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Aging State Detection Method of Composite Insulator Silicone Rubber Based on Microwave Transmission Method
Li Peng1,2, Li Zijin1,2, Wang Shenhua3, Wu Tian1,2, Pu Ziheng1,2
1. Hubei Provincial Engineering Technology Research Center for Power Transmission Line China Three Gorges University Yichang 443002 China;
2. College of Electrical Engineering & New Energy China Three Gorges University Yichang 443002 China;
3. State Grid Zhejiang Wuyi Electric Power Supply Company Jinhua 321200 China

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Abstract  

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 S21 (transmission coefficient) and ΔS21 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 waveguide. Finally, by establishing an actual 10 kV composite insulator simulation model, the local aging state was detected by the microwave transmission method, and the effectiveness of the method is further verified. At the same time, the mean values of electric field intensity and magnetic field intensity in the shed under different aging degrees were calculated, and the aging state detection mechanism of composite insulators based on microwave transmission method was obtained.
Through the above research and analysis, the results show that, when the aging degree of silicone rubber is different, the amplitude of S21 has obvious differences. When the lift-off distance is 6 mm and the microwave frequency is 4.17 GHz, the detection effect is better. With the deepening of the aging degree, the amplitude of S21 decreases and the amplitude of ΔS21 increases gradually. The aging degree and aging location of silicone rubber can be effectively identified by moving scanning detection of rectangular waveguide. For the actual 10 kV composite insulator, the local aging state can also be detected. When the insulator is aging, due to the increase of the relative dielectric constant and dielectric loss factor, the values of electric field and magnetic field intensity in the aging region decrease under the microwave action, thus leading to the change of microwave transmission parameters. Hence, the aging state of composite insulators can be detected by analyzing the change of microwave transmission parameters.
Key words： Composite insulator      silicone rubber      microwave transmission method      aging detection      scattering parameters     
Received: 13 January 2023     
PACS: TM931  
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Li Peng
Li Zijin
Wang Shenhua
Wu Tian
Pu Ziheng
Cite this article:   
Li Peng,Li Zijin,Wang Shenhua等. Aging State Detection Method of Composite Insulator Silicone Rubber Based on Microwave Transmission Method[J]. Transactions of China Electrotechnical Society, 0, (): 143-143.
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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L10017     OR     https://dgjsxb.ces-transaction.com/EN/Y0/V/I/143
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