Current transformers are an electrical device that safely and accurately measures electrical current in power systems and circuits. It operates on the principle of electromagnetic induction, reducing high primary currents to proportional, lower secondary currents. CTs provide: Electrical isolation between the primary (high-current) and secondary (low-current) circuits. Making them essential for tasks like metering energy consumption. Protective relaying. Monitoring current in industrial processes. They ensure equipment and personnel safety while delivering precise current measurements, serving as a fundamental tool in electrical engineering and power distribution.