电器与能效管理技术Issue(4)：30-37,8.DOI:10.16628/j.cnki.2095-8188.2024.04.004
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
摘要
Abstract
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Key words
DC/air arc/arc root stagnation of the contact edge/magneto-hydro-dynamics(MHD)/breaking speed分类
信息技术与安全科学引用本文复制引用
包玉良,李静,段薇,彭世东,刘树鑫..直流开断中触头边缘弧根停滞现象及影响因素研究[J].电器与能效管理技术,2024,(4):30-37,8.基金项目
辽宁省教育厅面上资助项目(LJKZ0126) （LJKZ0126）
