NOTE 2 A PEN conductor is a protective earthed neutral conductor combining the functions of both a protective conductor and a neutral conductor.
注2： PEN导线是指将保护导线和中性导线两种功能结合在一起的保护接地中性线。
In the article the author analysises and discusses earthed neutral system. Methods of electric resistance and autotracking arcextinguishing coil in neutral point are discussed.
本文就城网改造中，配电网中性点运行方式问题进行了分析、探讨，强调采用中性点经电阻和自动跟踪补偿消弧线圈接地方式。
The effect of DC earthed pol current on the neutral earthed transformer is analysed. The methods of reducing THD DC current which flows into transformer windings are introduced.
分析了直流接地极电流对中性点接地变压器的影响，介绍了减小流入该变压器绕组直流电流的措施。
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