A current transformer is an instrument that uses the principle of electromagnetic induction to convert a large current on the primary side into a small current on the secondary side. A current transformer consists of a closed iron core and windings. Its primary winding has several turns, strung on the current line that needs to be measured.
Construct:
Strip current transformer:
This type of current transformer uses the actual cable or busbar of the main circuit as the primary winding, which is equivalent to a single turn. They are fully insulated from high operating voltages.
Wound Current Transformer:
The transformer's primary winding is in series with the conductor that carries the measurement current flowing in the circuit.
Ring/Window Current Transformer:
These do not contain primary windings. Instead, the lines that carry the current flowing in the network go through windows or holes in the toroidal transformer. Some current transformers have a "split core" that can be opened, installed, and closed without breaking the circuit to which they are connected.
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