Question

You need to join three single-phase transformers together to create a three-phase transformer system that can step up the incoming voltage from 240 to 480 VAC. To accomplish this task, in which of the following arrangements should the three single-phase transformers be connected?

a. Y-delta
b. Delta-Y
c. Y-Y
d. Delta-delta

Answer 1

Final answer:

The correct arrangement to join three single-phase transformers together to create a three-phase transformer system that can step up the incoming voltage from 240 to 480 VAC is Delta-Y.

Step-by-step explanation:

To join three single-phase transformers together to create a three-phase transformer system that can step up the incoming voltage from 240 to 480 VAC, the correct arrangement is b. Delta-Y. In this arrangement, the primary side of each transformer is connected in delta (Δ) configuration, while the secondary sides are connected in Y configuration.

Answer 2

To create a three-phase transformer system for stepping up voltage from 240 to 480 VAC, the three single-phase transformers should be connected in a Y-delta (wye-delta) configuration. Option A is the answer.

Step-by-step explanation:

In this arrangement, the primary winding of the transformer forms a Y (wye) connection, and the secondary winding forms a delta connection. This configuration allows for the transformation of single-phase voltage to three-phase voltage.

Option a, Y-delta, aligns with the correct configuration for achieving the desired voltage transformation. The Y-delta arrangement is commonly used in power distribution systems for its effectiveness in converting voltage levels while maintaining proper phase relationships.

Option A is the answer.