以LKJ2000型监控电源插件为例，介绍模块化电源的功能，阐述了模块化电源的过压、欠压保护电路的工作原理及各路输出过流保护电路的工作原理。

Taking the power board of type LKJ2000train monitoring and recording device as an example, the paper describes the function of the modular power supply.

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这是插件的某种“电源板”，通过对插件声明扩展，其它插件就可以利用这个插件。

This is a sort of "power strip" for a plug-in that others can take advantage of by declaring an extension to it.

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一般是由于带电拔插系统中接插件，或电路中电源对地之间短路而引起，此时可采用静态电阻测量法。

General is due to the live system connector plug or circuit between the power-to-ground short-circuit caused by, at this point resistance measurement method can be static.

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