What is current transformer?

Question

Accepted Answer

A current transformer is a device used to measure or monitor electric current by transforming high currents into lower, more manageable levels.

Current transformers are commonly used in electrical power systems to measure current flowing through a conductor.
They consist of a primary winding and a secondary winding, with the primary winding connected in series with the current to be measured.
The secondary winding is connected to a measuring or monitoring device, such as an ammeter or a protective relay.
The turns ratio between the primary and secondary windings determines the amount of current transformation.
Current transformers provide electrical isolation and step-down the current to a level suitable for measurement or protection purposes.
They are often used in conjunction with voltage transformers to accurately measure power in high-voltage systems.
Current transformers are essential in various applications, including power generation, transmission, and distribution systems, as well as industrial processes and equipment.
Example: A current transformer may be used in a substation to measure the current flowing through a high-voltage transmission line.

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