橡胶分子链断裂,降低了绝缘子的闪络电压,影响了硅橡胶绝缘子的稳定运行。The silicone rubber composite insulators operating in humid and hot areas has the problem of microbial contamination caused by mold adhesion,and the effect of mold as a special biological pollution on the performance of silicone rubber insulators is still unclear.In this paper,the suspended insulator strings were contaminated by mold,and their surface flashover characteristics were analyzed under different pollution levels.The influence of mold contamination on the surface flashover properties of insulator was studied by hydrophobicity analysis,scanning electron microscopy,and infrared spectroscopy.The results show that for the insulators with the same pollution level,when there is mold pollution,the mold would damage the surface structure of silicone rubber compared with insulators without mold pollution,resulting in a significant decrease in the hydrophobicity of silicone rubber,and thus the flashover voltage is reduced significantly.Compared with the control group,the surface flashover voltage can be reduced to 76%of the original level at the lowest.However,under the same pollution level,when the mold concentration reaches 107 pcs/cm2,there is an inflection point for the decrease of surface flashover voltage,and the decline rate slows down and tends to saturation.In summary,the synergistic effect of mold adhesion behavior and natural ageing of silicone rubber makes the mold mycelium form micro holes on the surface of insulator,resulting in the breakage of silicone rubber molecular chain,reducing the flashover voltage of insulator,and affecting the stable operation of silicone rubber insulators.

关 键 词：霉菌 硅橡胶 闪络电压 憎水性 微观测试 

分 类 号：TM215[一般工业技术—材料科学与工程]