CN212587345U

CN212587345U - Insulation system structure of penetrating screw rod of dry type transformer

Info

Publication number: CN212587345U
Application number: CN202021514682.5U
Authority: CN
Inventors: 孙兴利; 戚威; 祖鹤琼; 于海东
Original assignee: Liaoning Huaye Group Development Co Ltd
Current assignee: Liaoning Huaye Group Development Co Ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2021-02-23
Anticipated expiration: 2030-07-28

Abstract

The insulation system structure comprises a pre-impregnated DMD (digital micromirror device) and quick-drying epoxy resin paint, wherein the pre-impregnated DMD is a multi-layer circular structure and is sequentially sleeved outside an iron core penetrating screw of the transformer, gaps are reserved among the multi-layer pre-impregnated DMD, and the quick-drying epoxy resin paint is filled in the gaps of the multi-layer pre-impregnated DMD. A pre-impregnated DMD is used as an insulation system framework, and quick-dry epoxy resin paint is filled to form an integrally-formed feed-through screw insulation system. The gap between the feed-through screw and the insulation thereof is eliminated, and the integral noise of the dry-type transformer is reduced; the process problem that the iron core cannot be tightened due to overlong insulation of the feed-through screw is avoided; the risk of contact between the feed-through screw and the iron core silicon steel sheet caused by insulation damage is reduced; the problem of rotation of the feed-through screw, which is easy to occur in the process of fixing the feed-through screw, is avoided; the dynamic stability of the transformer iron core is improved, and the transformer can adapt to the use environment of a transformer with a large and frequent voltage fluctuation range at the tail end of a line.

Description

Insulation system structure of penetrating screw rod of dry type transformer

Technical Field

The utility model relates to a transformer technical field, in particular to new-type cross-core screw rod insulation system structure of dry-type transformer.

Background

At present, due to the geographic environment in Africa, the transformer is often small in capacity, large and frequent in terminal voltage fluctuation range, and higher requirements are put forward on the dynamic stability of a transformer core. The insulation of the through screw of the existing dry-type transformer is usually phenolic paper tube or heat shrink tube. Both structures have certain drawbacks: a gap is formed between the phenolic paper tube and the through screw, and a gap is also formed between the phenolic paper tube and the silicon steel sheet, so that extra noise is generated due to iron core oscillation during the operation of the transformer; the heat shrink tube is easy to be damaged due to the fact that the heat shrink tube is in contact with a silicon steel sheet which vibrates for a long time when the transformer operates, and therefore the serious consequence that the iron core is grounded at multiple points due to the fact that the penetrating screw rod is in contact with the silicon steel sheet due to insulation damage is achieved. Therefore, a new insulation system needs to be developed to solve the unreliable insulation problem of the penetrating screw rod of the dry-type transformer.

Disclosure of Invention

In order to solve the technical problem that the background art provided, the utility model provides an insulating system structure of new-type cross-core screw rod of dry-type transformer solves the insulating unreliable problem of dry-type transformer cross-core screw rod, improves the dynamic stability of transformer core, can adapt to the terminal voltage fluctuation range of circuit big and frequent transformer core's service environment.

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

the utility model discloses an insulating system structure of dry-type transformer punching screw includes preimpregnation DMD (1) and rapid-curing cutback epoxy lacquer (2), and preimpregnation DMD (1) is multilayer annular structure, overlaps in proper order and outside at the iron core punching screw (4) of transformer, and the multilayer is preimpregnated and is left the gap between DMD (1), and rapid-curing cutback epoxy lacquer (2) are filled in the gap department that multilayer was preimpregnated DMD (1).

Furthermore, quick-drying epoxy resin paint (2) is filled between the pre-impregnated DMD (1) and the iron core penetrating screw (4).

Further, the outermost layer of the prepreg DMD (1) is also provided with quick-drying epoxy resin paint (2).

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a preimpregnation DMD is as insulation system skeleton, is assisted with the penetration screw rod insulation system that rapid-curing cutback epoxy lacquer was irritated and is constituted integrated into one piece. Compared with the prior art: 1. the gap between the feed-through screw and the insulation thereof is eliminated, and the integral noise of the dry-type transformer is reduced; 2. the process problem that the iron core cannot be tightened due to overlong insulation of the feed-through screw is avoided; 3. the risk of contact between the feed-through screw and the iron core silicon steel sheet caused by insulation damage is reduced; 4. the problem of rotation of the feed-through screw, which is easy to occur in the process of fixing the feed-through screw, is avoided; the dynamic stability of the transformer core is improved, and the transformer core can adapt to the use environment of the transformer core with large and frequent fluctuation range of the voltage at the tail end of the line.

Drawings

Fig. 1 is a cross-sectional view of the structure of the insulation system of the dry-type transformer feed-through screw rod of the present invention;

fig. 2 is a front view of the overall structure of the insulation system of the dry-type transformer feed-through screw rod of the present invention;

FIG. 3 is a front view of the position of the core-piercing bolt of the transformer in the overall transformer;

fig. 4 is a top view of the position of the core-piercing bolt of the transformer in the overall transformer.

In the figure: 1-presoaking DMD 2-quick-drying epoxy resin paint 3-iron core silicon steel sheet 4-iron core penetrating screw 5-clamp insulation 6-clamp 7-insulation washer 8-fixing nut.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in figure 1, the utility model discloses an insulating system structure of dry-type transformer feed-through screw includes preimpregnation DMD (1) and quick-drying epoxy resin lacquer (2), and preimpregnation DMD (1) is multilayer annular structure, overlaps in proper order and is outside at the iron core feed-through screw (4) of transformer, leaves the gap between multilayer preimpregnation DMD (1), and quick-drying epoxy resin lacquer (2) are filled in the gap department that multilayer preimpregnation DMD (1). Quick-drying epoxy resin paint (2) is also filled between the preimpregnation DMD (1) and the iron core penetrating screw (4). The outermost layer presoaked with DMD (1) is also provided with quick-drying epoxy resin paint (2).

As shown in fig. 2, there are also a clamping piece insulator (5) and a clamping piece (6) at both ends of the transformer iron core silicon steel sheet (3), when the iron core is assembled, the iron core penetrating screw (4) sequentially penetrates through the silicon steel sheet (3), the clamping piece insulator (5) and the clamping piece (6) from the center to both ends, and all parts are clamped by the fixing nut (8) and the insulating washer (7). As shown in fig. 3-4, the position diagram of the iron core penetrating screw rod (4) in the integral transformer is shown, the clamping pieces (6) at the two ends of the iron core penetrating screw rod (4) are iron yoke clamping pieces at the upper end and the lower end of the iron core, generally steel channel clamping pieces, and the clamping piece insulation (5) is an insulation gasket padded between the clamping pieces (6) and the iron core silicon steel sheet (3).

In the operation of the transformer, the iron core penetrating screw rod (4) sequentially passes through the silicon steel sheet (3), the clamping piece insulator (5) and the clamping piece (6), all parts are clamped by the fixing nut (8) and the insulating washer (7) at the two ends of the iron core penetrating screw rod, and friction vibration cannot be generated due to the relative displacement of the silicon steel sheet (3) and the iron core penetrating screw rod (4), so that the overall noise level of the transformer is reduced; in the iron core assembling process, the silicon steel sheet (3), the iron core penetrating screw (4), the pre-dipped DMD (3) and the quick-drying epoxy resin paint (2) form a whole, so that the rotation of the iron core penetrating screw (4) cannot occur, and the whole anti-vibration capability of the iron core is increased, and the iron core is more in line with the electric environment with unstable voltage on the African grid side; the problem of unreliable insulation of the penetrating screw of the dry-type transformer is solved, the dynamic stability of the transformer core is improved, and the method can adapt to the use environment of the transformer core with large and frequent fluctuation range of the voltage at the tail end of a line.

The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.

Claims

1. The insulation system structure of the core-penetrating screw of the dry-type transformer is characterized by comprising a pre-impregnated DMD (1) and quick-drying epoxy resin paint (2), wherein the pre-impregnated DMD (1) is of a multilayer circular structure and sequentially sleeved outside an iron core-penetrating screw (4) of the transformer, gaps are reserved among the multiple layers of pre-impregnated DMD (1), and the quick-drying epoxy resin paint (2) is filled in the gaps of the multiple layers of pre-impregnated DMD (1).

2. A dry-type transformer feed-through screw insulation system structure according to claim 1, characterized in that a quick-dry epoxy resin paint (2) is filled between the pre-impregnated DMD (1) and the core feed-through screw (4).

3. A dry-type transformer feed-through screw insulation system according to claim 1, characterized in that the outermost layer of pre-impregnated DMD (1) also has quick-dry epoxy lacquer (2).