罗氏线圈的频率特性分析与传感器的设计方法

研究了Rogowski线圈电流传感器传感头的频率特性,在分析已有传感头信号处理方法的基础上,总结出利用终端电阻值来调整线圈的阻尼率,从而将传感头的频率响应分作三个特征区域,后继信号处理电路的设计针对各频段特性分别进行处理;文中给出了一种新型结构的自积分与外积分复合式罗氏线圈积分器的设计过程和参数选取方法,在保证传感器具有合适灵敏度的前提下,将传感器的工作频带拓宽到线圈的自然谐振频率.仿真与实验验证了这种新型的罗氏线圈传感器可工作在从工频到高频的大带宽测量范围.

Frequency Response Analysis of a Rogowski Coil Transducer and Its Design Method

In this paper, high frequency behavior for a Rogowski coil is analyzed. Considering the model of the coil frequency response, a design method for the transducer is presented that the damping ratio based on termination resistor divides the frequency band of the coil into three bands: derivation band, proportion band and resonance band. Corresponding outside integrator circuits are built according with every band characteristic. A novel compound integration circuit is described in this paper which is consisted of self-integration, passive RC integration and active RC integration. This compound integrator improvements the measurement upper bandwidth limit of transducer around coil natural frequency. A coil of 100 turns is constructed using compound integrator which is designed under 24Hz-2.8MHz and sensitivity of 1mV/A. Simulation and experimental waveforms verify the transducer operates with both 50Hz grid current and 750A/μs pulse current measurement.