Thermal Characteristics Analysis of Environmentally Friendly GIS Based on Multi-Field Coupling
Niu Chunping1, Jiao Lulu1, Wang Xiaohua1, Yang Aijun1, Li Xuxu2
1. State Key Lab of Electrical Insulation for Power Equipment Xi’an Jiaotong University Xi’an 710049 China 2. Pinggao Group Co. Ltd Pingdingshan 467001 China
Abstract Gas insulated metal-included switchgear (GIS) is an important switchgear equipment in the power system. Due to its small size and small heat-dissipation area, overheating problems cannot be ignored. Traditional GIS uses SF6 gas as insulation and arc extinguishing medium, while SF6 gas brings serious greenhouse effect. In recent years, GIS research on environmentally friendly gas has received extensive attention. Therefore, research on the thermal properties of environmentally friendly gas GIS is also urgent. In this paper, the thermal characteristics of the 126kV eco-friendly GIS isolating switch with CO2 as the insulating arc extinguishing gas was studied. The GIS model was subjected to steady-state thermal analysis through the coupling of electric-thermal-airflow field, and the temperature field of GIS was obtained. The distribution was compared with the temperature rise experiment results of GIS to verify the correctness of the thermal analysis model. Subsequently, the model was used to calculate the temperature field of the GIS isolation switch part filled with different gases, and the heat dissipation characteristics of SF6, CO2, N2 and N2 and C5F10O mixed gases at different pressures were compared. The results show that the SF6 gas at the same gas pressure is about 10K lower than the highest temperature of GIS filled with CO2 and N2. Mixing 10% C5F10O in N2 can reduce the temperature rise of GIS by 4.21K. The research in this paper can provide reference for the application of environmentally friendly gas in GIS.
Niu Chunping,Jiao Lulu,Wang Xiaohua等. Thermal Characteristics Analysis of Environmentally Friendly GIS Based on Multi-Field Coupling[J]. Transactions of China Electrotechnical Society, 2020, 35(17): 3765-3772.
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2020, Vol. 35 
