Rogowski Coil MFC190 is a flexible current sensor based on Rogowski principle. MFC150UL coils are available in different sizes and can be supplied according to customer’s design, therefore they can be used in all those applications, in which traditional transformers are not fitting due to size and/or weight. MFC190 coil is provided with a shield against the influence of external magnetic fields, therefore it grants a stable measurement from low currents to several kA. The Rogowski coils must be connected to an electronic integrator for 90° phase shift compensation and frequency equalization. The particular features of the Rogowski coils combined with the extremely flexible input programming of portable meters, allow to carry out measurement by all applications.
Rogowski CoilMFC190 (12mm)
Measurement
Rogowski coil
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Functions
It is based on a simple principle: an “air-cored” coil is placed around the conductor in a toroidal fashion; 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. The output voltage is proportional to the change in current, and after an operational amplifier integrator, is proportional to the value of the current itself.
Key strengths
- Due to its structure, flexible Rogowski coils allows to embrace conductors or grouped cables, which are large and difficult to reach, without any hazard.
- The coil output gives a low voltage signal, therefore there is no danger from open-circuited secondary. This makes Rogowski transducers extremely suitable for temporary measurements, for example in combination with portable analysers.
- Unlike traditional current transformer with magnetic core, the Rogowski coil is a non-intrusive transducer. Since it has no hard core, it draws no power from the main circuit carrying the current to be measured.
- The absence of magnetic core grants a wide frequency response. This make MFC190 particularly suitable for measurement of harmonic content and transients.