Solve Problem 2.19 if the transformer is to supply 1080 V form a 1200 V bus. Problem 2.19 A…

Solve Problem 2.19 if the transformer is to supply 1080 V form a 1200 V bus.

Problem 2.19

A single-phase transformer rat e d 30 kVA, 1 200/ 1 20 V is connected as an auto transformer to supply 1 320V from a 1200 V bus.

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(a) Draw a diagram of the transformer connections showing the polarity marks on the windings and directions chose n as positive for Current in each winding so that the currents will be in phase.

(b) Mark on the diagram the values of rated current in the windings and at the input and output.

(c) Determine the rated ki lovoltamperes of the unit as an autotransformer.

(d) If the efficiency of the transformer connected for 1200/120 Y operation at rated load unit power factor is 97%, determine its efficiency as an auto transformer with rated current in the windings and operating at rated voltage to supply a load at unity power factor.

 

 

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