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The Electrical System

机译：电气系统

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Bleed air from the engines is the traditional method of powering aircraft systems. It is still used on the 787 for the engine cowl anti-ice systems and pressurising hydraulic reservoirs. However, the majority of the functions that used bleed air on earlier aircraft - including engine and auxiliary power unit (APU) start, anti-ice protection and the cabin environmental control system - are instead driven by electrical power. The result is that the 787 does not feature the pneumatic components of a bleed air system such as ducts, valves, heat shields, overheat monitoring and duct burst protection systems, a pre-cooler, a pneumatic starter and an APU load compressor. In an article in its in-house magazine, AERO, Boeing says the decision to introduce what it calls a, "no-bleed electrical systems architecture" for the 787 has several benefits, including reduced maintenance costs from not having pneumatic systems, operational efficiencies from reduced maintenance and improved engine efficiency because: "all of the high-speed air produced by the engines goes to thrust".
机译：发动机排出的空气是为飞机系统提供动力的传统方法。它仍在787上用于发动机罩防冰系统和增压液压油箱。但是，在较早的飞机上使用引气的大多数功能-包括发动机和辅助动力装置（APU）启动，防冰保护和机舱环境控制系统-而是由电力驱动。结果是787没有配备引气系统的气动组件，例如管道，阀门，隔热罩，过热监控和管道爆破保护系统，预冷却器，气动启动器和APU负载压缩机。波音公司在其内部杂志《 AERO》中的一篇文章中说，决定引入其称为787的“无排放电气系统架构”的决定有几个好处，包括由于没有气动系统而降低了维护成本，提高了运营效率减少了维护并提高了发动机效率，原因是：“发动机产生的所有高速空气都被推力了”。

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