自积分式Rogowski线圈电参数对其频率特性的影响

Study on influence of electrical parameters on frequency band of self-integrator Rogowski coil

Rogowski线圈具有结构简单、安装方便、检测灵敏度高、频带宽等优点。对于测量高频的脉冲电流的自积分式Rogowski线圈,灵敏度与频带宽度是衡量其性能的重要指标。在简单分析Rogowski测量原理的基础上,利用集中参数模型,给出了自积分式Rogowski线圈参数的计算公式以及线圈的传递函数。根据传递函数,利用Matlab仿真软件得到当电磁参数改变时线圈的幅频特性和相频特性。详细分析了自感、互感、内阻、分布电容以及取样电阻变化时对自积分式Ro-gowski线圈频带宽度的影响,为优化Rogowski线圈的设计提供参考。

Rogowski coil is of simple structure, easy installation, high sensitivity and wide band, and can be adapted to measure high frequency currents such as pulse currents. Rogowski coil can be self-integrating when used at high frequencies, so sensitivity and bandwidth are important performance indicators. The aim of this paper is to explore the possibilities of obtaining better measurements by simply changing the electric parameters. Based on the introduction of the basic measurement theory of Rogowski coil used to measure pulse current, the parameters and the transfer function of the self-integrating are proposed. According to the transfer function, a bode plot simulates the effect of changing some of these variables, and the results are focused on the pursued objective by MATLAB. In the process, the influences of the inductance, mutual inductance, resistance and capacitance on the bode diagram of Rogowski coil are analyzed, which can give some advice to optimize the design of Rogowski coil.