抗直流电流互感器的谐波频率响应机理及分析  

Principle and analysis of harmonic frequency response of anti-DCcurrent transformer

作　　者：刘宇鹏 马建明 裴庆龙 郭超 张能 林显富 LIU Yupeng;MA Jianming;PEI Qinglong;GUO Chao;ZHANG Neng;LIN Xianfu(Inner Mongolia Power(Group)Co.,Ltd.,Hohhot 010020,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;State Grid Electric Power Research Institute Wuhan Nari Co.,Ltd.,Wuhan 430415,China)

机构地区：[1]内蒙古电力(集团)有限责任公司,内蒙古呼和浩特010020 [2]湖南大学电气与信息工程学院,湖南长沙410082 [3]国网电力科学研究院武汉南瑞有限责任公司,湖北武汉430415

出　　处：《中国测试》2024年第4期109-118,133,共11页China Measurement & Test

基　　金：内蒙古电力公司2021年科技计划项目(2021-69)。

摘　　要：近年来为保证电能计量在直流偏置环境下的精确性,抗直流电流互感器得到广泛的关注。虽然抗直流电流互感器能够有效地在较大直流分量环境下保持非磁饱和状态工作,即工作在线性区域,但其谐波电流的传变特性至今仍不清晰。为此,该文建立抗直流电流互感器的等效线性电路进行谐波电流的频率影响特性分析。首先,分别建立基于非气隙式电流互感器和气隙式电流互感器的励磁等效电感模型。其次基于该励磁等效电感,建立抗直流电流互感器的等效阻抗模型。通过该建立的等效阻抗模型,进一步地探索抗直流电流互感器不同关键参数对谐波电流的传变影响,揭示抗直流电流互感器的谐波电流传变特性。最后在Matlab/Simulink中搭建仿真模型验证理论分析。结果分析发现:1)增加互感器的气隙能够极大地扩大互感器的线性工作区域,从而有效地保证互感器在各种恶劣的环境下实现精准的信号测量;2)互感器铁心的平均磁路长度和气隙的变化对谐波电流的传变有很少的影响。但,互感器的励磁通道的等效电阻和电感的大小严重影响谐波频率的传变。In recent years,to ensure the accuracy of electric energy measurement in the DC bias environment,anti-DC current transformers have received extensive attention.Although the anti-DC current transformer can effectively maintain the non-magnetic saturation state in the environment of large DC component,that is,work in the linear region,the transmission characteristics of its harmonic current are still unclear.For this reason,this paper establishes the equivalent linear circuit of anti-DC current transformer to analyze the frequency influence characteristics of harmonic current.First,the excitation equivalent inductance models are established based on non-air-gap current transformers and air-gap current transformers. Secondly, based on the excitationequivalent inductance, the equivalent impedance model of the anti-DC current transformer is established.Through the established equivalent impedance model, the influence of different key parameters of the anti-DCcurrent transformer on the harmonic current transmission is further explored, and the harmonic currenttransmission characteristics of the anti-DC current transformer are revealed. Finally, a simulation model is builtin Matlab/Simulink to verify the theoretical analysis. The analysis results show that 1) increasing thetransformer's air gap can greatly expand the linear working area of the transformer, thus effectively ensuringthe accurate signal measurement of the transformer in various harsh environments. 2) The change of theaverage magnetic circuit length and air gap of the transformer core has little effect on the transmission ofharmonic current. However, the equivalent resistance and inductance of the excitation channel of thetransformer seriously affect the transmission of harmonic frequencies.

关 键 词：抗直流互感器 阻抗模型 线性模型 谐波 频率响应 

分 类 号：TB9[一般工业技术—计量学] TM452[机械工程—测试计量技术及仪器]