
The Rogowski coil is a hollow ring-shaped coil arranged around a conductor. Its operating principle is based on Faraday’s law of electromagnetic induction: the alternating magnetic field generated by current induces a voltage in the coil that is proportional to the rate of change of current (di/dt).
Therefore, traditional Rogowski coils cannot measure static direct current.
However, they can measure the rapidly changing portion of pulsed DC signals, significant DC offsets, or the AC components of DC signals.






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