Why did the power department fine us more after the company installed the reactive power compensatio

This shows that it is overcompensated and prone to such problems when operating at low loads. The main reason is that the capacity of the first few sections of the capacitor is set too large (generally no matter how many sections are the same capacity), when running at low load, cut off a capacitor to undercompensate, and after investment, it will be overcompensated. The reactive power assessment of the power supply company is:

It is positive and reactive, and this unreasonableness has existed for a long time.

If you want to solve this problem, the easiest way is to adjust the capacity of the capacitors in the first few sections according to the actual situation of low-load operation in the field, so as to achieve low-load operation without making up for it. This may be due to production reasons, there are several load segments, and it should also be noted. If you want to solve it completely, it is to use a dynamic reactive power compensation device, which has a large investment, but can basically achieve "linear" compensation.

How big is the transformer, is it high-voltage metering, or low-voltage metering, how many degrees of electricity is used in a month, is the welding machine commonly used, in my experience, it should be fined before the installation Because you only installed the reactive power compensation cabinet on September 20, 2011, and the power supply company is less than 10 days, this has something to do with your electricity It also depends on whether the compensation cabinet you just installed is installed by a professional person.

It may be an installation problem or the adjustment is not right, how much capacitor capacity is installed, can you tell me how much active power is this month, how much is the reactive power, I can help you solve it.

The function of the reactive power compensation cabinet is to do reactive power compensation, provide the necessary reactive power with the help of reactive power compensation equipment, improve the power factor in the power supply system in the power supply system, reduce the loss of power transformer and transmission line, improve power efficiency, improve the power supply environment, and improve the quality of the power grid.

1.Improve the power quality, improve the operating conditions of the equipment, ensure that the equipment works under normal conditions, and is conducive to safe production.

2.It can save electric energy, reduce production costs, and reduce the electricity cost of enterprises.

3.Improve the utilization rate of enterprise electrical equipment and give full play to the potential of enterprise equipment.

4.It can reduce the power loss of the line and improve the transmission efficiency of the power grid.

In order to keep the current and voltage in phase as much as possible, the power factor is improved, and the purpose is to ensure the power supply quality of the power supply network. So the power supply bureau will fine you when your power factor is low.

Reactive power compensation is to improve the power factor when the load measurement inductive load is large.

The function of the reactive power compensation cabinet is to do reactive power compensation, provide the necessary reactive power with the help of reactive power compensation equipment, improve the power factor of the power grid and electrical equipment in the power supply system, reduce the loss of power supply transformer and transmission line, improve the power supply efficiency of the power grid, improve the power supply environment, and improve the quality of the power grid.

The reactive power compensation cabinet has an important position in the power supply. With a reasonable compensation device, the loss of the power grid can be minimized. On the contrary, if the selection or use is improper, it may cause many factors such as power supply system, voltage fluctuations, harmonic increases, etc.

Reactive power compensation is to use an external current source to compensate for the reactive power consumed during the operation of the load, and the equipment that provides this current source becomes the reactive power compensation equipment, and the common compensation equipment is the parallel power capacitor.

An external current source is used to compensate for the reactive power consumed during the operation of the load, and the equipment that provides this current source becomes a reactive power compensation device, and the common compensation device is a parallel power capacitor;

The main function of the ordinary low-voltage cabinet used to prevent capacitors, reactors and primary and secondary circuits is to compensate for reactive power.

The purpose of reactive power compensation is to use an external current source to compensate the reactive power consumed during the operation of the load, and the equipment that provides this current source becomes the reactive power compensation equipment, and the common compensation equipment is the parallel power capacitor.

Taking the power capacitor as an example, its simple principle is to use the characteristics of the capacitor's energy storage and output reactive current to make the power capacitor and the system in parallel, and offset the reactive current in the power grid by outputting the reactive current, so as to achieve the purpose of saving energy and reducing consumption and improving power quality;

Commonly used reactive power compensation methods in power grids include:

Centralized compensation: installation of shunt capacitor banks in high and low voltage distribution lines;

Group compensation: install parallel compensation capacitors on the low-voltage side of the distribution transformer and the distribution panel in the user's workshop;

On-site compensation for a single motor: Install shunt capacitors at a single motor.

The installation of reactive power compensation equipment can not only reduce power consumption and improve the power factor, but also fully tap the potential of the equipment to transmit power.

When determining the reactive power compensation capacity, the following two points should be noted:

Overcompensation should be avoided at light load, and it is also uneconomical to increase power loss caused by reactive power retransmission.

The higher the power factor, the smaller the effect of reducing losses per kilovolt compensation capacity, and in general, increasing the power factor to a higher level is a reasonable compensation.

Explanation: The so-called reactive power compensation cabinet is an ordinary low-voltage cabinet used to prevent capacitors, reactors and primary and secondary circuits, and its main function is to do reactive power compensation.

Introduction: Convert electrical energy into another form of energy, which is a necessary condition for electrical equipment to be able to do work, and this energy is periodically converted with electric energy in the power grid, and this part of the power is called reactive power. The purpose of reactive power compensation is to use an external current source to compensate for the reactive power consumed during the load operation, and the equipment that provides this current source becomes a reactive power compensation device.

1. Many electrical equipment in the power grid works according to the principle of electromagnetic induction. They establish an alternating magnetic field during energy conversion, and the power absorbed and released in a period are equal, and this power is called reactive power. In the power system, not only the active power is balanced, but also the reactive power is balanced.

2. Under a certain active power, the smaller the power factor cos of the power consumption enterprise, the greater the reactive power required. If the reactive power is not supplied by capacitors, it must be supplied by the transmission system, and the capacity of the power supply lines and transformers needs to be increased in order to meet the power requirements. In this way, not only will the investment in power supply be increased and the utilization rate of equipment will be reduced, but also the line loss will be increased.

To this end, the national rules for power supply and consumption stipulate that reactive power should be balanced on the spot, and users should design and install reactive power compensation equipment on the basis of improving the natural power factor of electricity, and put it into or cut off in time with its load and voltage changes to prevent reactive power reversing. It also stipulates that the power factor of the user should meet the corresponding standard, otherwise the power supply department can refuse to supply power.

Therefore, it is of great significance to automatically compensate the reactive power to improve the power factor and prevent the reactive power from being reversed, so as to save electric energy and improve the quality of operation, whether it is for the power supply department or the power consumption department. The basic principle of reactive power compensation is that a device with a capacitive power load and an inductive power load are connected in parallel in the same circuit, and energy is exchanged between the two loads.

In this way, the reactive power required by the inductive load can be compensated by the reactive power output by the capacitive load. At present, shunt capacitors are widely used as reactive power compensation devices at home and abroad. This method is easy to install, short construction period, low cost, easy to operate and maintain, and low self-loss.

Third, the main role of using shunt capacitors for reactive power compensation:

1. Improve the power factor.

2. Reduce the loss of transmission lines and transformers.

3. Improve voltage quality 4. Improve equipment output.

When the reactive power loss of the equipment used is too much, the automatic control system can be used to input capacitors to compensate, reduce the reactive power loss and improve the power factor.

Precautions for maintenance of reactive power compensation cabinet:

1. The power transmission sequence of the device.

1) Close the small circuit breaker Q1 and Q2 and observe whether the panel meter is working normally.

2) Close the circuit breaker installation door and lock it, and close the incoming circuit breaker QF.

3) Turn the power knob of the controller to the "cast" position, and observe whether the controller display is correct and whether the capacitor bank switching is correct.

4) Disconnect the power supply of the controller immediately if an abnormality is found.

2. The power-off sequence of the device.

1) Hit the power knob of the controller to the "cut" position, and cut off all the capacitor banks.

2) Disconnect the incoming circuit breaker QF and open the circuit breaker installation door.

3) Disconnect the small circuit breaker Q1 and Q2, and the power-off operation is completed.

3. After the circuit breaker is divided and closed for many times, the local ablation of the main contact may cause carbonization, which will increase the contact resistance, and should be maintained and overhauled regularly.

4. Be sure to ensure that the device has a good grounding, and the grounding resistance is less than ohms.

5. When disassembling the controller and instrument, the secondary circuit of the current transformer should be short-circuited to prevent the current transformer from opening the circuit.

6. If the circuit breaker in the device trips due to a fault, it is necessary to check the accident scene, analyze the cause of the trip, and find out the cause of the tripping (press down the handle during operation and put the handle of the circuit breaker into the normal opening position), and then allow the circuit breaker to be closed.

7. When maintaining and replacing the capacitor, first power off the controller, and then put the handle of the incoming circuit breaker into the normal opening, the capacitor discharge time should be greater than 1 minute, and then the voltage at both ends of the capacitor can be measured with the DC gear of the multimeter, and the operation can only be carried out when the voltage is low by 50V.

8. Regular inspection should be carried out to observe whether the capacitor switching is normal. If you find an abnormality, you should do the corresponding treatment in a timely power outage, please pay special attention to the debugging and maintenance, because the cabinet door has no interlocking mechanism, so there is still electricity in the device when the cabinet door is opened.

The reactive power compensation cabinet is connected in parallel in the power grid to provide reactive current and improve the power factor. The purpose of reducing the reactive power compensation is to use an external current source to compensate the reactive power consumed during the load operation, and the equipment that provides this current source becomes a reactive power compensation cabinet, and the common compensation equipment is a parallel power capacitor. Taking the power capacitor as an example, its simple principle is to use the characteristics of the capacitor's energy storage and output reactive current to make the power capacitor and the system in parallel, and offset the reactive current in the power grid by outputting the reactive current, so as to achieve the purpose of saving energy and reducing consumption and improving power quality;

The current reactive power compensation cabinet is basically automatically switched, so it only needs to set the power factor controller on the compensation cabinet in the process of use.

The maintenance of the reactive power compensation cabinet is also very simple, and there is basically nothing that needs to be maintained. It is only necessary to regularly check the temperature of the main components (capacitors and reactors) in the cabinet, and if possible, you can check the capacitance value of the capacitor once a year (the capacitance meter can be used) to ensure that the capacitance value of the capacitor has no attenuation. The compensation cabinet with automatic control can be unattended.

For the high-voltage compensation cabinet, manual switching is generally adopted, and only the switch needs to be operated. For the maintenance of high-voltage compensation cabinets, it is best to ask professional personnel or manufacturers to maintain them.

The most important thing is capacity monitoring, appearance monitoring, and protection components (fuses and thermal relays are often damaged, and they need to be reset when they are open and empty) The contactor should look at the contacts. There is also the need to screw the wiring.

The maintenance of the reactive power compensation cabinet needs to pay attention to whether the compensation capacitor has a bulging belly phenomenon, if there is, the capacitor should be replaced, and even the compensation capacitor switching contactor can not be replaced with an ordinary contactor.

1. Check and tighten the connecting screws; 2. Clean up the dust; 3. Check whether the switching switch is broken (contactor and no contact) and need to be replaced, and replace it in time; 4. Check whether the capacitor is bulging or leaking, and the capacitance can be measured if possible; 5. Check the fastening screws of the secondary wire.

One. The control head panel input indicator light is on, but the AC contactor does not engage. This phenomenon is caused by the coil of the AC contactor not getting power, or the voltage is too low. It should be checked whether the wiring of the AC contactor is consistent with the drawing and whether the insurance is in good condition.

Two. The power factor value is normal but the polarity is opposite, such as the hysteresis shows the lead, this phenomenon in the voltage and current signal wiring is completely correct, as long as the polarity of the current signal can be exchanged.

Three. With the input of capacitors, the power factor changes abnormally or insignificantly. The former phenomenon is caused by incorrect sampling of voltage or current, and the sampling of the signal should be emphasized.

The latter is caused by the wrong position of the signal current transformer, and the current transformer should be socketed in a place where its output can reflect the current conversion of the total load (such as the main cabinet bus).

Four. The controller header always shows c....0, This phenomenon is caused by the signal current input to the controller is too small or there is no current input, and the ratio of the current transformer should be calculated whether it is reasonable.

Whether the current signal circuit is open or connected to other instruments in series. --Wuhan Guodian Xigao.

1.The fast-melting insurance of the compensation cabinet is divided into groups, and the new fast-melting is replaced after the power is off;

2.Compensate for the damage of the capacitor in the compensation cabinet (burnt terminals, deformed capacitors, etc.), check regularly, and then turn off the power after finding the bad capacitor, and then replace the new capacitor.

Common faults of reactive power compensation cabinets:

1. Overvoltage.

The time, amplification, and frequency of overvoltage are closely related to the life of the power capacitor. Prolonged overvoltage causes power capacitors to heat up, which in turn accelerates insulation aging. When the grid voltage exceeds a multiple of the rated voltage of the power capacitor, it should be withdrawn from operation.

2. Bulging belly deformation.

When the inside of the power capacitor tank fails during operation, the high temperature of the arc will decompose the insulating oil, and the large amount of gas generated will deform the bulge of the fuel tank. In this case, the equipment should be decommissioned immediately, deactivated and replaced.

3. Oil leakage. The power capacitor itself is a fully sealed device, and if the seal is not tight, air impurities and moisture will enter the inside of the power capacitor and affect the internal structure. If an oil leak occurs from a power capacitor, it is necessary to reduce the load or reduce the ambient temperature, and it is not possible to operate it for a long time. If the power capacitor leaks seriously, it should be stopped and replaced in time.

4. The circuit breaker automatically trips.

In this case, we must first check whether the capacitor has **, bulging belly, and oil injection, and then check the circuit breaker, current transformer, and power cable of the capacitor, if these are normal but due to external faults that cause bus voltage fluctuations are circuit breaker tripping, after 15min in the suitable brake, these reasons can not be tested before being identified.