抄録
Rogowski coils have been used to measure the pulsed or impulse current without cutting off the circuit. Rogowski coils are usually classified into the differentiating and self-integrating types, which are available in comparatively low and high frequency ranges, respectively.
Here, the resonance characteristics of self-integrating Rogowski coils were experimentally observed, and numerically analyzed. A distributed constant circuit was considered to analyze numerically the Rogowski coil. The numerical analyses gave results which agreed with experimental results. It was confirmed that the resonance phenomena, caused the distortion of the waveforms measured by the self-integrating Rogowski coil, occurred in a range of high frequency. The configuration of Rogowski coil influenced its resonance characteris-tics. The resonance frequency increased with decreasing the number of turns and the cross section of the coil and increasing the distance between the coil and the shield. The cut-off frequency of Rogowski coils in the low frequency range was also verified.
