Rogowski coils have been used for a long time for monitoring or measurements of high, impulse, and transient currents. Rogowski coils are used for monitoring and control, protective relaying, power distribution switches, electric arc furnaces, electromagnetic launchers, core testing of large rotating electrical machines, partial-discharge measurements in high-voltage cables, power electronics, resistance welding in the automotive industry, and plasma physics. Since their nonmagnetic cores do not saturate, they can operate over wide current ranges with inherent linearity. The applications entail low and high accuracy coils, measuring currents from a few amperes to tens of MA, at frequencies from a fraction of hertz to hundreds of MHz. The increased interest in Rogowski coils over the last decades has led to significant improvements in their design and performance. Their development has included innovative designs, new materials, machining techniques, and printed circuit board structures. This presentation will cover the principles of operation, design, calibration, standards, and applications of Rogowski coils.
