110 kV分级绝缘变压器中性点的过电压保护

分析了变压器中性点过电压产生的原因和系统接地情况，结合110kV变压器分级绝缘中性点的绝缘等级及其耐压水平，对中性点保护目前采用的避雷器加水平棒间隙中性点配置方式进行了探讨，提出低压无电源变压器单独使用避雷器、低压有电源变压器单独使用放电间隙作为中性点过电压保护的建议。

Over-voltage Protection for Neutral Point of 110 kV Staged Insulation Transformer

The causes of over-voltage on transformer's neutral point and the situation of grounding system are analyzed,Combined with the insulation and withstand voltage level of 110 kV staged insulation transformer's neutral point,the way of arrester coordinating air gap is usually used to protect the neutral point. The advice about over-voltage protection for neutral point including using single arrester for the transformer without local power supply in its low voltage system and using single air gap for the transformer with local power supply in its low voltage system is provided.