Single-phase-to-three-phase power supply system based on three-phase YNd transformer

A technology for power supply systems and transformers, applied in battery circuit devices, electrical components, circuit devices, etc., can solve problems such as loosening, emergency repair danger, and increased contact resistance, and achieve the effect of easy implementation and good versatility

A technology for power supply systems and transformers, applied in battery circuit devices, electrical components, circuit devices, etc., can solve problems such as loosening, emergency repair danger, and increased contact resistance, and achieve the effect of easy implementation and good versatility

CN110797870APending Publication Date: 2020-02-14YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Single-phase-to-three-phase power supply system based on three-phase YNd transformer
  • Single-phase-to-three-phase power supply system based on three-phase YNd transformer
  • Single-phase-to-three-phase power supply system based on three-phase YNd transformer

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Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 with figure 2 As shown, the embodiment of the present application provides a single-phase power-to-three-phase power supply system based on a three-phase YNd transformer, the system includes a transmission line L A , isolation transformer IT, power converter SC and three-phase YNd transformer T; the transmission line L A Connect respectively the P terminal of the input terminal of the isolation transformer IT and the A terminal of the three-phase YNd transformer T star winding; the M terminal and the N terminal of the output terminal of the isolation transformer IT are respectively connected with the R terminals, The S terminal is connected; the B terminal and the C terminal of the T star winding of the three-phase YNd transformer are respectively connected with the J terminal and the K terminal of the SC output end of the power converter; the a terminals, Terminal b and terminal c are connected to a low-voltage distribution network with a neutral po...

Embodiment 2

[0035] Such as Figure 4 As shown, the embodiment of the present application provides a single-phase power-to-three-phase power supply system based on a three-phase YNd transformer, the system includes a transmission line L A , isolation transformer IT, power converter SC and three-phase YNd transformer T; the transmission line L A Connect respectively the P terminal of the input terminal of the isolation transformer IT and the A terminal of the three-phase YNd transformer T star winding; the M terminal and the N terminal of the output terminal of the isolation transformer IT are respectively connected with the R terminals, The S terminal is connected; the B terminal and the C terminal of the T star winding of the three-phase YNd transformer are respectively connected with the J terminal and the K terminal of the SC output end of the power converter; the a terminals, Terminal b and terminal c are connected to a low-voltage distribution network with a neutral point grounded; w...

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Abstract

The invention discloses a single-phase-to-three-phase power supply system based on a three-phase YNd transformer. The system comprises a power transmission line, an isolation transformer, a power converter and a three-phase YNd transformer. The power transmission line is connected to a terminal P at the input end of the isolation transformer and a terminal A of a star-shaped winding of the three-phase YNd transformer. A terminal M and a terminal N at the output end of the isolation transformer are respectively connected with a terminal R and a terminal S at the input end of the power converter. A terminal B and a terminal C of the star-shaped winding of the three-phase YNd transformer are respectively connected with a terminal J and a terminal K at the output end of the power converter. Aterminal a, a terminal b and a terminal c of a triangular winding of the three-phase YNd transformer are connected with a low-voltage power distribution network with a grounded neutral point. A terminal Q of the isolation transformer and a terminal O at the center of the star-shaped winding of the three-phase YNd transformer are grounded. Therefore, single-phase power can be supplied to load operation needing three-phase power, and the system can be widely applicable to power distribution system transformation and fault repair.

Description

technical field [0001] The present application relates to the technical field of power distribution, in particular to a single-phase power-to-three-phase power supply system based on a three-phase YNd transformer. Background technique [0002] Users in the field of low-voltage power distribution in my country generally use single-phase power supply. When users need to use three-phase power, they need to re-erect power lines, which is very troublesome and takes a long time; Two-phase transmission lines and three-phase YNd transformers are connected to users, which is more economical and does not take up space, but some users need three-phase power. In particular, the user needs to use the 3-phase power supply for a short period of time due to special reasons, and the time for erecting a new three-phase line is not allowed. If the power quality of the grid allows, the three-phase power supply can be provided relatively easily, which will have a greater impact economic and soci...

Claims

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Application Information

Patent Timeline
14 Feb 2020
Publication
CN110797870A
IPC
H02J3/00; H02J3/28
CPC
H02J3/00; H02J3/28; H02J7/345
Inventors
郭成; 易东