Multifunctional automatic phase change system and phase change method for medium and low voltage lines

Abstract

The invention discloses a multifunctional automatic phase change system and a phase change method for medium and low voltage lines. The phase commutation system includes a main control module and a plurality of execution modules, and each execution module corresponds to multiple users connected in parallel. The main control module includes a main controller and a three-phase current sampling unit, and each execution module includes an electronic phase change switch, and the electronic phase change switch selects the three phases of power supply of the transformer according to the switching command A phase corresponding to the command supplies power to multiple users corresponding to the execution module. The present invention divides the lines of the distribution station area by setting a main control module and an execution module, and controls a plurality of execution modules to switch the three phases of each line through the main control module set at the distribution transformer end, so that all lines after switching The three-phase power load tends to be balanced, thereby improving the unbalance of the three phases, reducing the line loss in the distribution area, ensuring the power quality of users, and realizing the purpose of saving energy and reducing electricity prices.

Description

technical field

[0001] The invention relates to an automatic phase change system and a phase change method thereof in the technical field of smart grids, in particular to a multifunctional automatic phase change system and a phase change method for medium and low voltage lines. Background technique

[0002] Three-phase load balance is the basis of safe power supply, and unbalanced three-phase load will reduce the power supply efficiency of lines and distribution transformers if it is light, or it will cause a certain phase wire to burn out and a switch to burn out due to heavy load phase overload , and even serious consequences such as single-phase burnout of distribution transformers. Therefore, only the three-phase impedance balance can ensure the good operation of the low-voltage leakage protection and prevent personal electric shock casualties, and only the three-phase load balance can ensure the user's power quality. The balance of the three-phase load is also the basi...

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