A ratio of 1 to 2 for a low side voltage rating of a three-phase transformer bank indicates which type of connection?

A ratio of 1 to 2 for a low side voltage rating of a three-phase transformer bank indicates a delta connection due to the nature of how delta configurations work in transforming voltage levels. In a delta connection, each phase winding is connected end-to-end in a triangular formation. This configuration allows the transformer to maintain a voltage relationship between the primary (high voltage) and secondary (low voltage) sides that often reflects a specific ratio based on how the windings are configured.

When a transformer bank has a low side voltage rating that indicates a step-down process, the delta connection is particularly advantageous because it keeps the line-to-line voltage consistent while allowing for different levels of line-to-neutral voltage. The delta connection can provide a higher current capacity, making it effective for applications that require substantial power delivery.

While wye connections and open delta configurations can also be used in three-phase systems, they typically would show a different voltage ratio configuration that aligns more closely with their specific winding arrangements and respective phase relationships. Wye connections, for instance, would generally show the relationship associated with line-to-neutral calculations and usually do not produce a 1 to 2 voltage ratio in the same context as a delta does. Star is another term for the wye configuration and would