高压电器2017，Vol.53Issue(8)：153-158,6.DOI:10.13296/j.1001-1609.hva.2017.08.026
南方电网所辖换流变压器直流偏磁数据分析
Analysis of DC Magnetic Bias Data of Converter Transformer in CSG
刘青松 1伍衡 1彭光强 1周海滨 1谭炳源1
作者信息
- 1. 南方电网超高压输电公司检修试验中心,广州 510663
- 折叠
摘要
Abstract
The dense distribution of HVDC projects of CSG is concentrated in the China's Pearl River Delta Region.With the new HVDC projects put into operation,the DC magnetic bias is more prominent caused by the ground return current of grounding electrode.According to the geographical situation of the grounding electrode and the converter station,the principle of the increase of the ground potential is discussed,the mechanism and the damage caused by DC bias magnetic current are analyzed.In order to solve the DC magnetic bias in the operation of the converter station,based on the original transient recording data of the neutral point of the converter transformer,the DC magnetic bias current is calculated.Computational and statistical results show that,with the increase of the ground return current,the DC magnetic bias current of the converter transformer also shows an increasing trend.Thereinto,Congxi Converter Station by the DC magnetic bias current is more serious.When the ground return current of the Yulongling Grounding Electrode rises to 3 558 A,the maximum of the DC bias current of the neutral point of the converter transformer rises to 40 A.Finally,according to the results of statistical data,suggestion for installing a capacitance isolation DC device in transformer neutral point is presented at Congxi Converter Station.The capacitance isolation DC device has been put into operation and achieved good effect of DC isolation.关键词
直流输电/直流偏磁/接地极/入地电流/电容隔直装置Key words
HVDC/DC magnetic bias/earthing electrode/ground return current/capacitance isolation DC device引用本文复制引用
刘青松,伍衡,彭光强,周海滨,谭炳源..南方电网所辖换流变压器直流偏磁数据分析[J].高压电器,2017,53(8):153-158,6.
