Rogowski Coils for current measurement
Invented in 1912, Rogowski coils are air-cored toroidal windings which, when wrapped around a current carrying conductor, produce a voltage proportional to the differential of the current flowing in the conductor.
Having no magnetic core, there are no saturation effects and bandwidth is wide.
Windings are traditionally evenly spaced around the toroid and output voltage is largely independent of distortions in the shape of the toroid. This last feature means flexible wraparound Rogowski coils can be quickly attached to unbroken conductors.
To compensate for inherent differention, an integrator is connected to the coil output.
One major drawback is, a simple Rogowski coil is susceptible to external magnetic interference.
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