基于PCB平面型Rogowski线圈的电流互感器误差分析及积分器设计  

Error analysis and integrator design for planar Rogowski coil current transformer based on PCB

作　　者：纪哲[1] 黄纯[1] 周有庆[1] 王海浪[1] 卢小芬[1] 刘跃群[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电力自动化设备》2011年第2期76-78,89,共4页Electric Power Automation Equipment

基　　金：实用新型专利(200620052659.2);发明专利(200610032482.4);湖南省科技重大专项(2009Fj1014)~~

摘　　要：为了进一步提高印刷电路板(PCB)平面型Rogowski线圈电流互感器的测量精度,根据PCB线圈的特点建立了线圈的等值电路;推导出线圈二次感应电压和一次被测电流的关系式。从频率和温度两方面分析了线圈的误差特性,指出线圈信号取样电阻(积分器输入电阻)阻值选择是影响线圈频率与温度特性的重要因素,适当增大取样电阻阻值可改善线圈的频率特性,并推导出了消除温度影响的阻值选择公式。分析了小电流测量时准确度不高的原因,在原积分器低频段引入微分环节可减小其低频段的放大倍数,从而抑制低频干扰。仿真与实验验证了改进的有效性。In order to further improve the measurement accuracy of planar Rogowski coil current transformer based on PCB（Printed Circuit Board）,the PCB coil equivalent circuit is set up and the relationship between its induced secondary voltage and measured primary current is derived. Its error characteristics are analyzed in the aspects of power frequency and temperature. It is pointed out that,the resistance of sampling resistor（input resistor of integrator） is an important factor affecting the frequency and temperature characteristics of coil. Appropriate increase of the resistance may improve the frequency characteristics of coil. The formula for selecting the resistance to completely eliminate the temperature error is derived. The low accuracy of small current measurement is analyzed and a differentiator is added to the low frequency band of original integrator to reduce its low frequency band magnification for low frequency interference suppression. Simulation and experiments verify the effectiveness of the design.

关 键 词：电流互感器 平面型Rogowski线圈 印刷电路板 小电流测量 误差分析 积分器 

分 类 号：TM452[电气工程—电器]