Capacitance compensation cabinet problem, under what circumstances can the capacitance compensation

The current of the capacitor compensation cabinet is only related to the capacity of the capacitor, and has nothing to do with the load. Capacitance is power factor related to making and disconnecting. Your thermal protection jump may be a mismatch between the thermal protection and the capacitor, the setting current is too small, or the capacitance compensation is too frequent, and the power factor and the compensation value are not matched, causing a group of capacitors to be engaged and disconnected.

The thermal relay in the capacitor cabinet is to protect the capacitor, and whether it operates or not is only related to the actual operating current of the capacitor, and has nothing to do with the electrical load. (When the electrical load is large, if the power factor is low, you may need to put several more sets of capacitors).

Thermal relay tripping should be checked for the following:

1. Check whether the current through the thermal relay has exceeded its setting current (such as: whether the setting value is too small, whether the current increases due to the presence of harmonics and other factors.) ）

2. Check whether the ambient temperature is too high and affects the malfunction of the thermal relay.

3. Check whether the thermal relay itself is normal (qualified).

1) Thermodynamic relays are commonly known as thermocouples, there is no detailed provision on the positive determination principle, the key is to see what mechanical load you use on, generally set at multiple times of the rated current. If the value is too small, it's easy to bounce back!

2) The function of the thermal relay is to automatically cut off the power supply when the motor is overloaded, and the structure of the thermal relay is composed of two metal sheets with different expansion coefficients, and when the current is too large, the expansion coefficient is large first, which plays the role of cutting off the power supply. The thermal relay must be manually reset after it has been actuated.

Selection of thermal relay: rated current * protection current column of thermal relay: rated current: 10 amps.

10 amps* amps.

Choose a 20 amp thermal relay.

The input of the capacitance compensation cabinet is divided into two situations (whether manual or automatic);

a. The power factor is mainly considered, and the purpose is not to be fined by the Electricity Bureau. The input condition is that the power factor of the bus is lower than the prescribed limit of the Electric Power Bureau (for example, the Electric Power Bureau examines it, then, when the power factor of the bus is lower, the capacitor cabinet should be put into it, and the input is automatic or manual, depending on how the compensation cabinet on your site is done), and the removal condition is that the power factor reaches the upper limit (for example.

b. The main consideration is the bus voltage to ensure the safe operation of the equipment at the end of the bus. When a capacitor is put into operation, it will cause an elevation of the bus voltage. In some places, the bus voltage is low, resulting in the equipment can not be started at all (such as low-voltage system, rated 380V, some system voltage is low, only 340V, at this time, the lower end of the equipment can not be started at all, after putting in some capacitors, the bus voltage can be raised to the rated voltage, at this time there may be overcompensation), at this time do not consider the level of the power factor, with the principle of voltage priority, input or cut off the capacitor, here, the capacitor acts as a regulating bus voltage, rather than power factor compensation.

1. Through visual inspection, when it is found that the capacitor is bulging and bursting, it should stop working immediately and replace it.

2. Inspection records: Capacitors have a certain service life, and the service life of general capacitors is about 5 years. Based on the replacement record, determine whether the capacitor needs to be replaced.

3. Use detection tools: If there is no obvious abnormality in visual inspection, the record is chaotic and cannot be found, the capacitor should be tested with tools.

4. If the shell of the power capacitor is found to be deformed, and it is proved that the insulating medium and electrode in the capacitor are damaged, the power capacitor should be removed in time and replaced with a new one.

It is carried out during non-peak hours to reduce the impact of reactive power loss of the line.

The first step is to turn off the controller of the compensation cabinet (if there is one) and then pull down the knife switch of the compensation cabinet.

Confirm the capacitor to be replaced, and discharge it reliably (ground discharge, three-phase short-circuit discharge is also acceptable).

Remove the capacitor to be replaced, reliably install the new capacitor of the same specification in the position of the original and old capacitor, and connect the wiring correctly (the new capacitor should be installed after testing it normally).

Close the knife switch of the compensation cabinet and open the controller of the compensation cabinet.

If there is a compensation cabinet controller, use the self-test function of the controller, first carry out a self-test of the compensation cabinet, and complete the replacement work after normal, if it is manually compensated, then you can first carry out this capacitor"Prioritize investment"During the whole process, if any abnormalities are found, the compensation cabinet should be closed immediately for inspection and treatment.

It is advisable to keep a written record of the entire replacement so that it can be checked, and preferably by two people.

The reasons for insufficient compensation of the capacitor bank may be as follows:1Changes in electricity load.

When the electrical load changes, the compensation effect of the capacitor will also be affected, if the capacitor capacity in the capacitor cabinet is not large enough or the number is insufficient, it will lead to insufficient compensation. 2.Capacitors are damaged by aging.

Capacitors will gradually age in long-term use, resulting in a decrease in capacitance value, and if not replaced or repaired in time, it will lead to insufficient compensation effect of the capacitor cabinet. 3.Poor line contact.

The capacitors in the capacitor cabinet may be in poor contact or loose with other electrical equipment, resulting in the capacitor not working properly, which will affect the compensation effect of the capacitor bank. 4.The design of the capacitor bank is unreasonable.

The design of the capacitor cabinet should be reasonably selected and designed according to the actual electrical load and compensation requirements, if the capacity, quantity, and capacitor return device selection of the capacitor cabinet are unreasonable, it will lead to insufficient compensation effect. To sum up, there may be many reasons for insufficient compensation of the capacitor cabinet, which need to be analyzed and judged according to the specific situation, so as to take corresponding maintenance or adjustment measures.

Summary. Hello dear, I am glad to answer for you, and I will find out that the reasons for the insufficient compensation of the capacitor cabinet are: 1. The controller is damaged.

2. Improper control settings After all the previous controller controls were removed, there was no restoration. 3. Whether the coil on the secondary side of the capacitor cabinet is damaged, if the system current cannot be detected, it will not be compensated. Hope mine can help you!

The capacitor cabinet shows several but every month are fined what is the reason.

Hello dear, I am glad to answer for you, and I will find out that the reasons for the insufficient compensation of the capacitor cabinet are: 1. The controller is damaged. 2. Improper control settings The previous controller, such as the mega control, was all cut off after the mega base, and there was no restoration.

3. Whether the coil on the secondary side of the capacitor cabinet is damaged, if the system current cannot be detected, it will not be compensated. I hope you can help you!

Extended information: The capacitance compensation device is determined by the starting point of the compensation controller, for example, when the starting and adjusting dust discussion point is set to power factor = when the compensation device is automatically put into operation. When the power supply network power equipment is started and put into operation one after another, due to the increase of the reactive power component of the network, the COS of the power factor decreases, and the device is automatically put into operation.

Penah. But the table shows that it is larger, and the power supply company shows only.

Hello dear, it should be a problem on the side of the power supply company, you can negotiate with the staff of the power supply company to deal with it!

Brand model: Redmibook Pro 15 System: Windows 10

The capacitance compensation cabinet is used to compensate the reactive current of the generator, reduce the working load of the generator, increase the usable capacity of the generator, reduce the power consumption of the factory, save industrial power, and improve the power supply quality and power supply capacity of the power generation and power supply equipment.

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).

Capacitors maintain a high average voltage in AC circuits. Near-peak, high charge and low discharge, which can improve the stability of increasing circuit voltage. The power compensation capacitor bank provides a large instantaneous current to reduce the impact on the grid by compensating for the burst start of a high-current load.

A large number of inductive loads in the circuit will cause the phase of the grid to deviate (the inductive element will cause the AC current phase lag and the voltage phase will be 90 degrees ahead), and the characteristics of the capacitor in the circuit are just the opposite of the inductor, which plays a compensating role.

Summary. Hello dear, glad to answer for you! <>

The total working principle of the capacitor compensation cabinet is that the capacitor compensation cabinet is connected with the power system, so that the excess reactive power in the power system can be absorbed. When the reactive power in the power system is excessive, the capacitor compensation cabinet will release the energy stored in the capacitor to provide the required reactive power, so that the reactive power of the power system can be compensated and ensure the stability and efficiency <> of the power system

<> how does the capacitance compensation cabinet always work.

Hello dear, glad to answer for you! <>

The total working principle of the capacitor compensation cabinet is that the capacitor compensation cabinet is connected with the power system, so that the excess reactive power in the power system can be absorbed. When the reactive power in the power system is excessive, the capacitor compensation cabinet will release the energy stored in the capacitor to provide the required reactive power, so that the reactive power of the power system can be compensated and ensure the stability and efficiency <>of the power system

Regularly check the status of the capacitor, including appearance, terminal block, insulation status, etc. Regularly inspect the capacitor bank for loose fasteners such as connecting bolts, busbar terminals, and grounding bolts. Regularly clean the capacitor bank and its surroundings of dust, dirt, etc., and keep the capacitor compensation cabinet clean and hygienic.

Conduct a discharge test of the capacitor bank on a regular basis to determine whether the capacitor needs to be replaced. Regularly inspect the air filter and vent inside the capacitance compensation cabinet, clean or replace the clogged filter, and keep the capacitance compensation cabinet well ventilated. Regularly check the grounding of the capacitor compensation cabinet to ensure reliable grounding.

Regularly check the contact between the power switch and the terminal block of the capacitor compensation cabinet to ensure that the circuit is energized normally. <>