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The basic concept of current transformer
Apr 07, 2018

Current transformer principle [2] is based on the principle of electromagnetic induction. Current transformers consist of closed cores and windings. Its primary winding has few turns and is strung in the circuit of the current to be measured. Therefore, it often has all the current of the line flowing, the number of turns of the secondary winding is relatively large, and it is connected in series with the measuring instrument and the protection circuit, and the current mutual inductance. When the device is in operation, its secondary circuit is always closed, so the impedance of the series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to a short circuit.