Tapping in Transformer PPT download(power point presentation)

INTRODUCTION:-

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                      Tapping's are provided on a transformer winding for selecting cutting out a certain number of turns on the transformer winding thus obtaining a variable turns ratio.

                      This is done in order to maintain the output voltage within desirable limits because the equipments work satisfactorily at a somewhat fixed voltage and voltage variation is a common phenomenon in the power system.

MATHEMATICAL EXPRESS:-

                       Suppose I have a transformer as follows:

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No. of primary turns = 1000No. of secondary turns = 100

Turns ratio = 1000:100 = 10:1

                       Now assume that the volatge has suddenly drops to 50V. I still want 10V to be available at the secondary. If cut out 500 turns from the primary, the new turns ratio will be

500:100 = 5:1

                      Now with 50V applied to the primary, I still get 10V at the secondary. The transformer tappings serve this purpose of cutting out the turns.

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