Answer to Question #275122 in Electrical Engineering for Queue

Question #275122

A 20 kVA closet transformer located inside a building is used to step down the voltage for the building. It is connected to a primary 4800 V AC power source. The ratio of the number of primary windings to the number of secondary windings on the transformer is 20 to 1 and 40 to 1.

a. Approximate the secondary voltage provided.

b. Approximate the current available, in amps


1
Expert's answer
2021-12-06T06:31:04-0500

a. Approximate the secondary voltage provided:

V21=4800/20=240 V,V22=4800/40=120 V.V_{21}=4800/20=240\text{ V},\\ V_{22}=4800/40=120\text{ V}.

b. Approximate the current available:


I21=20000/240=83.3 A,I22=20000/120=167 A.I_{21}=20000/240=83.3\text{ A},\\ I_{22}=20000/120=167\text{ A}.


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