Eccentricity Analysis of Rogowski Coil

Abstract

The Rogowski Coil (RC) has air as core around which coil is wound. It works on the principle of Faradays and Amperes law. RC can be used to measure both high speed impulse and alternating currents. RC offers some very important properties like wide bandwidth, galvanic isolation, linearity, lightness and cheap. Presence of all these properties makes RC better than conventional current transducers. It also offers many other applications viz., energy management, protection systems, CT calibra- tion, current sharing, resistance, welding process, measurement of partial discharges and earth resistance of transmission towers. It can measure currents ranging from mili-amperes (mA) to mega-amperes (MA) without any saturation. The construction and measurement conditions decide the application of RC. The eccentricity of coil is the main parameter considered for modelling of RC. The eccentricity effect becomes prominent when the conductor gets displaced away from the centre due to the deviation from circular shape. Change in conductor position affects the measurements done, so this analysis ensures the accuracy of RC. In this project, eccentricity analysis of RC is done using ANSYS software tool. The ob- served deviation of mutual inductance during the analysis can be justified with the theoretical existing data.