2.41. Which transformer would you expect to be the heavier, a 25-Hz unit or a 60-Hz unit o f ident…

2.41.             Which transformer would you expect to be the heavier, a 25-Hz unit or a 60-Hz unit of  identical voltampere rating  and identical  secondary voltage rating?   Explain.

Ans. From (2.9) it follows that 25-Hz transformer requires a greater flux as compared to a 60-Hz. This implies a greater core cross section for the 25-Hz transformer (for the same Bmax). Hence the 25-Hz transformer  is heavier.

 

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2.42.             A transformer is rated 1-kVA, 240-V/120-V, 60-Hz. Because of an emergency, this transformer has to be used on a 50°Hz system. If the flux density in the transformer core is to be kept the same as at 60 Hz and 240 V: (a) What voltage should be applied at 50 Hz? (b) What is the voltampere rating at 50 Hz?     Ans.    (a)  200 V;     (b)  0.833 kVA

 

 

 

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