how does a step up transformer work on three phase?

A step-up transformer in a three-phase system increases the voltage while decreasing the current. It consists of three sets of windings, one for each phase, arranged to create a magnetic field. When an alternating current flows through the primary windings, it induces a higher voltage in the secondary windings due to the turns ratio. This transformation allows for efficient long-distance power transmission, reducing energy losses associated with higher currents.