There are two wiring methods for three phase alternating current

Three-phase electricity has two connections: star and triangle at the power supply end and the load side. Both connections will have three three-phase transmission lines and three power supplies (or loads), but the power (or loads) will be connected in different ways.

The voltage in the three-phase four-wire system in the daily power system is 380 220V, that is, the phase voltage is 380V, and the phase voltage varies with the wiring method; If the star connection is used, the line voltage is 220 V, and the phase voltage of the triangle connection is 380 V. The star connection of a three-phase motor is to connect one end of each phase power supply or load to one point, and the other end of them is used as a lead-out wire, which is the three phase wires of three-phase electricity. For the star connection, the midpoint (called the neutral point) can be drawn out as a neutral line, forming a three-phase four-wire system.

It can also be drawn out without drawing out to form a three-phase three-wire system. Of course, with or without a neutral wire, you can add a ground wire to become a three-phase five-wire system or a three-phase four-wire system, respectively.

When the three-phase load is balanced, no current flows through the neutral wire. When the three-phase load is unbalanced, the neutral wire should be connected, otherwise the load of each phase will be unequal.

The three-phase alternating current used in the industry, some directly from the three-phase alternator, but most of them still come from the three-phase transformer, for the load, they are all three-phase AC power supply, and the three-phase four-wire system is mostly used when the power supply is low.

In the three-phase four-wire power supply, the three coils of the three-phase AC power supply adopt the star (Y-shaped) connection, that is, the ends of the three coils X, Y, and Z are connected together to become the common point of the three coils, which is usually called the midpoint or zero point, and is represented by the letter O.

When supplying electricity, four wires are drawn: the conductor drawn from the midpoint O is called the middle line (neutral line), and the residential power supply is called the neutral line; The three wires that lead from the ends of the three coils are called A, B, and C, and are collectively referred to as phase wires or live wires. In star wiring, if the midpoint is connected to the earth, the midline is also called the ground wire, also called the repeated ground.

The four wires drawn out of our common three-phase four-wire power supply equipment are three live wires and one ground wire.

China's low-voltage power supply standard is 50Hz, 380 220V, while Japan and some countries in Western Europe use 60Hz, 110V power supply standards, special attention should be paid to the use of imported electrical equipment, the voltage level does not match, will cause damage to electrical equipment. The triangle connection of the three-phase motor is to connect the power supply or load of each phase end to end in turn, and lead out each connected point as the three phase wires of the three-phase electricity. The triangular connection has no neutral point and cannot lead to a neutral line, so there is only a three-phase three-wire system.

When the ground wire is added, it becomes a three-phase four-wire system.

Hello dear! What are the connection methods of three-phase AC power supply? The two wiring methods of three-phase alternating current are the mega connection and the triangle connection.

1. Star connection: the middle line is led by 3 ends together, and 3 live wires are led by 3 head ends. The positive polarity terminals A, B, and C of each phase voltage source are drawn out in order to be connected to the load, which is the star connection mode, or the Y-shaped connection mode; 2. Triangular connection:

In the three-phase circuit, the symmetrical three-phase voltage source is connected in turn, the negative polarity end of the phase-ahead voltage source and the positive polarity end of the phase lag voltage source are separated and leased, the three-phase voltage source forms a loop, and then the end line is drawn from the three connection points, which is the triangle connection mode.

Pro, 380V connection: W2, U2, V2 three wire posts are connected in pairs, and the three connected live wires can be connected with U1, V1, and W1 respectively. The power supply lines include three-phase three-wire, three-phase four-wire, three-phase five-wire, etc.

The first type usually only supplies power to three-phase motors. The second type is the most commonly used, adding a zero line. In the third category, a special protective ground wire is added.

The voltage between the phases is 380V, and the voltage between the phases is 220V. Household electricity is called single-phase electricity with a phase line and a neutral line. The electric welding machine generally uses two phase wires, which is called two-phase electricity.

For the convenience of users, a small number of welding machines are designed for dual use, which can be used in single phase or two-phase, but the connection method is different. There should be a mark on the pile head. Your welder clearly falls into this category.

Any two phases can be connected to the 380V pile head. The 220V pile head is used in places where there is no three-phase power supply, connecting one phase and one zero.

Hello, I am glad to answer for you what are the wiring methods of three-phase electricity, three-phase electricity has two connections: star and triangle at the power supply end or transformer and load end. 1. Star connection. The star connection method of three-phase electricity is to connect one end of each phase power supply or load to one point, and the other end of them is used as a lead-out wire, which is the three phase wires of three-phase electricity.

The star connection method can lead out the midpoint as a neutral line to form a three-phase four-wire system. or not to draw out, constituting a three-phase three-wire system. Regardless of whether there is a neutral accompanying wire or not, a ground wire can be added to become a three-phase five-wire system or a three-phase four-wire system, respectively.

In the three-phase electricity of the star connection, the line voltage is several times that of the phase voltage, and the line current is equivalent to the phase current. When a three-phase load is balanced, even if a neutral wire is connected, there is no current flow on it. When the three-phase load is unbalanced, it is necessary to connect the neutral wire to avoid the unequal voltage division of the load of each phase.

2. Triangular jointing. The triangular connection method of three-phase electricity is to connect each phase power supply or load in turn, and at the same time lead out each connected point to use the three phase wires of three-phase electricity. The triangle connection method does not have a neutral point and cannot lead to a neutral line, so there is only a three-phase three-wire system.

After adding the ground wire, a three-phase four-wire system can be formed.

The two types of wiring methods for three-phase alternating current are star connection and triangle connection.

Star connection: The middle line is led by the 3 ends connected together, and the 3 live wires are led by the 3 first imitation of this remaining end. The positive polarity terminals A, B, and C of each phase voltage source are drawn out in order to be connected to the load, which is the star connection mode, or the Y-shaped connection mode;

Triangle connection: In the three-phase circuit, the symmetrical three-phase voltage source is connected in turn, the negative polarity end of the phase-ahead voltage source is connected to the positive polarity end of the phase lag voltage source, the three-phase voltage source forms a loop, and then the end line is drawn from the three connection points, which is the triangle connection mode.

The three wires that lead out from the 3 ends of the power supply are called end wires. The voltage between any two end wires is known as the line voltage. When the star is connected, the line voltage is 3 times the root number of the phase voltage, and the phase difference between the three line voltages is still 120 degrees, which is 30 degrees ahead of each of the three phase voltages.

The star connection has a common point, called the neutral point. When the line voltage is equal to the phase voltage when the triangle is connected to the standby roll, the three power supplies form a loop, and only when the three-phase power supply is symmetrical and connected correctly, there is no circulation inside the power supply.