The Rogowski coil is a device used to measure alternating or high-speed electric currents. Its unique design includes an air core and evenly spaced wire winding. It is used in many industries but faces competition from cheaper and lighter sensors using similar technology.
A Rogowski coil is a simple device used to measure alternating current or high-speed electric currents. Its unique design distinguishes it from other measuring devices both structurally and in terms of performance. These coils are used in many fields and are sought after for the accuracy they provide. Recently, Rogowski coils have received a lot of competition from simpler sensors using similar technology.
The Rogowski coil design is unique due to its air core, unlike previous measuring devices which used an iron core. The air core comes courtesy of a single wire that is wound multiple times until it forms a tight coil, similar to a coiled miniature garden hose. This coil is then formed into a circular shape which is wrapped around the conductor needing to measure its current. The design of this coil is also unique because the wire ends, or terminals, are on the same side, creating a complete loop around the conductor.
The Rogowski coil wire winding is the most important element of the whole device. The wound turns of the coil must be evenly spaced or they will run the risk of picking up magnetic interference. The more interference that enters the ball of the coil, the less accurate its measurements will be.
A Rogowski coil measures alternating electric current by connecting each of the wires to an integrator circuit. The coil takes the output current from the conductor and sends the data to the integrator circuit. The result is a map of current patterns and, if properly calibrated, a measurement of the amount of current.
Rogowski coils are used in many industries to measure currents. Transmission of electrical power and welding, where large currents are frequently used, are two of the most popular uses of the coil. Its ability to accommodate an active conductor, due to its lightweight construction, allows it to be applied to virtually any conductor.
The Rogowski coil has seen a lot of competition in the field of alternating current measurement. Using low-cost printed circuit board technology and electronic sensors, the latest components are able to accurately measure the current in a conductor. These cheaper and lighter measuring devices threatened decades of coil dominance in current measurement.
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