Single-phase/two-phase-to-three-phase power supply structure

Abstract

The invention discloses a single-phase / two-phase-to-three-phase power supply structure, and belongs to the technical field of power supply and distribution of a power grid. The structure comprises a power transmission line, a power converter and a single-phase combined transformer. A three-phase port of the single-phase combined transformer serves as an output port to provide a three-phase power supply for users, and the input end of the power converter is connected with the power transmission line. The single-phase combined transformer is formed by connecting a first single-phase transformerand a second single-phase transformer through the power converter, the input side of the first single-phase transformer in the single-phase combined transformer is connected with the power transmission line, and the input end of the second single-phase transformer in the single-phase combined transformer is connected with the output end of the power converter. According to the invention, a three-phase power supply can be provided for users through a single-phase wire and a two-phase power transmission line, and the structure can be widely applied to power distribution system transformation andfault repair.

Description

technical field [0001] The invention relates to the technical field of electric power supply and distribution. Background technique [0002] In the AC power supply mode of the power system, the three-phase AC power supply system is widely used. In the field of low-voltage power distribution in my country, single-phase transmission lines are generally used to provide users with electrical energy. In some areas, users are geographically dispersed, and two-phase transmission lines are also used to provide electrical energy to users. When users who only access single-phase or two-phase transmission lines need to use three-phase power supply, according to the existing technology, only three-phase transmission lines can be re-erected to provide users with three-phase power supply, which takes a long time, high cost and low economy . [0003] At the same time, because the transmission lines are generally erected outdoors, the geographical span is wide, and the environmental condi...

AI Technical Summary

Problems solved by technology

When users who only access single-phase or two-phase transmission lines need to use three-phase power supply, according to the existing technology, only three-phase transmission lines can be re-erected to provide users with three-phase power supply, which takes a long time, high cost and low economy

[0003]At the same time, because the transmission line is generally erected outdoors, the geographical span is wide, and the environmental conditions are changeable. Due to the long-term mechanical force, electromagnetic force, thermal effect and severe oxidation , poor contact and other reasons, resulting in various disconnection faults, so that the equipment cannot operate normally

When the original three-phase transmission line has one or two phase disconnection faults due to external reasons, the three-phase power supply mode becomes a non-three-phase power supply mode, so that it cannot provide users with the three-phase power they need

Existing solutions can only provide three-phase power in a short period of time through economical repairs by electric maintenance personnel. However, emergency repairs in bad weather are very dangerous, and the personal safety of electric maintenance personnel is difficult to be guaranteed.

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