2.16. A 25-Hz, 120-V/30-V, 500-VA transformer is to be used on a 60-Hz source. If the core flux… 1 answer below »

2.16.                           A 25-Hz, 120-V/30-V, 500-VA transformer is to be used on a 60-Hz source. Ifthe core flux density is to remain unchanged, determine (a) the maximum permissible primary voltage, and (b) the new (60-Hz) rated secondary voltage and current.

(a)    By (2.9), the primary voltage will vary directly with frequency. Hence, maximum  primary  voltage   =  60  (120)  =  288 V

25

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rated  V2   =

(b)

60  (30)  = 72 V

25

rated /2

= 500

30

=  16.67  A   (same  as  at 25  Hz)

 

 

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