With the increasing emphasis on environmental protection in China, more and more sewage treatment plants are located all over the country. At present, the energy shortage in cities is becoming more and more serious, which requires sewage treatment plants to use less energy to obtain greater benefits.
At present, many domestic sewage treatment plants are forced to suspend production because they can't afford the high operating costs. As a result, the previous investment can’t be able to obtain the due benefits, which not only affects the effectiveness of sewage treatment, but also causes certain economic losses. Therefore, it is an important means to optimize the electrical energy saving, save the energy cost and reduce the treatment cost to ensure the normal operation of the sewage treatment plant.
At present, reactive power compensation can be divided into centralized compensation and decentralized compensation. Moreover, most sewage treatment plants use decentralized compensation or simply do not use reactive power compensation for cost consideration. So the problem follows is that the power factor cannot meet the requirements, which increases the reactive power loss of the power supply system, increases the operation cost of the sewage treatment plant, increases the copper loss of the transformer, increases the voltage loss and reduces the power supply quality. Although the decentralized compensation can meet the compensation effect of load distribution line to a certain extent, due to the scattered installation locations, the later operation and maintenance workload is very large.
In the sewage treatment plant, the power distribution station plays an important role, and the load of the sewage treatment plant is generally concentrated, and the power distribution station is generally located at the load center. At this time, the centralized compensation of low-voltage distribution is adopted, which has a significant effect on reducing the copper loss of the transformer, and is convenient for maintenance and management. At the same time, it can improve the utilization rate of the transformer, reduce the reactive power loss of power supply system, improve the power factor, reduce the voltage loss and improve the quality of power supply.
Reactive power compensation design
According to the load type and transformer capacity of a sewage treatment plant in Jiangnan, the reactive power compensation design capacity configuration between the incoming cabinet and the load is as follows:
SLG series harmonic elimination reactive power compensation components
SLG harmonic elimination type reactive power compensation component is specifically aimed at harmonics and power factor problems in the 0.4KV low-voltage distribution network, where the harmonic pollution is serious, to improve power factor, effectively suppress harmonics, reduce line loss and improve power quality.
The harmonic elimination reactive power compensation component includes: filter reactor and low-voltage filter power capacitor to form a filter compensation circuit. This series of components is a filter compensation equipment suitable for 0.4kV low-voltage distribution network. The series of compensation devices have complete protection measures and high degree of automation. They can automatically exit the work in case of external power failure and automatically resume operation after power is supplied.
LBT series dynamic switching unit
LBT series dynamic switching unit is a non-contact, high-reliability fast switching switch used in dynamic power factor compensation equipment. It is especially suitable for fast and wear-free switching occasions. Typical applications include hoisting equipment, pumps and welding machines and other occasions where reactive power changes frequently.
Through centralized reactive power compensation in the sewage treatment plant, the power factor of each transformer's incoming cabinet is increased to 0.98. The power consumption of the enterprise meets the reward requirements of the power supply department, which brings actual economic benefits to the enterprise. At the same time, installing reactive power compensation device can not only improve the power factor, save the active power, reduce line loss and transformer loss, reduce operating costs, but also improve the sewage treatment capacity of the sewage treatment plant, reduce the investment cost of sewage treatment equipment, reduce the voltage loss, improve the operation conditions, and and ensure the good and effective operation of the sewage treatment plant.
With the rapid development of China's economy, people's awareness of environmental protection is also constantly improving. The sewage treatment industry should also actively carry out energy-saving reforms, reduce production costs, save energy and better serve the people.
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