Current transformer is an instrument that converts a large current at the primary side into a small current at the secondary side according to the principle of electromagnetic induction. Current transformer is composed of closed core and winding. The number of turns of its primary winding is very small, and it is connected in series in the circuit that needs to measure the current.

Therefore, it often has all the current flowing through the line. The secondary side winding has a large number of turns and is connected in series in the measuring instrument and protection circuit. When the current transformer is working, its secondary side circuit is always closed. Therefore, the impedance of the series coil of the measuring instrument and protection circuit is very small, and the working state of the current transformer is close to short circuit. The current transformer converts the large current at the primary side into the small current at the secondary side for measurement, and the secondary side shall not be open circuit.

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