直流接触器软连接触头

Abstract

直流接触器分断过程中，电弧对触头的烧蚀作用较为强烈，导致触点间接触电阻增加，严重影响触头的使用寿命。本文在传统低压直流接触器基础上提出一种带有软连接装置和片弹簧的新型双断点触头结构。这种新型触头结构在使用过程中动、静触点间会产生带有接触压力的相对滑动，可以清除触点表面氧化物，减小接触电阻，从而实现触头自清洁功能，提高使用寿命。本文从结构形变和电–热耦合的角度分别进行了仿真分析，仿真结果体现出触头动、静触点相对滑动的过程，新触头结构可以实现自清洁功能，且温升情况合理。该方案具有体积小，成本低，开断电压等级高的优点。 In the DC contactor breaking process, the arc ablation of the contact is more intense, resulting in increased contact resistance between the contacts, which seriously affect the life of the contacts. On the basis of the traditional contactor, this paper presents a new double break point contact structure of DC contactor with soft connection and leaf springs. This new contact structure will produce a relative sliding movement with contact pressure during use, can clear the contact surface oxides and reduce the contact resistance, in order to achieve the contacts self-cleaning function, im-prove service life. The moving contact and the static contact of this new structure will produce a relative sliding move-ment with a contact pressure during use, which clearing the oxide on the contact surface, reducing contact resistance, that achieve the contact self-cleaning function, improve service life. This article makes the analysis from the perspective of structural deformation and electrical-thermal coupling. The simulation results show that this new type of contact structure contacts can effectively achieve the self-cleaning function, and the temperature rise is reasonable. The program has the advantages of small size, low cost, breaking high-voltage level.