This paper introduces the common grounding, expounds the principle of the system grounded, analysis of the electrical and electronic equipment grounding of the special.

该文介绍了常用接地方式，阐述了系统接地的原则，分析了电子电气设备接地的特殊性。

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They provide system security and immediate reliable low level ground fault detection on three-phase AC resistance grounded or grounded electrical distribution systems.

此类继电器能够增加系统安全性，并对三相交流接地电阻或接地配电系统进行可靠的低级接地故障检测。

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Both Mr Obama and Mr Kenny hailed airline Ryanair's announcement on Tuesday that it will buy 175 jets from Chicago-based Boeing Co, which has struggled ever since its new 787 Dreamliner was grounded by regulators in January following problems with its electrical system.

BBC: Peter Robinson and Martin McGuinness meet Barack Obama