What is the difference between three phase electricity and two phase electricity and live wire neutr

1. Three-phase electricity.

It refers to three phase wires (or live wires), which are generally divided into three phases: A, B and C, and the phase voltage.

is 220V, line voltage.

is 380V, each phase voltage is the same but the phase difference is 120 degrees.

2. Two phases refer to any two phase wires with a voltage of 380V.

3. Single-phase refers to taking any one of the phase wires and one neutral wire, with a voltage of 220V.

4. The neutral line generally refers to the neutral point of the direct grounding of the transformer (or generator), because it is directly connected to the earth, so it is generally believed that the potential (voltage) between the neutral line and the ground is 0. The neutral line is divided into working neutral line and protection neutral line, the working neutral line is in a single-phase 220V system (such as household appliances), and the current it carries is the same as the phase line. The protection neutral line is to protect the shell of the electrical appliance with zero connection to protect personal safety when the electrical appliance leaks (for example, the motor shell in the three-phase 380V system has zero connection protection).

5. In fact, many systems in the electrical room are connected together, but they are led out by a separate wire, which is generally used for grounding protection of special electrical shells, and is not allowed to carry working current. No switches or fuses are allowed to protect the neutral or ground wires.

Three-phase electricity refers to three live wires, each of which is just different in phase.

Two phases refer to two of the wires, some lights, the welder is to take two different phase wires connected at both ends.

Single-phase refers to taking one of the live wires to connect one end of the lamp and the other end to the neutral wire. The same goes for other loads.

The live wire is connected by the generator of the power plant, which is to send electricity from the power plant to your home.

The neutral line is generally said to be a wire that is connected from the neutral point of the transformer and buried in the ground at the same time. Because it's buried in the ground at the end of the transformer, if you touch the light when it's on, it won't be electrical, but it's best not to touch it. What if?

Some of the ground wires are connected from the ground buried with a piece of iron, and some are buried with the zero wire on the transformer side, and pull the root wire to your home like the zero wire, but the zero wire is to participate in the use of electricity, and the ground wire is only used to connect the equipment shell.

Electricity is a system, and the more you know, the better you understand the questions you ask. If you understand it, look at the basics of electricians, and others can't pass it on to you in words. In particular, the phase involves a sinusoidal function, and if you understand this mathematical problem, you will have a deeper understanding of electricity, and you will not be like some electricians.

The electricity emitted by the power plant will not let you use it, the electricity you use is the transformer transformer, the three windings of the transformer out of the three wires are three live wires, the other end of the three windings is connected together, and then lead out, that is the zero line, in the periphery of the transformer, will bury a ground pile in the ground, that is the ground wire, generally the transformer zero line and this ground together, so that people contact the zero line will not be electrocuted, if the connection with the ground is broken, the zero line will be charged relative to the earth is not the same potentialIf a live wire is grounded, the grounding should be good, it should be bright, this I have not tried.

With a multimeter, you can distinguish between phase line and zero line. The ground wire is generally identified by the color (yellow-green) of the wire.

Use a multimeter to measure the voltage between the lines, if the voltage is 380V, it is two phase wires. If the voltage is 220V, it is a phase wire and a neutral wire. Then use the electric tester to distinguish the phase line, and the other one is the zero line.

FireWire function: power supply. Neutral line function: auxiliary composition loop.

The function of the ground wire: to prevent the electric damage to the operator after leakage, the ground wire can not be mixed into the zero line, and the ground can also be mixed in some special occasions.

In general, red is the live wire, blue is the neutral wire, and black is the ground wire.

Precautions(Receiving a call):

1. Prevent electric shock and short circuit;

Second, it is necessary to pay attention to the switch to control the live wire;

3. It is better not to connect the fuse on the zero line;

Fourth, the center of the lampholder is connected to the fire wire;

5. Do not mix the grounding wire and the neutral wire;

Sixth, the electrical appliances are cut off from the fire wire, so that the electrical appliances will not be electrocuted, and if the zero line is broken, the people will be electrocuted if they touch the electrical appliances.

1. Distinguish according to the color, provided that the wires are wired in accordance with the standard requirements, and there are a total of 5 wires for residential electricity. The fire wire is any yellow, green, or red, the zero wire is light blue, and the ground wire is yellow-green.

2. Use an electric pen to distinguish the live wire and the neutral wire, and use the electric detector pen to contact the core of the three wires respectively, the indicator light is the live wire, and the indicator light is not the zero line or ground wire.

In the three-phase four-wire circuit, there are three live wires (phase wires) and a neutral wire, in which the voltage of any phase wire and the neutral wire is 220 volts, and the voltage of the phase wire and the phase wire is 380 volts.

Answer: The three lines to distinguish the ground fire zero line are generally distinguished according to the color, the fire line is any one of yellow, green, and red, the zero line is light blue, and the ground wire is yellow and green, of course, you can also distinguish the fire line and the zero line by an electric pen. Or use the bulb to distinguish, you need to prepare a test bulb first, with two of the three wires respectively connected to the bulb, the bulb is normally lit is the live wire and the neutral wire, the bulb is slightly bright is the live wire and the ground wire, the bulb is not lit at all is the zero line and the ground wire.

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Because the information provided is three-phase four-wire, the ABC three-phase is identified with a phase sequence detector, and the remaining one is the zero line. If there is no phase sequence detector, then it is possible to determine the live line by measuring it with an electric pen, but not the phase sequence. It is also possible to determine the live line and the neutral line with a multimeter, and the phase sequence cannot be determined either.

The functions of the three wires of the fire wire, the zero wire, and the ground wire are as follows:

1. Fireline (L).

It is relative to the zero line, the general household electricity will only use one of the three phases of electricity, his line voltage is 220 volts, it is through the zero line to form a circuit to make the household appliances work.

2. Neutral line (n).

It is mainly used in the working circuit, which leads out the main line after grounding from the neutral point of the transformer. In three-phase electricity, the neutral wire can be one size smaller than the live wire. However, in single-phase electricity, the neutral line is used as a loop, and the live wire and the neutral wire must be of the same specification.

3. Grounding wire (PE).

It is not used for working circuits, only as protective wires. Using the absolute "0" voltage of the earth, when the leakage of electricity occurs in the device housing, the current will quickly flow into the earth. According to the national standard, the grounding wire must be made of bare copper soft wire above the square.

The grounding wire is a line that directly connects to the earth, which can also be called a safety route, and when it is dangerous, it directly transfers the high voltage to the earth, which is a lifeline. Grounding wires are an important tool to keep workers safe in the event of an unexpected voltage on equipment and lines that have been cut off.

The difference between the zero line of the live line.

Both the live wire and the neutral wire are live wires, and when we touch the neutral wire on the ground, because there is no difference in potential, there will be no current. Both the neutral wire and the live wire are originally from the power supply, and the positive direction of the current is from one outlet through the external device and from the other end to form a loop. The difference between the neutral wire and the live wire is that one of the two terminals of the power supply is connected to the ground.

The connection between the fire line and the Jizen line indicates that there is a short circuit in some places. Between the live wire and the ground wire, there must be an electrical device. The function of electrical devices is to consume electric energy, and at the same time improve the impedance of the loss of supply, so as to prevent the circuit current from exceeding the limit and causing a short circuit.

Therefore, the direct connection between the live wire and the ground wire will lead to a short circuit and tripping, and even the equipment will be burned. As for the specific short circuit, you need to check the circuit to determine.

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The live wire, neutral wire, and ground wire are the three wires that are commonly found in circuits. They each have different roles, which are as follows:1

Firewire: Also known as phase wire or **, it is called "firewire" because it usually carries a large amount of electrical energy. FireWire is responsible for bringing alternating current from the power supply into the circuit and is the current source in the circuit.

2.Neutral wire: also known as neutral wire, its function is to stabilize the voltage in the circuit within a certain range, to ensure that the forward and reverse currents can be balanced, in the circuit to play the role of a current loop, and is usually used for grounding protection.

The neutral wire is used to return the current and provides a loop for the circuit. 3.Ground:

Also known as protective wire, it is usually grounded. It mainly plays the role of grounding the electrical shell and protecting the human body from the danger of electric shock. If the electrical appliance leaks, people are susceptible to the risk of electric shock when they are not grounded, and the leakage current is shunted to the ground after grounding, which reduces the risk of electric shock.

In addition:1Difference Between Neutral and Ground:

Both the neutral and ground wires are part of the circuit in a circuit, but they serve different purposes. The neutral wire is usually used to transmit electrical energy in a current loop, while the ground wire is mainly used to protect the human body from the danger of electric shock. Neutral and ground wires should not be used confusingly.

2.In the circuits of some countries and regions such as Europe and Australia, the ground wire and the neutral wire are usually combined together in Zen Hao, called the PEN line or N line, although the name is different, but its function and principle are consistent with the domestic zero line and ground wire. 3.

In the home circuit, the live wire and the neutral wire are the basic lines that form the electrical switches, and the use of the live wire and the neutral wire need to pay attention to insulation and protection measures, so that the people living and using electrical appliances around will not be exposed to the danger of electric shock. 4.For the heating, baking, drying, shrinking and other operations of dangerous goods, the corresponding electric heating equipment needs to be used, while for occasions such as industrial drying, tempering and annealing, it may be necessary to use higher power heating devices, so more protection and maintenance are required.