Interfacial Electric Field Optimization of DC Tri-Post Insulator Based on Gradient Surface Conductance Regulation
Hu Qi1, Li Qingmin1, Liu Zhipeng2, Liu Heng2, A. Manu Haddad3
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China; 2. Beijing Key Lab of HV and EMC North China Electric Power University Beijing 102206 China; 3. Advanced High Voltage Engineering Research Centre Cardiff University Cardiff CF24 3AA UK
Abstract：Electric field concentration at the gas-solid interface and the insert-epoxy interface is considered to be the principal culprit that leads to surface flashover and outrigger burst of the DC tri-post insulator. Previously available structure optimization encounters difficulty in effectively addressing the electric field distribution of the two interfaces simultaneously, which poses imperative challenge for practical solutions. In the proposed research of this paper, the electric field distribution characteristics of the DC tri-post insulator interfaces were studied by electric-thermal-fluid multi-physics simulations, which indicated interfacial charge accumulation contributed most of the electric field concentration. A joint control strategy of electric field for dual-interfaces of the tri-post insulators based on "U-shaped" gradient conductance was proposed. Through synergistic utilization of high-conductivity coating for the insert-epoxy interface and non-linear conductivity coating for the gas-solid interface, the bulk conductance and surface conductance of the tri-post insulator present a "U-shaped" gradient distribution, which will reduce the internal and surface charge accumulation of the insulator, thereby optimizing the interfacial electric field distribution. The regulation effect of the dual interfacial coatings on electric field concentration was then studied, and the conductivity parameters of the coatings were optimized based on hybrid regulation targets for both electric field and power loss control. The presented research showed that, if the insert-epoxy interface coating conductivity was controlled less than 10-12S/m and the nonlinear gas-solid interface coating conductivity was well above the "saturation critical line", the maximum e-field strength of the insert-epoxy interface decreased from 4.48kV/mm to 0.04kV/mm, while the maximum tangential field strength of the gas-solid interface decreased from 2.47kV/mm to 1.73kV/mm. Parameter-optimized dual interfacial gradient conductance coatings can effectively suppress the interfacial electric field concentration, and the maximum electric field strength as well as the power loss can also be controlled within an allowable range, which provides fundamental reference for optimal design of high-voltage DC tri-post insulators.
胡琦, 李庆民, 刘智鹏, 刘衡, A. Manu Haddad. 基于表层梯度电导调控的直流三支柱绝缘子界面电场优化方法[J]. 电工技术学报, 2022, 37(7): 1856-1865.
Hu Qi, Li Qingmin, Liu Zhipeng, Liu Heng, A. Manu Haddad. Interfacial Electric Field Optimization of DC Tri-Post Insulator Based on Gradient Surface Conductance Regulation. Transactions of China Electrotechnical Society, 2022, 37(7): 1856-1865.
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2022, Vol. 37 
