内蒙古电力技术2024，Vol.42Issue(6)：64-71,8.DOI:10.19929/j.cnki.nmgdljs.2024.0081
220 kV城市长电缆线路护层环流及抑制措施研究
Study on Sheath Circulating Current and Suppression Measures of 220 kV Urban Long Cable Line
摘要
Abstract
Aiming at the problem that the voltage imbalance of metal sheath of high voltage cables causes the over-limit of sheath circulating current,which affects the safe and stable operation of urban power grids and leads to the alarm shutdown of cable lines,the sheath circulating current due to uneven segmentation,different three-phase axial spacings,and mixed arrangement in the cross-interconnection of 220 kV urban long cable lines is analyzed and calculated,and influence of segmentation degree on the sheathing circulation is evaluated by introducing the uneven segmentation factor,and validated by engineering examples.The results show that the simulation model and calculation results have good accuracy;the size of the sheathing circulation is proportional to the uneven segmentation coefficient of the cable cross-connections for single and double circuits;the use of different axle spacings or mixed arrangements in the same group of cross-connections will lead to an increase in the sheathing circulation under uniform segmentation.It is proposed to utilize different axis spacing to suppress the circulation under uneven segmentation,such as by using larger axis spacing for shorter segments and smaller axis spacing for longer segments to reduce the sheathing circulation.关键词
220 kV电缆/交叉互联/护层环流/不均匀分段/三相轴间距Key words
220 kV cable/cross-bonding/sheath circulating current/uneven segmentation/three-phase axis spacing分类
动力与电气工程引用本文复制引用
李炬添,李志宇,林睿,金作林,张振,陈小月..220 kV城市长电缆线路护层环流及抑制措施研究[J].内蒙古电力技术,2024,42(6):64-71,8.基金项目
中国能源建设集团广东省电力设计研究院有限公司科技标准化项目"近海深水区海上风电电气关键技术研究"(EV05011W) （EV05011W）
