What Is A Current Transformer

The current transformer is an instrument that converts the large current on the primary side into a small current on the secondary side according to the principle of electromagnetic induction. A current transformer consists of a closed core and windings. It has a small number of turns in the primary winding and is strung in the line where the current needs to be measured.

Therefore, it often has all the current flowing through the line, the number of turns of the secondary side winding is more, connected in series in the measuring instrument and protection loop, when the current transformer is working, its secondary side loop is always closed, so the impedance of the measuring instrument and the protection loop series coil is very small, and the working state of the current transformer is close to short circuit. The current transformer converts the large current on the primary side into a small current on the secondary side to measure, and the secondary side cannot be open. The entry introduces its working principle, parameter description, classification, introduction to use, etc.