A generator is identical to a three-phase transformer. It has three live wires and one neutral wire. The connection between the three lights is 380 volts and the connection between the zero and the light is 220 volts.
Generators come in many forms, but their operating principles are all based on the law of electromagnetic induction and the law of electromagnetic force. Therefore, the general principle of its construction is: using suitable magnetic and conductive materials to form magnetic circuits and circuits that conduct electromagnetic induction among themselves to generate electromagnetic energy and achieve the conversion goal of energy.
Single-phase 380V (two lights and one zero) and three-phase 380V (three lights and one zero) are both 380V. What's the difference? Two lights are good, why three lights?
I don't know if you made this equationequipment yourself or if you have purchased professional power generation equipment. If you made it yourself, there are many problems that you may not know about. This means that the electricity sent is 50 Hz. The output voltage of the voltage regulator you use is 220 V, but the input voltage may not reach 220 V. The compressor motors of air conditioners are all designed by professionals and use single-phase motors with a frequency of 50 Hz and a voltage of 220 V. For example, the four wires (three fire and one zero) coming out of the transformer in the rural electricity network are all connected to the household alternately, instead of all homes using a certain phase or two phases. We notice here a three-phase balance problem. When sending three phases, only one phase is used. If the other two phases have no current, it will cause an imbalance. In fact, IWe recommend connecting three air conditioners, one for each phase. The principle is that the power of the generator must be sufficiently large. There is also the problem of parallel and series connection. If connected, there will be a short circuit between the phases. The generator will be completed immediately.
Is 380 volts two live wires or three live wires and a zero? Detailed Explanation
You have misunderstood that 380V refers to line voltage and 220V refers to phase voltage.
In real 380V lines, there is usually no neutral wire, only phase wires and ground wires, and it is a three-phase, four-wire system. If the equipment requires it, the neutral line can be added to the three-phase, five-wire system.
There is therefore no single phase in the 380V line, at least two phases are used.
The method of connecting two live wires and one wireThe neutral you mentioned uses a two phase 220 line. If it is 380V there is no need for a neutral wire.
Basic knowledge: In the three-phase five-wire system, the voltage of each element on the neutral line is 220 V, called phase voltage, and the voltage between each of the two phases is 380 V , which is called line voltage.
The most obvious application of three-phase is the electric motor. Three-phase alternating current can easily change the direction of the motor.
Two live wires
The neutral wire is at zero potential, and the earth is also at zero potential. The voltage between the live wire and the neutral wire is 220 V. and the voltage between the two live wires is 380 V. If your hand touches a live wire, the electric shock voltage is 220 V between the earth and earth. If each hand touches a live wire, the electric shock voltage is 380 V.
Ifthe machine is three phase 380V, connect three live wires. The neutral wire does not need to be connected. If the machine is single phase 380V, connect two live wires.
One. hot and a zero is 220 volts, and two live wires of different phases are 380 volts
The voltage between the live wire and the neutral wire is 220 volts, called "line voltage";< /p>
The voltage between the two live wires is 380 volts, called “phase voltage”. ".
It can be understood 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 phase angle differs by 120 degrees, which is called three-phase ABC in daily life;
2. star connection wires", 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 keep the potential of the neutral point at 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.
4. Line voltage and 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 the neutral line is called phase voltage (usually 220 V), and a loopis 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
Detailed information:First, let's briefly talk about line voltage and phase voltage: Line voltage is the voltage between the live wire and the live wire, which is 380 V. , and the 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 threeABC phases. 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>
In addition, the phase voltage is three-phase ABC. The voltage from any phase to ground, that is, the voltage at the working neutral line, is the phase voltage. On the vector diagram we can see it. that the relationship between it and the line voltage is √3 times, that is, the line voltage is the phase voltage √3 times. They all fluctuate up and down the two voltage values above. In actual operation, they are not. at precise values of 220V and 380V.running.
Reference source:EnBaidu Encyclopedia – Line Voltage
Baidu Encyclopedia – Phase Voltage