重载流多芯电缆周围的磁场Ⅱ.数值计算和测量  

Magnetic Fields around Heavy-Current-Carrying Multi-Core Cables Ⅱ. Numerical and Experimental Evaluation

作　　者：傅正财[1] 杜亚平[2] J.Burnett 

机构地区：[1]上海交通大学电力学院,上海200030 [2]香港理工大学屋宇设备工程学系

出　　处：《上海交通大学学报》2002年第2期243-247,共5页Journal of Shanghai Jiaotong University

摘　　要：重载流无铠装多芯电缆周围磁场的特性可以用载流平行螺旋线理论模型来解释 ,而据此推导的简化计算公式可方便地估算电缆周围的磁场 .为验证该理论模型的有效性和简化公式的准确度 ,对电缆周围的极低频磁场进行了基于毕奥 -沙伐定律的数值计算和实测 .通过数值计算结果和实测值与简化公式估算结果之间的比较 ,证明了该理论模型的有效性 ,发现简化计算公式对距电缆轴线 0 .2 m以外的磁场有很高的估算精度 .另外 ,还讨论了电缆所载电流的特性对周围磁场的影响 ,并提出一些降低多芯电缆系统周围磁场的方法 .A current carrying parallel helix filament model and some simplified formulas were proposed to explain the patterns of the magnetic fields around multi core power cables and to evaluate such fields. The purpose of this paper is to validate the effectiveness of the proposed model and to evaluate the accuracy of these simplified formulas. A numerical program based on the theoretical model and the Biot Savart Law was proposed. Numerical calculations and laboratory measurements of the magnetic fields around some 4 core cables were carried out. The validity of the model is validated through comparisons among the model predicted value, the numerical results, and the measured data. It is found that the simplified formulas are highly accurate in predicting the magnetic fields in the space 0.2 m away from the cable. In addition, the influences of some cable parameters on the magnetic fields were analyzed. The magnetic field impact of unbalanced currents and harmonic currents was also discussed. Magnetic field cancellation can be observed when several multi core cables are installed in parallel.

关 键 词：重载流 数值计算 测量 多芯电力电缆 极低频磁场 电磁兼容 低压配电系统 

分 类 号：TM154.1[电气工程—电工理论与新技术] TM726.2