Single-phase/two-phase-to-three-phase power supply structure utilizing YNvd transformer

Abstract

The invention discloses a single-phase / two-phase-to-three-phase power supply structure utilizing an YNvd transformer, and relates to the technical field of power supply and distribution of a power grid. The structure comprises a power transmission line, an YNvd transformer and a three-phase static var generator. The power transmission line is connected with the YNvd transformer. When the power transmission line is a single-phase power transmission line, the power transmission line is connected with a terminal P in the input end of the three-phase static var generator and a terminal A in the YNvd transformer, a terminal K in the YNvd transformer is grounded, a terminal N of the three-phase static var generator is also grounded GND, a terminal B and a terminal C of the YNvd transformer are connected with a terminal M and a terminal N in the output end of the three-phase static var generator respectively, and a phase a, a phase b and a phase c of the output port of the YNvd transformer provide a three-phase power supply for users.

Description

technical field [0001] The invention relates to the technical field of electric power grid 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 environm...

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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