新型磁光介质——铁磁流体特性的研究  

Characteristics of the New Magneto-optical Media——Magnetic Fluid

作　　者：杜林[1] 林明晖[1] 王士彬[1] 孙才新[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《高压电器》2009年第3期23-27,共5页High Voltage Apparatus

基　　金：输配变装备及系统安全与新技术国家重点实验室自主项目资助(2007DA10512708302)

摘　　要：分析表明现行几种磁光式光电电流互感器(MOCT)存在的问题均与所采用的磁光介质有关。针对现行磁光介质所存在的问题,笔者对新型磁光介质——铁磁流体的特性进行初步地研究。结果表明:铁磁流体在直流磁场作用下存在线性工作区域;而在工频交流磁场作用时,其响应并非是工频50 Hz信号输出,而是工频的两倍——100 Hz输出。分析表明:与块状玻璃磁光介质相比,铁磁流体所展示的法拉第磁光特性有较大差异。经初步推断,铁磁流体异样的磁光特性应与其在磁场作用下线状链的形成密切相关。The analysis indicates that the problems existing in several conventional magneto-optical current transducers are related to their magneto-optical media. Therefore, the characteristics of the new magneto-optical medium, magnetic fluid, are investigated in this paper. The results indicate that the magnetic fluid has an obvious linear working space under DC magnetic field, but under the power frequency （50 Hz） magnetic field, its response is the output signal with two times of the power frequency （100 Hz） instead of the power frequency output signal. Compared to the massive glass magneto-optical medium, the Faraday magneto-optical properties of the magnetic fluid are quite different. It is inferred that the strange magneto-optical characteristics of the magnetic fluid under magnetic field are closely related to the formation of the linear chain.

关 键 词：磁光式光电电流互感器 水基Fe3O4 磁流体 磁场 法拉第效应 

分 类 号：TM452.93[电气工程—电器]