Rogowski or non-magnetic sensor
Probes for current measurement in power electronics

The advantages of Rogowski or non-magnetic transducers are: output isolation, wide current measurement range (up to 100 kA), high cut-off frequency of approx. 1.5 MHz, good accuracy (< 5%) and good linearity (< 0.5%). The absence of a ferromagnetic magnetic circuit avoids saturation and introduces no current limit. Rogowski transducers have a current measurement range extending from 10 A to 100 kA, with sensitivities between 0.01 mV × A ^–1 and 100 mV × A^–1, and feature good linearity thanks to their principle, which does not require the presence of ferromagnetic material.

The Rogowski sensor operates according to Faraday's law, as shown in figure 17. The voltage measured across the turns surrounding the conductor to be measured is proportional to the derivative of the flux created by the current flowing...