How to do the graduation design of the capacitance compensation cabinet????

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

2. Capacitance compensation: The capacitance and load of the capacitance compensation of the distribution cabinet are connected in parallel, and the capacitance is the same as the power bank. When the load increases, the output voltage of the power supply decreases due to the internal resistance of the power supply.

Because the two ends of the capacitor have to maintain the original voltage, that is, part of the electricity in the capacitor has to flow out, which delays the downward trend of the voltage.

3.Method: Parallel capacitors, generate capacitive current to offset the inductor current, and reduce the so-called reactive current that does not do work to a certain range. Reactive power supply, like active power supply, is an indispensable part to ensure power quality, and reactive power balance should be maintained in the power system.

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.

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.

The working principle of the capacitor compensation cabinet is that after the capacitor is connected in parallel, the current of the capacitor will offset a part of the inductor current, so that the inductor current will be reduced, the total current will be reduced, the phase difference between voltage and current will be reduced, and the power factor will be improved.

Capacitor Compensation Cabinet Function:

1. It 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 with a certain reserve, save industrial electricity, and improve the power supply quality and power supply capacity of the power generation and power supply equipment;

2. Reduce the transmission of reactive energy on the distribution line, so the power loss on the distribution line can be reduced.

3. Tap the potential of the equipment, improve the output of the equipment, and fully improve the utilization rate of the equipment (such as transformers);

4. Compensate for inductive reactive power, improve power factor, save electric energy, and reduce electricity expenses;

5. Increase voltage and improve power quality.

The function of the compensation cabinet: the current is 90 degrees ahead of the voltage, and the parallel Changshan of the capacitor is used to increase the line voltage and reduce the reactive power loss.

Attention to the opening of the capacitor cabinet: when opening, check whether the switches and circuit breakers are closed, and then close the cabinet door and twist the door handle in the closed position, confirm that it is correct, and close the knife open.