飞机电缆短路故障分析及机理研究

摘要:

电缆用于连接机上各用电设备，是飞机传递动力电源的重要装置。由于飞机结构和负载的限制，对机上电缆 的体积、重量、性能和规格有严格的要求。无论飞机处于地面维护还是空中飞行状态，电缆异常都可能造成系统短路、 断路故障，严重影响用电设备运行，甚至可能危及飞行员以及飞机的安全。重点分析了绝缘层、热效应、接触电阻、过 载及负载短路对电缆短路特性的影响，进一步通过暂态分析与 Matlab 仿真结果验证提出理论分析的正确性与有效 性，为预测非显性的故障隐患、电缆故障精确定位、电缆环境优化等提供有力支撑。

Abstract:

The aircraft cable is used in the power system to connect different electrical equipment． Due to the structural limitations of electrical equipment，the volume，weight and performance of aircraft cable are required to be improved． Moreover， when the cable faults occur in aircraft power system，the short － circuit fault or breaking fault of cable will affect the operation of electrical equipment，even the safety of aircraft and pilots． The influences of insulation layer，thermal effect，contact resistance，load and overload short － circuit on the short － circuit characteristics of aircraft cable are analyzed． In addition，the results of transient analysis and Matlab simulation are provided to verify the effectiveness of the proposed theoretical analysis， which provides strong support for fault location and environment optimization of cable．