What is the primary winding of the through-core current transformer?

The primary winding is the power line, which is the down lead of the power supply. The down conductor passes through the current transformer and is called the primary winding.

A transformer with a primary winding and several secondary windings wound around an iron core. The number of turns of each secondary winding is different, so its terminal voltage is also different, so the multi-winding transformer can supply power to several electrical equipment with different voltages. Three-winding transformer is the most commonly used transformer in power system.

For the step-down transformer, according to the law of conservation of energy: the output energy of the primary side of the transformer ≈ the output energy of the secondary side,

Namely: primary output energy = primary output voltage × primary current, secondary output energy = secondary output voltage × secondary current; Because the voltage on the primary side is higher than that on the secondary side, the conductor section of the primary winding is smaller than that of the secondary winding.