What is the principle of capacitance compensation? How is it calculated?

For most industrial enterprises, the load of the power grid is relatively stable, so the compensation capacity of the power capacitor can be estimated according to the capacity of the transformer, which is generally 20%-40% of the transformer capacity.

For example, for a 1000kva transformer, the capacity to be compensated is 200-400kvar; A 2000kVA transformer needs to compensate for a capacity of 400-800kvar. The actual load of the enterprise needs to be considered for how much compensation capacity is used.

From the perspective of power supply, the ideal load is that p is equal to s and the power factor cos is 1. At this time, the utilization rate of the power supply equipment is the highest. In practice, this is not possible, and it is only possible to assume that the loads in the system are all resistive.

The nature of most of the electrical load equipment in the circuit is inductive, which causes the total current lag voltage of the system, so that in the power factor triangle, the reactive power Q side increases, the power factor decreases, and the efficiency of the power supply equipment decreases.

The function of the compensation capacitor is to compensate the reactive current of the generator, reduce the working load of the generator, and increase the usable capacity of the generator.

The compensation capacitor is used to increase the usable capacity of the generator, which can reduce the power consumption of the plant and improve the power supply quality and power supply capacity of the power generation and power supply equipment. In addition to the resistive load, most of the electrical equipment is an inductive electrical load, so that the voltage phase of the power supply is changed (that is, the current lags behind the voltage), and the capacitance compensation can be carried out according to the change of the electrical load, so as to reduce a large amount of reactive current, reduce the line power loss to a minimum, and provide a high-quality power source.

Capacitance compensation technology: AC asynchronous motors, welding machines, and electromagnets are widely used in industrial production.

Power frequency heater lead point equipment is an inductive load.

These inductive loads are converted in such a way that the voltage applied to them is one angle ahead of the current. Cosine of this angle.

It's called the power factor.

This current can be decomposed into the active component of the same phase as the voltage and the reactive component of the voltage that lags behind the voltage by 90 degrees. This reactive component is called the inductor reactive current.

When the power factor is very low, it is reactive power.

In large cases, there will be the following hazards: increasing the line current will increase the line loss and waste electric energy. Due to the increase of line current, the voltage can be reduced and the use of equipment can be affected. For the transformer, the greater the reactive power, the power supply bureau.

The more expensive the per kilowatt-hour charged, the more the power supply bureau may refuse to supply electricity when the power factor is lower.

Summary. The role of capacitance compensation: 1. Improve the active power of the power grid. 2. Reduce.

Line energy loss. 3. Improve the power supply capacity of the system. 4. Reduce the voltage drop of the line and improve the voltage quality of the power grid.

What is the role of capacitance compensation?

The role of capacitance compensation: 1. Improve the active power of the power grid. 2. Reduce line energy loss. 3. Improve the power supply capacity of the system. 4. Reduce the voltage drop of the line and improve the voltage quality of the power grid.

When the capacity of the low-voltage capacitor needs to be compensated is high, the power factor is greater than 1, and the line is capacitive, this situation is overcompensation. If there is overcompensation during reactive power compensation, the voltage of the enterprise is higher than the grid voltage, resulting in the increase of harmonics in the power grid, and in serious cases, resonance and damage to electrical equipment will occur. Overcompensation requires a reduction in the number of low-voltage capacitors.

Summary. Capacitance compensation is either reactive power compensation or power factor compensation. The electrical equipment of the power system will produce reactive power when used, and it is usually inductive, which will reduce the capacity use efficiency of the power supply, which can be improved by increasing the capacitance appropriately in the system.

Power capacitance compensation is also known as power factor compensation, (a combination of voltage compensation, current compensation, and phase compensation).

What is the role of capacitance compensation?

Capacitance compensation is either reactive power compensation or power factor compensation. The electrical equipment of the power system will produce reactive power when used, and it is usually inductive, which will reduce the capacity use efficiency of the power supply, which can be improved by increasing the capacitance appropriately in the system. Power capacitance compensation is also known as power factor compensation, (a combination of voltage compensation, current compensation, and phase compensation).

Is the capacitor overcompensated? Some.

Hehe, capacitors and BAI motors both need to be reactive.

du power zhi, but he.

The reactive power required by DAOs is exactly within the direction.

Hehe, in the 29 years that our company has been engaged in the research and development, production and sales of reactive power compensation equipment, there are often similar problems for new handies. This way:

Theoretically, the total capacity of the compensation cabinet, which is calculated as:

1. Count the electrical equipment first, and then calculate the natural power factor, total load, and so on of the equipment. This method is accurate, but it is not easy for the user's equipment to be accurate, not to mention that the load also changes during work, so this data is only one of the data of the final verification design.

2. According to empirical data. Generally, we take the compensation amount according to 30% to 50% of the transformer capacity. Assuming that your transformer is 1600kva, then the total compensation amount of the compensation cabinet is between 480kvar and 800kvar, and then the final value is determined according to the characteristics of the electrical equipment.

If the device generates harmonics, such as an inverter, the value is biased in the direction of the majority. At the same time, the capacitor is now cheap, and it is easy to age in a harmonic environment, so it is recommended that you take 800kvar.

At the same time, harmonics are very annoying, and it is recommended to compensate the device in the reactor. The capacity of the reactor should be determined according to the harmonic situation on site. There are a lot of similar materials on the Internet, so you may wish to look them up.

Where does you get this power factor from? None of the power meters I came into contact with could read.

Power factor: Do you mean the digital reading on the capacitance compensation cabinet? This compensation calculation should be found in the common calculation formula of electricians.

1. Detect the power p and power factor cos 1 when the motor is under normal load.

2. Determine how much you want to compensate the power factor, i.e. cos 2.

3. Calculate the capacitance to be compensated: q=p(tg 1-tg 2)

Note: It can be estimated according to the motor nameplate data before input.

For example, the power factor of the motor in the rated state is cos 1=, and the power factor cos 2=, cos 1= =, 1= =, 1= =, tg 1=, cos 2= =, 2= =, tg 2=, etc., is to be compensated according to the capacity of the motor.

1. The apparent power of the inductive load s The power factor of the load cos = the reactive power q:

s×cosφ =q

2. Phase no power q' = compensated three-phase reactive power q 33, because: q = 2 fcu 2 , so:

When 1 F capacitor and rated voltage is 380V, the reactive capacity is Q=100 F capacitor, and when the rated voltage is 380V, the reactive capacity is Q=?

At 1000 F capacitance and rated voltage 380V, the reactive power capacity is Q=45kvar4, "How much load needs how much capacitance":

1) You can calculate the reactive power q of the three phases first;

2) After calculating the reactive power of 1 phase Q3;

3) in the calculation of the capacitance c of 1 phase;

4) Then the triangles are connected!

5. Because: q =2 fcu 2 , so:

When 1 F capacitor and rated voltage is 10kV, the reactive capacity is Q=100 F capacitor, and when the rated voltage is 10kV, the reactive capacity is Q=3140kvar6, because: Q =2 FCU2, so:

When 1 F capacitor and rated voltage is 220V, the reactive capacity is Q=100 F capacitor, and when the rated voltage is 220V, the reactive capacity is Q=?

When the capacitance is 1000 F and the rated voltage is 220V, the reactive capacity is Q=