基于微波透射法的复合绝缘子硅橡胶老化状态检测方法  

Aging State Detection Method of Composite Insulator Silicone Rubber Based on Microwave Transmission Method

作　　者：黎鹏 黎子晋 王申华 吴田 普子恒[1,2] Li Peng;Li Zijin;Wang Shenhua;Wu Tian;Pu Ziheng(Hubei Provincial Engineering Technology Research Center for Power Transmission Line China Three Gorges University ,Yichang 443002 China;College of Electrical Engineering&New Energy China Three Gorges University, Yichang 443002 China;State Grid Zhejiang Wuyi Electric Power Supply Company, Jinhua 321200 China)

机构地区：[1]湖北省输电线路工程技术研究中心(三峡大学),宜昌443002 [2]三峡大学电气与新能源学院,宜昌443002 [3]国网浙江省电力有限公司武义供电公司,金华321200

出　　处：《电工技术学报》2023年第23期6503-6513,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51807110)。

摘　　要：该文提出了基于微波透射法的复合绝缘子硅橡胶老化检测数值模拟方法,开展了硅橡胶材料微波检测试验,验证了数值模拟方法的有效性;根据老化规律定义了硅橡胶不同老化状态,通过矩形波导固定扫频检测,分析了透射系数S_(21)幅值的变化规律,确定了最佳检测参数;采用波导移动扫描方法,研究了微波对硅橡胶局部老化程度和位置的检测效果;通过实际10 kV复合绝缘子局部老化微波无损检测,进一步验证了该方法的有效性。研究结果表明:硅橡胶不同老化状态下,S_(21)幅值有明显差异;当提离距离为6 mm、检测频率为4.17 GHz时,通过ΔS_(21)幅值大小及幅值变化区域可有效识别硅橡胶的老化程度和位置。该研究对于复合绝缘子老化状态的无损检测具有重要意义。Composite insulator has been widely used in power systems due to the advantages of strong anti-pollution flashover capability,good insulation performance and high mechanical strength.However,in long-term operation of composite insulator,under the influence of electro-thermal aging and complex external environment,the silicone rubber sheds of composite insulator will be aged,resulting in a decline in insulation performance,which will increase the risk of transmission line flashover trip.Hence,it is necessary to propose a method that can effectively detect the aging state of composite insulator.Firstly,the aging detection principle of composite insulator silicone rubber shed based on microwave transmission method was described in detail,and the numerical simulation method for aging detection of silicone rubber based on microwave transmission method was proposed.Then the microwave detection test of silicone rubber material was carried out,and the effectiveness of numerical simulation method was verified by comparison of simulation and experimental results.Secondly,the numerical simulation analysis of microwave detection for silicone rubber models under different aging conditions was carried out.According to the aging law of composite insulator,the parameters of silicone rubber models with different aging states were defined.For the whole aging silicone rubber model,the fixed position scanning frequency detection by rectangular waveguide was conducted,and the variation of S_(21)(transmission coefficient)andΔS_(21) amplitude under different aging degrees of silicone rubber was analyzed.The influence of lift-off distance and microwave operating frequency was studied,and the best fixed frequency detection parameters were determined.Thirdly,considering the actual insulator silicone rubber sheds have local aging condition,the local aging model of silicone rubber was built,and the detection effects of microwave on the local aging degree and position of silicone rubber model were studied by moving scanning method of wavegu

关 键 词：复合绝缘子 硅橡胶 微波透射法 老化检测 散射参量 

分 类 号：TM931[电气工程—电力电子与电力传动]