What is the definition of each pin of a three phase four wire plug?

It's a little difficult, there's no foundation at all, it's hard to talk about it, just say a few words:

Three-phase four-wire power supply is that there are 3 live wires, one N wire, and the voltage of N line to ground is basically zero, so we also call N line zero line, and the zero line has no power and will not be electrified.

3 live wires (according to the voltage of 380V), as the name suggests, the live wire has electricity, and the voltage between the neutral wire is the same as 220V.

The voltage between the 3 live wires (according to the voltage of 380V) is 380V.

You can understand the relationship of equilateral triangles: the point where the three angular bisectors intersect is the zero line, the three vertices represent the three phases a, b, and c, the distance between the three vertices and the center of the zero line is 220V, and the distance between the three vertices is 380V.

It is not possible to understand the ...... of how much V A and how much V B isIt has to be compared to a certain potential to know what the voltage is, for example, how far away is the unit? You need to know the distance from **.

The wrong phase sequence of the three-phase electricity will cause all the electrical systems that have requirements for the phase sequence to fail and work abnormally; On the contrary, if there is no requirement for phase order, there is no impact.

If the three-phase electrical connection is short-circuited, it will ignite, catch fire, trip, burn out the power supply equipment, etc., and that is an accident.

As long as the three-phase electricity is connected according to the corresponding connection, the distribution box is sorted by yellow, green and red, represented by U V W, any one of the three zero lines is 220V, and any two of the three are connected to 380V, if the order is wrong, the equipment may not be used normally, and there will generally be a drawing of it, marked L1, L2, L3

For the method of wiring the four wires, please take a closer look at the following figure:

Wiring diagram of three-phase four-wire plug.

Please take a closer look at the picture!

The neutral line is connected to the top and largest contact. For the other three lines of fire, just pick up the remaining three contacts at will!

It should be noted that the size of the plug and wire diameter must meet the load requirements! Don't mix and match at will!

1. First of all, prepare the meter, wire, electrician's pliers, and electrical tape. 2. When the three-phase alternator supplies power to the outside, connect the ends of the three groups of coils X, Y and Z together, and draw a line from the connection point, which is called the neutral line and also the neutral line. Then draw a wire from the other end of the coil winding, A, B, and C.

In this way, a three-phase four-wire system (three live wires, one neutral wire) is formed, and this connection method is called the star connection method. 3. After each part is connected, wrap the tight joint with adhesive tape to prevent electric shock accidents. It needs to be operated in the event of a power failure, and should not be operated by non-electrician professionals.

The three-phase plug has four terminals, the upper one is connected to the neutral wire, and the left and right and lower terminals are connected to the three-phase live wire.

Four wires, that is, 3 live wires, one neutral wire, the zero wire is not connected, and the plug is connected to 3 live wires.

The zero line of the mark n, the other three ends can be connected casually, and if the load is a point machine, the two live wires can be dropped at will if it is reversed.

The four wires of the three-phase four-wire system are A, B, C, NThe rest of the one is not ground. It's the zero line.

A, B, and C are connected to any one, and adding N is a single item of 220. The ground wire can be connected by yourself, and the ground is on the line. There is no direction for a single item of electricity, and it can be used as a loop, but the ground wire cannot be connected incorrectly.

The 10 thousand volt high-voltage input from the substation is used to step down the voltage to the transformer to 380V voltage, divided into yellow, green and red phase three lines, and there is a neutral wire from the transformer, which is called the zero line, and the composition of the four lines is a three-phase four-wire system, which is given to factories, schools, hospitals, and civil by the three-phase four-wire.

The four wires of the three-phase four-wire system are A, B, C, N, that is, the three phase wires of three-phase electricity (also known as power electricity, 380V) A, B, C three-phase (corresponding to the U, V, W of the electrical coil) plus a neutral line N, and its wiring can be shown in the figure

The three-phase socket comprises a base and a metal contact with a terminal fixed thereon and a casing that opens a jack corresponding to each contact, is characterized in that it is provided with two insertion seats, the corresponding contacts of the base are connected by conductive sheets to form a kind of two complementary insertion seats, and an isolation plate is arranged between each jack on the inner side of the housing.

When the three-phase plug is inserted into one plug-in seat, and the phase sequence is found to be inconsistent, the other plug-in seat is inserted, and the phase sequence can be matched, without opening the plug or equipment to turn the line. It has the advantages of convertible plug phase sequence, flexible and convenient use, arc isolation, rainproof and dustproof, safe and reliable use.

Live and neutral wire:

There are two wires in the lighting circuit, one is called the live wire, and the other is called the neutral wire. The difference between the live wire and the neutral wire is that they have different voltages to the ground: the voltage to the ground of the live wire is equal to 220V; The voltage of the neutral line to the ground is equal to zero (which itself is connected to the earth).

Therefore, when one part of the person touches the line of fire and the other part stands on the ground, and the voltage between these two parts of the person is equal to 220V, there is a risk of electric shock. On the other hand, even if a person uses his hand to grasp the zero line, if the person is standing on the ground, because the voltage of the neutral line is equal to zero, the voltage between the various parts of the person's body is equal to zero, and the person is not in danger of electric shock.

If the live wire and the neutral wire once touched, because the voltage between the two is equal to 220 volts, and the resistance between the two contact points is almost equal to zero, the current is not coincidentally large, and a huge amount of heat will be generated at the contact point of the live wire and the neutral wire, resulting in an electric spark, and the temperature at the spark is high enough to burn the metal wire to melt. <>