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  Auto transformer: Auto transformer is kind of transformer, where primary and secondary shares some common single winding. So basically its one winding transformer Auto transformer employs only single winding per phase as against two distinctly separate windings in a conventional transformer. Applications of auto transformer : -compensating the voltage drops by boosting supply voltage in distribution system. -auto transformer with a number of tapping are used for starting induction and synchronous motor.  -auto transformer is used as variac in laboratory or continuous variable over broad  ranges are required.  Instrument transformer : It is used in AC system for measurement of electrical quantities i.e. Voltage, current, power, energy, power factor, frequency. It is also used with protective relays for protection of power system. Basic function of instrument is to step down the ac system voltage and current. Types of instrument transformer : Parameter type : -curren...