基于电导电流测试的硅橡胶复合绝缘子伞群材料老化特性分析  

Study on Aging Characteristics of Silicone Rubber Sheds of Composite Insulators Based on Conduction Current Test

作　　者：黄成才[1] 李永刚[1] 汪佛池[1] 张志猛[2] 

机构地区：[1]华北电力大学电气与电子工程学院,保定071003 [2]国网河北省电力公司电力科学研究院,石家庄050000

出　　处：《电工技术学报》2016年第2期252-259,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金重点项目(51207055);中央高校基本科研业务费专项资金重点项目(13MS71)资助

摘　　要：为利用电导电流测试手段探究复合绝缘子伞群材料的老化特性,以现场运行的复合绝缘子为试验对象进行研究。通过电导电流测试得到相关试样的电老化阈值,探究了伞群位置、运行年限、环境污秽及运行电压等级等因素对硅橡胶材料电导电流特性的影响规律,并利用傅里叶红外光谱技术分析了相关基团的变化情况。试验表明,绝缘子串上场强分布高的位置、运行年限较长的绝缘子及运行地区环境污秽严重的绝缘子,其伞群材料的电老化阈值较低、电导电流较大且内部陷阱数量较多;运行电压等级对绝缘子老化程度的影响较小。利用电老化阈值评估伞群试样的老化状态与傅里叶红外光谱分析结果具有高度的一致性,表明通过硅橡胶伞群材料的电导电流测试得到的电老化阈值,可以反映复合绝缘子伞群材料的老化特性。Taking being operated composite insulators as the object, the aging characteristics of composite insulators based on conduction current test is assessed. Electrical degradation threshold was got by the conduction current test, the influence of aging factors on electrical degradation threshold of the silicone rubber sheds such as shed locations, operating years, environment contamination levels and operating voltage levels were considered, and the changes of relevant groups of samples were studied with the Fourier transform infrared spectrum （FTIR） method. It is founded that the electrical degradation threshold of samples are lower, conduction current are larger and trap is more under the following situations： samples from the location where the electric field of the insulator string is higher; and samples from the insulators with a longer operation life or working in seriously polluted areas. The operation voltage almost has no influence on the aging state of insulators. Evaluating the sheds aging state by using the electric degradation threshold and FTIR analysis have high consistency, and indicates that electrical degradation threshold which got by the conduction current test can reflect the aging characteristics of silicone rubber sheds of composite insulators.

关 键 词：电导电流 电老化阈值 硅橡胶 复合绝缘子 老化特性 陷阱 

分 类 号：TM85[电气工程—高电压与绝缘技术]