What transformer configuration is required for three 2300V transformers to achieve a 240V secondary?

To achieve a 240V secondary from three transformers that are each rated for 2300V, a wye-delta configuration is used. In this arrangement, the primary windings of the transformers are connected in a wye configuration, which allows them to handle the higher voltage efficiently and provides a neutral point. This minimizes the voltage stress on each individual transformer while maximizing the line-to-line voltage available at the secondary side.

The delta configuration on the secondary side allows the voltage to step down effectively. When using this configuration, the line voltage in a delta connection is equal to the phase voltage multiplied by the square root of 3. Therefore, for a secondary voltage of 240V, the transformers can step down the voltage accordingly by properly selecting turns ratios.

This configuration is particularly advantageous in systems where balancing loads is important and helps to reduce potential issues with phase imbalances or overheating in the transformers.