In order to keep secondary voltage constant, tap changers are used to compensate portage fluctuations occurring on the network.
According to the customer requirements, tap changing can be done well either the transformer is energized on load or not energized.
For the transformers with the on load tap changer, changing operation may be done from the transformer motor assisted mechanisms or from the remote control center away from the transformer.
In the case requested by the customer this procedure can also be performed fully automatically by means of electronic voltage regulators. Manual and automatic operation positions are available. No-load tap changer are used switching manually from the transformer.

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