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.
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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