The difference between single-phase 220V inverter and three-phase 220V inverter

2021-07-20 10:00:42 jact_elec

The difference between single-phase 220V inverter and three-phase 220V inverterHello everyone, the new day editor brings you a new question and answer content. On the electrical service cloud platform, a friend asked: "What is the difference between a three-phase 220V or a single-phase 220V access inverter?"

The inverters we often talk about are generally low-voltage inverters, and low-voltage inverters are classified according to power supply voltage, and are divided into single-phase inverters (single-phase 220V) and three-phase inverters (three-phase 380V, three-phase 660V).

MetInfo enterprise content manager system | MetInfo CMS

The biggest difference between a single-phase inverter and a three-phase inverter is that the power supply of a single-phase inverter is 220V composed of a live wire and a neutral wire.

Because it is a live wire, it is called a single-phase inverter. The three-phase inverter is originally a three-wire input, so it is called a three-phase inverter, also known as a three-phase electric input type inverter.

In addition, the output voltage of single-phase inverters is divided into single-phase output and three-phase output. Only single-phase output is non-standard and easy to break.

It is single-in and single-out. Generally, no manufacturer makes it. The standard is single-phase. The inverter is single-phase in, three-phase out, and the three-phase output here will not exceed the power supply voltage, if it is single-phase 220V input, then the output is three-phase 220V, which is a bit different from the three-phase inverter output Yes, then their corresponding motor wiring methods are a bit different.

If the wiring does not match the voltage, the motor is weak.

Single-phase input: It means that the power supply input has only two wires (a neutral wire and a live wire), and the phase voltage of the input voltage is 220V.

Three-phase input: It refers to the power supply input has three lines (three-phase three-wire) or four lines (three-phase four-wire), generally three-phase four-wire is relatively more. Input three live wires, one neutral wire, the phase voltage of each live wire to the neutral wire is 220V, and the line voltage between the three live wires is 380V.

MetInfo enterprise content manager system | MetInfo CMS

When the power is the same, the current of the single-phase power supply is equal to the power/220V, assuming the power is 1000W, then the current is equal to 4.54A, and the current on each live wire of the three-phase power supply is equivalent to one third of the total current, which is 4.54/ 3=1.5A, so the requirements for wires are slightly lower, and thinner wires can be used.

It is worth noting that three-phase power is generally only available in industrial power applications. Most household power only uses single-phase power (a live wire and a neutral wire, plus a ground wire), then a three-phase power supply inverter Cannot be used.

The single-phase power supply inverter can be used where there is three-phase four-wire power supply (connect one of the live wire and one of the neutral wires). Therefore, be sure to confirm the power supply of the installation location before purchasing.