Problem 91-8    Source:  Adaptade example 2.4 - page 98 - SAHDEV, S. K. -    Book: Electrical Machines - 1ª edição - Cambridge University Press - 2018.

A 13.2 kV/220 V, 60 Hz transformer has a rating of 11 Volts/turn. The maximum magnetic flux density of the core is 1 T. Find:

a) The number of turns of the primary and secondary windings.

b) The cross-sectional area of ​​the core.

Solution of the Problem 91-8

Item a

Knowing the volts/turn ratio and the primary voltage, it is possible to calculate the number of turns of the primary by applying the equation below.

Applying the same reasoning, the number of turns of the secondary is:

Item b

To calculate the cross-sectional area of ​​the core, we will use equations eq. 91-13 (or eq. 91-12) and eq. 75-11a. Thus, we have:

Replacing the variables by their respective numerical values ​​and, after an algebraic arrangement, we find the value of A.