高压直流继电器电寿命试验及触头模拟试验装置改进研究

发布时间：2018-07-09 13:36

本文选题：高压 + 直流继电器　；参考：《华中科技大学》2014年硕士论文

【摘要】：高压直流继电器在航天领域应用非常广泛，其工作可靠性至关重要。鉴于涉及国防领域关键技术，保密性较强，目前国内外关于高压直流继电器的结构分析和试验研究还很缺乏，在模拟试验方面还没有能够实现多通道实时同步采集和存储的触头模拟试验装置，因此研究提高高压直流继电器电寿命的关键因素，并设计和改进触头模拟试验系统具有重要意义。为了研究高压直流继电器关键参数，通过解剖GX11、HFE18、AEV18012、AEB310012、LEV200、G18/G50等高压直流继电器，结合相关产品技术说明书，从额定切换条件、触头结构、触头材料、驱弧磁场、气压气氛、触头直径的角度对继电器样品的结构和设计原理进行参数对比和理论分析，得到影响高压直流继电器电寿命的关键参数。利用G50和GXX继电器开展电寿命试验，分析结果可知：RC并联电路可有效吸收触头分断瞬间电弧能量、减小电路尖峰电压，从而减小电弧对触头的侵蚀，延长继电器触头电寿命；驱弧磁场有利于电弧的快速运动、减小电弧集聚、拉长电弧，从而加速电弧熄灭、减小电弧对触头的侵蚀，有利于继电器电寿命的提高。在DC5000V/20A和DC5000V/30A带阻性负载条件下，GXX继电器能够完成规定操作次数且不失效。关于触头模拟试验装置，作了如下改进：1）增加了激光位移传感器，以实现对动触头位移、速度的测试功能，，同时通过对原LabVIEW采集程序进行改进，实现利用触头模拟装置实时采集并存储电压、电流、动触头位移、动触头速度、接触压力等5个参数的功能；2）设计了触头表面测量系统，该系统由触头表面拍摄系统和图像分析系统组成，可全程记录触头通断过程中表面轮廓线的变化，计算动静触头表面最大凸起的高度和表面最短距离，并从单一方向定位最短距离对应点所在平面，对研究触头动熔焊的形成过程有重要意义。
[Abstract]:High voltage DC relay is widely used in spaceflight field, its working reliability is very important. In view of the fact that the key technologies in the field of national defense are involved and the confidentiality is strong, there is still a lack of structural analysis and experimental research on HVDC relays at home and abroad. In the aspect of simulation test, there is no contact simulation test device that can realize multi-channel real-time synchronous acquisition and storage, so the key factors to improve the electrical life of HVDC relay are studied. It is of great significance to design and improve the contact simulation test system. In order to study the key parameters of HVDC relay, by dissecting HV DC relay, such as GX11 / HFE18E18AEV18012 / AEB310012 / LEV200 / G50, combined with the technical specification of relevant products, switching condition from rating, contact structure, contact material, arc drive magnetic field, air pressure atmosphere, etc., According to the angle of contact diameter, the parameters of relay sample structure and design principle are compared and analyzed theoretically, and the key parameters affecting the electrical life of HVDC relay are obtained. By using G50 and GXX relays to carry out electrical life tests, the analysis results show that the parallel circuit of 1: RC can effectively absorb the arc energy at the moment of breaking the contact, reduce the peak voltage of the circuit, reduce the erosion of the contact by the arc, and prolong the electrical life of the relay. The magnetic field of arc flooding is beneficial to the rapid movement of arc, reducing the concentration of arc and prolonging the arc, thus accelerating the extinction of arc, reducing the erosion of contact by arc, and increasing the electric life of relay. Under the condition of DC5000V / 20A and DC5000V / 30A band-resistive load, the GXX relay can complete the specified number of operations without failure. As for the contact simulation test device, the following improvements are made: 1) the laser displacement sensor is added to realize the function of measuring the displacement and velocity of the dynamic contact. At the same time, the original LabVIEW acquisition program is improved. Using the contact analog device to collect and store the voltage, current, displacement, velocity and pressure of the contact in real time, a measuring system for the contact surface is designed. The system is composed of contact surface shooting system and image analysis system. It can record the change of surface contour during the process of contact breaking, and calculate the maximum elevation and the shortest distance of the surface of the static and static contact. It is important to study the forming process of contact dynamic fusion welding by locating the plane of the shortest distance corresponding point from a single direction.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM58;TM503.5

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