MFC150 Series flexible current transducers operate based on the Rogowski principle. These coils are available in four standard sizes and can also be supplied according to the customer's design by special order. Due to their design-specific features, Rogowski coils are an extremely flexible solution for current measurement and can be used in a number of cases where a traditional current transducer is not an option.
The MFC150 coil is provided with a shield that negates the influence of external magnetic fields allowing for ideal accuracy from low currents to hundreds of kiloamps.
Rogowski coils have been used for the detection and measurement of electric currents for several decades. They are based on a simple principle: an "air-cored" 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 specially developed for the purpose, the coils are manufactured so that their output is not influenced by the position of the conductor within the toroid.
Rogowski coils can be used similarly to current transformers but for many applications, they have considerable advantages. The transducer does not measure DC, but unlike a current transformer it can carry out accurate measurement of AC components even if there is a large superimposed DC component. This feature is particularly useful for measuring ripple currents in battery charging circuits.
Note: A Rogowski coil current measuring system consists of the combination of a coil and conditioning electronics. Rogowski coils must be connected to an electronic integrator for 90° phase shift compensation and frequency equalization.
Benefits of Rogowski Coils
By design, flexible Rogowski coils allow for installation over various conductor sizes or grouped cables.
The coil output gives a low voltage signal; therefore there is no danger from an open-circuited secondary. This feature makes Rogowski transducers extremely suitable for temporary measurements.
Unlike traditional current transformers with magnetic cores, the Rogowski coil is a non-intrusive transducer. Since it has no magnetic core, it draws no power from the main circuit carrying the current to be measured.
The absence of a magnetic core allows for a wide frequency response up to hundreds of kHz. This makes the MFC150 series particularly suitable for the measurement of harmonic content and transients.
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