Rain Flashover Analysis of HVDC Reactor Bushing Using Rainwater-Air Mixture Model
Deng Wanting1,2, Zhang Bo1, Wang Tao1, Li Liang3
1.Key Laboratory of High Voltage Field Test Technique of SGCC Hubei Electric Power Research Institute State Grid Hubei Electric Power Company Wuhan 430077 China 2.School of Electrical Engineering Wuhan University Wuhan 430072 China 3.State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China
Abstract：Rain flashover analysis has always been a hotspot in the high voltage insulation research.By using finite-element method,a rain flashover fault in the HVDC bushing of 500 kV reactor has been analyzed.In order to simulate the electric field of the HVDC bushing in the rain,the rainwater and air are assumed as one mixture with equivalent material properties,which are determined by their proportion respectively.Hence,by using the equivalent material properties in the mixture model,the coupling of fluid flow-electric field can be implemented.Simulation results indicate that the rain flashover is more likely to occur on the upper end of the bushing.Owing to the collision and aggregation in the rainwater-air mixture,the electric field intensity in the rain on the upper end of the bushing increases significantly compared to that in the dry environment.Compared with the scene photographs,the actual position where rain flash occurred agrees well with simulations and the veracity is validated.
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2017, Vol. 32 
