Characterization Study on an Air-Core Rogowski Coil Based Current Transformer

Advanced current transformer (CT) technologies have been motivated with the development of smart grids. Compared to traditional magnetic-core based CTs, air-core Rogowski Coil (RC) based low power current transformers (LPCTs) feature advantages of being lighter, more portable, and higher measurement accuracy in harmonic frequency range. In this paper, the characterization study of an air-core RC based LPCT is performed by utilizing numerical simulations. In specific, the influence of diverse parameters, for instance, the number of coils turns, harmonic frequency as well as the dimensions of the primary conductor are comprehensively investigated. The accuracy of the numerical model is then accordingly validated by comparing with theoretical computations. This study aims to deepen the understanding of the practical applications of the air-core RC based LPCT and provide insights for its widespread utilization in smart grids.