摘要
为分析SF6/N2混合绝缘气体对气体绝缘金属封闭开关设备(GIS)母线温升的影响,对充有30%SF6~70%N2混合气体的单相GIS母线建立了电磁-流体-热多物理场耦合仿真模型。采用流体多组分传输的有限元分析方法,得到了GIS母线上电磁场与温度场的分布情况。结果表明:GIS内导体和壳体顶部温度均高于底部,温度呈左右对称、上高下低的梯状分布。外壳与导体的温升随负荷电流增大而增加;与环境温度间成线性关系;随着气体压强的增加温升渐渐降低;随着SF6气体组分的增加,导体温升降低的幅度逐渐变缓。所以当SF6气体在混合气体中的比例一定时,提高混合气体压强,能有效减少GIS导体的温升情况。通过搭建实验平台对仿真结果进行验证。研究结果有助于GIS母线温升的提前检测和预防,也能为混合环保气体在GIS中的推广应用提供理论依据。
To analyze the effect of SF6/N2 mixed insulating gas on the temperature rise of gas insulated metal-enclosed switchgear(GIS) bus bar,an electromagnetic-fluid-thermal multiphysics coupled simulation model was established for a single-phase GIS bus bar filled with 30%SF6~70%N2 mixed gas.The finite element analysis method of fluid multi-component transmission is used to obtain the distribution of electromagnetic field and temperature field on the GIS bus bar.The results show that the temperature at the top of the GIS inner conductor and the shell is higher than the bottom.The temperature is bilaterally symmetrical,it is distributed in a ladder shape with a higher top and a lower bottom.The temperature rise of the outer casing and the conductor increases with the increase of the load,and is linear with the ambient temperature.AS the gas pressure increases,the temperature rise gradually decreases,as the composition of the SF6 gas increases,the decrease in the temperature rise of the conductor gradually becomes slower.So when the proportion of SF6 gas in the mixed gas is constant,increasing the pressure of the mixed gas can effectively reduce the temperature rise of the GIS conductor.The simulation results are verified by setting up an experimental platform.The research results contribute to the early detection and prevention of GIS bus bar temperature rise.It can also provide a theoretical basis for the promotion and applic ation of mixed environmental protection gas in GIS.
作者
杨桢
任玲玲
王凯
李鑫
YANG Zhen;REN Lingling;WANG Kai;LI Xin(Faculty of Electrical and Control Engineering,Liaoning Technical University,Liaoning Huludao 125105,China;State Grid Liaoning Electric Power Co.,Ltd.,Huludao Power Supply Company,Liaoning Huludao 125105,China)
出处
《高压电器》
CAS
CSCD
北大核心
2021年第1期48-54,共7页
High Voltage Apparatus
基金
国家自然科学基金青年基金资助项目(51604141)
辽宁省教育厅基金资助项目(LJYL016)
辽宁省自然科学基金资助项目(20170540427)。
