直流开断中触头边缘弧根停滞现象及影响因素研究  

Research on Arc Root Stagnation of Contact Edge Phenomenon and Influencing Factors in DC Interruption

作　　者：包玉良 李静[1] 段薇 彭世东 刘树鑫[1] BAO Yuliang;LI Jing;DUAN Wei;PENG Shidong;LIU Shuxin(Institute of Electrical Apparatus New Technology and Application,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学电器新技术与应用研究所,辽宁沈阳110870

出　　处：《电器与能效管理技术》2024年第4期30-37,共8页Electrical & Energy Management Technology

基　　金：辽宁省教育厅面上资助项目(LJKZ0126)

摘　　要：弧根演化过程对直流空气断路器的开关效率有显著影响。基于空气电弧磁流体动力学(MHD)模型,对触头边缘弧根停滞的根本原因进行仿真分析,得出外磁场大小和开断速度对触头边缘弧根停滞的影响。结果表明,弧根从触头转移至跑弧道是通过击穿完成的,触头边缘弧根停滞是弧根转移前跑弧道未达到击穿条件导致的。触头边缘弧根停滞时间随磁感应强度的增大而减少,并减少速度变慢,最后趋于稳定;燃弧初期,一定范围内提高触头开断速度有利于减少弧根停滞时间,但受洛伦兹力和气流场的双重影响,过高的开断速度对减少电弧停滞时间的效果减弱。The evolution of arc root has an important effect on the switching efficiency of DC air circuit breaker.Based on the magneto-hydro-dynamics(MHD)model,the essential cause for the arc root stagnation of the contact edge was simulated and analyzed.The effects of the external magnetic field and breaking speed for the arc root stagnation of the contact edge were obtained.The results show that the transfer of the arc root from the contact to the arc runner is completed through breakdown.The arc root stagnation of the contact edge is formed because the arc runner has not reached the breakdown condition before the arc root transfers.With the increase of magnetic field intensity,the arc root stagnation time of the contact edge decreases,and the ability to shorten the arc root stagnation of the contact edge becomes weak,eventually tends to be saturated.At the initial stage of arcing,increasing the contacts breaking speed within a certain rang is conducive to reduce the arc root stagnation time.However,excessively increasing the contacts breaking speed has a weak effect on reducing the arc root stagnation time under the influence of Lorentz force and airflow field.

关 键 词：直流 空气电弧 触头边缘弧根停滞 磁流体动力学 开断速度 

分 类 号：TM561[电气工程—电器]