CN213815760U

CN213815760U - Four-split transformer

Info

Publication number: CN213815760U
Application number: CN202022483063.0U
Authority: CN
Inventors: 伊丽莎; 陈瑞虹; 刘海东; 郭新; 李广镇
Original assignee: Jinan Xd Special Transformer Co ltd; China XD Electric Co Ltd
Current assignee: Jinan Xd Special Transformer Co ltd; China XD Electric Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-07-27
Anticipated expiration: 2030-10-30

Abstract

The utility model provides a quadripartion transformer, including iron core and coil, wherein, the coil is three-phase coil, and the iron core comprises three iron core post, and every phase coil outside-in is equipped with high-voltage coil and low voltage coil in proper order, and the iron core post that every phase coil corresponds is equipped with two sets of windings along the axial direction, and high-voltage coil is two sets of axial split, and low voltage coil is two sets of axial split, and every group includes two low voltage coil to the split. The four-split transformer has the advantages that the high-voltage coil is axially split, the low-voltage coil adopts a structure combining axial splitting and radial splitting, the structure is simple, the use is convenient, 4 groups of secondary coils can be simultaneously output by one transformer, the installation space is saved, the transportation cost is reduced, the defect that the height of the transformer with single axial splitting is too high and the defect that the 1/4 through impedance of the four groups of coils has too large difference are overcome, and the stable operation of a battery energy storage system is ensured.

Description

Four-split transformer

Technical Field

The utility model belongs to the technical field of the transformer, in particular to quadripartion transformer.

Background

In recent years, with the rapid development of new energy industry, the energy storage market also has come to explosive development as its subsidiary industry, and in fact, no matter photovoltaic, wind power, hydroelectric power or other renewable energy sources, or traditional power grid or internal combustion engine distributed energy sources, the energy storage battery industry also becomes the strategic hub of energy revolution without the support of energy storage technology.

A split winding transformer refers to a multi-winding power transformer in which each phase is composed of one high-voltage winding and two or more low-voltage windings with the same voltage and capacity. At present, the height of a transformer which is simply axially split is too high, the requirement on height space is high, and the 1/4 through impedance of four groups of coils has too large difference, so that the instability of a battery energy storage system is easily caused.

Therefore, how to design a transformer with reasonable installation space and capable of ensuring stable operation of a battery energy storage system is an urgent problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a four-split transformer, installation space is reasonable, and has guaranteed battery energy storage system steady operation.

In order to solve the technical problem, the utility model provides a four-split transformer, including iron core and coil, the coil is three-phase coil, the iron core comprises three iron core post, each phase the coil is equipped with high-voltage coil and low-voltage coil from outside to inside in proper order, high-voltage coil is two sets of that axially splits, low-voltage coil is two sets of that axially splits and each set includes two low-voltage coils that radially split;

every two of every group the low-voltage coil of amplitude splitting twine into an organic whole, every two of every group the low-voltage coil of amplitude splitting include from interior to exterior three-layer, partial first coil, second coil and the first coil of the remaining part, the every group of axial division the low-voltage coil be in two sides are qualified for the next round of competitions around the four-split transformer, first coil has four outgoing lines to arrange and is qualified for the next round of competitions and be close to two in the middle at the transformer low pressure side outgoing lines row and connect with the copper, the second coil has two outgoing lines to arrange and is qualified for the next round of competitions at the transformer high-pressure side.

Preferably, in the four-split transformer, the outlet row of the coil located at the upper side is fixedly connected by a bracket and an upper clamp.

Preferably, in the four-split transformer, the outlet row of the coil located at the lower side is fixed to the support frame.

Preferably, in the four-split transformer, the high-voltage coil is connected in a star connection manner, and the low-voltage coil is connected in a delta connection manner.

Preferably, in the above-described four-split transformer, the four-split transformer is an epoxy cast four-split transformer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a front view of a four-split transformer according to the present solution;

fig. 2 is a side view of a four-split transformer provided by the present solution;

fig. 3 is a diagram of a coil arrangement provided in the present embodiment.

In the upper diagram:

1. the transformer comprises an iron core, 2, a coil, 3, a support frame, 4, a high-voltage terminal, 5, a low-voltage terminal, 6, a first high-voltage coil, 7, a second high-voltage coil, 8, a first low-voltage coil, 9, a second low-voltage coil, 10, a third low-voltage coil, 11 and a fourth low-voltage coil.

Detailed Description

The core of the utility model is to provide a four-split transformer, installation space is reasonable, and has guaranteed battery energy storage system steady operation.

In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1-3, the present invention provides a four-split transformer, which includes an iron core 1 and a coil 2, wherein the coil 2 is a three-phase coil, the iron core 1 is composed of three iron core columns, each phase of coil 2 is sequentially provided with a high voltage coil and a low voltage coil from outside to inside, the iron core column corresponding to each phase of coil 2 is provided with two sets of windings along the axial direction, the high voltage coil is two sets of axial split, the low voltage coil is two sets of axial split, and each set includes two low voltage coils of radial split.

It should be noted that the coil assembly has four independent windings, the high-voltage coil is axially split into two coils, the low-voltage coil is axially split into two groups, and each group of two low-voltage coils are radially split. The upper and lower groups of windings are similar in structure size and convenient and stable in assembly.

The present case provides a four-split transformer, high-voltage coil axial splitting, low-voltage coil use axial splitting and the structure that the radial splitting combined together, simple structure, convenient to use can realize that a transformer exports 4 groups ' secondary coil simultaneously, has saved installation space moreover, has reduced the cost of transportation, has overcome the shortcoming that the transformer height of simple axial splitting is too high and the 1/4 of four group's coils passes through the too big shortcoming of impedance difference, has guaranteed battery energy storage system's steady operation.

In a specific embodiment, each set of two radially split low voltage coils is wound as a single body. Each group of two radially split low-voltage coils comprises three layers from inside to outside, namely a part of the first coil, a second coil and the rest part of the first coil. Specifically, a portion of one coil is wound first, then a second coil is wound, and finally the first coil is wound. This ensures that the four low voltage coils have the same impedance to the high voltage coil.

For convenient wiring, the two coils are divided into two side coils for outgoing wires, the first coil is provided with four outgoing wire rows which are outgoing wires at the low-voltage side of the transformer, the two outgoing wire rows close to the middle of the transformer are connected by a copper plate, and the second coil is provided with two outgoing wires which are arranged at the high-voltage side of the transformer.

In a specific embodiment, the high-voltage coil adopts a star connection method, which is also called a Y-connection method, so that the load balance is not damaged. The axial split is two coils, each high-voltage coil corresponds to two low-voltage coils, and the two high-voltage coils run in parallel. As shown in figure 1, a high-voltage terminal 4 is adopted to be connected with a high-voltage coil, two groups of ABC terminals are connected in parallel by three copper plates, and a leading-out terminal hole is formed in the straight copper plate and used for connecting wires of a user.

The low-voltage coil adopts a delta connection method and has small resistance.

And the wire outlet row of the coil 2 positioned at the top is fixedly connected with the upper clamping piece through a bracket. The coil 2 is positioned on the outlet row at the bottom and fixed on the support frame 3. The transformer base is provided with a channel steel supporting seat, and the lower outlet row is fixed on the channel steel supporting seat.

As shown in fig. 1 to 3, the specific connection relationship is as follows:

the high-voltage coil is split into two coils along the axial direction of the iron core 1 by adopting a Y connection method, the upper part is a first high-voltage coil 6, the lower part is a second high-voltage coil 7, the first high-voltage coil 6 and the second high-voltage coil 7 run in parallel, three ABC terminals in an upper group and a lower group are connected in parallel by three high-voltage terminals 4 respectively and then output.

The low-voltage coil adopts the mode that axial splitting and radial splitting are combined, the low-voltage coil is split into two groups of coils along the axial direction of the iron core 1, the upper side low-voltage coil group is a first low-voltage coil 8 and a second low-voltage coil 9, and the two low-voltage coils are split in the radial direction. Each group of two radially split low-voltage coils are wound into a whole, a part of the first low-voltage coil 8 is wound, then the second low-voltage coil 9 is wound, and finally the rest part of the first low-voltage coil 8 is wound. The lower low-voltage coil component is a third low-voltage coil 10 and a fourth low-voltage coil 11, and the winding method is the same as that of the first low-voltage coil 8 and the second low-voltage coil 9. This ensures that the four low voltage coils have the same impedance to the high voltage coil. And part of windings of the low-voltage coil adopt a mode of combining axial splitting and radial splitting, so that the height of the iron core can be greatly reduced, and the problems of large axial force and serious transverse magnetic flux leakage of the axially split low-voltage winding during short circuit are partially solved.

In a specific embodiment, each axially split group of low-voltage coils is led out from the front side and the rear side of the four-split transformer. The outlet wire is discharged as the low-voltage terminal 5. The first low-voltage coil 8 and the third low-voltage coil 10 are both provided with four outlet lines, the two outlet lines which are led out from the low-voltage side of the transformer and are close to the middle are connected through a copper plate, the four outlet lines of the first low-voltage coil 8 are positioned at the upper left corner in the drawing 2, and the four outlet lines of the third low-voltage coil 10 are positioned at the lower left corner in the drawing 2. The second low-voltage coil 9 and the fourth low-voltage coil 11 both have two outlet rows, and the outlet rows are arranged on the high-voltage side of the transformer, the outlet row of the second low-voltage coil 9 is positioned on the upper right side of fig. 2, and the outlet row of the fourth low-voltage coil 11 is positioned on the lower right side of fig. 2. And the wire outlet row on the upper side of the transformer is fixedly connected with the upper iron core clamping bracket through a bracket. The transformer base is provided with a channel steel supporting seat, and the lower side outlet row is fixed on the channel steel supporting seat.

Specifically, the four-split transformer is an epoxy cast four-split transformer, and the coil 2 is manufactured by adopting an epoxy casting process. Epoxy resin casting is a process of casting epoxy resin, curing agent and other batch materials into a mold, and crosslinking and curing the epoxy resin, curing agent and other batch materials into a thermosetting product by a thermoplastic fluid. The epoxy cast four-split transformer integrates excellent electrical property and mechanical property.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A four-split transformer comprises an iron core (1) and coils (2), and is characterized in that the coils (2) are three-phase coils, the iron core (1) is composed of three iron core columns, each phase of the coils (2) is sequentially provided with a high-voltage coil and a low-voltage coil from outside to inside, the high-voltage coils are axially split, the low-voltage coils are axially split and each group comprises two radially split low-voltage coils;

2. The four-split transformer according to claim 1, wherein the outlet row of the coil (2) on the upper side is fixed by a bracket and an upper clip connection.

3. The four-split transformer according to claim 1, wherein the lower outlet row of the coils (2) is fixed to a support frame (3).

4. The four-split transformer according to claim 1, wherein the high-voltage winding is star-connected and the low-voltage winding is delta-connected.

5. The quad-split transformer according to claim 1, wherein the quad-split transformer is an epoxy cast quad-split transformer.