共用接地极运行对周围变压器偏磁影响研究

Study on the Impact of DC Bias Magnetic of the Power Transformers by Common Grounding Electrode Under Operation Condition

本文以±800 kV乌东德直流工程昆北换流站和±500 kV云贵互联工程禄劝换流站的共用接地极与周边的±800 kV云广直流工程楚雄换流站接地极同时运行为例,建立仿真模型进行直流偏磁影响研究。同时,结合变压器直流偏磁的耐受电流值以及直流偏磁评估标准,提出相应的变压器直流偏磁治理方案。

This paper studies the influence of DC bias on transformer and substation grounding grid around the common grounding electrode of±800 kV Wudongde DC project Kunbei converter station and±500 kV Yungui interconnection project Luquan converter station,and the grounding electrode of the±800 kV Yunguang DC project Chuxiong converter station is running.the DC bias current distribution of transformer in the surrounding AC power grid is analyzed,and establish the corresponding simulation model.At the same time,combined with the withstand current limit of transformer DC bias and the evaluation standard of DC bias,the corresponding DC bias control scheme are proposed.