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为提高配电系统可用度,现代飞机广泛采用固态二次配电装置SPDA来取代传统的由继电器/断路器组成的配电系统,它避免了机电式控制装置在开通/关断瞬间产生的电弧,同时也提高了系统使用寿命。SPDA的高可用度除了依赖固态功率控制即SSPC技术外,在系统架构的设计上,采用了余度管理技术。其中计算技术采用了硬件的余度设计思想,而输入/输出模块则采用了软件的余度设计。在定量分析了采用余度管理技术对系统可用度的影响后,得出的结论是采用硬件余度的计算技术的可用度从原有的99.999%提高到99.999 999 98%,采用软件余度的输入/输出模块的可用度从99.998%提高到了99.998 999 99%。
In order to improve the availability of power distribution systems, modern aircraft widely use the solid state secondary distribution device SPDA instead of the traditional distribution system composed of relays / circuit breakers, which avoids the arc generated by the electromechanical control device at the moment of on / off , But also improve the system life. In addition to relying on Solid State Power Control (SSPC) technology, the high availability of SPDA uses redundancy management techniques in system architecture design. Among them, the calculation technology adopts the design idea of the hardware redundancy, while the input / output module adopts the software redundancy design. After quantitatively analyzing the influence of redundancy management technology on the availability of the system, it is concluded that the availability of the calculation technology adopting the hardware redundancy increases from 99.999% to 99.99999998%, and the software redundancy The availability of I / O modules increased from 99.998% to 99.998 999 99%.