What is current transformer

FAQ | Feb 03,2023

Current transformer is a measuring instrument that converts the high current of the primary side into the low current of the secondary side according to the principle of electromagnetic induction.

Current transformer consists of a closed iron core and winding. It has a small number of turns in the primary side winding and is connected to the line where the current needs to be measured. As a result, it often has all the line current flowing through it, and the secondary winding has a large number of turns. It is in series in the measuring instrument and protection circuit.

When the CT is working, the secondary loop is always in the closed state. Therefore, the impedance between the series coil of the measuring instrument and the protection circuit is very small, and the working state of the CT is close to short circuit.

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