Problem 91-10    Source:  Problem developed by the site author.

An ideal single-phase 10 kVA transformer has a transformation ratio a = 4. It is connected as a voltage reducer to a power grid 880 V, 60 Hz. Find:

a) the voltage in the secondary.

b) the current in the primary.

c) the current in the secondary.

Solution of the Problem 91-10

Item a

To solve this item we will use eq. 91-02 repeated below.

Replacing the variables with their respective numerical values, we obtain:

Item b

Knowing the transformer power and its primary voltage, we have:

Item c

As we know the transformation ratio and the primary current, calculated in item b, we have: