Z-circuit

In the Z circuit, the input or output winding of a three-phase transformer is divided into two coils. The magnetic coupling with two phases creates a balancing effect that better distributes uneven phase currents and reduces voltage unbalances.

This type of circuit is particularly suitable for applications where a high degree of symmetry of the currents or voltages is required.

However, compared to the star or delta connection, the Z connection requires around a third more power and more wiring. In practice, it is therefore mainly used when its specific advantages are specifically required.

For further information, see switching group.