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Current Transformers

Current Transformers
Current Transformers
A current transformer is an application-specific transformer designed to measure alternating current.

As an instrument transformer, a current transformer scales a large current value into a smaller current value that is easier for instruments and relays to handle. This isolates the instrument circuit from the main power circuit, which helps protect equipment and improve performance.

Current transformers are built like any other transformer, with primary and secondary windings and a core. Current that passes through the primary winding is proportionally transformed through induction into the secondary winding before it supplies the instrument circuit. This secondary current value is more useful for low-voltage applications.

Current Transformers: Learn About Current Transformers Here > A Current Transformer is used with an ammeter to measure current in AC voltages. Current Transformers are also known as instrument transformers or accurate ratio transformers. They transform at an accurate ratio to allow an attached instrument to gauge the current without actually running full power through the instrument. It is required to transform relatively small amounts of power because its only load, called a burden, is the delicate moving elements of an ammeter.

The transformer that measures the potential difference in AC voltages and uses a voltmeter is known as a potential instrument transformer.