One of the most important and ubiquitous electrical machines is the transformer. It receives power at one voltage and d

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One of the most important and ubiquitous electrical machines is the transformer. It receives power at one
voltage and delivers it at another. This conversion aids the efficient long-distance transmission of electrical
power from generating stations. Since power lines incur significant I 2 R losses, it is important to minimize these losses by the use of high voltages. The same power can be delivered by high-voltage circuits at a fraction
of the current required for low-voltage circuits. A 250 kVA, 11 000 V/400 V, 50 Hz single-phase transformer
has 80 turns on the secondary.
Calculate:

a) the approximate values of the primary and secondary currents;
b) the approximate number of primary turns;

c) the maximum value of the flux