数字滤波在Rogowski线圈测量冲击电流中的应用  

Application of Digital Filtering Technology to the Measurement of Impulse Current with Rogowski Coil

作　　者：徐霖[1] 傅正财[1] 

机构地区：[1]上海交通大学电气工程系,上海200030

出　　处：《高压电器》2004年第4期262-263,266,共3页High Voltage Apparatus

摘　　要：采用自积分式Rogowski线圈测量较小的冲击电流时信号很弱,易受干扰。以金属构架上雷电感应电流的测量为例,讨论了采用直接FFT阈值法、FIR等纹波低通滤波器法和小波变换法三种不同数字滤波方法消噪的效果,并进行了比较。研究表明,小波消噪方法比较适合于这种情况下测量信号的处理。Rogowski coil can be used for the measurement of impulse current.But it is liable to be disturbed if the current to be measured is low.This paper discusses how to improve the performance of the self-integrated Rogowski coil with signal digital filtering technology for such measurement.Three digital filtering methods—— — direct FFT threshold method,FIR equiripple filter and wavelet transform method are applied in de-noising of the output of the Rogowski coil.Comparisons of their de-noise performances show that the wavelet transform method is the most effective.

关 键 词：冲击电流测量 ROGOWSKI线圈 FFT阈值法 FIR滤波器 小波变换 

分 类 号：TM835[电气工程—高电压与绝缘技术]