Rogowski Coils for High-Current Measurement

Rogowski coils are used to measure alternating current (AC) and high-speed current pulses. However, the technology has undergone further improvements and modifications in the Rogowski coil (RC) design, and to this day, it is still being researched for new applications. Compared with high-frequency current transformers (HFCT), Rogowski coils have several advantages. This paper briefly reviews the basic theory and applications of Rogowski coils as current measurement sensors. Furthermore, it focuses on the capabilities of Rogowski coils in measuring large currents and their applications in fault detection, overcurrent sensors, lightning current sensors, and high-pulse current detection. Experimental setups, techniques, and measurement parameters in the models are also discussed. Finally, the paper briefly reviews the sensitivity and maximum current detection performance of Rogowski coil current sensors, providing guidance for the future development of advanced RC large current sensors. This review indicates that RCs have very good sensitivity in large current sensor detection, with sensitivity reaching a few nanoseconds, higher bandwidth, excellent high fault detection capability, and the ability to measure lightning currents up to 400 kA, offering many advantages compared with traditional current transformers (CTs).

Rogowski Coil in Large Current Testing Applications