Mains Frequency Current Transformers

Sirio is a leading manufacturer of electromagnetic components for applications in industrial electronics. Their range of power transformers has been used in high frequency insulated power converters over the last ten years. Manufactured by a special dedicated automatic machine, Sirio’s power transformers are widely used in demanding, high power applications with very high reliability expectations.

Today, Sirio is one of the world’s leading manufacturers of power transformers, specialising in the development and production of current transformers, with more than a quarter of a million power transformers in the field.

Download Sirio’s High Frequency Power Transformers and Inductors Brochure

Main Frequency Current Transformers

Main frequency current transformers are used to measure alternate currents at 50-60 Hz, up to 600 Arms.

Examples:

They are based on toroidal Silicon Iron core; they typically have a high number of secondary turns, so that the secondary current is relatively low. By connecting a burden resistance to the secondary side, you can read a proportional voltage signal, isolated from the mains. As the secondary current is low, the low power burden resistance can be connected to the PCB.

Current transformers are used to measure and detect alternate currents by keeping the galvanic isolation between the primary cable (the network) and the control stage. They typically have a high number of secondary turns, so that the secondary current is relatively low. By connecting a burden resistance to the secondary side, a proportional voltage signal, isolated from the mains can be read. As the secondary current is low, the low power burden resistance can be connected to the PCB.