摘要
室温硫化硅橡胶(RTV)防污闪涂料因具有良好的防污闪作用,在我国电力系统得到了大量应用。然而,受长期积污、材料老化、短时快速积污、外力破坏等因素的影响,绝缘子表面涂层的憎水性状态会发生显著变化,这对于线路绝缘子耐污闪能力可能存在较大影响。为此,基于现场获得的运行多年的RTV涂层绝缘子,对不同表面憎水性状态下的绝缘子耐污闪能力进行了试验分析,同时根据现场RTV涂层的极端憎水性分布状态,人工模拟了具有不同表面憎水性状态的组合界面绝缘子,通过试品绝缘子在长时间污耐受试验中的泄漏电流变化,分析了绝缘子表面不同部位憎水性的作用。试验结果表明,线路RTV涂层绝缘子伞裙下表面憎水性对绝缘子耐污闪能力起主要作用,此外,具有整体憎水性的污层,以及上、下表面憎水性污层在污秽试验中所反表现的不同步受潮过程,也是保持RTV涂层绝缘子在长时间过饱和受潮状态下具有较高耐污闪电压的重要因素。根据试验结果和受潮过程分析,建议对运行绝缘子的憎水性进行检测时,采用为以伞裙下表面为主、上表面为辅的判别方法。
Because of superior anti-pollution flashover property,room temperature vulcanized silicone rubber coating（RTV coating） is widely applied in Chinese power system.Based on the RTV coated insulators energized for many years,the anti-pollution flashover abilities were studied in various hydrophobic states via pollution test.Furthermore,based on the hydrophobicity distribution state of various site RTV coated insulators,hydrophobic insulators with combined interface were created to simulate the extreme distribution state of hydrophobicity.Then,the ability of hydrophobicity on different position to prevent pollution flashover are investigated via the characters of the leakage currents during the long-term voltage withstand pollution test.Experimental results show that,the hydrophobic states under the surface of the insulators play an important role in increasing or maintaining the anti-pollution flashover abilities.In addition,both the hydrophobic pollution layer covered on the whole insulator and the difference of wetting process under and below the surface also greatly affect the anti-pollution flashover voltage of RTV coated insulators.Thereby,a new discrimination method is recommended to inspect and judge the hydrophobicity of insulators,primarily judging by the hydrophobic state of under surface and secondarily by the hydrophobic state of upper surface being.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第2期284-289,共6页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2011CB2094062009CB724500)~~
关键词
绝缘子
防污闪
憎水性
室温硫化硅橡胶
泄漏电流
湿润过程
标准
insulator
anti-pollution flashover
hydrophobicity
RTV coating
leakage current
wetting process
standard
