电器与能效管理技术Issue(4)：1-7,7.DOI:10.16628/j.cnki.2095-8188.2026.04.001
直流小型断路器触头分离金属液桥过程研究
Research on Metal Liquid Bridge During Contact Separation in DC Miniature Circuit Breaker
摘要
Abstract
To clarify the evolution law of metallic liquid bridges and the inducing mechanism of double liquid bridges during the contact separation process of DC miniature circuit breakers(MCB),a slow-breaking experimental platform equipped with a high-power electron microscope is established.Taking copper(Cu)and CuCr0.5 alloy as contact materials,the characteristics of metallic liquid bridges are systematically investigated under the conditions of DC 13 V load,current ranging from 16 A to 22 A,and breaking speed between 0.4 mm/s and 1.0 mm/s,with the synchronous collection of geometric parameters and waveform data.The results show that the evolution of liquid bridges undergoes three stages:heating and melting,stable existence,and unstable rupture.The stable liquid bridge presents a cylindrical shape;after rupture,a needle-shaped residue forms on the cathode,and the material migrates directionally from the anode to the cathode.The size of liquid bridges increases with the rise of current and decreases with the increase of breaking speed.An increase in current tends to induce double liquid bridges,and their rupture is prone to trigger arc discharge.The CuCr0.5 alloy contacts completely suppress the occurrence of double liquid bridges,exhibiting significantly superior resistance to liquid bridges and arc discharge compared with pure copper contacts.关键词
直流小型断路器/金属液桥/慢速断开/CuCr0.5合金/双液桥Key words
DC miniature circuit breaker/metallic liquid bridge/slow breaking/CuCr0.5 alloy/double liquid bridge分类
信息技术与安全科学引用本文复制引用
薛渊,李静,段薇,黄翀阳,付思..直流小型断路器触头分离金属液桥过程研究[J].电器与能效管理技术,2026,(4):1-7,7.基金项目
国家自然科学基金(51407120) （51407120）
辽宁省科技计划联合计划(技术攻关计划项目)(2024JH2/102600224) （技术攻关计划项目）
辽宁省科技计划联合计划(自然科学基金-面上项目)(2024-MSLH-366) （自然科学基金-面上项目）
