Small-Diameter Rogowski Coil and Integrator for Wide-Band Current Sensor

Current waveforms can effectively be measured using a Rogowski coil. To accurately measure a current waveform, the wide-band frequency characteristics of a current sensor composed of a Rogowski coil and an integration circuit are required. Wide-band current sensors are usually expensive. Therefore, a low-cost and wide-band sensor with high accuracy is needed. The developed wide-band current sensor using a small-diameter Rogowski coil is connected to an oscilloscope, and the current waveform can be measured. The design and manufacturing methods and the evaluation results of the frequency characteristic are introduced in this paper.