CN202711923U

CN202711923U - High-voltage coil structure of dry type transformer cast by epoxy resin

Info

Publication number: CN202711923U
Application number: CN 201220378063
Authority: CN
Inventors: 莫志慧; 吴国伟; 徐成杰
Original assignee: SUZHOU XINGZHOU TRANSFORMER CO Ltd
Current assignee: SUZHOU XINGZHOU TRANSFORMER CO Ltd
Priority date: 2012-08-01
Filing date: 2012-08-01
Publication date: 2013-01-30
Anticipated expiration: 2022-08-01

Abstract

A high-voltage coil structure of a dry type transformer cast by epoxy resin comprises a first sectional coil and a second sectional coil which are sequentially arranged on the same axial direction, wherein the first sectional coil is separated from the second sectional coil by a first section-to-section insulator; the wire head of the first sectional coil and the wire head of the second sectional coil are connected at the inner edge part of the first section-to-section insulator and used as winding start points. The structure is characterized in that the cross section of the first section-to-section insulator is a trapezoid with a narrow inner side and a wide outer side. According to the utility model, the wire head of the first sectional coil and the wire head of the second sectional coil are connected at the inner edge part of the section-to-section insulator and used as the winding start points, so that the field intensity of the inner side of the section-to-section insulator is low, the field intensity of the outer side is high; and the cross section of the first section-to-section insulator is designed into the trapezoid with the narrow inner side and the wide outer side, thereby effectively utilizing the internal space of the coil, improving the filling coefficient of the wire and saving materials under the condition of ensuring the section-to-section electric strength of the coil.

Description

A kind of Cast Resin Dry-Type Transformer high-voltage coil structure

Technical field

The utility model relates to transformer, is specifically related to a kind of high-voltage coil structure of Cast Resin Dry-Type Transformer.

Background technology

Cast Resin Dry-Type Transformer is the technique by casting epoxy resin, the transformer of the coil encapsulation of transformer being lived to insulate with epoxy resin.

The high-tension coil of Cast Resin Dry-Type Transformer (also can be described as the high pressure winding) generally adopts the layer coil structure, and when the number of plies one timing, the number of turn of each layer increases, and voltage between layers improves, and so just causes layer insulation to increase, and the radial size of winding increases.In order to improve this situation, high-tension coil adopts the segmental layered coil structure.Existing segmented layered high-voltage coil structure, whole coil is divided into first paragraph coil 1, second segment coil 2, the 3rd section coil 3 and the 4th section coil 4, these four sections coils as shown in Figure 1, a section spaced apart in the axial direction, section with intersegmental be section insulation 5, this section insulation 5 is that poured with epoxy resin filling forms.And as shown in Figure 1, the cross sectional shape of section insulation 5 is rectangle, and namely the internal layer b point place of section insulation 5 and outer a point place are equidistant.Have the coiling schematic diagram of whole high-tension coil now as shown in Figure 2, its first paragraph coil 1 links to each other with second segment coil 2, and begins coiling with its connecting place b point as starting point; Its 3rd section coil 3 also links to each other with the 4th section coil 4, begins coiling with its connecting place b point as starting point too.After coiling was good, the target a of institute in the accompanying drawing 2, b, c, d point were over against a that should be arranged in accompanying drawing 1, b, c, d point place.

From accompanying drawing 2, we can find out that a point place is not identical with b point place field intensity, and a point place field intensity is maximum, and b point place field intensity is zero, and electric field is along the radial linear distribution that is of coil.Because the internal layer b point place of the section insulation 5 of existing high-tension coil and outer a point place distance equate, in order to guarantee the electrical strength between coil segment, what mainly consider when design is the field intensity at a point place, therefore whole section insulation 5(is intersegmental distance) all need design widelyr, namely in the suspicion that waste is arranged near its intersegmental distance of internal layer b point place, the activity coefficient that is wire is lower, and material consumption is larger.

Summary of the invention

The utility model purpose provides a kind of Cast Resin Dry-Type Transformer high-voltage coil structure, and is lower because of the activity coefficient of the equidistant wire that causes inside and outside the section insulation to solve existing high-tension coil, the problem that material consumption is larger.

For achieving the above object, the technical solution adopted in the utility model is: a kind of Cast Resin Dry-Type Transformer high-voltage coil structure, comprise same first paragraph coil and the second segment coil of arranging successively on axially, between first paragraph coil and the second segment coil every being provided with the first section insulation; The wire head of first paragraph coil is connected wire head in the connection of the inner edge place of the first section insulation and as the coiling starting point with the second segment coil; The cross section of described the first section insulation is wide trapezoidal in the inboard narrow outside.

Technique scheme comprises following variation and further scheme:

1, in the such scheme, also comprise the 3rd section coil and the 4th section coil of arranging successively, between the 3rd section coil and the second segment coil every being provided with the second section insulation, every being provided with the 3rd section insulation, the wire head of the wire head of the 3rd section coil and the 4th section coil connects at the inner edge place of the 3rd section insulation and as the coiling starting point between the 3rd section coil and the 4th section coil; The cross section of described the 3rd section insulation also is wide trapezoidal in the inboard narrow outside.

2, in the such scheme, the cross section of described the second section insulation is rectangle.

The utility model design principle and effect are:

The utility model considers that the wire head of the wire head of first paragraph coil and second segment coil links to each other at the inner edge place of its section insulation and as the coiling starting point, therefore the field intensity of the inboard of this section insulation is low, and outside field intensity, so be wide trapezoidal in the inboard narrow outside with the Cross section Design of section insulation, thereby under the condition that guarantees electrical strength between coil segment, effectively utilize the coil inside space, improved the activity coefficient of wire, saved material.

Description of drawings

Accompanying drawing 1 partly cuts open schematic diagram for existing high-voltage coil structure;

Accompanying drawing 2 is the coiling schematic diagram of the utility model embodiment loop construction for the coiling schematic diagram of existing high-voltage coil structure too;

Accompanying drawing 3 is for being that the utility model embodiment high-voltage coil structure partly cuts open schematic diagram.

In the above accompanying drawing: 1, first paragraph coil; 2, second segment coil; 3, the 3rd section coil; 4, the 4th section coil; 5, section insulation; 5a, the first section insulation; 5b, the second section insulation; 5c, the 3rd section insulation.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment: shown in accompanying

drawing

2,3,

A kind of Cast Resin Dry-Type Transformer high-voltage coil structure comprises same first paragraph coil 1, second segment coil 2, the 3rd section coil 3 and the 4th section coil 4 of arranging successively on axially.See shown in the accompanying drawing 3, between first paragraph coil 1 and the second segment coil 2 every being provided with the first section insulation 5a, between second segment coil 2 and the 3rd section coil 3 every being provided with the second section insulation 5b, between the 3rd section coil 3 and the 4th section coil 4 every being provided with the 3rd section insulation 5c.

Shown in accompanying drawing 2 and accompanying drawing 3, the wire head that the wire head of first paragraph coil 1 is connected with the second segment coil is in (i.e. the upper b place of the figure) connection of the inner edge place of the first section insulation 5a and as the coiling starting point; The wire head of the wire head of the 3rd section coil 3 and the 4th section coil 4 is in (i.e. the upper b place of the figure) connection of the inner edge place of the 3rd section insulation 5c and as the coiling starting point.

As shown in Figure 3, the cross section of described the first section insulation 5a is wide trapezoidal in the inboard narrow outside, and the cross section of the 3rd section insulation 5c also is wide trapezoidal in the inboard narrow outside.And for the convenience of coiling, the cross section of the second section insulation 5b still is rectangle.

What above-described embodiment was mentioned comprises that four sections coils are to illustrate, and actual mesohigh coil can only comprise two sections coils, also can comprise the coil more than four sections.

Above-described embodiment only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with technique can understand content of the present utility model and according to this enforcement, can not limit protection range of the present utility model with this.All equivalences of doing according to the utility model Spirit Essence change or modify, and all should be encompassed within the protection range of the present utility model.

Claims

1. Cast Resin Dry-Type Transformer high-voltage coil structure comprises same first paragraph coil and the second segment coil of arranging successively on axially, between first paragraph coil and the second segment coil every being provided with the first section insulation; The wire head of first paragraph coil is connected wire head in the connection of the inner edge place of the first section insulation and as the coiling starting point with the second segment coil; It is characterized in that: the cross section of described the first section insulation is wide trapezoidal in the inboard narrow outside.

2. Cast Resin Dry-Type Transformer high-voltage coil structure according to claim 1, it is characterized in that: also comprise the 3rd section coil and the 4th section coil of arranging successively, between the 3rd section coil and the second segment coil every being provided with the second section insulation, every being provided with the 3rd section insulation, the wire head of the wire head of the 3rd section coil and the 4th section coil connects at the inner edge place of the 3rd section insulation and as the coiling starting point between the 3rd section coil and the 4th section coil; The cross section of described the 3rd section insulation also is wide trapezoidal in the inboard narrow outside.

3. Cast Resin Dry-Type Transformer high-voltage coil structure according to claim 1, it is characterized in that: the cross section of described the second section insulation is rectangle.