摘要
针对由于飞机泵站航空接触器工作不稳定引发的飞机发电机断电故障,开展航空交流接触器动作特性的退化现象与机理分析。搭建测试平台,测试接触器动作电压波形,查探触头动作时间及接通状况。将原机故障件和同型号正常接触器进行拆解,用体式显微镜和扫描电镜对比观察2台接触器的动、静触头的宏观和微观形貌,为接触器工作失效分析提供佐证。结果表明:接触器触头同步时间超过2 ms标准要求,接触器泵类负载长期启动产生的浪涌电流是导致接触器耐线路系统过载能力不足的重要原因,在设计中应尽量减弱泵类负载启动浪涌电流对触头电烧蚀的危害。
Aiming at the dangerous fault of aircraft generator power failure caused by unstable operation of aviation contactor in aircraft pump station,the degradation phenomenon and mechanism of action characteristics of aviation alternating current(AC)contactors were analyzed.A test platform was built to test the action voltage waveform of the contactor and check the action time and connection status of the contacts.A faulty contactor and a normal contactor of the same model were disassembled.The macro and micro morphologies of the moving and static contacts of the two contactors were observed with a stereo light microscope and a scanning electron microscope,providing evidence for the analysis of contactor failure.The results show that the synchronous time of the contactor contacts exceeds the standard requirement of 2 ms,and the surge current generated by the long-term startup of the contactor pump load is the important reason for the insufficient overload resistance of the contactor to the line system.The harm of the pump load startup surge current to the electrical ablation of contacts should be minimized in the design.
作者
张元峰
张秋生
于春风
刘治国
ZHANG Yuan-feng;ZHANG Qiu-sheng;YU Chun-feng;LIU Zhi-guo(Naval Aeronautical Engineering Academy Qingdao Branch,Shangdong Qingdao 266041,China;92635 Troops,Shandong Qingdao 266041,China)
出处
《失效分析与预防》
2023年第5期335-340,共6页
Failure Analysis and Prevention
关键词
航空接触器
动作特性
电烧蚀
退化现象
机理分析
aviation contactor
action characteristics
electrical ablation
degeneration
mechanism analysis
