Three-phase load automatic balancing system in low voltage power supply area of transformer

Abstract

The invention discloses a three-phase load automatic balancing system in low voltage power supply area of transformer. The balancing system comprises a central controls and a phase changer. The central controller is arranged on the starting end of the branch while the phase changer is arranged at the terminal end of the branch and is connected with the load. The central controller and phase changer both adopt a three-phase four-wire method to be connected into the three-phase circuit; and communications are made between the phase changer and the central controller through power carriers. The three-phase load automatic balancing system in low voltage power supply area of transformer of the invention can effectively reduce the transformer loss and power line loss incurred from the imbalance of the three-phase load and overcomes the conditions with over-current at certain phase and low voltage at terminal end. In addition, since the system could switch phases automatically, power supply to the users does not have to be cut off. Consuming less power, the balancing system is also low in cost.

Description

technical field [0001] The invention relates to the field of electric power supply, in particular to an automatic three-phase load balancing system for a low-voltage station area transformer. Background technique [0002] At present, the problem of three-phase unbalance in my country's low-voltage distribution network is very common, with high loss, many defects, and poor operation reliability, threatening the safe operation of the power grid, especially the three-phase unbalance problem in rural power grids. The problem of unbalanced three-phase load has brought serious harm to the power system and user power supply, mainly in the following aspects: 1. Increased transformer loss; 2. Increased line loss; 3. Reduced output of distribution transformers, reducing 4. The transformer heats up, and even burns the transformer in severe cases; 5. It is easy to cause overvoltage and low voltage, which will affect the normal operation of electrical equipment. [0003] The traditional...

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Problems solved by technology

[0002] At present, the problem of three-phase unbalance in my country's low-voltage distribution network is very common, with high loss, many defects, and poor operation reliability, threatening the safe operation of the power grid, especially the three-phase unbalance problem in rural power grids.

The problem of unbalanced three-phase load has brought serious harm to the power system and user power supply, mainly in the following aspects: 1. Increased transformer loss; 2. Increased line loss; 3. Reduced output of distribution transformers, reducing The utilization rate of the distribution transformer is improved; 4. The transformer heats up, and even burns the transformer in severe cases; 5. It is easy to cause overvoltage and low voltage, which will affect the normal operation of electrical equipment

Although the automatic phase-changing device for low-voltage three-phase lines can achieve the purpose of self-service phase-changing, the automatic phase-changing device for low-voltage three-phase lines has large power consumption and high cost, and the communication between different branches mutual interference

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