Power Factor and Single Phase Transformer

[fatmoe]

What is the secondary current in a single-phase distribution transformer that is attached to a 480v line when the transformer is supplying 120v to a 16kW reactive load with a power factor angle of 40°.

So I have kVA = 16kW/cos 40 = 20.89kVA

Is = 1000 * 20.89kVA / 120v = 174A.

I don't know if I did this question correctly. Do you not have to use the 480v for anything?

 

[gneill]

Hi fatmoe,

In future please retain and use the Homework Format Template provided when you start a new thread in the Homework Help sections of PF.

What is the secondary current in a single-phase distribution transformer that is attached to a 480v line when the transformer is supplying 120v to a 16kW reactive load with a power factor angle of 40°.

So I have kVA = 16kW/cos 40 = 20.89kVA

Is = 1000 * 20.89kVA / 120v = 174A.

I don't know if I did this question correctly. Do you not have to use the 480v for anything?

Your calculation looks fine for finding the magnitude of the current in the secondary.