A Delta-Delta transformer, also known as a Delta-Delta or Δ-Δ transformer, is a three-phase transformer configuration where both the primary and secondary windings are connected in a Delta or triangular arrangement. This configuration is used in certain applications where voltage transformation is not required, and the primary and secondary systems have the same voltage levels.
Here’s a brief explanation of the Delta-Delta transformer configuration:
- Delta (Δ) Connection on the Primary Side: On the primary side of the transformer, the three-phase windings are connected in a Delta or triangular configuration. The finish of each winding is connected to the start of the next winding, forming a closed-loop. The primary side of the Delta-Delta transformer is represented by the Greek letter “Δ.”
- Delta (Δ) Connection on the Secondary Side: Similarly, on the secondary side of the transformer, the three-phase windings are also connected in a Delta or triangular configuration. The finish of each winding is connected to the start of the next winding in a closed-loop. The secondary side of the Delta-Delta transformer is also represented by the Greek letter “Δ.”
The main application of the Delta-Delta transformer is in cases where the load requires a Delta-connected three-phase supply, and the source also provides a Delta-connected three-phase supply with the same voltage levels. Since there is no voltage transformation between the primary and secondary sides, the primary and secondary voltages remain the same in a Delta-Delta transformer.
Delta-Delta transformers are commonly used in certain industrial and commercial settings where balanced loads with similar voltage requirements are present on both sides of the transformer. Additionally, they are used in systems where there are no specific requirements for voltage transformation or when the primary and secondary systems operate at the same voltage level.
One important aspect to consider with Delta-Delta transformers is that there is no neutral connection in this configuration. This means that they are not suitable for applications requiring a neutral point reference or for supplying single-phase loads without additional configurations.
In summary, the Delta-Delta transformer is a three-phase transformer configuration used when voltage transformation is not needed, and both the primary and secondary systems have the same voltage levels. It is commonly employed in applications with balanced loads and in systems where a neutral connection is not required.