Low voltage monitoring and three-phase load balance automatic adjustment system

Abstract

The invention discloses a low voltage monitoring and three-phase load balance automatic adjustment system. A concentrator carries out operation analysis on the power parameter data of the output end of a branch transformer and the power parameter data of a terminal load. Some phase change switches are optimally selected. The system automatically carries out appropriate phase switching on the phasechange switches. An air switch is always free of phase switching. Through automatic adjustment, a low-voltage power distribution side automatically keeps a balance state. The loss of a line and the branch transformer is reduced. The service lives of the line and the branch transformer are improved. The power supply quality is improved. The concentrator can communicate the power parameter data ofthe output end of the branch transformer and the power parameter data of the terminal load with a central computer through a power carrier wireless network, so as to realize power monitoring and remote optimization control. Cumbersome work links during the adjustment of the load balance of the line are reduced. The work intensity is reduced. A worker simply needs to carry out system operation to realize load adjustment. The work efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of power three-phase load balance adjustment, in particular to a low-voltage monitoring and three-phase load balance automatic adjustment system. Background technique [0002] Today, with the rapid development of science and the progress of the times, in the modern power grid system, the three-phase unbalance problem caused by a large number of impact asymmetric loads has caused great harm to the safe and stable operation of the distribution network, seriously affecting the power supply power of the system. Quality, my country's low-voltage distribution network basically adopts the three-phase four-wire distribution network method, almost all distribution transformers... 60% to 70%, some even reach more than 70%, seriously affecting the normal supply of electric energy, Three-phase unbalance is also very common in all low-voltage distribution networks such as residential areas, industrial and mining, and enter...

AI Technical Summary

Problems solved by technology

The second is to use the method of cross-switching to reasonably distribute the asymmetrical load to each phase, and try to make it as balanced as possible; the third is to increase the short-circuit capacity of the load access point, such as changing the network or increasing the power supply voltage level, so as to enhance the system's ability to withstand unbalanced loads. The fourth is to install a reactive power compensation and balancing device; the first three mainly rely on manual balancing, and can only maintain a relative balance at a certain time node. The reactive power compensation and balancing device is based on power factor and reactive power. Controlled, this method can only make the three-phase balance at the distribution end

Unable to improve the loss problem on the low-voltage side outgoing line

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