In a Wye-Delta system, if the phase voltage of the Wye generator is 120V and its Phase Current is 3A, what are the voltage and current of the load?

In a Wye-Delta system, the relationship between the phase and line voltages and currents is fundamental to understanding how power is transformed between the two configurations.

When converting from a Wye (star) connection to a Delta connection, the voltage in the Delta configuration is √3 times the phase voltage of the Wye connection. Since the phase voltage of the Wye generator is given as 120V, the line voltage in the Delta configuration can be calculated as follows:

Line Voltage (Delta) = Phase Voltage (Wye) × √3

= 120V × √3 ≈ 208V.

This is why the voltage of the load in the Delta configuration is approximately 208V.

Furthermore, the current transformation between the configurations also follows specific rules. The phase current in the Wye connection becomes the line current in the Delta configuration divided by √3. Therefore, the load current can be calculated as:

Load Current (Delta) = Phase Current (Wye) / √3

= 3A / √3 ≈ 1.7A.

This results in the load current in the Delta configuration being around 1.7A.

Thus, the load voltage and current in the Delta configuration—208