Low-voltage reactive power compensation cabinet maintenance

The role of the low-voltage reactive power compensation device in the power supply system is to improve the power factor of the power grid, reduce the loss of the power supply transformer and transmission lines, improve the power supply efficiency, and improve the power supply environment.

Therefore, the reactive power compensation device is in an indispensable position in the power supply system. Reasonable selection of low-voltage reactive power compensation devices can minimize the loss of the network and improve the power quality of users.

On the contrary, unreasonable selection or improper use may also cause various uncontrollable factors such as voltage fluctuation, flicker, and harmonic amplification in the power supply system.

Reactive compensation equipment replacement method

Separate the power switch of the controller and install the main switch separately. It is safest to wait for 20 minutes. Generally, there are discharge resistors inside the capacitors → replace them with capacitors of the same voltage level and capacity; If it is large, then both the shunt switch and the primary line have to be replaced with larger ones. After replacing the capacitor, check the firmness of the screws, and use a shaker and a multimeter to check the insulation and whether there is a short circuit.

Reactive power compensation maintenance

1. The inspection and inspection of the capacitor cabinet in operation should be strengthened.

Monitor temperature, voltage, current. The ambient temperature of the capacitor cabinet shall not exceed 40 degrees Celsius, and the temperature of the capacitor body shall not exceed 60 degrees Celsius; with regard to voltage monitoring, it is generally stipulated that when the voltage is higher than 1.05 times the rated voltage, the capacitor can run for a long time, and it is allowed to be within a day and night, and the maximum is not more than 1.1 times the rated voltage. Run under rated voltage for no more than 6 hours; during inspections, check whether the capacitor casing is expanded, the porcelain casing is broken, oil leaks, whether the joint is hot, and whether the ventilation is good.

2. The reactive power automatic compensation controller is a key component of the capacitor cabinet. Whether it can work normally will directly affect the normal operation of the capacitor cabinet. Therefore, users must fully understand the functional characteristics of the controller, operating conditions, technical parameters, installation and wiring, general qualitative inspection, and system troubleshooting.

Reactive power compensator importance

Generally speaking, the significance of using reactive power compensation devices to improve power factor is reflected in two aspects: one is to reduce the power loss on the transmission line; the other is to give full play to the potential of power equipment (such as motors, transformers, etc.).

Because the electrical appliances always work under a certain voltage and a certain active power, if the power factor is low, a larger current must be used to ensure the normal operation of the electrical appliances, and the transmission current will increase, resulting in increased line losses.

In addition, any power equipment always works within a certain rated voltage and rated current. Exceeding the rated voltage will threaten the insulation performance of the equipment; if the operating current exceeds the rated value, the internal temperature will rise too high, thereby reducing the equipment. service life.

For some power generation equipment, the improvement of the power factor can greatly increase the efficiency. For example: a generator capacity of 1500kW, when the power factor of the power system increases from 0.6 to 0.8, the actual power generation capacity can be increased to 3000kW.

What energy-saving benefits can low-voltage reactive power compensation achieve?

1. Low-voltage reactive power compensation can improve the power supply capability of enterprise power equipment.

According to the relevant knowledge of the enterprise power system, the power supply capacity of the power supply and distribution equipment is mainly determined by the transmission capacity of the line and the capacity of the distribution transformer. For an electrical load of a certain capacity, when its active power is constant, the lower the power factor, the greater the current that needs to be provided.

After the reactive power compensation, the reactive power required by the load is provided by the compensation capacitor, and the line and the transformer only need to provide the active power, so the current on the line and the transformer is greatly reduced, which can meet more load requirements. In other words, the power supply capacity of the power supply and distribution equipment is improved.

2. Reactive power compensation can also reduce the failure of its distribution transformers for enterprises and reduce the loss of power supply and distribution lines of enterprises.

Due to the large electricity load in the enterprise, the current of the power supply and distribution lines and the transformer is greatly reduced, and the loss on the distribution transformer and the power supply line is proportional to the square of the current passing through it, so the loss can be greatly reduced. It also reduces the possibility of electricity failure.

In addition, the use of low-voltage reactive power compensation can further improve the voltage quality of the power supply end of the enterprise. After reactive power compensation, the current on the line can be significantly reduced, and the voltage loss on the line can be greatly reduced, increasing the original voltage. Lower supply terminal voltage, thus improving the voltage quality at the supply terminal.

3. The low-voltage reactive power compensation device can save electricity costs for enterprises and reduce electricity expenses.

According to the previous understanding, reactive power compensation can reduce the active power loss of power supply lines and transformers, improve the power factor of the system, and cancel the power supply company's increased power rate to adjust the electricity bill. In this way, the corresponding reduction can be achieved and there are certain incentives, so the expenditure on electricity bills can be reduced and better energy-saving benefits can be brought to the enterprise.