摘要
气体绝缘金属封闭开关设备(GIS)是电力行业中重要的开关设备,由于体积小,散热面积变小,局部发热问题不容忽视。传统的GIS采用SF6气体作为绝缘与灭弧介质,由于SF6气体会带来严重的温室效应,近年来充环保型气体的GIS的研究受到广泛关注,因此对环保型GIS热特性的研究刻不容缓。该文针对已开发的以CO2为绝缘灭弧气体的126kV环保型GIS隔离开关部分的热特性开展研究,通过电-热-气流场的耦合对GIS隔离开关进行稳态热分析,得到其温度场分布,并通过与温升实验的对比,验证了热分析模型的正确性。随后,利用该模型计算了充不同气体的GIS隔离开关部分的温度场,并对不同气压的SF6、CO2、N2以及N2与C5F10O混合气体的散热特性进行对比分析。结果表明,同一气压下充SF6气体比充CO2和N2的GIS最高温升低10K左右,在N2中混合10%的C5F10O可使GIS的温升降低4.21K。该研究可为环保型气体在GIS中的应用提供参考依据。
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.
作者
纽春萍
矫璐璐
王小华
杨爱军
李旭旭
Niu Chunping;Jiao Lulu;Wang Xiaohua;Yang Aijun;Li Xuxu(State Key Lab of Electrical Insulation for Power Equipment Xi’an Jiaotong University,Xi’an,710049,China;Pinggao Group Co.Ltd,Pingdingshan,467001,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第17期3765-3772,共8页
Transactions of China Electrotechnical Society
基金
230V三相变频交流接触器设计技术研究资助项目(MJ-2017-S-46)。
关键词
气体绝缘金属封闭开关设备
稳态热分析
环保型气体
散热特性
Gas insulated metal-included switchgear
steady thermal analysis
environmentally friendly gas
transfer heat performance
