What is the neutral point in the circuit?

There is a point in the windings of the transformer and generator, and this point is the absolute value of the voltage between each external terminal.

equal, this point is the neutral point.

When the power side (transformer or generator) or load side is star-wired, the common contact of the first (or tail) end of the three-phase coil is called the neutral point, referred to as the midpoint.

A common point that occurs when a three-phase power supply or three-phase load is connected to a star. When the neutral point n of the three-phase star-connected load is connected with the center line of the power supply system, the potential of the neutral point n is basically the same as the potential of the neutral point n of the power supply because it is directly constrained by the power supply.

However, if the neutral point n of the three-phase star-connected load is not connected to the center line of the power supply system, the so-called neutral displacement phenomenon will occur if the load is asymmetrical. The neutral point displacement means that the neutral point n and the neutral point n no longer coincide on the position chart, which actually indicates that the potentials of the two are different and electricity occurs (the potential of the neutral point n is zero).

In a star-connected three-phase circuit, the point at which its three coils (or windings) are connected together is called the neutral point. The wire leading from the neutral point is called the neutral wire. The neutral point of the power system refers to the connection symmetry point and voltage balance point of each phase of the power equipment (such as generators, transformers, etc.) with star connections in the windings or coils of the three-phase power system, and its ground potential is zero or close to zero during the normal operation of the power system.

The neutral point grounding in the power system is a kind of working grounding, which ensures that the power equipment and the entire power system have appropriate operating conditions under normal and fault conditions.

In general household electricity, or in the three-phase electricity of factories. Generally, 3 identical independent AC power sources are connected in parallel, and then connected to the load, for example, in these 3 AC power sources, a wire is drawn out and the other 3 loads are connected in series. Then the 3 points on the side near the power supply are called neutral points, and the electric potential of this neutral point is 0

The 3 points close to the side of these 3 loads are also called the neutral point, and the potential of the neutral point is also 0 when the load is the sameIn household electricity, the load is different in each home, and if it is still connected in this way, it will lead to uneven voltage distribution in each home. Therefore, the neutral point of the power supply and the neutral point of the load are generally connected together in the circuit, and this wire is called the neutral line.

In this way, the voltage can be the same for each house. In the case of a three-phase electric star connection, the above is a three-phase electric star. There is also the case of the connection of triangles.

When doing oscilloscope debugging and maintenance, it is often called the working reference point, which is the grounding point.

That's where the voltage is zero.

The neutral point refers to the three-phase coil on the low-voltage side of the transformer to form a star-shaped connection, and the connection point is called the neutral point, and because its point is zero potential, it is also called the zero line end, and the general zero line is drawn from this point. After the neutral point is grounded, all the equipment grounding protection lines covered by the power grid can be set as the ground wire nearby, and once there is leakage, it can be transferred to the neutral point of the transformer through the earth conduction circuit to ensure safety.

It refers to three live wires from the three-phase transformer, a neutral wire, also called the n-line, which is the end of the three-phase live wire and also called the neutral point. The neutral point is not grounded, which means that the n line should not be connected to the equipment shell and the ground under your feet.

It refers to the three-phase coil on the low-voltage side of the transformer to form a star-shaped connection, and the connection point is called the neutral point, and because its point is zero potential, it is also called the zero line end, and the general zero line is drawn from this point.

Theoretically, when the three-phase load is balanced, the neutral point of the transformer and generator has no voltage.

In fact, it is difficult to achieve absolute balance at the neutral point of transformers and generators, so it is difficult to balance the neutral point of transformers and generators, so there will be a certain voltage at the neutral point.

The three-phase load of generators and large transformers is relatively well balanced and the voltage at the neutral point is also very small because of the large adjustment range. Because of the single-phase load of the civil distribution transformer, the unbalance is relatively large, and the neutral point will produce a high voltage, and for safety, the neutral point of the distribution transformer is required to be grounded.

The neutral point is the zero line of the star connection, which alone has no voltage for the earth, and many transformers have been used on the zero ground (the zero line has been grounded), and we generally say that the voltage of the phase line (3 with the live wire) is 220V; There is also a kind of transformer that is not used in the ground zero, and there may be a certain voltage to the ground wire in the case of leakage of the point equipment.

1 The absolute value of the voltage here is to say that the potential at this point is assumed to be zero, and the potential difference between this point and the other external terminals is the same.

2 In a system where the center point is directly grounded, there is no voltage at the center point, because in either case, the center point is fixed at zero potential by the earth. If the center point is not grounded system, when the current imbalance of the three-phase circuit occurs, and when there is a single-phase ground fault, the voltage will appear from the center point to the ground.

Basically, there is no electricity (power cannot be output), but the actual measurement with a meter (especially the digital meter because of the large internal resistance) will have a certain voltage, because there is a distributed capacitance between the entire transformer and the ground to form a loop. In layman's terms, it is virtual electricity.

Theoretically, it is 0 potential; It is equal to the ground potential, but it is only a reference, a setting.

Hello: Three-phase circuitStar connections], the three-phase load [Connected togetherThe point is called [Neutral point

In layman's terms, the neutral point is the n-line. In terms of generators, when the coil is connected in a star shape, the three coil Minkai connection points are the neutral points;

The voltage of the neutral point to the phase line is 220V, and the bridge bond between the phases is 380V.

When the TN-S system supplies power, the neutral point of the low voltage end of the transformer is reliably grounded, which is called working grounding. PE wire is repeatedly grounded. This is called protective grounding.

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The neutral point is grounded by resistance, that is, the resistance with a certain resistance value is connected between the neutral point and the earth. The resistor and the system to the ground capacitor form a parallel circuit, because the resistor is an energy-dissipating element, but also a capacitor charge release element and a resonant voltage blocking element, to prevent resonant overvoltage and intermittent arc grounding overvoltage, has certain advantages. There are three ways to ground the neutral point through resistance: high resistance grounding, medium resistance grounding, and low resistance grounding.