Three phase electricity, why is the ABC three strand electric interconnection 380V, and they are con

Because the voltage is the potential difference, it is connected to A, the potential difference is zero, and it cannot work. If it is connected to a b or a c, it may burn.

Three-phase electricity is a group of three-phase alternating current with equal amplitude, equal frequency and 120o phase difference between each other, which is generated by a three-phase generator with three windings, and is a commonly used power supply in industry. For example, motors use three-phase alternating current, which is often referred to as the three-phase four-wire system. In daily life, single-phase power supply, also known as lighting electricity, is mostly used.

When lighting electricity is used, one of the three phases is used to supply power to the consumer, such as household appliances, and the other wire is the fourth wire in the three-phase four-wire, that is, the neutral line, which leads from the neutral point of the three-phase electricity.

This is a matter of line voltage and phase voltage, if the single-phase motor is connected to A, the motor is just live and will not have any action, because it has no voltage, I hope you refer to some books on the basics of alternating current. Thank you!

If you connect A like this, the motor will run out of power. Because in this way the zero fire wire of the motor has equal potential.

The voltage between the three-phase ABC and the neutral line is 220V, but the phase difference between the three-phase electricity is 120°, so the voltage of the ABC is 220V * (root number 3) = 380V.

Because the voltage to the ground of the three phases is 220V, if the single-phase motor is connected to the A motor, it will not turn, and any phase must be a b c any phase as the live wire, and the other phase is connected to the zero line.

The voltage is the potential difference, which is connected to A, and the potential difference is zero and cannot work. If it is connected to a b or a c, it may burn.

The characteristics of the power supply of the star connection method are that the line voltage is 3 times the root number of the phase voltage, the concept of line voltage and phase voltage, and then 380 is the interphase voltage, that is, the line voltage, 220 is the phase voltage, and the relationship between the root number is just 3 times. Single-phase motors generally have a starting winding and a running winding, the starting winding is connected in series with the starting capacitor and the running winding and connected to the 220 voltage that works normally, the two you said are connected to A, it will not burn out, because no voltage is added to the coil, of course, the motor will not work. I don't know if this will help you.

1. When the transformer lowers the high-voltage voltage to 380V (line voltage), it will connect a zero line through the transformer, commonly known as "three-phase four-wire", and this line is the zero line at this time.

2. You directly use any of the three wires to supply power to the electrical appliance (that is, connect the neutral wire and the live wire), and the power supply voltage of the electrical appliance is 220V.

3. And the three-wire 380V three-phase electricity you are talking about, this voltage is actually the line voltage between A, B, and C three-phase electricity (that is, the voltage between any two lines of these three lines). Maybe then you will find a problem, that is, in the process of high voltage transmission, you only see three lines, and the neutral line is not connected to the power plant along with the high voltage line at all.

4. In fact, the zero line can be installed in the substation, because the zero line connected by the generator in the power plant, its potential (that is, the voltage reference position, usually considered to be zero voltage, which is also the origin of the zero line name, the same below) and the earth in the same potential, in this way, in the process of electric energy transmission, this zero line does not need to be connected with the high-voltage wire over the mountains and mountains.

5. Because you are thousands of kilometers away, and the potential value of the zero line on the side of the power plant is zero, then I can replace the zero line of the power plant by finding a ground wire with good communication with the earth in the substation thousands of kilometers away (this potential value voltage is zero), so that there is no need to lay a line that can be replaced.

It can't be connected directly.

When designing the power plug, in order to take into account the safety of the user, the grounding pin is consciously designed to be a few millimeters longer than the conductive pin, and the single-phase two-pin socket is connected with the phase wire at the right hole or upper hole facing the socket, and the left or lower hole is connected with the neutral wire. Single-phase three-pin socket, the right hole facing the socket is connected with the phase wire, and the left hole is connected with the neutral wire.

It is stipulated that three wires must be used to meet the requirements for electricity use, but if it is temporary electricity and the equipment has a ground wire directly into the ground for protection, the live wire in the two wires can be connected to the right hole terminal of the three-hole socket, and the neutral wire can be connected to the terminal of the left hole.

380V voltage precautions.

The voltage between either phase is 380VAC and the voltage at either relative neutral point is 220VAC. It is divided into phase A, phase B, and phase C. The line is represented by L1, L2, L3.

Three-phase alternating current has 660VAC and 6000VAC power supply due to different uses).

U, V, and W are called three phases, and the voltage between the phases is the line voltage, and the voltage is 380V. The voltage between the phase and the neutral point is called the phase voltage, and the voltage is 220V. The neutral wire is connected to the neutral point and is connected to any live wire to provide the current of the single-phase power supply.

It's not the same.

The three wires of 380V voltage cannot be directly connected for every two wires, and direct connection is equivalent to a short circuit.

Every two wires must be connected to a load, such as a resistive (e.g., heating device) load or an inductive (e.g., electric motor) load.

When connected to an inductor (such as a motor) load, in the case of power failure, use a tool such as a multimeter to measure, and the two wires are indeed connected.

Power? If the low-voltage end of the transformer (380V) is disconnected, in the case of no upper load, the two are disconnected, and in the case of load, the two may not be disconnected, because they can be connected by the load, of course, the disconnected load is equivalent to no load!! Thank you!

If it is measured with a load, it is normal to communicate with the load.

Use a multimeter to measure c w u c2 u2 w2 one by one and then connect it.

How is that possible? If the pass is short-circuited, it will collapse immediately! ~

Three-wire 380V three-phase electric connection zero line method: 1. The zero line can be installed in the substation, because the zero line is connected by the generator in the power plant. 2. Find a ground wire that is well connected with the earth to replace the neutral line of the power plant.

3. This grounding wire can be used as a neutral line to link. Using a three-phase generator as a power source, it is called a three-phase power supply; A circuit powered by a three-phase power supply is called a three-phase circuit; The phase voltage between the phase and the neutral wire is called the phase voltage, and the voltage is 220V.

What you are talking about can be connected to two is a two-phase device (in the power system, that is, an asymmetrical load); And must be connected to three, that is, three-phase balanced load motor (this kind of two-phase if connected, it is a lack of phase operation, the motor will be due to the existence of negative sequence current, quickly heat up and burn the winding, so it must be connected to three-phase).

The 380V motor is related to its own structure, and the commonly used drag motor is mostly three-phase balanced, which is the asynchronous motor commonly used in most of the machines. The 380V two-phase motor is mostly found in short-term operation maintenance equipment such as electric welding machines, and it can be connected to any two phases in the three-phase system.

380V three-wire electrical appliances use 380V three-phase electricity, such as three-phase motors.

Appliances with two wires of 380V voltage only use single-phase electricity with 380V voltage, such as high-power welding machines.

380V single-phase electricity is the "two phases" of three-phase electricity, but as long as one of the phases is removed, the three-phase electricity becomes "single-phase", not "two-phase", because it is impossible to appear "two-phase voltage waveform" in a single current circuit.

380V is the line voltage, that is, the voltage between the three phases (three wires), the sine wave, the angle difference of 120 degrees, it can generate a rotating magnetic field, improve the transmission efficiency, etc., the general motor, high-power equipment are used three-phase electricity (the actual three phase wires, a neutral wire, a ground wire, 5-wire system).

The phase voltage of 380V is 220V, that is, the voltage of each wire to zero (that is, the neutral point, generally grounded) is 220V, that is, the mains power of the household.

Generally, there are two wires, and there is usually a ground wire for safety.

The head of the phase in the three-phase load is connected with the tail of the other phase, and the load of this connection, the three phase currents, and the three line currents are all three-phase symmetrical currents with equal values and 120° phase differences, and the line current is equal to the phase current that is 3 times the root number. The root number of 220V is 3 times that is about 380V.

A, B, C three phases plus a neutral line, A, B, C three phases are three different live wires, the voltage between any two live wires is called line voltage (380V), and the voltage between a live wire and the neutral wire is called phase voltage (220V).

Summary. In a three-phase four-wire power system, the voltage between phase A and neutral is 220V, while the voltage between phase B, phase C and neutral is 380V, which is due to the symmetrical three-phase power supply in the three-phase power system. In a three-phase power system, the electric power** is divided into three phases, i.e., phase A, phase B, and phase C.

The voltage phase difference between these three phases is 120 degrees, which allows for higher power transfer efficiency and power load balancing. In a three-phase four-wire system, in addition to the three phases, there is also a neutral line used to provide single-phase power**, which is mainly used for low-power equipment and single-phase loads. Therefore, the voltage of phase A and neutral line is 220V, which is to meet the power supply demand of single-phase loads; The voltage between phase B, phase C and the neutral line is 380V, which is to meet the power supply needs of three-phase loads.

Such a design can better adapt to different types of loads and improve the efficiency and reliability of the power system.

In the three-phase four-wire, phase A and zero are 220V, and phase B and phase C and zero are 380V, what is the reason.

In the three-phase four-wire power system, the voltage between phase A and the neutral line is 220V, and the voltage between phase B, phase C and the neutral line is 380V, which is due to the symmetrical three-phase power supply mode used in the three-phase power system. In a three-phase power system, the power is divided into three phases, namely phase A, phase B and phase C. The voltage phase difference between these three phases is 120 degrees, which allows for higher power transfer efficiency and power load balancing.

In a three-phase four-wire system, in addition to the three phases, there is also a neutral line used to provide single-phase power**, which is mainly used for low-power equipment and single-phase loads. Therefore, the voltage of phase A and the neutral line of Yinmaoyou is 220V, which is to meet the power supply demand of single-phase loads; The voltage between phase B, phase C and the neutral line is 380V, which is to meet the power supply needs of three-phase loads. Such a design can better adapt to different types of loads and improve the efficiency and reliability of the power system.

Phase B, Phase C, and Phase Zero both require 220V, because 380V will burn electrical appliances.

In the three-phase four-wire system, the voltage between phase B, phase C and the neutral line is indeed 380V relative to phase A and the neutral line, rather than 220V. In a three-phase four-wire power system, the voltage between phase B, phase C and the neutral line is 380V, while the voltage between phase A and the neutral line is 220V. This is because in a three-phase power system, the voltage difference between each phase is 3 times the root number, i.e. 220V multiplied by root number 3 to get 380V.

Typically, electrical equipment should be able to adapt to the system's voltage to prevent the appliance from being burned out. If your appliance can only withstand 220v, then applying 380v to that appliance may cause damage. Before using electrical appliances, please be sure to carefully read the specifications and labels of electrical equipment to ensure that it is suitable for the voltage provided.

If in doubt, please consult a professional electrician or relevant authority for quasi-or accurate guidance and guidance.