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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Since there is no unified standard for DC current through the neutral point of transformer in China, it is necessary to define and enforce a unified one as soon as possible.

鉴于目前国内对于变压器中性点直流电流还没有一个统一的标准，有必要尽快加以制订和实施。

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The study results reveal shown that the ground fault current will increase with the number of main transformer with neutral to be solidly grounded.

研究结果显示，主变压器的中性点接地与否及电缆遮蔽导体与互連导体对整体的接地系统故障特性有关键性的影响。

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