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Electrical Current Measurements Rogowski Coils
Rogowski coils have been used for the detection and measurement of AC current for decades. The coil is based on a simple principle: an "air core" coil is placed around the conductor in a toroidal fashion and the magnetic field produced by the current induces a voltage in the coil. The voltage output is proportional to the rate of change of current. This voltage is integrated, thus producing an output proportional to the current.
By using precision winding techniques especially developed for this purpose, the coils are manufactured so that their output is not influenced by the position of the conductor within the toroid. Rogowski coils also reject interference from external magnetic fields that can be induced by nearby conductors. A Rogowski coil current measuring system consists of a combination coil and signal conditioning electronics.
The Rogowski coil transducer does not measure DC but unlike a current transformer it can carry out accurate measurements of AC components even if there is a large superimposed DC component in the waveform. Rogowski coils are usually connected to an electronic integrator for 90º phase shift compensation and frequency equalization.
High linearity, wide dynamic range. Very easy to install over thick wire bundles or in places with limited access. Cannot be damaged by large overloads.
Typical Applications
Measuring devices, lab instrumentation. Power monitoring and control sytems. DC ripple measurement. High pulse current applications.
Input Range
Std.Outputs
Accuracy
0-250kAac when used with the appropriate RPS50 signal conditioner.
See spec sheet for individual model numbers, lengths and complete product specifications
3Vrms standard
Optional outputs available include:
0-20mA, 4-20mA, 01V and 0-10V
System accuracy when coil is combined with signal conditioner is typically < 2%.
