Controlling Rogowski Sensor Frequency Response Through Integrator Design

Focus:

In a previous article series, the operation of the Rogowski coil was analyzed and equations were derived for designing both the coil and integrator to create a complete Rogowski sensor. The purpose was to allow designers to obtain benefits of Rogowski sensors such as wide current range at a much lower cost than off-the-shelf instrument- grade Rogowski sensors, while only making small sacrifices in sensor accuracy. This article carries the discussion further by explaining how to tailor the frequency bandwidth of the Rogowski sensor to a particular application through adjustment of the integrator design. This part also draws on some of the analysis performed in the recent series on integrators.

What you’ll learn:

• How to adjust the frequency response/bandwidth of a Rogowski sensor design
• How to derive the transfer functions of a Rogowski coil and its integrator

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Author & Publication:

Gregory Mirsky, Design Engineer, Deer Park, Ill., How2Power Today, Oct 15 2025

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