What is the dimension of the round copper wire made use of in the windings of current transformer?

The dimension of the round copper wire used in the windings of a current transformer (CT) depends on multiple factors, including the CT’s current rating, its application, and the specific design requirements set by the manufacturer. Generally, factors such as the maximum carrying current, the electrical resistance, and the thermal performance of the wire must be considered to prevent excessive heat buildup and ensure efficient operation.

There isn’t a single standard dimension because the thickness of the wire (usually specified in terms of its diameter in millimeters or gauges) varies based on the transformer’s design requirements. For example, a transformer needed for a high-current application would require a thicker wire compared to a transformer designed for low-current measurements. The wire gauge could range from very fine wires (e.g., 30 AWG) for precision low-current transformers to much thicker wires (e.g., 10 AWG or larger) for high-current applications.

To accurately determine the appropriate wire size for a current transformer’s windings, calculations based on the specific requirements of the application, including the anticipated primary and secondary currents, the desired turns ratio, and the permissible temperature rise, are essential. Moreover, standards such as those from the Institute of Electrical and Electronics Engineers (IEEE) or the International Electrotechnical Commission (IEC) might provide guidelines or formulas to help in selecting the correct wire dimensions for specific types of current transformers.