一种扇形芯线截面三芯电力电缆表面磁场的等效计算方法  

Equivalent calculation method of surface magnetic field of a three-core power cable with sector cores

作　　者：袁燕岭[1] 李凯特 董杰[1] 高俊福[1] 李世松[2] 赵伟[2] Yuan Yanling;Li Kaite;Dong Jie;Gao Junfu;Li Shisong;Zhao Wei(Tangshan Power Supply Company,Tangshan 063000,China;State Key Laboratory of Control and Simulation of Power System and Generation Equipments,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]国网唐山供电公司,唐山063000 [2]清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室,北京100084

出　　处：《电测与仪表》2018年第B08期32-36,41,共6页Electrical Measurement & Instrumentation

摘　　要：为解决扇形芯线截面三芯电力电缆表面磁场难以计算的问题,文中提出了一种扇形芯线截面三芯电力电缆表面磁场的等效计算方法。依据等效原理,采用两个对称线电流,模拟单相电流在扇形截面芯线中的分布;根据安培环路定理,确定单相电流对扇形芯线截面三芯电力电缆表面磁场的贡献;利用局部坐标和向量合成法,确定了扇形芯线截面三芯电力电缆表面的磁感应强度,建立了扇形芯线截面三芯电力电缆表面磁场与三相电流之间的物理数学模型,给出了用于计算扇形芯线截面三芯电力电缆表面磁场的解析表达式。电磁场有限元仿真试验和等效模型计算的结果表明,所建立的等效模型具有满足需求的准确性,对扇形芯线截面三芯电力电缆表面磁场的计算具有指导价值。In order to solve the problem that it is difficult to calculate the magnetic field on the surface of a three-core power cable with sector cores,this paper presents an equivalent calculation method for the surface magnetic field of a three-core power cable with sector cores.According to the principle of equivalence,two symmetrical line currents are used to simulate the distribution of single-phase current in a sector core.According to the Ampere loop theorem,the contribution of the single-phase current to the magnetic field distribution on the surface of a three-core power cable with sector cores is determined.Using the local coordinates and vector synthesis method,the magnetic flux density of the three-core power cable cross-section of the sector core wire was determined.The physical-mathematical model between the surface magnetic field and the three-phase current of a three-core power cable with sector cores was established.The analytical expression for calculating the magnetic field on the surface of a three-core power cable with sector cores was presented.The results of electromagnetic field finite element simulation and equivalent model calculation show that the established equivalent model has good accuracy and has guiding value for calculating the magnetic field on the surface of the three-core power cable with sector cores.

关 键 词：扇形芯线截面三芯电力电缆 磁场计算 等效模型 电磁场有限元仿真 电流测量 

分 类 号：TM933[电气工程—电力电子与电力传动]