What is the phase voltage and line voltage of a motor

Phase voltage and line voltage:

1. In the three-phase generator star connection method, the ends of the three windings are connected together to form a common end-neutral-neutral line. The transmission line connected to the three winding starts forms a phase wire, also called a live wire. The voltage between the (live wire) and the neutral wire is called the phase voltage u1.

2. The voltage between the outlet end of the three-symmetrical power supply (phase line) and the neutral line (green dotted line) is called the phase voltage. The voltage between the phase wires is called the line voltage.

What is line voltage and phase voltage For a three-phase four-wire power grid, the voltage between any two of the three phase wires is called the line voltage, and the voltage between the phase line and the neutral line of any one is called the phase voltage, the phase difference of the three-phase voltage is 120 degrees, and the line voltage is the vector sum of the phase voltages of the two phases. The relationship between the line voltage and the phase voltage: Line voltage = phase voltage 3 times the root number.

Line voltage: The voltage between the phase wires and the phase wires, for example, the voltage between the three phases A, B, and C, the voltage between phase A and phase B, the voltage between phase A and phase C, and the voltage between phase B and phase C are the line voltage. That's what we say in our daily work"Phase-to-phase voltagePhase voltage

Refers to the voltage at both ends of each phase of a three-phase power supply or a three-phase load.

In general: the three-phase power supply is represented by yellow, green and red wires, the neutral wire is usually represented by the blue wire, and the ground wire is usually represented by the yellow and green two-color wires, which is the basic common sense of the wire and power supply.

Three-phase four-wire system.

In the power supply network, the voltage between the live wire and the neutral line of each phase is the phase voltage. For example, in a three-phase four-wire system with daily low-voltage power supply, the line voltage is 380V and the phase voltage is 220V.

The line voltage is equal to three times the phase voltage of the root number. 380v=√3×220v。For the load, when the load is triangular connection, the line voltage is equal to the phase voltage.

When the load is made a star connection, the line voltage is equal to three times the phase voltage of the root number.

The difference between phase voltage and line voltage is as follows:First, the voltage is different.

1. Line voltage refers to the voltage between two lines in a multi-phase power supply system, and for three-phase electricity, it is the interphase voltage of the three-phase lead-out line.

The voltage between any two live wires is 380V.

2. The phase voltage refers to the voltage between any phase (live wire) and the neutral wire, which is 220V, that is, the voltage between a live wire and the neutral line mentioned by the subject. Although the three-phase voltage.

The voltage between either phase (live wire) and neutral line is 220V.

Second, the composition structure is different.

1. The phase voltage is the voltage at both ends of each phase winding, that is, the voltage between the live wire and the neutral line.

2. The line voltage is the voltage between any two live wires on the line.

Third, the connection method is different.

1. Triangle.

The wiring and the star wiring that do not lead out of the neutral point have three end wires that are three-phase three-phase system, three live wires, 380V, and line voltage.

2. The star wiring that leads out the neutral wire counts the three live wires, and there are a total of four power lines, three-phase four-wire system.

One fire, one zero, 220V phase voltage.

Voltage is different:Phase voltage: the voltage of any live wire and neutral wire, 220V.

Line voltage: The voltage between any two live wires, known as line voltage, 380V.

About voltage:Voltage, also known as potential difference or potential difference, is a physical quantity that measures the difference in energy between a unit charge in an electrostatic field due to different potentials.

The magnitude of the voltage from one point to another is equal to the work done by the unit positive charge to move from one point to another due to the action of the electric field force, and the direction of the voltage is specified as the direction from the high potential to the low potential.

Electrician Knowledge: What is Line Voltage? What is Phase Voltage? What's the difference? How to distinguish.

Electrician Basics: What is Single-Phase Electricity? Three-phase electricity? Line voltagePhase voltageThe old electrician will teach you step by step, practical electrician technology!

The voltage at both ends of each phase coil is called the phase voltage. It is usually expressed by UA, UB, and UC, respectively. The voltage between the end wires and the end wires is called the line voltage. It is generally expressed by UAB, UBC, UCA.

Take three-phase sinusoidal alternating current as an example: It is applicable to both generators (power supply) and motors Line voltage refers to the voltage between the two-phase power lines;Phase voltage refers to the voltage experienced by each phase winding;

There are two ways to connect the winding: star connection and triangle connection;

So from the above definitions of line voltage and phase voltage, the following conclusions can be drawn:

Star connection: line voltage = phase voltage 3 times the root number (because the phase difference of sinusoidal three-phase alternating current is 120 degrees to each other);

Delta connection: phase voltage = line voltage.

1. Line voltage (line voltage) is the voltage between the two lines of the multi-phase power supply system, taking the three-phase as an example, the three-phase lead lines of A, B and C are also known as the line voltage. The magnitude of the line voltage of the star connection is 3 times the root number of the phase voltage. The phase voltage of a delta power supply is equal to the line voltage.

2. The voltage between any phase wire and the neutral line in the three live wires is called phase voltage UA, UB, UC, and the voltage between the three phase wires and the neutral wire is 220 volts in China's low-voltage power supply system.

The voltage between the three phase wires is called the line voltage. In a symmetrical three-phase system, the magnitude of the line voltage is a multiple of the phase voltage. In China's low-voltage power supply system, the line voltage is 380 volts.

For alternating current, the phase voltage is the voltage between either phase line (live wire) and the neutral line, which is 220V. Three-phase alternating current has three phase voltages: the voltage of the three is the same, the frequency is the same, and the phase difference between them is 120°.

The voltage between any two phase wires, known as the line voltage, is 380V. Three-phase alternating current has three phase voltages, so there are also three line voltages: the voltage and frequency of the three line voltages are the same, and the phase difference between them is 120°.

Line voltage (3) phase voltage for the three-phase four-wire power grid, the voltage between any two of the three phase wires is called the line voltage, the voltage between the phase line and the neutral line of any one is called the phase voltage, the phase difference of the three-phase voltage is 120 degrees, the line voltage is the vector sum of the phase voltage of the two phases, and the relationship between the line voltage and the phase voltage is: line voltage = phase voltage of 3 times the root number. For mains, the phase voltage is 220V, and the line voltage is 3 times the root number of 220V, that is, 380V

Line voltage is the voltage between two lines of a multi-phase power supply system, taking three-phase as an example, the voltage between the three-phase lead lines of A, B and C is also known as line voltage.

The voltage between any phase wire and the neutral wire in the three live wires is called the phase voltage UA, UB, UC. In the low-voltage power supply system, the voltage between each of the three phase wires and the neutral wire is 220 volts.

The voltage between the three phase wires is called the line voltage. In a symmetrical three-phase system, the magnitude of the line voltage is a multiple of the phase voltage. In a low-voltage power supply system, the line voltage is 380 volts.

In the three-phase generator star connection, the ends of the three windings are connected together to form a common end - neutral - neutral wire. The transmission line connected to the three winding starts forms a phase wire, also called a live wire. The voltage between the (live wire) and the neutral wire is called the phase voltage u1.

The phase voltage is the voltage between any phase wire and the neutral wire in the three live wires; Line voltage is the voltage between the three phase wires.

The relationship between the line voltage and the phase voltage of the three-phase power supply is (taking the power supply side as an example):

1) For the triangle wiring, the line voltage is equal to the corresponding phase voltage;

2) For star wiring, the relationship between the line voltage and the phase voltage is UAB=UAN-UBN, UBC=UBN-UCN and UCA=UCN-UAN

If the phase voltage of the three-phase power supply is a positive sequence (negative sequence) symmetry group, then the three-phase line voltage is also a positive sequence (negative sequence) symmetry group. This pair of delta power (or delta load) is self-evident.

In a symmetrical three-phase circuit, whether it is a three-phase power supply or a three-phase load, there is UL=UP in the triangle connection, and UL and UP are the effective values of line voltage and phase voltage, respectively.

1. Line voltage.

Line voltage) is the voltage between the two lines of the multi-phase power supply system, taking the three-phase as an example, the three-phase lead lines of A, B, and C are the voltages between each other, and they are also known as line voltages. The magnitude of the line voltage of the star connection is the phase voltage.

3 times the root number. Triangle.

The phase voltage of the power supply is equal to the line voltage. Brother Tachibana Zheng.

2. Any phase wire in the three live wires.

The voltage between the neutral line is called the phase voltage UA, UB, UC, and in China's low-voltage power supply system, the voltage between the three phase wires and the neutral line is 220 volts.

The voltage between the three phase wires is called the line voltage. In a symmetrical three-phase system, the magnitude of the line voltage is a multiple of the phase voltage. In China's low-voltage power supply system, the line voltage is 380 volts.