大型变压器中性点绝缘的现场考核

On-site Examination on Neutral-point Insulation of Large Transformer

笔者通过对几例大型变压器中性点绝缘故障实例的分析,说明了现场考核变压器中性点绝缘的必要性。文章还介绍了利用变压器中性点现场交流耐压试验以考核其绝缘的方法,并提出对变压器中性点进行局部放电测量的建议。

Through the analysis of some neutral-point insulation faults of large transformers, the necessity of on-site examination on neutral-point insulation of large transformers is discussed. The method of assessing neutral-point insulation of a large transformer through on-site AC voltage-endurance test is presented. Moreover, partial discharge measurement of neutral point of transformer is suggested.