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28 May, 15:42

An autotransformer is used to reduce the voltage of a 100-kilovolt amp, 480-volt secondary of an isolated type transformer, to supply a 100-kilovolt amp load with 277 volts. What size autotransformer is needed? (Use the co-ratio to determine the size.)

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  1. 28 May, 16:28
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    42KVA

    Explanation:

    Given data

    High Voltage (HV) = 480V

    Low Voltage (LV) = 277V

    Fo find

    Size of transformer=?

    Solution

    To find the size of transformer here we use the co-ratio. The Co-ratio is given as:

    Co-Ratio = (HV - LV) / HV

    where

    HV is High Voltage

    LV is Low Voltage

    Now put the values we get

    Co - Ratio = (480-277) / 480=.42

    So the size of transformer is 42KVA
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