飞机接触器失效分析与预防

Failure Analysis and Prevention of Aircraft Contactor

作为飞机电气控制系统中重要基础元件之一的接触器,要求在预定的时限内有百分百的工作可靠,接触器的可靠性研究已受到国内外普遍关注。针对飞机接触器易发生触头熔焊等失效现象,对典型接触器展开研究,深入分析接触器因长期大负载工作引起触头发生熔焊的机理和失效原因。从产品维护和可修复性的角度,提出基于各接触器的实际状态,结合飞机大修,采取打磨、抛光触头的方法,减小触头接触电阻,抑制触头磨损扩大趋势,突破接触器修理技术瓶颈。采取针对性的修理,提高了接触器工作的可靠性,最大限度地消除了飞机供、配电系统的安全隐患。

As an important component of the electrical controlling systems,contactors should have the reliability of 100%within the scheduled time limit,so their reliability has aroused wide attention at home and abroad.Aiming at the failure phenomenon of contact welding of the contactors in a type of airplanes,some typical contactors were studied.The mechanism and cause of the contact welding after long-term heavy load work were analyzed.From the perspective of the maintenance and reparability,based on the actual state of the contactors,and combined with the overhaul of the aircrafts,it is suggested that the contacts should be ground and polished to reduce the contact resistance of the contacts and suppress the trend of contact wear.This method breaks through the bottleneck of contactor repairing,the reliability of the contactors and electrical controlling systems has been improved.