电缆芯数及敷设方式对电磁场特性的影响分析  

Research on the Cable Electromagnetic Characteristic for Different Core Number and Layout Mode

作　　者：季斌 赵佳康 张科乾 郑毅 JI Bin;ZHAO Jiakang;ZHANG Keqian;ZHENG Yi(NR Electric Power Electronics Co.,Ltd.,Changzhou 213025,China)

机构地区：[1]常州博瑞电力自动化设备有限公司,江苏常州213025

出　　处：《通信电源技术》2023年第11期121-124,共4页Telecom Power Technology

摘　　要：高压电缆因为可靠性高和占据空间小等优势广泛应用于输配电系统。随着电缆载流量的增加,其对周围空间电磁场的影响不容忽视。为合理指导电缆选型及敷设,降低电缆对周围环境及敏感元件的电磁干扰,对单芯电缆及三芯电缆在不同敷设方式下的电磁场特性进行对比分析。以额定电压为20 kV、单根载流量为800 A的动力电缆为例进行研究,根据电缆实际物理参数及布置方式建立仿真模型,电缆周围电磁场域为无界域,通过添加人工边界,将计算域转化为有限场域,采用有限元法计算电缆周围工频电磁场分布情况,并对不同工况下的电缆电磁场计算结果进行对比分析。结果表明,电缆额定电压及载流量一定时,电缆芯数及布置方式对其周围磁场分布影响较大,对电场分布的影响相对较小。High voltage cables are widely used in power transmission and distribution systems due to their high reliability and small footprint.As the current carrying capacity of the cable increases,its impact on the electromagnetic field in the surrounding space cannot be ignored.In order to provide reasonable guidance for cable selection and laying,and reduce the electromagnetic interference of cables to the surrounding environment and sensitive components,a comparative analysis was conducted on the electromagnetic field characteristics of single core cables and three core cables under different laying methods.Taking a power cable with a rated voltage of 20 kV and a single current carrying capacity of 800 A as an example,a simulation model is established based on the actual physical parameters and layout of the cable.The electromagnetic field around the cable is an unbounded domain.By adding artificial boundaries,the calculation domain is transformed into a finite field domain.The finite element method is used to calculate the distribution of power frequency electromagnetic fields around the cable,and the calculation results of the cable electromagnetic field under different working conditions are compared and analyzed.The results indicate that when the rated voltage and current carrying capacity of the cable are constant,the number of cable cores and arrangement method have a significant impact on the surrounding magnetic field distribution,while the impact on the electric field distribution is relatively small.

关 键 词：电缆芯数 敷设方式 电磁场特性 对比分析 

分 类 号：TM75[电气工程—电力系统及自动化]