CN214152665U

CN214152665U - Dry-type transformer with iron core insulation structure

Info

Publication number: CN214152665U
Application number: CN202120061877.7U
Authority: CN
Inventors: 姜永军; 王梅玲; 陈国富
Original assignee: Zhongjun Intelligent Quanzhou Co ltd
Current assignee: Zhongjun Intelligent Quanzhou Co ltd
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2021-09-07
Anticipated expiration: 2031-01-11

Abstract

The utility model discloses a dry-type transformer with an iron core insulation structure, which comprises an iron core hold-down mechanism and an iron core column, wherein the iron core hold-down mechanism comprises an upper clamping piece, a lower clamping piece and pulling plates, the two sides of the iron core column are respectively provided with the pulling plates, the lower end of each pulling plate is arranged on the lower clamping piece, and the upper end of each pulling plate is arranged on the upper clamping piece; the outer of each pulling plate is respectively sleeved with a heat-shrinkable sleeve which shrinks after being heated, two ends of each heat-shrinkable sleeve respectively extend to two ends close to the corresponding pulling plate, the outer of the iron core column and the pulling plate are jointly wound with resin prepreg cloth which is used for resin to seep and solidify after being heated, the resin prepreg cloth is wound for more than one circle, and each heat-shrinkable sleeve is respectively clamped between the resin prepreg cloth and the pulling plate. Compared with the prior art, adopt pyrocondensation cover and resin preimpregnation cloth setting, strengthened the insulation of iron core post, make the whole insulation of iron core post reach high resistance value, and stability is high.

Description

Dry-type transformer with iron core insulation structure

Technical Field

The utility model relates to an iron core insulation system, more specifically say and relate to a dry-type transformer with iron core insulation system.

Background

The dry type transformer mainly comprises an iron core column, a winding, a transformer body insulation and an iron core pressing mechanism, wherein the iron core column is an iron core silicon steel sheet lamination formed by silicon steel sheets, and the commonly used iron core pressing mechanism is a pull plate type iron core pressing mechanism which is used for connecting iron cores into a whole, pressing the winding, bearing the gravity of the transformer body when the dry type transformer is lifted and bearing the mechanical force generated by the winding when the dry type transformer is in short circuit.

At present, an iron core pressing mechanism of a commonly used dry-type transformer is shown in fig. 1, and includes a pulling plate 10, an upper clamping piece 11 and a lower clamping piece 12, where the pulling plate 10 is a T-shaped plate, and the pulling plate is fixed on the surface of an iron core column 20, and its lower end is connected with the lower clamping piece 12 fixed on an iron core lower yoke, the upper clamping piece 11 is two upper channel steels arranged back to back, the two upper channel steels are clamped on two sides of the iron core upper yoke through yoke screws, and vertical surfaces of the two upper channel steels are respectively provided with notches adapted to upper ends of the pulling plate 10; the lower clamping piece 12 is two lower channel steels arranged back to back, the two lower channel steels are clamped on two sides of the iron core lower iron yoke through iron yoke screw rods, and the lower clamping piece 12 is connected with the lower end of the pulling plate 10 through round steel. Thus, the upper and

lower clip members

11 and 12 are connected together by the pulling plate 10, and the pulling plate 10, the upper and

lower clip members

11 and 12 form a frame and the core limb 20 is integrated. In the existing dry-type transformer, the core column 20 needs to be insulated and isolated to ensure that the insulation resistance value of the core to the ground and the insulation resistance value of the core to the ground do not meet the standard requirement, the core column 20 adopts the pulling plate to carry out the pulling plate insulation at present, however, the insulation effect of the pulling plate insulation is unstable, and is easily influenced by environmental factors, such as the influence of air humidity, the insulation effect of the core column 20 to the ground is often influenced by the left and right resistance of the core column 20.

Accordingly, the present inventors have conducted extensive studies and have made the present invention.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an insulating nature is good, and high dry-type transformer with iron core insulation system of stability.

In order to achieve the above purpose, the utility model discloses a solution is:

a dry-type transformer with an iron core insulation structure comprises an iron core pressing mechanism and an iron core column, wherein the iron core pressing mechanism comprises an upper clamping piece, a lower clamping piece and pulling plates, the pulling plates are arranged on two sides of the iron core column respectively, the lower end of each pulling plate is mounted on the lower clamping piece, and the upper end of each pulling plate is mounted on the upper clamping piece; the method is characterized in that: the hot shrinkage sleeve is sleeved outside each pulling plate respectively and used for shrinking after heating, two ends of each hot shrinkage sleeve extend to positions close to two ends of the corresponding pulling plate respectively, resin prepreg cloth used for resin exudation and solidification after heating is wound outside the iron core column and the pulling plates together, the length of the wound resin prepreg cloth is larger than or equal to the perimeter of the iron core column, and each hot shrinkage sleeve is clamped between the resin prepreg cloth and the pulling plate respectively.

The thermal shrinkable sleeve is 10 KV-level.

The resin prepreg is D279 resin prepreg.

The outer surface of each thermal shrinkable sleeve is respectively attached to the inner surface of the resin prepreg cloth.

After the structure is adopted, the utility model discloses following beneficial effect has: the pull plate is sleeved with the thermal shrinkable sleeve, the heated thermal shrinkable sleeve tightly covers the pull plate, and the insulation of the thermal shrinkable sleeve is not influenced by the environment, so that the phenomenon that the insulation effect of the iron core column is unstable due to the fact that the pull plate is influenced by the environment is avoided, and the insulation effect of the iron core column is enhanced; and, wrap up by resin prepreg cloth at the iron core post and the arm-tie above that together, the pyrocondensation cover is pressed from both sides and is established between resin prepreg cloth and the arm-tie that corresponds this moment, and resin prepreg cloth permeates out the resin after the stoving heating to solidify and sheathe in at iron core post and pyrocondensation, with the further insulation of strengthening the iron core post, thereby make the whole insulation of iron core post reach high resistance value, and stability is high.

Drawings

Fig. 1 is a schematic structural diagram of an iron core pressing mechanism in the prior art;

FIG. 2 is a schematic structural view of the present invention;

fig. 3 is a schematic structural view of the pulling plate and the heat shrinkable sleeve in fig. 2.

In the figure:

10-pulling a plate; 11-an upper clamp;

12-a lower clamp; 20-core limb;

30-iron yoke screw; 40-heat shrinkable sleeve;

50-resin prepreg cloth.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.

A dry-type transformer with an iron core insulation structure is an improvement on the basis of a common dry-type transformer, and comprises an iron core column 20, a winding and an iron core pressing mechanism, wherein the iron core column 20 is an iron core silicon steel sheet lamination formed by silicon steel sheets, the iron core pressing mechanism comprises an upper clamping piece 11, a lower clamping piece 12 and a pulling plate 10, the pulling plate 10 is a T-shaped plate, the upper clamping piece 11 is two upper channel steels arranged back to back, the two upper channel steels are clamped on two sides of an iron yoke on the iron core through an iron yoke screw rod 30, and gaps matched with the upper ends of the pulling plate 10 are respectively arranged on the vertical surfaces of the two upper channel steels; the lower clamping piece 12 is two lower channel steels arranged back to back, the two lower channel steels are clamped on two sides of the iron core lower iron yoke through iron yoke screws 30, and the lower end of the pulling plate 10 is installed on the lower clamping piece 12 through round steel. The vertical surface of the upper channel steel and the pulling plate 10 are in the same plane, and both ends of the pulling plate 10 are in a dovetail shape.

For convenience of description, the length direction of the upper clip member 11 is a transverse direction, and the direction horizontally perpendicular to the longitudinal direction is a longitudinal direction.

The two pulling plates 10 are sequentially arranged along the longitudinal direction, the two pulling plates 10 are respectively arranged on two sides of the core limb 20, the two pulling plates 10 are respectively sleeved with a heat-shrinkable sleeve 40, and the two heat-shrinkable sleeves 40 can be shrunk after being heated, so that the two heat-shrinkable sleeves 40 are tightly wrapped on the corresponding pulling plates 10 after being heated. In this embodiment, the two heat shrinkable sleeves 40 are 10KV heat shrinkable sleeves used in the existing transformer substation.

As a preferable mode, the lengths of the two heat shrinkable sleeves 40 are both smaller than the lengths of the two pulling plates 10, the upper ends of the two heat shrinkable sleeves 40 respectively extend to the upper ends adjacent to the corresponding pulling plates 10, and the lower ends of the two heat shrinkable sleeves 40 respectively extend to the lower ends adjacent to the corresponding pulling plates 10, so that the two heat shrinkable sleeves 40 respectively coat most areas of the corresponding pulling plates 10, and thus, the two heat shrinkable sleeves 40 are not affected by the environment, so that the insulating effect of the iron core column 20 caused by the influence of the environment on the pulling plates 10 is avoided, and the insulating effect of the iron core column 20 is ensured.

Further, the core limb 20 and the two pulling plates 10 thereon are respectively wrapped by a resin prepreg 50, which is wrapped for a circle along the corresponding core limb 20, that is, the length of the resin prepreg is equal to the circumference of the core limb 20, so as to enclose the core limb 20, the two pulling plates 10 and the two heat shrinkable sleeves 40 therein. The two heat shrinkable sleeves 40 are respectively clamped between the resin prepreg 50 and the corresponding pull plate 10, the outer surfaces of the two heat shrinkable sleeves 40 are respectively attached to the inner surface of the corresponding resin prepreg 50, the width of each resin prepreg 50 is smaller than the length of each heat shrinkable sleeve 40, so that each resin prepreg 50 cannot contact with each pull plate 10, the outer surface refers to the side of the heat shrinkable sleeve 40 away from the iron core column 20, and the inner surface refers to the side opposite to the iron core column 20. Further, the length of the resin prepreg 50 wound may also be greater than the circumference of the core limb 20, i.e., the resin prepreg 50 is wound more than one turn along the core limb 20.

In this embodiment, the resin prepreg is a conventional F-class DMD epoxy (i.e., D279 resin) prepreg, and the thickness of each resin prepreg 50 is 0.18 mm.

It should be noted that, in the dry-type transformer, there are three core legs 20, the three core legs 20 are sequentially arranged along the length direction of the upper clamping member 11, the three core legs 20 are located between the upper clamping member 11 and the lower clamping member 12, and the three core legs 20 are assembled in the above-mentioned manner.

The utility model relates to a dry-type transformer with iron core insulation structure, take one of them iron core post 20 as an example to explain, first two thermal shrinkable sleeves 40 overlap respectively the cover and establish outside corresponding arm-tie 10, and two arm-ties 10 that the cover was equipped with thermal shrinkable sleeve 40 all are heated shrink in the heating process, make two thermal shrinkable sleeves 40 tightly cover respectively on corresponding arm-tie 10, then install two each arm-tie 10 on iron core post 20 according to conventional mode, then wrap resin prepreg cloth respectively outside iron core post 20, resin prepreg cloth surrounds iron core post 20 and two arm-ties 10 in this moment, two thermal shrinkable sleeves 40 press from both sides respectively and establish between resin prepreg cloth and corresponding arm-tie 10 at this moment, resin prepreg cloth is its inside resin infiltration and solidification after toasting later, because of the resin has stronger insulating effect, the insulating effect of iron core post 20 has been strengthened, make the whole insulation of iron core post 20 reach high resistance value, and is not influenced by external environment, and has high stability.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should belong to the scope of the claims of the present invention.

Claims

1. A dry-type transformer with an iron core insulation structure comprises an iron core pressing mechanism and an iron core column, wherein the iron core pressing mechanism comprises an upper clamping piece, a lower clamping piece and pulling plates, the pulling plates are arranged on two sides of the iron core column respectively, the lower end of each pulling plate is mounted on the lower clamping piece, and the upper end of each pulling plate is mounted on the upper clamping piece; the method is characterized in that: the hot shrinkage sleeve is sleeved outside each pulling plate respectively and used for shrinking after heating, two ends of each hot shrinkage sleeve extend to positions close to two ends of the corresponding pulling plate respectively, resin prepreg cloth used for resin exudation and solidification after heating is wound outside the iron core column and the pulling plates together, the length of the wound resin prepreg cloth is larger than or equal to the perimeter of the iron core column, and each hot shrinkage sleeve is clamped between the resin prepreg cloth and the pulling plate respectively.

2. A dry-type transformer having a core insulation structure as set forth in claim 1, wherein: the thermal shrinkable sleeve is 10 KV-level.

3. A dry-type transformer having a core insulation structure as set forth in claim 1, wherein: the resin prepreg is D279 resin prepreg.

4. A dry-type transformer having a core insulation structure as set forth in claim 3, wherein: the outer surface of each thermal shrinkable sleeve is respectively attached to the inner surface of the resin prepreg cloth.