磁阀式电磁型电流互感器  

Magnetic-valve-type Electromagnetic Current Transformer

作　　者：吴煜文 田翠华[1] 吴凡[1] 陈耀军[1] 陈柏超[1] WU Yuwen;TIAN Cuihua;WU Fan;CHEN Yaojun;CHEN Baichao(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072

出　　处：《高电压技术》2020年第9期3154-3163,共10页High Voltage Engineering

摘　　要：电流传感技术是影响智能电网发展的关键技术之一。传统的P类电流互感器若在运行中饱和可能会引起继电保护装置的不正确动作,极大威胁电网的安全运行,而现有的新型电流传感技术因成本和使用环境等原因限制了其推广应用。为此提出了磁阀式电磁型电流互感器,通过理论计算分析将其工作状态分为线性工作状态、部分饱和工作状态和饱和状态,建立了仿真模型进行其稳态和暂态电流波形的测量特性的分析,并通过仿真和实验予以验证。该电流互感器采用带磁阀结构的铁芯和磁场传感器,提高了抗饱和能力,主要结构与传统的电磁式电流互感器类似,组成部件容易获取,成本低,具有较好的工程实际应用价值。Current sensing technology is one of the key technologies that affect the development of smart grid.If a traditional class-P current transformer is saturated in operation,it may cause the incorrect action of relay protection devices,which will greatly threaten the safe operation of the power grid.However,the existing new current sensing technology has limited its popularization and application due to the cost and usage environment.For this reason,a magnetic-valve-type electromagnetic current transformer is proposed.Its working state is divided into linear working state,partial saturation working state,and saturation state by theoretical calculation and analysis.A simulation model is established to analyze its measurement characteristics of steady and transient current waveforms,which are verified by simulation and experiments.An iron core with magnetic valve structure and magnetic field sensors are adopted in the current transformer so as to improve the anti-saturation ability.The main structure of the current transformer is similar to that of the traditional electromagnetic current transformer.Its components are easy to obtain,and the cost is low,so it has good engineering application value.

关 键 词：电流测量 铁芯饱和 电磁式电流互感器 磁阀 磁场传感器 电流补偿 

分 类 号：TM452[电气工程—电器]