接触器式继电器的失效分析

Failure Analysis of Contactor Relay

接触器式继电器广泛用于电气系统中,但接触器式继电器的触点经常发生接触不良,导致电气控制系统无法可靠地正常运行。对接触器式继电器发生接触不良的失效机理进行研究,分别对目前普遍采用的触点形式和常用的银-铜(Ag-Cu)和银-镍(Ag-Ni)复合触点的接触器式继电器进行可靠性试验,由试验结果分析不同触点形式的失效水平,对失效的接触器式继电器触点利用扫描电镜进行表面分析(SEM)和触点表面能谱图(XES)分析,分析产品失效的主要原因,进而找出减少接触器式继电器触点接触不良的方法。

Contactor relays are widely used in the electrical system.Poor-contacting of contactor relays that frequently happens leads to unreliable operation of electrical system.The failure reason of poor-contacting is analyzed in this paper.Two different form contacts of Ag-Cu and Ag-Ni are tested,The effect of contact form is gained from test result.The surfaces of failure samples are studied through the scanning electron microscope（SEM） and X-ray energy spectroscopy（XES）.Main reasons of failure are found and the measurement to decrease the poor-contacting of the product is suggested.