Discussion
An autotransformer is used:
Answer: D
An autotransformer is used When the transformation ratio is small.
In an autotransformer part of the winding is common to primary and secondary, and only part of the power is transformed inductively. The saving in copper compared with a two-winding transformer is a fraction \(k\) of it, where \(k\) is the voltage ratio (\(V_{2}/V_{1} \lt 1\)), so the saving is greatest when the two voltages are close, for example between 220 kV and 132 kV.
Lower copper loss and higher efficiency are consequences of that saving and are only significant when the ratio is near one, so they are not the condition for choosing it. The availability of an operator has nothing to do with it.
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