The electronic equipment is widely applied to aircraft electric power system, so power quality problems in AC main power supply system cause more and more attention.

在飞机电气系统中，随着电力电子装置的广泛应用，交流供电系统的电能质量问题受到越来越多的关注。

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This paper discusses collectivity project for design of parallel welding equipment, and introduces machine's frame, power supply, mechanical system, electric control system and their mutual interface.

论述了平行缝焊设备的研制及总体设计方案，介绍了机体、电源系统、机械系统、控制系统及其相互配合。

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This text introduces category and reason of electrical breakdown, deals with the methods of checking up the power supply, electric circuit and equipment and gives out some concrete countermeasures.

介绍了电气故障的种类、产生的原因，详述了电源、电路、设备和元件故障的查找方法，对常用电气设备的故障原因、查找方法，做了具体的叙述。

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