Design And Development Of A High-Performance Current Trasnformer For Switchgear Applications

This paper presents the design and development of a high-performance Current Transformer (CT) tailored for switchgear applications. CTs play a critical role in sensing currents and powering up Electronic trip units (ETU), ensuring effective operation of circuit breakers. Our research focuses on meeting two primary objectives. The first is to power up the trip unit and second is to accurately sense primary currents over a specified range while minimizing metering errors. To achieve these goals, we employed advanced design principles and optimum choice of materials in the construction of the CT. The resulting CT prototype demonstrates exceptional performance in terms of early power up of ETU, rapid saturation, and precise current measurement, making it an ideal choice for modern circuit breakers and other applications in the power industry.