It is very clear that we cannot place sensitive electrical equipment (operating at low voltage / current) in a high current / voltage circuits. Therefore, we use an interface transformer for this purpose to reduce the current or voltage.
For voltage above 240 V and current more than 100 A using the CT (Current transformer) is necessary.
CT types:
Our discussion here is about Metering CT which used to supply the suitable current for measuring devices of electrical panel. The basis of its operation is that by analysing the voltage and current changes in the primary and secondary windings, the desired values can be measured.
CT parameters:
CT shapes:
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