6. Rogowski or non-magnetic sensor
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...
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Rogowski or non-magnetic sensor
Current transformer
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References
- (1) - - Les capteurs de courant de marque LEM : http://www.lem.com/
- (2) - - Capteur d'induction et de courant de marque Honeywell :
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