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The operating principle is that of a Rogowski coil, similar to a current transformer.
More recently, low-cost current sensors based on the principle of a Rogowski coil have been developed.
At high frequencies, the Rogowski coil's inductance will decrease its output.
Due to these disadvantages, Rogowski coils are primarily used when ease-of-installation is a high priority.
Another clip-on design is the Rogowski coil.
The full-scale output of a properly designed Rogowski coil is typically a few hundred millivolts.
A correctly formed Rogowski coil, with equally spaced windings, is largely immune to electromagnetic interference.
Devices used for this include Hall effect sensors, current clamps, current transformers, and Rogowski coils.
Another type (called a Rogowski coil) requires an external integrator in order to provide a voltage output that is proportional to the measured current.
These sensors share the principles of a Rogowski coil, measuring the rate of change of current using a transformer with no magnetic core.
The difference from the traditional Rogowski coil is that the sensor can be manufactured using a planar coil rather than a toroidal coil.
A device similar to the Rogowski coil was described by Arthur Prince Chattock of Bristol University in 1887.
A Rogowski coil, named after Walter Rogowski, is an electrical device for measuring alternating current (AC) or high speed current pulses.
The integrator is lossy, so the Rogowski coil does not have a response down to DC; neither does a conventional current transformer (see Néel effect coils for DC).
Walter Rogowski (May 7, 1881 - March 10, 1947) was a German physicist of polish descent who bridged the gap between theoretical physics and applied technology in numerous areas of electronics; the Rogowski coil was named after him.
Since the voltage that is induced in the coil is proportional to the rate of change (derivative) of current in the straight conductor, the output of the Rogowski coil is usually connected to an electrical (or electronic) integrator circuit to provide an output signal that is proportional to the current.
