The key to power distribution system is to ignore transient process in this sub-system and to draw the network equivalent circuit diagram, therefore its node voltage equation is algebraic equation.

配电子系统的建模关键是忽略其内部的暂态过程并作出了网络的等值电路图，因而依此建立的节点电压方程为代数方程。

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Because the capacitor voltage always changes in the course of charging, and the equivalent load also changes in a large range, the load characters of charging circuit are required strictly.

由于电容在充电过程中，其电压不断改变，其等效负载也在较大的范围内变化，因而对充电电路的负载特性提出了较高要求。

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This article analysed the reason of dangerous voltage merging into from the connection way of ground connection system and equivalent circuit aspects, and put forward a solution.

从接地系统的连接方式和等效电路两个方面分析了危险电压串入的原因，并提出了解决办法。

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