珠海发电厂2号主变压器中性点保护事故分析及校核

Analysis and check on neutral protection accident of No.2 main transformer in Zhuhai Power Station

以珠海电厂220kV2号主变压器中性点避雷器爆炸的典型事故为例,对变压器中性点保护进行计算校核,指出中性点避雷器爆炸事故的原因:一方面是间隙参数选择不当,造成动作不合理;另一方面是避雷器选型不当。为此,有针对性地提出变压器中性点避雷器和间隙保护的合理参数和整改建议。考虑到此类型事故在电力系统中有一定的代表性,文章中所提出的核算和整改建议有较好的参考价值。

In view of the neutral arrester explosion of 220 kV No.2 main transformer in Zhuhai Power Station,the neutral protection of the transformer is calculated and checked,which shows that the improper gap parameters and arrester type are the causes of the explosion.Proper parameters of the neutral arrester and gap protection of the transformer and suggestions for improvement are proposed as well.