CN212113430U

CN212113430U - Multi-split transformer for in-phase power supply

Info

Publication number: CN212113430U
Application number: CN202020811713.7U
Authority: CN
Inventors: 林云志; 张东东; 魏应东; 李增勤; 黄红志; 柴淑颖; 李晓新; 李笑倩; 刘啸辰; 沈卓轩
Original assignee: Tsinghua University; China Railway Electrification Engineering Group Co Ltd; China Railway Electric Industry Co Ltd
Current assignee: Tsinghua University; China Railway Electrification Engineering Group Co Ltd; China Railway Electric Industry Co Ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-12-08
Anticipated expiration: 2030-05-15

Abstract

The utility model discloses a cophase power supply uses many split transformers, including N group identical single phase transformer unit, N group single phase transformer unit locates in the same oil-immersed transformer box, each group single phase transformer unit is single post axial double split formation, forms the double post quadripartition structure, forms 4 x N split transformer; each group of single-phase transformer units is connected with the box body through a lead, and wiring terminals of a primary winding and a secondary winding of each group of single-phase transformer units are led out of the box body. Each group of single-phase transformer units in the multi-split transformer have small mutual influence and good decoupling effect; the half-crossing impedance errors corresponding to all secondary windings are small, and the rectification effect is good; the N groups of single-phase transformer units can be arranged in various forms, so that the overall assembly size is changed, and the installation requirements of various foundation sizes are met.

Description

Multi-split transformer for in-phase power supply

Technical Field

The utility model belongs to the technical field of pull power supply transformer, concretely relates to cophase power supply is with many split transformers.

Background

The traction power supply system of the high-speed and heavy-duty railway and the inter-city rapid rail transit in China adopts a single-phase alternating current + single-side power supply system, and is provided with an electric split-phase non-electricity area, so that the problems of increased traveling fault probability, reduced heavy-duty transportation efficiency and the like are caused. Meanwhile, the power supply system and the traction load operation mode cause a plurality of serious power quality problems and influence an external electric public network, and the problems of insufficient utilization of regenerative energy of a traction locomotive, low utilization rate of traction capacity and limited system reliability exist. Therefore, a multi-split transformer for in-phase power supply is urgently needed to solve the problem which always puzzles the technical personnel in the field in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a cophase power supply is with many split transformers, this cophase power supply is with many split transformers is applicable to single-phase AC-DC-AC's large capacity power conversion, and the rectification side is crisscross parallelly connected through many split rectifier transformers and is obtained good current harmonic characteristic, and the contravariant side obtains being close sinusoidal wave many level SPWM wave form, obtains good voltage harmonic characteristic and voltage transient state regulation characteristic.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a multi-split transformer for in-phase power supply is characterized in that: the transformer comprises N groups of completely same single-phase transformer units, wherein the N groups of single-phase transformer units are arranged in the same oil-immersed transformer box body, and each group of single-phase transformer units are formed by single-column axial double splitting to form a double-column four-split structure to form a 4 x N split transformer; each group of single-phase transformer units is connected with the box body through a lead, and wiring terminals of a primary winding and a secondary winding of each group of single-phase transformer units are led out of the box body.

Further preferably, the N groups of single-phase transformer units are disposed in the same dry-type transformer box exposed in the air.

Further preferably, the primary windings of the N groups of single-phase transformer units are connected in parallel and then lead out a head-to-tail outlet terminal A, X, and the secondary windings respectively and independently lead out a head-to-tail terminal a1, x1, a2, x2 … … a16 and x16 … ….

Further preferably, the N groups of single-phase transformer units may be symmetrically arranged in two rows.

Further preferably, the N groups of single-phase transformer units may be arranged in a row.

The utility model has the advantages that:

each group of single-phase transformer units adopts a single-column axial double-split structure to form a double-column four-split structure, the mutual influence is small, and the decoupling effect is good; the secondary windings of the N groups of completely same single-phase transformer units are symmetrical in relative position, the corresponding half-crossing impedance error is small, and the rectification effect is good after the single-phase transformer units pass through the rectification device; the N groups of identical single-phase transformer units can be arranged in various forms, so that the overall assembly size is changed, and the installation requirements of various foundation sizes are met.

Drawings

Fig. 1 is the utility model provides a sixteen split transformers wiring schematic diagram.

Fig. 2 is the utility model discloses well every group single-phase transformer unit structure schematic diagram.

Fig. 3 is a first arrangement scheme of four sets of transformer units in a sixteen-split transformer.

Fig. 4 is a second arrangement scheme of four sets of transformer units in a sixteen-split transformer.

Fig. 5 is a third arrangement scheme of four sets of transformer units in a sixteen-split transformer.

In the figure, 1, a single-phase transformer unit I; 2. a single-phase transformer unit II; 3. a single-phase transformer unit III; 4. a single-phase transformer unit four; 5. a primary winding; 6. a secondary winding; 7. and a transformer box body.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, the embodiment includes a single-phase transformer unit i 1, a single-phase transformer unit ii 2, a single-phase transformer unit iii 3, a single-phase transformer unit iv 4, and a transformer box 7, where the four single-phase transformer units are disposed in the same transformer box 7, and the transformer box 7 may be an oil-immersed transformer box or a dry-type transformer box exposed in air; the single-phase transformer unit I1, the single-phase transformer unit II 2, the single-phase transformer unit III 3 and the single-phase transformer unit IV 4 are all formed by single-column axial double splitting, and each group of single-phase transformer units are in a single-column axial double splitting structure to form a double-column four-splitting structure to form a sixteen-split transformer; each group of single-phase transformer units is connected with a transformer box body 7 through a lead, and wiring terminals of a primary winding and a secondary winding of each group of single-phase transformer units are led out from the transformer box body 7.

In the embodiment, primary windings of the single-phase transformer unit one 1, the single-phase transformer unit two 2, the single-phase transformer unit three 3 and the single-phase transformer unit four 4 are connected in parallel and then lead out a head-tail outlet terminal A, X, and secondary windings are respectively and independently led out a head-tail terminal a1, x1, a2, x2 … … a16 and x 16.

Each group of single-phase transformer units comprises an iron core, four primary windings and four secondary windings. The iron core comprises two core columns, two primary windings and two secondary windings are symmetrically arranged on each core column, the arrangement sequence can be the sequence of the core column, the secondary windings and the primary windings or the sequence of the core column, the primary windings and the secondary windings according to actual requirements, the arrangement of the windings of the two core columns is completely consistent, each secondary winding is symmetrical relative to the structure of the parallel primary windings, and the equivalent leakage inductance of each secondary winding is basically equal.

In addition, the present embodiment provides three arrangement schemes of four groups of single-phase transformer units of the sixteen-split transformer, which are respectively an arrangement scheme of four groups of transformer units, i.e., two rows and two columns are symmetrically arranged, an arrangement scheme of four groups of transformer units, i.e., one row and four units are arranged in parallel, an arrangement scheme of four groups of transformer units, i.e., one row and four units are arranged in a straight line, and the four groups of single-phase transformer units can be variously combined and arranged in the transformer box 7, so that the overall assembly size is changed, and the installation requirements of various foundation sizes are met.

The embodiment is only an illustration of the concept and implementation of the present invention, and is not a limitation, and the technical solution without substantial transformation is still within the protection scope under the concept of the present invention.

Claims

1. A multi-split transformer for in-phase power supply is characterized in that: the transformer comprises N groups of completely same single-phase transformer units, wherein the N groups of single-phase transformer units are arranged in the same oil-immersed transformer box body, and each group of single-phase transformer units are formed by single-column axial double splitting to form a double-column four-split structure to form a 4 x N split transformer; each group of single-phase transformer units is connected with the box body through a lead, and wiring terminals of a primary winding and a secondary winding of each group of single-phase transformer units are led out of the box body.

2. The multi-split co-phase power supply transformer of claim 1, wherein: the N groups of single-phase transformer units are arranged in the same dry-type transformer box body exposed in the air.

3. The multi-split co-phase power supply transformer of claim 1, wherein: the primary windings of the N groups of single-phase transformer units are connected in parallel and then lead out a head-tail outlet terminal A, X, and the secondary windings are respectively and independently led out a head-tail terminal a1, an x1, an a2, an x2 … … a16 and an x16 … ….

4. The multi-split co-phase power supply transformer of claim 1, wherein: the N groups of single-phase transformer units may be symmetrically arranged in two rows.

5. The multi-split co-phase power supply transformer of claim 1, wherein: the N groups of single-phase transformer units may be arranged in a row.