摘要
熔焊现象是继电器最为严重的故障形式之一。分析了产生动熔焊的3种时刻,分别为动、静触点闭合接触瞬间,接触短弹跳分离瞬间和触点弹跳后的闭合接触瞬间。实验表明,第2种是最为重要的。提出了两种熔焊机理——液桥熔焊和熔池熔焊。由于熔焊依赖于触点冷却阶段而不是加热过程中的侵蚀,故侵蚀多的材料未必一定容易发生熔焊。要提高继电器触点的抗熔焊能力,一要降低触点弹跳;二要选用合适的触点材料。
Welding is one of the worst fault for the electromagnetic relay. The 3 possible time points of welding occurrence, which includes the touching instant when contacts close, separation stage when contact bounces and closing instant after contact bounces, were analyzed. Experiment shows that the second one is the most important. Two kinds of welding mechanism which are molten bridge welding and molten pool welding were suggested. Materials with more erosion do not mean more possibility of welding since welding depends upon the cooling stage of contact but the erosion on heating stage. It will be helpful for improving welding resistance if decreasing the possibility of contact bounce and selecting suitable contact materials.
出处
《低压电器》
北大核心
2007年第5期1-3,28,共4页
Low Voltage Apparatus
基金
国家自然科学基金资助项目(50477044)
关键词
电磁继电器
熔焊
液桥
短弧
冷却
electromagnetic relay
welding
molten bridge
short arc
cooling
