So, for some needs, you needed to have full-fledged 380 Volts at home. Why do I emphasize the word "complete"? Yes, because I want to immediately discard the use of a 3-phase inverter in solving this issue, the generator-motor circuit and other maneuvers with capacitors ...
Today I want to talk about how to get 380 volts at home, in the easiest and cheapest way. Moreover, it is absolutely legal (although there will be small nuances).
Why You Need It?
Most likely, you may only need 380 volts to power a 3-phase electric motor rated for this voltage. You don't want to use a circuit with capacitors because with this method, the engine power is reduced, and there are no financial opportunities to buy an expensive inverter. You also don’t want to register a connection to 380 in the RES ... for some reason.
In addition, you plan to use this engine rarely. Therefore, you want to get this tension quickly, simply and with minimal financial investment.
I won't fool you anymore with a long intro... Let's get down to business!!!
Where to get 380 volts?
So you live in the private sector. There is an overhead power line along the street, from which your house is actually powered. Your neighbors are also powered from this line. Logically.
But! In order to symmetrically distribute the load, the RES connected your houses to phases "A", "B" and "C" in a checkerboard pattern (ideal conditions) or randomly (life realities).
I will consider ideal conditions, and you can see for yourself how it is with you ...
You carefully examined your line and noticed that you are connected to phase "B", Lyokha's neighbor is connected to phase "A", Baba Masha is connected to phase "C". Catch a thought?
And so, you take 0.5, and preferably 2 to 0.5 (so as not to run twice) and go to Lyokha for negotiations. As a result of the negotiations, you need to get Lyokha's consent to use his phase wire before opening the second half liter. The connection point is, of course, after the counter.
How you agree to compensate for the spent electricity is up to you. For example, you can put an additional meter somewhere in the garage ... And then you will help him pay his electricity bills every month.
Then you go to Baba Masha. Here, a different approach is needed. You need to convince her that everything is legal and safe. And of course, seduce with some material goods. I don’t know your grandmother Masha, so I can’t give precise advice on negotiations.
Now further. The negotiations were successful. Consent received.
Getting 380 volts at home.
Your connection diagram will look something like this:
At the connection point at the neighbors, be sure to install an automatic machine with a rated current not higher than the one at its input. I recommend using a phase control relay. Suddenly, Lyokha's automatic machine will knock out ... Only 2 phases will come to your engine. The phase control relay will remove power from the magnetic starter (K1) and the motor will be de-energized.
To turn on the magnetic starter, use the self-pickup circuit, as in the figure below. By pressing the start button, you apply voltage to the starter coil. Power contacts and control contacts (K1.1) will close. The control contact (K1.1) will bypass the button contact. You release the start button and the current now goes through K1.1.
To turn off the engine, you will need to press the stop button. A short-term break in the power supply circuit of the starter coil will lead to the opening of the power and control contacts.
Don't forget to ground the motor.
And here's something else. This scheme should not be applied if you are some private enterprise for the production of something there ... Your neighbors may have a clause in the contract with the RES that prohibits subconsumption. There may be trouble.
And if it's for personal use - everything is legal. I talked to a representative of the RES about this. Of course, he smiled, but said that their office would not have any questions about such fraud (as long as they connected after the counter). Except for the case mentioned above. You can also consult in the RES to calm Masha down :)