1·The reasons and importance of setting underground protective grounding net to coal mine are introduced.
介绍了煤矿井下设置保护接地网的原因及重要性。
2·The continuance of protective grounding circuits of industrial electro mechanical equipment must be tested and satisfy with the national standard.
工业机械电气设备保护接地电路的连续性必须进行测试并满足一定要求。
3·This paper introduces the parameter selection, installation, grounding mode of low-voltage power grid and construction method of residual current operated protective device.
文中详细论述了剩余电流动作保护装置的参数选用，安装要求，低压电网接地方式及安装施工要求等。
4·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.
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。