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What is current transformer
Apr 07, 2018

The current transformer [1] is an instrument that measures the primary side current into secondary side small current according to the principle of electromagnetic induction. Current transformers consist of closed cores and windings. Its primary winding has a small number of turns, which is in the line of the current to be measured.

Therefore, it often has all the current flowing through the line, and the number of turns on the secondary side is relatively large. It is connected in series with the measuring instrument and the protection circuit. When the current transformer is working, its secondary circuit is always closed, so the measurement is performed. The impedance of the series coil of the instrument and the protection circuit is very small, and the working state of the current transformer is close to a short circuit. The current transformer is measured by converting the primary side current into secondary current and the secondary side cannot be opened. The entry introduces its working principle, parameter description, classification, usage introduction and so on.