Discussion
A 75 kVA transformer is to be paralleled with a 200 kVA transformer. Both the transformers have a turn ratio equivalent to their 2400-240 voltage ratio, and are operated in step down mode. The rated high side current of each transformer is ______, respectively.
Answer: A
The rated high side current is the kVA divided by the high side voltage, \(I = \dfrac{S}{V}\). The high side voltage is 2400 V.
\[ I_1 = \frac{75 \times 10^3}{2400} = 31.25\ \text{A} \]
\[ I_2 = \frac{200 \times 10^3}{2400} = 83.33\ \text{A} \]
The other options are 10 or 100 times too large or too small, which would come from taking the kVA as VA or the voltage as 240 V. The answer is 31.25 A and 83.33 A, option A.
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