What aspects need to be paid attention to after the reactive power compensation equipment is put int

After the reactive power compensation equipment is put into operation, if the capacitor can be automatically put in or removed according to the reactive power of the system, and the power factor can reach a satisfactory value. The rest is to regularly inspect the devices and devices to check whether the terminals of switches, devices, and capacitors are overheated (discolored), and whether the operating sound of the capacitors is normal. Check the operating current of the capacitor with a clamp ammeter regularly, that's basically it!

The reactive power compensation device has the difference between high voltage and low voltage, and after the high-voltage reactive power compensation device is put into operation, in addition to regularly inspecting the equipment, it is also necessary to observe whether the equipment has abnormal noise during operation, especially the reactor. In low-voltage operation, because the protection is not as comprehensive as the high-voltage, it is necessary to observe whether the three-phase current is balanced at all times during operation, and whether the switching switch is operating normally, and there are certain differences in the detection methods according to the switching switch. At the same time, it is also necessary to check the components regularly, and whether the equipment is operating normally can be understood through the manufacturer's training.

Our factory uses Chengdu Ruijie's reactive power compensation device to feel that the daily maintenance of their equipment is relatively simple, and the equipment has also been systematically trained to us during commissioning, and we are now completing the maintenance of the equipment ourselves.

After the first operation, with an interval of 1-2 months, the lower nut should be re-tightened after power failure and discharge! Other faults are the protection of the reactive power compensation device! Heat dissipation, dust, and more!

It is similar to the general switch cabinet, and the other is the capacitor gap, so that the capacitor has enough clearance to facilitate heat dissipation.

Reactive power compensation is a very traditional power technology. The power system of many enterprises adopts reactive power compensation devices, which has made great contributions to energy conservation and environmental protection. Therefore, it is very necessary to use reactive power compensation devices. The main benefits of reactive power compensation device installation are as follows:

1) Reduce line loss by more than 50%. As far as the whole country is concerned, if the reactive line loss is reduced by 50%, it can save 50 billion kilowatt-hours of electricity every year, which is equivalent to half of the power generation of the Three Gorges Project.

2) Avoid fines. According to the Measures for the Adjustment of the Electricity Factor issued by the Ministry of Electric Power and the Price Bureau, the electricity fee can be reduced when the electricity factor is reached, and the electricity fee will be increased by 15% when the power factor is reached. For example, if the power factor of a 315kVA transformer is increased to above, the difference between rewards and punishments for electricity bills in one year is 340,000 yuan.

3) Improve the electricity carrying rate to achieve the effect of capacity expansion. For example, the power factor of a 315kVA transformer can only provide 189kW of active power at the last time, which is equivalent to an increase of 63%, that is, 1898kW to 309kW.

4) Improve power quality, prolong the life of electrical appliances, and ensure the normal operation of electrical appliances.

5) The reactive power compensation device can effectively reduce the fault of the distribution transformer and reduce the loss of the distribution of the enterprise. The use of low-voltage reactive power compensation devices can improve the voltage quality at the end of the power supply grid of enterprises. After the low-voltage reactive power compensation device is processed, it can significantly reduce the current on the circuit, reduce the voltage consumption on the power grid line, increase the voltage of the power supply end with low voltage in the past, and improve the voltage quality of the power supply end.

The main method to improve the power factor is to use low-voltage reactive power compensation technology, and there are three main methods usually used: random compensation, random compensation, and tracking compensation.

1) Random compensation.

Random compensation is to connect the low-voltage capacitor bank and the motor in parallel, and switch it to the motor through the control and protection device at the same time. Random compensation is suitable for compensating the reactive power consumption of the motor, mainly to compensate the reactive power of the excitation, which can better limit the reactive load of the electricity unit.

The advantages of random compensation: when the electrical equipment is running, the reactive power compensation is invested, and when the electrical equipment is out of operation, the compensation equipment is also withdrawn, and the compensation capacity does not need to be adjusted frequently. It has low investment, small footprint, easy installation, convenient and flexible configuration, simple maintenance, and low accident rate.

2) Random compensation.

Random compensation refers to the compensation method in which the low-voltage capacitor is connected to the secondary side of the distribution transformer through the low-voltage fuse to compensate for the no-load reactive power of the distribution transformer. The reactive load of the distribution transformer at light load or no load is mainly the no-load excitation reactive power of the transformer, and the no-load reactive power of the distribution transformer is the main part of the reactive load of the power consumption unit, and for the distribution and transformation of light load, this part of the loss accounts for a large proportion of the power supply, which leads to the increase of the unit electricity price.

The advantages of random compensation: simple wiring, convenient maintenance and management, can effectively compensate for the no-load reactive power of the distribution transformer, limit the reactive power base load of the rural network, and balance the reactive power of this part on the spot, so as to improve the utilization rate of the distribution transformer, reduce the reactive power network loss, have high economy, and are one of the most effective means of reactive power compensation at present.

3) Tracking compensation.

Tracking compensation refers to the compensation method that uses the reactive power compensation switching device as the control and protection device to compensate the low-voltage capacitor bank on the bus of the large user. It is suitable for special distribution users of more than 100kva, and can replace random and random compensation methods, and the compensation effect is good.

Advantages of tracking compensation: flexible operation mode, small operation and maintenance workload, relatively longer life and more reliable operation than the first two compensation methods. Tracking compensation should be preferred.

Hello: The common methods of reactive power compensation and power factor improvement of power equipment mainly include: synchronous motor, self-leveling machine, series capacitor compensation, shunt capacitor compensation, series reactor compensation (ultra-high voltage transmission line) and SVC, SVG compensation.

SVG is a reactive power compensation device that actively emits reactive power equal to the amplitude and opposite of the reactive power of the system through the power electronic device IGBT and its control circuit, and compensates the reactive power of the system in a way of offsetting, which is the development direction of reactive power compensation in recent years.

For the operation of specific projects, the compensation methods can be divided into: local decentralized compensation and centralized compensation.

Local compensation is to set up a reactive power compensation device in the load place to compensate for a single equipment, this compensation method, the compensation effect is good, and the reactive power loss is minimal. However, there are many equipment that needs to be compensated, and the investment is large, which is not convenient for maintenance management.

Centralized compensation is to set up a reactive power compensation device in the substation and distribution room to compensate for the reactive power in the area, which has a good compensation effect and high economy. Since several types of compensation sampling are generally set up at the metering point, the interest rate of electricity can be minimized.

In the professional field, there are also transmission line compensation (high and low voltage), submerged arc furnace low voltage short network compensation, flameproof compensation device, etc.

Centralized compensation and in-situ compensation.

Answer]: a, b, c

Article 1 of the Design Code for Imperial Power Supply and Distribution System (GB 50052-2009) stipulates that when the switching mode of the reactive power compensation device has one of the following circumstances, it is advisable to use the reactive power compensation and cleaning device with manual switching: Capacitor bank to compensate for low-voltage basic reactive power; Perennial stable reactive power; Transformers that are frequently put into operation or high-voltage motors and high-voltage capacitor banks that are switched less than three times a day.