Design and application of low ratio high accuracy split-core, core-balance current transformer

The paper describes the design and application of a split-core CT of large dimensions, specifically designed for mounting in 13.8 kV switchgear cubical on the phase bus bars. Though split-core CTpsilas of high current ratio are available, the authors believe that the core-balance CT described in this paper is unique, as no similar CT was readily available in the US/European market. Thus, there is no equivalent installation in the industry of the specifications described in the paper. The CT discussed in this paper was specifically designed to meet the requirements of dimensions and accuracy for sensitive ground fault and directional ground fault relaying.