熊显名+朱文博+杨志伟
摘 要: 传统的开关电器触头电寿命试验设备一般无法对失效原因进行全面、精确的记录,无法进行试验数据的存储和回访。为此,研制一种结合LabVIEW软件和数据采集卡等硬件的试验系统,该系统以实现电磁继电器和接触器的电寿命检测试验,同时在系统软件的控制下,自动对试验过程中失效情况进行判断和记录。该系统测量的电压、电流数据精度约为0.5%,与传统的设备相比,它能更加准确和直观地反映出试品电寿命的相关指标,为触头设计人员提供可靠的判断依据。
关键词: LabVIEW; 数据采集卡; 电磁继電器; 交流接触器; 触头电寿命; 开关电器
中图分类号: TN916.424?34; TM581 文献标识码: A 文章编号: 1004?373X(2018)06?0133?04
Abstract: The traditional contact electrical endurance test equipment for switching devices generally cannot make comprehensive and accurate record of contact failure causes to carry out the test data storage and a return visit. Therefore, a test system combining with LabVIEW software, data acquisition card and other hardware is developed in this paper. In the system, the electrical endurance detection test for electromagnetic relay and contactor is achieved. The failure conditions in the test process are automatically judged and recorded under the control of system software. The voltage and current data precision measured by the system is about 0.5%. In comparison with the traditional equipment, the system can reflect the relevant indicators of test objects′ electrical endurance more accurately and intuitively, and provide reliable judgment basis for contact design personnel.
Keywords: LabVIEW; data acquisition card; electromagnetic relay; AC contactor; contact electrical endurance; switching device
0 引 言
继电器和接触器都是用于远距离频繁地接通或分段电路的低压电器,其主要控制对象是电动机或其他电力负载[1?2]。为了保证电路可靠的接通和分断,采用使用寿命进行衡量。通常情况下,使用寿命可分为机械寿命和电寿命,机械寿命是指继电器和接触器所承受机械磨损的能力,用不通电的情况下的操作次数表示,电寿命是指在额定条件下带电操作的极限次数[3?4]。一般继电器和接触器的机械寿命基本都可以达到百万次甚至一千万次以上,但是电寿命按照不同的使用类别和不同的机械寿命级别,通常为机械寿命[5]的5%~20%。所以电寿命才是真正决定它们的使用寿命。
在继电器和接触器电寿命的试验中,一般都是测量试验触头两端的电压、主电路电流等瞬态信号的波形,通过这些波形及数据得出结论[6?7]。……