Is it possible to increase the voltage in the house with a transformer?

Alexander asks:
Good afternoon. Interested in the question of how to increase the voltage in the network? Voltage drops to 140-170V. This does not happen all the time. Is it possible to connect a voltage boost transformer via a relay so that when the voltage is 220V, the relay disconnects the transformer and the devices work from the network, and if the voltage drops, the transformer is reconnected. Is it possible to do this and how to connect it all?
The answer to the question:
Good afternoon - just put a voltage regulator. The transformer and circuit will come out more expensive. Plus, you need to either collect something with a microcontroller to turn on the transformer relay or switch through a voltage relay.
But you can do this:
The voltage relay where the output is a three-pin relay (normally-closed and normally-open contact). In it, when the voltage goes beyond the set limits, this relay is triggered by switching the NC and HP pair. Thus feeding or disconnecting the phase from the load. Then connect the relay and your transformer to the normally open pair.

p.s. Better buy a voltage regulator. And it will take less space and will be cheaper and more stable as a result. If it’s expensive, buy stabilizers small, individual, only for particularly expensive and important devices (refrigerator, washing machine, computer). But the main problem is your 140V - for most stabilizers it is too little ....

By the way, you can do the same as you ask, but not on a transformer, but on an autotransformer - it will be better.

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