摘要
栅片材料与结构对断路器的灭弧性能有着重要的影响。该文建立了永磁体作用下灭弧室内磁场的计算模型与电弧磁流体动力学(MHD)模型,实现了两者的耦合。在此基础上,对永磁体作用下栅片材料与栅片结构对电弧动态特性的影响进行了仿真,同时考虑电源极性的影响,得出了永磁体作用下灭弧室内磁场的空间分布、电磁耦合作用下灭弧室内温度分布与气流分布,提取了灭弧室内平均温度与电弧燃弧时间等关键参数,讨论了栅片材料与栅片结构对电弧特性的影响。结果表明,外施磁场作用下铁栅片会造成灭弧室内磁短路现象。相同仿真条件下,含铁栅片的灭弧室燃弧时间最长;动触头作为阳极更有利于弧根跃迁,燃弧时间缩短;当分断电流相同时,铜-绝缘栅片对电弧的冷却效果最佳;栅片倾角可以改变气流场分布,从而影响燃弧时间。
The material and structure of splitter plates have significant influence on the arc extinguishing performance of circuit breaker.The magnetic field calculation model and arc magnetohydrodynamic(MHD)model were established in this paper under the action of permanent magnet and the two models are coupled.The influences of splitter plates material and splitter plates structure on arc dynamic characteristics under the action of permanent magnet were simulated and analyzed on the basis of the models with considering the influence of the polarity of the power source.The spatial distribution of magnetic field in arc chamber under the action of permanent magnet,temperature distribution and air flow distribution in arc chamber under the action of electromagnetic were obtained.The key parameters such as average temperature in arc chamber and arc duration time were extracted,and the effects of splitter plates material and splitter plates structure on arc characteristics were discussed.The results show that the iron splitter plates will cause magnetic short circuit phenomenon in arc chamber under the action of external magnetic field.Under the same simulation parameters,the arc duration time with iron splitter plates in arc chamber is the longest,and the moving contact as the anode is more conducive to arc root commutation so as to shorten arc duration.For the same interrupting current,the cooling effect of copper-insulated splitter plates are the most effective.Airflow field distribution can be distorted by the inclination angle of splitter plates,which affects the arc duration time.
作者
彭世东
李静
曹云东
刘树鑫
于龙滨
Peng Shidong;Li Jing;Cao Yundong;Liu Shuxin;Yu Longbin(Key Lab of Special Electric Machine and High Voltage Apparatus College of Electrical Engineering Shenyang University of Technology,Shenyang 110870 China;State Grid Liaoning Electric Power Research Institute,Shenyang 110006 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2022年第21期5587-5597,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51977132)
辽宁省重大科技专项(2020JH1/10100012)
辽宁省教育厅面上项目(LJKZ0126)资助。
关键词
直流空气断路器
空间磁场分布
栅片材料
栅片倾角
电源极性
DC air circuit breaker
spatial magnetic field distribution
splitter plates material
inclination angle of splitter plates
polarity of power source
