小电流接地系统--小电流接地系统：中性点不接地或经过消弧线圈和高阻抗接地的三相系统，又称中性点间接接地系统。当某一相发生接地故障时，由于不能构成短路回路，接地故障电流往往比负荷电流小得多，所以这种系统被称为"小电流接地系统"。
该方法适用于小接地电流系统的各种中性点运行方式，并且现场安装简单、不需要定值整定。
This method is suited for various distribution system with different neutral grounding modes. Moreover, it can be easily used in site without adjusting protective setting.
如果在两个接地点存在一个小的电势差，在系统的敏感部分就会有接地电流通过。
If a small potential difference exists between two ground points, some ground currents may flow through a sensitive part of the system.
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