Method used for adjusting three-phase unbalance of zone area

Abstract

The invention relates to a method used for adjusting three-phase unbalance of a zone area. According to the method, a three-phase balance adjustment concentrator is mounted beside a distribution part, and a tower pole having access wires is selectively equipped with multiple three-phase balance adjustment switches according to a load situation; the real-time data is analyzed and determined by the three phase balance adjustment concentrator, a distribution transform three-phase load unbalance degree reaches above 15% and continues five minutes, statistics of a combination result of all switch loads on a largest load phase is carried out, an unbalance degree after assumed phase change is calculated, an instruction is emitted to the corresponding switch on the largest load phase after optimal taking, loads are driven by the multiple three-phase balance adjustment switches to realize switching from present phases to target phases without power failure, and thereby three-phase automatic adjustment is realized. Through the method similar to a manual mode, work intensity of onsite workers can be effectively reduced, work efficiency is improved, line loss is reduced, great importance for prolongation of distribution transform service life is realized, and electrical appliances are made to realize safe and reliable operation.

Description

technical field [0001] The invention belongs to the field of low-voltage power distribution, and relates to three-phase load unbalance adjustment, in particular to a method for adjusting three-phase load unbalance in a station area. Background technique [0002] In the current low-voltage distribution network, most of the stations use three-phase transformers, but there are a large number of single-phase loads in the low-voltage distribution network. Imbalances exist objectively. In many cases, the unbalanced three-phase load is the main cause of line loss and endangering the life of the distribution transformer. Reasonable adjustment of three-phase load imbalance is of great significance for improving voltage quality, reducing line loss, and prolonging the life of distribution transformers, so as to ensure safe and reliable operation of electrical equipment. [0003] The three-phase load of the existing distribution transformer in the station area is unbalanced. Through t...

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Problems solved by technology

[0003] The three-phase load of the existing distribution transformer in the station area is unbalanced. Through the manual work, the load investigation and analysis should be strengthened. The load current should be tested frequently, and the phase sequence should be adjusted separately. Due to the irregularity of power consumption, the manual work intensity Large, the adjustment requires a power outage, which affects the reliability of power supply

[0004] The existing automatic adjustment of unbalanced three-phase loads of distribution transformers in the station area mainly relies on reactive power compensation devices or devices based on the principle of phase shifting to solve the problem. It does not actually solve the unbalanced three-phase load on the line in the station area. The work itself requires energy consumption, which increases the loss