周挺,唐信.特高压直流极母线避雷器污秽状况下内外部电场分布的仿真研究[J].电测与仪表,2023,60(5):92-96. Zhou Ting,Tang Xin.Simulation study of internal and external electric field of UHV DC polar bus arrester under pollution conditions[J].Electrical Measurement & Instrumentation,2023,60(5):92-96.
特高压直流极母线避雷器污秽状况下内外部电场分布的仿真研究
Simulation study of internal and external electric field of UHV DC polar bus arrester under pollution conditions
Because of the adsorption of pollution particles by DC electric field, the pollution of DC arrester is more serious than that of AC arrester. The UHV DC polar bus arrester also has three parallel resistor columns inside the insulation jacket, so the change of the surface electric field of the insulating jacket and the radial electric field between the resistor columns and the insulating jacket will have a certain impact on the operation of the arrester. According to the characteristics of pollution distribution in DC field, the electric field simulation model of UHV DC polar bus arrester under pollution is established in this paper. The electric field on the surface of umbrella skirt and the radial electric field between resistor columns and insulating jacket are calculated and analyzed when the overall pollution is not uniform and the local drying zone occurs. The results show that overall pollution of the arrester will lead to the increase of the surface electric field of insulating jacket and internal radial electric field, but the smaller value will not cause corona and flashover. However, the appearance of local drying zone will result in excessive surface flashover and redial field strength on the surface of umbrella skirt and the air gap, and the perforation discharge between resistor columns and insulating jacket, which will seriously endanger the safe and stable operation of the arrester.
