Three-phase load transfer device

Abstract

The invention provides a three-phase load transfer device, comprising an input module, an input measurement module, a phase sequence adjustment module, a phase sequence display module and an output module, wherein the input module provides the input of the three-phase alternating current, and the input phase sequence of the three-phase alternating current is ABC; by measuring the levels of the current and the voltage of the three-phase alternating current which is input into the input module, the input measurement module judges whether the three-phase load is imbalanced or not; in order to provide three output phase sequences, namely ABC, BCA and CAB, the phase sequence adjustment module adopts three independent contactors for the three-phase current of which the input phase sequence is ABC; when the input measurement module detects the imbalance of the three-phase load by measurement, the operation of switching the output phase sequences is carried out, otherwise, outputting is carried out according to the original phase sequences; the phase sequence display module provides three indicator lights, and each indicator light corresponds to one of the three output phase sequences, namely the ABC, the BCA and the CAB, so as to display the current output phase sequence; and the output module outputs the three-phase alternating current into the load after the phase sequence adjustment module adjusts the phase sequences.

Description

【Technical field】 [0001] The invention relates to a low-voltage power distribution system, in particular to a three-phase load switching device capable of balancing and controlling three-phase output. 【Background technique】 [0002] For a long time, both at home and abroad, due to the unbalanced three-phase load of distribution transformers, there have been many problems in operation. The main manifestations are: uneconomical operation of transformers, high failure rate, frequent overheating and burning of individual contacts, even in residential areas In the factory area, due to large voltage changes in individual stations, transformers caused fires and other incidents. In addition, the unbalanced transformer load will also lead to problems such as increased line loss and reduced transformer utilization, and it will also pose a potential threat to the safe operation of electrical equipment and the personal safety of users. Therefore, maintaining the three-phase load balanc...

AI Technical Summary

Problems solved by technology

[0009] The above-mentioned solutions mainly seek to achieve the optimal configuration from the grid structure and management. However, these solutions all have a certain lag, and there is almost no response to changes brought about by emergencies and changes in the operation mode of the power grid. ability, therefore, none of the existing technologies can fundamentally solve the problem of unbalanced three-phase load in the low-voltage power distribution system

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