在现代飞机上,通常把航空发动机产生的能源称为机械能源,又称为一次能源,向特种设备提供的能源称为二次能源。二次能源常用的有液压能、气压能和电能等三种。飞机操纵系统常用液压能;机轮刹车机构、弹药传输机构用气压能;仪表、电子、照明、雷达等设备则用电能。电能容易传输、变换和控制,为大部分特种设备采用,于是人们大胆设想将二次能源统一为电能。目前,国外就正在研制一种“全电”飞机。飞机电源系统主要由主电源、辅助电源、应急电源、二次电源和带插座的地面 In modern aircraft, the energy generated by aeroengines is usually called mechanical energy, also known as primary energy, and the energy provided to special equipment is called secondary energy. Secondary energy commonly used hydraulic energy, pressure and energy, and other three. Airplane control system commonly used hydraulic energy; wheel brake mechanism, ammunition transmission mechanism with pressure energy; instrumentation, electronics, lighting, radar and other equipment use electricity. Electricity is easily transported, transformed, and controlled, and used for most specialty equipment, so people dare to conceive of unifying secondary energy into electricity. At present, a “all-electric” aircraft is being developed abroad. Aircraft power system is mainly composed of main power, auxiliary power, emergency power, secondary power and socket with the ground