How to make 380 from 220 volts?
What is important to know
In a three-phase network, all three phases have a shift of 120 degrees. If it were necessary to make the conversion of a three-phase 220 Volt to 380V, or a single-phase 220 to the same, but with a voltage of 380 V, then this is done very simply due to the usual step-up transformer. In this problem, it is necessary not just to increase the voltage value, but to obtain a full three-phase network from a single-phase network.
There are three main ways you can do this manipulation:
- using an electronic converter (inverter);
- by connecting two additional phases;
- due to the use of a three-phase transformer, but at the same time the power is still reduced.
Before converting the mains voltage, you need to consider whether it is possible to connect the motor to a standard single-phase network without loss of power. First you need to consider the plate on the engine itself, some of them are designed for both of these voltages, as shown in the first photo. You just need a capacitor to start.
The second plate shows that the machine is designed exclusively for connecting the windings with a star and the voltage is respectively 380 Volts:
You can, of course, disassemble the motor and find the ends of the windings, but this is already problematic. Let us dwell in more detail on creating a high-quality three-phase network of 380 V out of 220.
Methods for producing 380 V from 220
This device is more commonly known as an inverter, and it consists of several blocks. To begin with, the device rectifies this single-phase voltage, and then inverts it into a variable of a given frequency. In this case, there can be any number of phases with a shift by a certain degree, but it is optimal for the work of generally accepted standard electrical equipment to be three and, accordingly, their shift is 120 degrees. To make such a complex device at home is very problematic, therefore it is recommended to simply buy it, in addition, the market for these products is very developed.
Here is the circuit diagram of the inverter:
And so it looks in the factory building:
Often, these devices not only convert single-phase to three-phase voltage, but also protect motors from overload, short circuit and overheating.
Three Phase Usage Method
This method must be agreed with Energonadzor or the company supplier of electric energy, as this requires the connection of two additional phases from the panel, which are on each floor of apartment buildings.
The main question here is not how to redo a single-phase voltage, but how to connect it, and for this, just a three-phase extension cord is enough, and if everything is legal to do, then a meter.
Three phase transformer
To make 380 volts out of 220 volts, you need a three-phase transformer of the required power for the voltage of one of the windings 220, and the other 380 V. Most often, they already have windings connected to a star or triangle. After that, the voltage from the network is connected to the two phases of the winding from the lower side directly, and to the third terminal through the capacitor. The capacitance of the capacitor is calculated from the ratio of 7 μF for every 100 watts of power. The rated voltage of the capacitor must be at least 400 volts. Without load, such a device cannot be connected. At the same time, there will still be a decrease in both engine power and its efficiency. If the converter is carried out using an electric motor, and not a transformer, then the output will be a three-phase voltage, but its value will be the same as in the network, namely 220 V.
The conclusion suggests itself - it is possible to solve the problem only by an inverter electronic method, by installing one high-quality and full-fledged single-phase voltage converter. Well, or by creating a generator-engine system, where the role of a generator, like at a power plant, will be played by a synchronous generator, and the role of a drive mechanism can be played by a single-phase engine (for example, from a vacuum cleaner), but at home this is absolutely not justified and inexpedient. We hope you now know how to get 380 volts from 220 in an apartment and a private house!
It will be useful to read: