高压电缆金属护套接地环流平衡抑制方法分析  

Analysis of Suppression Method for Grounding Circular Current in Metal Sheath of High-voltage Cable

作　　者：王荣亮[1] 王浩鸣[2] 宗红宝 刘勇 孙京生[4] WANG Rongliang;WANG Haoming;ZONG Hongbao;LIU Yong;SUN Jingsheng(Power Cable Company,State Grid Tianjin Electric Power Company,Tianjin 300300,China;Electric Power Research Institute,State Grid Tianjin Electric Power Company,Tianjin 300384,China;School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;State Grid Tianjin Electric Power Company,Tianjin 300010,China)

机构地区：[1]国网天津市电力公司电缆分公司,天津300300 [2]国网天津市电力公司电力科学研究院,天津300384 [3]天津大学电气自动化与信息工程学院,天津300072 [4]国网天津市电力公司,天津300010

出　　处：《电力系统及其自动化学报》2019年第11期108-114,共7页Proceedings of the CSU-EPSA

基　　金：国家电网公司科技资助项目(SGTJDK00PJJS1800007)

摘　　要：高压电缆金属护套接地环流增大导致金属护套损耗增加,进而降低电缆传输效率,影响电缆使用寿命。为了抑制金属护套接地环流,建立了高压电缆交叉互联接地方式下金属护套接地环流计算模型,提出并分析了金属护套串联电阻、串联电感、终端串入补偿电感和终端串联接地电阻下接地环流的计算模型及平衡抑制效果。结果表明所提方法对金属护套接地环流均能起到一定的平衡抑制效果,并且优化组合后的方法能够有效抑制接地环流的增大。The excessive grounding circular current in the metal sheath of high-voltage cable will increase the loss of metal sheath,thus reducing the cable’s transmission efficiency and affecting its service life.To suppress the grounding circular current in metal sheath,a calculation model of grounding circular current in metal sheath is established when the high-voltage cable is operating in cross-connected mode.Furthermore,the calculation model of grounding circular current with the series resistance of metal sheath,series inductance,series compensation inductance at the terminal and series grounding resistance at the terminal is proposed,and the corresponding suppression effects are analyzed.The calculation results prove that the proposed method can balance and suppress the grounding circular current in metal sheath to a certain extent,and the combined optimization method can effectively suppress the growth of grounding circu?lar current.

关 键 词：高压电缆 金属护套损耗 接地环流 环流平衡 抑制方法 

分 类 号：TM615[电气工程—电力系统及自动化]