邻近三相电抗器的电缆线路接地线电流计算  

Calculation for Current of Grounding Wire of Cable Adjacent to Three-phase Reactors

作　　者：陈思哲 董晓虎 时伟君 刘志鹏 程绳 肖晓 张宇娇 CHEN Sizhe;DONG Xiaohu;SHI Weijun;LIU Zhipeng;CHENG Sheng;XIAO Xiao;ZHANG Yujiao(State Grid Hubei Electric Power Company Maintenance Company,Wuhan 430050,China;Yueyang Power Supply Company,State Grid Hunan Electric Power Company Limited,Hunan Yueyang 414000,China;School of Electrical and Automation Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]国网湖北省电力有限公司检修公司,武汉430050 [2]国网湖南省电力有限公司岳阳供电分公司,湖南岳阳414000 [3]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《高压电器》2024年第11期94-100,共7页High Voltage Apparatus

基　　金：国家自然科学基金资助项目(52077048)。

摘　　要：某500 kV变电站内电缆线路距邻近单台电抗器铺设距离满足国网五通要求,然而近年来此电缆线路两端的铠装层接地线电流值出现异常增大并引起异常发热。文中针对此问题建立了电缆线路铠装层及邻近三相电抗器电磁场模型,采用有限元数值计算方法,进行了基于场—路耦合的三相电抗器漏磁场对电缆线路接地线电流异常的分析。接地线电流计算结果与实测结果接近,验证了仿真模型及方法的正确性,并在此基础上,讨论了电抗器相数、电缆铺设距离和电缆埋地深度对电缆铠装层接地线电流的影响,为变电站内三相电抗器周围电缆的铺设提供理论指导。The laying distance of cable of one 500 kV substation to the adjacent single set of reactor meets five-pass requirement of State Grid Corporation of China(SGCC).However,in recent years,the current of the armor layer grounding wire on both ends of cable has increased abnormally and caused abnormal heat.In view of this problem,the electromagnetic field model of cable armor layer and adjacent three-phase reactor is set up,the finite element numerical calculation method is used to analyze the influence of leakage magnetic field of three-phase reactor on abnormal current of the grounding wire of cable based on the field-circuit coupling.The the calculation result of the current of the grounding wire is close to the actually measured result,which verifies the correctness of the simulation model and method and,on this basis,the influence of phase number of reactor,the laying distance and burial depth of the cable on current of the grounding wire of armor layer of cable,providing theoretical guidance for the laying of cable around three-phase reactors in substations.

关 键 词：三相电抗器 电缆线路接地线 场—路耦合 

分 类 号：TM47[电气工程—电器] TM862