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Our Booster transformers are used towards the end of a power line to raise the voltage to the desired value. It is used for controlling the voltage of a feeder at a point far away from the main transformer. The secondary of the booster transformer is connected in series with the line, and its primary is supplied from the secondary of the regulating transformer.
By changing taps on the regulating transformer, the magnitude of the voltage at the end of the line can be changed and thus feeder voltage can be regulated. The rating of regulating transformer is only a fraction of that of the main transformer. It is given by the expression.
The advantage of the above system is that the regulating equipment is independent of the main transformer so that a failure in the former will not throw the latter out of service. A booster transformer is used in railways for eliminating the flow of stray current. The stray current disturbs the communication system and also damages the electronic devices of the trains passing through them.