What are the causes of reverse metering caused by welding machines?

In this case, it is likely that the transformer or inverter is broken, and the transformer in it must be replaced, only then can it.

As for the reason for the reverse measurement of the welding machine you asked, it should be said that during the welding process, its counter failed accordingly, so there was a reverse measurement.

Yes. The three-phase electric energy meter has positive and negative two-way metering, which is generally used for mutual transmission of metering electricity at the gate. Electricity meter is the abbreviation of electric energy meter.

The electric energy meter is an instrument used to measure electric energy, also known as the watt-hour meter, fire meter, kilowatt-hour meter, which refers to the instrument for measuring various electrical quantities, commonly known as the watt-hour meter and fire meter. By Use: Industrial and Civil Meters, Electronic Standard Meters, Maximum Demand Meters, Complex Rate Tables by Structure and Working Principle:

Inductive (mechanical), static (electronic), electromechanical (hybrid) according to the nature of the access power supply: AC meter, DC meter according to the accuracy level: commonly used ordinary meter:

and other standard tables5. According to the installation and wiring mode: direct access type, indirect access type according to the electrical equipment:

Single-phase, three-phase three-wire, three-phase four-wire energy meter.

The reason for the reverse measurement of the welding machine is that you may make the wrong adjustment when adjusting the welding current, so it is said to be reversed, and if it is reversed, the welding machine will have problems.

What is the cause of the gas volume in the opposite direction? If it's the other way around, it's possible that he's used it too much, which is very dangerous.

The reason for the reverse metering, the most important thing is that there is no correct installation, and it may be a mistake to install the front and back.

In this case, it is very likely that the inverter in the welding machine is broken, and the inverter must be replaced, only in this case.

If it causes reverse metering, it proves that it is running in reverse, so it is reversed in terms of measurement.

What is the return to you that you want to improve into reverse metering? I think the reason why I also mentioned forward and negative measurement is because he can't bear this energy anymore, he can't be there anymore.

The reason why Zhao Cheng returned to his hometown base station in the off-season was because the current was too strong.

The user's large welding machine generates reverse power, and the reverse power can be exported with wires.

It is mainly caused by the principle of imputation.

What are the reasons for anti-design? He just wants to see the situation, but how much is this welding?

The reason for the reverse design of the welding machine is caused by the problem of the design drawings inside.

There are many reasons for reverse accumulation during the dry season.

The reason for the reverse measurement caused by the welding machine may be that there is a problem with the meter, so you have to find some maintenance masters to help you repair it.

So what is the reason for you to do reverse metering? There should be many reasons for this, take a look at the introduction on the Internet, and pay more attention to it.

Under normal circumstances, there should be no reverse active power, and there are several possible reasons for the occurrence of reverse reactive power;

1. The wiring error of the electric energy meter may "cause" the reverse active power; For people who do not have metering expertise, it is not easy to find out the wiring error of the electric energy meter, and you can ask professionals to check it locally;

2. There is power generation equipment connected to the grid inside, and the power generation may be excessive at a certain time, and when it is transmitted to the outside, the transmission direction of the electric power changes, and the electric energy meter will record the electric energy transmitted to the outside as "reverse active power";

3. Dual-power and multi-power supply users, there is power transmission when running in parallel; The transmission to the direction of the power grid is recorded as "reverse active power";

4. There are large electrical equipment inside, when the system is blacked out, the internal generator that is running can not stop at once due to inertia, and becomes a "generator", because the equipment does not use electricity at this time, the electricity sent out may be transmitted to the direction of the power supply through the electric energy meter, causing "reverse active power";

5. Due to the way of electricity theft, the active power of the electric energy meter is reversed.

If you want to eliminate the reverse amount of electricity generated by the user's large welding machine, then you can connect his ground wire somewhere else.

This phenomenon is mostly seen in old welding machines, and the solution is to add capacitance compensation cabinets or use new inverter welding machines.

The user's large electric welding machine generates reverse electricity. If you want to eliminate it, you have to go through one. One that eliminates the electric content. Reverse electricity can be eliminated.

All you have to do is turn the machine off and start it again.

The amount of electricity generated by a large welding machine should disappear in a single bit.

Since you will make this welding machine, you will know its performance.

How to eliminate the reverse electricity generated by the user's large welding machine, this is a physics problem, please ask the physics teacher.

How to eliminate the amount of electricity produced? It must be with that eliminator.

The no-load welding machine is equivalent to an inductor, and the no-load current is mainly inductive reactive current, but the inductance that crosses the phase can transfer the active current between the phases, so the active current of a certain phase is negative so that the phase energy meter reverses, but the total count of the three-phase electric energy meter cannot be negative, so the welding machine with 380V wiring will not steal electricity. The question of the fact that the inductors that are crossed between the phases can transfer the active current between the phases.

The principle is to cause the load to be unbalanced, and the power factor of the connected phase is low, and the line current is large, so the meter will be reversed, but the current electronic meter will not be like that.

Is it three single-phase watches or one three-phase meter? If a three-phase meter is to be reversed, and the light is still turned forward when the light is usually on, it means that the wiring phase sequence is wrong. If one of the three tables is reversed, it is normal.

The welding machine is a large inductance, and sometimes it will produce a large reverse electromotive force, which may be the reason!

Is the welder connected to the meter? When the meter comes out, it must be connected to the switch first, and then connected to the welding machine, and it will not be reversed when the wiring is correct.

The welding machine of no-load power transmission can be approximated as an ideal pure inductor because of its thick coil diameter, extremely low DC resistance, small number of turns, and large cross-sectional area of silicon steel sheet, and the induced potential of the inductor is exactly 90 ° behind its input potential, and this self-inductance potential will obviously supply power to its power grid in the case of ignoring its very small loss, which is generally called reactive current, in the power system, This phenomenon will greatly reduce the power supply capacity of the power grid (in enterprises with many motors, the power sector must install reactive power compensation equipment).

Now make an assumption, if it is far away from the grid transformer, and there are many neighbors in the vicinity who are using pure resistive loads or capacitive loads, then the no-load welding machine will give priority to providing a certain amount of electrical energy to these neighbors in reverse, and the watt-hour meter will be reversed, (the active watt-hour meter will reverse in the case of overcompensation).

Diode. There are forward and reverse, the forward R is very small, the reverse R is very large, the voltage is applied at both ends when the reverse is large, when the voltage is very large, there will be a current, he can withstand the maximum current is very small, when it is a little larger, it will burn out, that is, the reverse breakdown. Thank you!

When the reverse voltage applied to both ends of the diode increases to a certain value, the reverse current increases sharply, and this phenomenon is called reverse breakdown. The reverse voltage at breakdown is called the reverse breakdown voltage, and the reverse breakdown voltage is different for different diodes.

The reason for the reverse breakdown is that when the applied reverse voltage is too high, the number of holes and electrons increases greatly under the action of a strong electric field, which increases the reverse current sharply. This breakdown process is reversible provided that the product of the reverse current and the reverse voltage does not exceed the allowable dissipated power of the pn junction, and when the reverse voltage is reduced, the diode can be restored to its original state, otherwise the diode will burn out due to overheating. Therefore, in the actual circuit, a current-limiting resistor is often connected in series to protect the PN junction.

Forward and reverse metering is to count the maximum and minimum values of voltage, current, active power, reactive power, apparent power and other parameters of each phase in real time, and record the time of the event. All records can be read via communication.

If there is a reverse current, it will be directly included in the forward total power to prevent wiring errors, and its over-limit alarm function is the fixed-value over-limit setting system, which can start multiple analog fixed-value channels and logical fixed-value channels at the same time.

Forward and reverse metering, reverse inclusion in the total electric energy means that the forward current is measured according to the regulations. If there is a reverse current, it will be directly included in the total positive power, mainly to prevent theft and anti-wiring errors, and the forward user will generally not have a reverse amount of electricity, such as a large number of reverse electricity (in addition to the meter failure problem) The meter current line is reversed, and there is a situation that is the capacitive load, the power factor is low, and the output current.

That is, the forward current is measured according to the regulations. If there is a reverse current, it will be directly included in your total power, and it will be considered your use.

You check the electric energy meter of your unit to see if it is connected wrongly, and then check whether there is a lot of reverse active electricity, if there is a lot, it must be a problem with the wiring, but you can only see, and not do it, otherwise there will be the responsibility of "privately changing the electric energy metering device of the power supply enterprise";

If the reverse active power is not large, you check whether there is an electric motor in the unit that can be reversed, especially the hoist, which will automatically fall after the power is off, so that the motor becomes a generator, resulting in an external supply of active electricity.

Follow to become the 2nd fan.

Under normal circumstances, there should be no reverse active power, and there are several possible reasons for the occurrence of reverse reactive power;

1. The wiring error of the electric energy meter may "cause" the reverse active power; For people who do not have metering expertise, it is not easy to find out the wiring error of the electric energy meter, and you can ask professionals to check it locally;

2. There is power generation equipment connected to the grid inside, and the power generation may be excessive at a certain time, and when it is transmitted to the outside, the transmission direction of the electric power changes, and the electric energy meter will record the electric energy transmitted to the outside as "reverse active power";

3. Dual-power and multi-power supply users, there is power transmission when running in parallel; The transmission to the direction of the power grid is recorded as "reverse active power";

4. There are large electrical equipment inside, when the system is blacked out, the internal generator that is running can not stop at once due to inertia, and becomes a "generator", because the equipment does not use electricity at this time, the electricity sent out may be transmitted to the direction of the power supply through the electric energy meter, causing "reverse active power";

5. Due to the way of electricity theft, the active power of the electric energy meter is reversed.

When you have a crush on someone, when you know that he has the same crush on you, you will hate him for not having a very theoretical summary of lithromantic. But it is classified as an avoidant attachment personality and unrequited love, which is an unusual problem.

There is a sexual orientation called lithromantic, which means that after you have a crush on someone, when he has the same feelings for you, you will hate the feelings and even stop liking them.

Lithromantic, a psychology in which you have a crush on a person, but when he shows the same crush on you, you instead feel that you no longer like him, or even hate him. A mental illness that refers to a person who is accustomed to having a crush who chooses to run away when his or her crush shows the same emotions to him/her. Most of these people dare not love others from the bottom of their hearts because of the misfortune of their families when they were children, but they are very eager for love in their hearts.

A short circuit is when a circuit or part of a circuit is shorted. If the load and the power supply are connected by wires together, it is called a short circuit.

Cause of short circuit. 1. The component is damaged. Short circuits are often caused by damage to insulation or careless wiring. For example, equipment defects caused by aging equipment insulation materials, poor design, manufacturing, installation, maintenance, etc., develop into short circuits.

2. Influence of meteorological conditions. For example, scintillation discharge caused by lightning strikes, overhead line disconnection due to wind damage, and power pole collapse caused by wire icing.

3. Man-made destruction. For example, the staff pulled the switch with load, did not rule out the grounding wire closing and power supply when overhauling the line or equipment, the misoperation of the operation personnel, and the stealing of the wire and the carbon fiber bullet used in the Kosovo war and the Iraq war in the United States.

4. Other reasons. Trenching damages cables, birds and beasts kite jumps on current-carrying bare conductors, etc.

The phenomenon of direct connection between the positive and negative poles of the power supply without any load is called short circuit. A short circuit may be wet. The electrical connection is incorrect. Component aging.

There is no electric device between the positive and negative stages of the power supply, and the connection between them causes a short circuit.

The direct connection of the positive and negative electrodes is called a short circuit.

There are many reasons for this, such as breakdown of electronic components, the low resistance of another electronic component, etc.

The current flowing through the operation of a short-circuit power system when an abnormal connection (i.e., short circuit) occurs between phases or between phases and ground (or neutrals). Its value can be much greater than the rated current and depends on the electrical distance of the short-circuit point from the power supply. For example, in the event of a short circuit at the generator end, the maximum instantaneous value of the short-circuit current flowing through the generator can reach 10 to 15 times the rated current.

In high-capacity power systems, short-circuit currents can reach tens of thousands of amperes. This can have serious implications and consequences for the proper functioning of the power system.

There are 4 basic types of short circuits that occur in a three-phase system: three-phase short-circuit, two-phase short-circuit, single-to-ground short, and two-to-ground short-circuit. Among them, except for the three-phase short circuit, the three-phase circuit is still symmetrical, so it is also called symmetrical short circuit, and the other three types are asymmetric short circuits.

In the power network with neutral grounding, the short-circuit faults with one opposite to the ground are the most, accounting for about 90 of all faults. In the power network where the neutral point is not directly grounded, the short-circuit fault is mainly a variety of phase-to-phase short circuits.

When a short circuit occurs, the power system transitions from a normal steady state to a stable state of a short circuit, which generally takes 3 5 seconds. During this transient process, the variation of the short-circuit current is complex. It has a variety of components, and its calculations require the use of electronic computers.

The maximum instantaneous value of the short-circuit current that will occur about half a cycle (second) after the short circuit is called the inrush current. It generates a large electrodynamic force, the size of which can be used to verify the dynamic stability of mechanical stress in electrical equipment in the event of a short circuit. The analysis and calculation of short-circuit current is one of the important contents of power system analysis.

It provides an effective means for the planning, design and operation of the power system to select electrical equipment, tune relay protection, and analyze accidents.

On the electrical circuit, due to various reasons connected or collided, the phenomenon of sudden increase in current is called short circuit. The collision between the phase wires is called the same short circuit; A direct collision between the phase wire and the ground wire, the grounding conductor or the ground is called a short circuit to the ground. When the short-circuit current increases suddenly, the instantaneous heat release is very large, which greatly exceeds the heat generated by the normal operation of the line, which can not only burn the insulation, but also melt the metal, causing a fire caused by the combustion of combustibles.

The main reasons for the short circuit are: 1. The short circuit is caused by the aging of the line and the damage of the insulation; 2. The power supply is overvoltage, resulting in insulation breakdown; 3. Small animals (such as snakes, hares, cats, etc.) are connected on the bare wire; 4. Caused by a variety of man-made random pulling; 5. The line of the outdoor overhead line is relaxed, and it collides under the action of strong wind; 6. The line is installed too low and collides with various transport items or metal objects, resulting in short circuit.

To prevent short-circuit fire, first of all, it is necessary to install and maintain in strict accordance with the power regulations, and select appropriate wires and cables according to the specific environment. Secondly, strengthen maintenance management, minimize the human factor, and often use instruments to measure the degree of insulation of wires. Third, we must choose appropriate safety protection devices.

When the fuse protection is adopted, the rated current of the melt should not be greater than the times of the long-term allowable load current of the line; When protected by automatic switch, the setting current of the instantaneous action overcurrent tripper should not be greater than the times of the long-term allowable load current of the line. The fuse should be installed on the lead, and the fuse is not allowed to be installed on the neutral wire of the transformer.