Improved performance Rogowski coils for power system

For power system applications, Rogowski coil output voltage is sent to both relays and measuring equipments. The former requires adequate bandwidth and the latter needs adequate sensitivity. However, one could not arbitrarily increase the winding density to increase the sensitivity since the bandwidth is decreased. In order to settle the conflict between sensitivity and bandwidth, a method is proposed in this paper to improve the performance of the coil by integrating several single-layer coils into a whole. Practical results showing the improvement are presented.