How does the load split on a delta transformer bank?

In a delta transformer bank configuration, the way the load is distributed depends on the placement of the transformers within the system. Specifically, in a three-phase delta configuration, the two outside transformers each handle one-third of the load, while the center transformer carries the remaining two-thirds of the load. This uneven distribution occurs because the delta connection allows each transformer to share the current and voltage levels differently.

The center transformer is often located at the junction point of the delta and, due to its position, is subjected to higher line voltages and therefore takes on a larger share of the current. This design efficiently balances the load across the system while managing the voltage and current requirements during operation. Understanding this load distribution is crucial for the operation and maintenance of the transformer bank to ensure optimal performance and prevent overload conditions.