电工技术学报2011，Vol.26Issue(7)：256-263,8.
交直流互联系统直流地表电位简易算式
Study of the Simple Formula of DC Surface Potential in AC-DC Interconnected Large Power System
摘要
Abstract
DC magnetic bias,caused by the current from the DC grounding electrode,threatens the safety of AC grid.At first,a simple and easy-to-use formula for calculating the DC surface potential was presented,which was based on typical three-layer soil structure.Secondly,in the verification, measured value of DC current of transformer neutral point was applied to decide the coefficient of the formula by editing nodal equation.Comparison of the calculated,simulation and measured value demonstrates high accuracy of the formula.Finally,DC current distribution in substations caused by DC grounding electrode was evaluated by predicting DC surface potential and step voltage in a HVDC with the formula mentioned above.Several substations were pointed out to take protective measures.关键词
直流接地极/直流偏磁问题/直流地表电位/简易算式/变压器中性点直流电流/跨步电压Key words
DC grounding electrode/DC magnetic bias/DC surface potential/easy-to-use formula/DC current of transformer neutral point/step voltage分类
信息技术与安全科学引用本文复制引用
任志超,续建国,张一坤,甄威,吴广宁..交直流互联系统直流地表电位简易算式[J].电工技术学报,2011,26(7):256-263,8.基金项目
中加国际科技合作项目 （）
