Definition of current transformer

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A current transformer is a type of instrument transformer that is used to step down high currents to a lower, more manageable level for measurement or protection purposes.

Current transformers are typically used in conjunction with ammeters, wattmeters, and protective relays.
They have a primary winding that is connected in series with the circuit carrying the current to be measured, and a secondary winding that is connected to the measuring or protection device.
The secondary current is proportional to the primary current, but at a reduced value.
Current transformers are designed to have a high degree of accuracy and linearity over a specified range of currents.
They are commonly used in power systems to monitor and protect equipment from overcurrent conditions.
Examples of current transformer ratios include 100:5, 200:5, and 400:5.

Definition of current transformer

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