铁氧体磁环对场线耦合感应电流的抑制效果  

Suppressing Effect of Ferrite Magnetic Rings on Induced Current of Field-to-line Coupling

作　　者：邱日强 朱峰[1] 高晨轩[1] QIU Riqiang;ZHU Feng;GAO Chenxuan(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学电气工程学院

出　　处：《高电压技术》2018年第8期2732-2737,共6页High Voltage Engineering

基　　金：国家自然科学基金(U1434203)~~

摘　　要：为了从理论上研究铁氧体磁环对场线耦合感应电流的抑制效果。基于传输线理论和铁氧体磁环的材料特性,在频域内建立了同轴屏蔽电缆加载铁氧体磁环-大地回路的有源传输线模型,利用该模型可以方便地得到屏蔽电缆终端接不同负载时屏蔽层上的感应电流,分析了铁氧体磁环对屏蔽层上感应电流的抑制机理,并讨论了抑制效果与铁氧体磁环材料特性的关系。研究结果表明：电缆屏蔽层两端接不同负载时,磁环对感应电流都有抑制效果;当磁环内外半径差相同时,内半径越小,抑制效果就越好;当内半径相同时,外半径越大,抑制效果就越好;当磁环形状相同时,磁环磁导率越大,抑制效果就越好。实测结果表明所提出的分析模型是正确的。研究结果可为磁环的选型提供理论依据,节省实验费用。In order to do theoretically research suppressing induced current of field-to-line coupling by ferrite magnetic rings, by the transmission line theory as well as material characteristics of ferrite magnetic rings, we established a transmission line model with a distributed source of coaxial shielded cable with magnetic rings-ground circuit in frequency domain, thus the induced sheath current can be acquired conveniently for different terminal loads of cable. Additionally, we analyzed the mechanism of suppressing induced sheath current by ferrite magnetic rings,.and discussed the relationship between suppression effect and material characteristics. The results show that the ferrite magnetic rings can be utilized to effectively suppress induced current for different terminal loads of cable; when the difference between inner and outer radius of a magnetic ring is same, the smaller the inner radius, the better the suppressing effect; when the inner radius is the same, the larger the outer radius, the better the suppressing effect; when the shape of a magnetic ring is the same, the larger the permeability, the better the suppressing effect. Measured results demonstrate that the proposed model is correct. The research results can provide a theoretical basis for type selection of magnetic rings and save experimental expenditures.

关 键 词：铁氧体磁环 场线耦合 感应电流 电缆 传输线理论 材料特性 

分 类 号：TM277[一般工业技术—材料科学与工程]