Is 380 volts two live wires or three wires and one zero Detailed explanation?

The voltage between the live wire and the neutral wire is 220 volts, called "line voltage ";

The voltage between the two live wires is 380 volts, called the "phase voltage."

This can beunderstood like this:

1. Three-phase electricity - three fixed coils in the generator. Their movement in the magnetic field produces three induced voltages, and each voltage is the same. the phase angle differs by 120 degrees, which is called three-phase ABC in daily life;

2. If the three-phase electrical output connection of the generator adopts the "three-phase four-wire star connection", there will be a neutral line A and three-phase lines;

3. Neutral line - the low voltage side of the transformer generally adopts a Y-shaped connection. The neutral point is connected to the ground with a wire, and a wire is removed at the neutral point. This wire is the neutral wire. The advantage of the neutral line is to maintain the potential. from the neutral point to zero, so that the voltage between the phase lines (wires removed from phases A, B and C) and the neutral line remains relatively stable, which is beneficial to the use of electrical appliances. p>

4.ension and line current - the voltage between phase lines is called line voltage (for example, the voltage between phase lines AB is generally 380V), and the voltage between phase lines is called line voltage . The current generated by forming a loop is called line current.

Phase voltage, phase current - the voltage between the phase line and neutral line is called phase voltage (usually 220 V), and a loop is formed between the phase line and the neutral line. The current generated is the phase current

5. Bus bar - the main line of the transmission line is called bus bar

6. Phase voltage is the voltage between. each phase and the ground. Line voltage is phase-to-phase voltage. For a three-phase, four-wire system, the phase voltage is 220 volts and the line voltage is 380 volts. The relationship between the two is 1.732

First of all, pLet's briefly talk about line voltage and phase voltage: Line voltage is the voltage between live wire and live wire, which is 380V. , and phase voltage is one of the three live wires. The voltage between the live wire and the neutral wire is 220V;

The voltage is reduced by the transformer to meet our needs. The transformer adopts a star connection, with three live wires. These are three phases of ABC. The neutral point is connected to zero and a neutral line is drawn;

We can clearly see from the voltage vector diagram that. the line voltage is √3 times the phase voltage, the voltage between any two elements of phase A, phase B and phase C drawn from the secondary side of the transformer is 380 V, so the voltage between the two live wires is 380 V; /p>

Also, phase voltage is the voltage to ground of one of the three phases ABC, that is-i.e. the voltage at the working neutral line. This is the phase voltage. The relationship between this and the line voltage can be seen. vector diagram like √3 times. That is, the line voltage is √3 times the phase voltage; so the phase voltage is 380% √3=219.4, which we often call 220V;

Finally, let me tell you that 220V and 380V are what we call often, in fact, the voltage fluctuates up and down according to the above two voltage values, and the actual operation does not operate at the precise values. 220V and 380V.

Baidu Encyclopedia – Line Voltage

Baidu Encyclopedia – Phase Voltage