Analysis of DC Magnetic Bias Data of Converter Transformer in CSG

LIU Qingsong; WU Heng; PENG Guangqiang; ZHOU Haibin; TAN Bingyuan

doi:10.13296/j.1001-1609.hva.2017.08.026

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Analysis of DC Magnetic Bias Data of Converter Transformer in CSG

更新时间：2025-04-26

- Analysis of DC Magnetic Bias Data of Converter Transformer in CSG
- High VoltageApparatus Vol. 53, Issue 8, Pages: 153-158(2017)
- 作者机构：
  
  南方电网超高压输电公司检修试验中心
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2017.08.026
  CLC： TM41;TM721.1
- Published：2017
- 稿件说明：
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[1]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(08):153-158.

LIU Qingsong, WU Heng, PENG Guangqiang, et al. Analysis of DC Magnetic Bias Data of Converter Transformer in CSG[J]. High voltageapparatus, 2017, 53(8): 153-158.
[1]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(08):153-158. DOI： 10.13296/j.1001-1609.hva.2017.08.026.

LIU Qingsong, WU Heng, PENG Guangqiang, et al. Analysis of DC Magnetic Bias Data of Converter Transformer in CSG[J]. High voltageapparatus, 2017, 53(8): 153-158. DOI： 10.13296/j.1001-1609.hva.2017.08.026.

摘要

南方电网所辖直流输电工程能源落点多集中在珠三角地区。随着新建直流输电工程陆续投运

接地极入地电流对换流变直流偏磁影响较为突出。针对珠三角地区各接地极与换流站的地理位置现状

探讨了入地电流导致地电位升高原理

分析了直流偏磁产生机理和导致的危害。为掌握和解决运行中换流变遭受的直流偏磁风险

基于换流变网侧中性点暂态录波原始数据

计算了各换流站直流偏磁电流大小。计算和统计结果表明

随着接地极入地电流增大

换流变网侧中性点直流偏磁电流也呈现增大趋势。其中

从西换流站换流变受直流偏磁影响较为严重

在鱼龙岭接地极入地电流为3 558 A时

从西站单台换流变中性点直流偏磁电流最大可达40 A。最后

根据统计数据结果

提出在从西换流站换流变中性点加装电容隔直装置、其他换流站继续加强数据监测工作的建议

该电容隔直装置已投运并取得了良好的隔直效果。

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.

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