A current transformer is an instrument that converts a large primary current into a small secondary current based on the principle of electromagnetic induction for measurement. A current transformer is composed of a closed iron core and winding. Its primary winding has very few turns and is connected in series in the circuit where the current needs to be measured. Therefore, it often has all the current flowing through the line, with a large number of turns in the secondary winding. It is connected in series in the measuring instrument and protection circuit. When the current transformer is working, its secondary circuit is always closed, so the impedance of the measuring instrument and protection circuit series coil is very small, and the working state of the current transformer is close to a short circuit. A current transformer converts a large current on the primary side into a small current on the secondary side for measurement, and the secondary side cannot be opened. The entry introduces its working principle, parameter description, classification, and usage introduction
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