CN108010689A - A kind of dry-type transformer - Google Patents

Abstract

The invention discloses a dry-type transformer, which includes an upper splint, a lower splint, and a transformer installed between the upper splint and the lower splint. The transformer includes an iron core, an upper low-voltage coil and an upper high-voltage coil that are sequentially placed on the upper end of the iron core, and The lower low-voltage coil and the lower high-voltage coil are placed on the lower end of the iron core in turn. There is an inner gasket between the upper low-voltage coil and the lower low-voltage coil, and an outer gasket is arranged between the upper high-voltage coil and the lower high-voltage coil. The upper low-voltage coil and the upper high-voltage coil There is an upper screen between them, a lower screen is provided between the lower low-voltage coil and the lower high-voltage coil, and there is a gap between the upper screen and the lower screen; the upper screen and the lower screen are set, and a gap is set between the two. It can increase the insulation, effectively prevent the discharge effect between the high and low voltage coils, and reduce the axial distance, thereby reducing the length of the iron core, reducing the volume of the transformer, and saving the production cost.

Description

A dry type transformer

technical field

The invention relates to the technical field of power transformers, in particular to a dry-type transformer.

Background technique

Transformer is one of the important equipment in the power supply and distribution system of industrial and mining enterprises and civil buildings. Dry-type transformer is a kind of transformer, and its iron core and winding are not immersed in insulating oil.

Most of the existing dry-type transformers are casting type, that is, the wound coils are casted with resin, because epoxy resin has better insulation strength than air and transformer oil, and it also has higher mechanical strength and Moisture-proof and dust-proof performance, so dry-type transformers have the advantages of energy saving and convenient maintenance compared with oil-immersed transformers, and dry-type transformers are more and more popular among users. The dry-type transformer has an insulating layer between the high-voltage coil and the low-voltage coil. The insulating layer is mainly used to prevent discharge between the high-voltage and low-voltage coils. Due to the large protrusion of the insulating layer, the length of the iron core increases and the volume of the transformer increases. Increase design cost.

Therefore, how to solve the problems of large volume and high cost of the dry-type transformer is a technical problem to be solved by those skilled in the art.

Contents of the invention

The purpose of the present invention is to provide a dry-type transformer, which has a simple structure, a small volume, good insulation, and can save production costs.

In order to solve the above technical problems, the present invention provides a dry-type transformer, which includes an upper splint, a lower splint, and a transformer installed between the upper splint and the lower splint. The transformer includes an iron core, which is sequentially sleeved on the The upper low-voltage coil and the upper high-voltage coil at the upper end of the iron core, and the lower low-voltage coil and the lower high-voltage coil that are placed on the lower end of the iron core in turn, and an inner gasket is arranged between the upper low-voltage coil and the lower low-voltage coil. An outer gasket is provided between the upper high-voltage coil and the lower high-voltage coil, an upper screen is provided between the upper low-voltage coil and the upper high-voltage coil, and a lower screen is provided between the lower low-voltage coil and the lower high-voltage coil. As for the screen, there is a gap between the upper screen and the lower screen.

Preferably, a plurality of upper screens whose lengths are alternately extended and shortened are provided between the upper low-voltage coil and the upper high-voltage coil, and a plurality of upper enclosure screens are provided between the lower low-voltage coil and the lower high-voltage coil. For the plurality of lower enclosures corresponding to the enclosures, the lengths of the upper enclosures and the lower enclosures are alternately extended and shortened.

Preferably, the outer rings of the upper low-voltage coil, the lower low-voltage coil, the upper high-voltage coil and the lower high-voltage coil are all wound with glass filaments.

Preferably, the transformer is a three-phase three-column transformer.

Preferably, both ends of the iron core are respectively connected to the upper splint and the lower splint, an upper support pad is provided between the upper screen and the upper splint, and the lower screen and the lower splint A lower support pad is provided between them.

Preferably, the upper splint and the lower splint are tensioned and fixed symmetrically by screws.

The dry-type transformer provided by the present invention includes an upper splint, a lower splint, and a transformer installed between the upper splint and the lower splint. There is an inner gasket between the lower low voltage coil and the lower high voltage coil at the lower end of the iron core, an inner gasket between the upper low voltage coil and the lower low voltage coil, an outer gasket between the upper high voltage coil and the lower high voltage coil, and an outer gasket between the upper low voltage coil and the upper high voltage coil. An upper screen is provided, a lower screen is provided between the lower low-voltage coil and the lower high-voltage coil, and a gap is provided between the upper screen and the lower screen.

Set the upper screen and the lower screen, and set a relatively stretchable gap between the upper screen and the lower screen. On the one hand, it can increase the insulation and effectively prevent the discharge effect between the high and low voltage coils. In addition, between the upper low voltage coil and the lower low voltage coil. In addition, the upper high-voltage coil and the lower high-voltage coil are axially close to each other without screen contact, thereby reducing the axial distance, thereby reducing the length of the iron core, reducing the volume of the transformer, and saving manufacturing costs.

Description of drawings

Fig. 1 is a schematic structural view of a specific embodiment of a dry-type transformer provided by the present invention;

Fig. 2 is a schematic diagram of an open state of a specific embodiment of the transformer provided by the present invention.

Detailed ways

The core of the present invention is to provide a dry-type transformer, which has simple structure, small volume, good insulation, and can save production cost.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Figure 1 and Figure 2, Figure 1 is a schematic structural diagram of a specific embodiment of the dry-type transformer provided by the present invention; Figure 2 is a schematic diagram of an open state of a specific embodiment of the transformer provided by the present invention.

The dry-type transformer provided by the specific embodiment of the present invention includes an upper splint 61, a lower splint 62, and a transformer installed between the upper splint 61 and the lower splint 62. The coil 21 and the upper high-voltage coil 31, and the lower low-voltage coil 22 and the lower high-voltage coil 32 which are placed on the lower end of the iron core 1 in turn, an inner gasket 41 is arranged between the upper low-voltage coil 21 and the lower low-voltage coil 22, and the upper high-voltage coil 31 and the lower An outer gasket 42 is provided between the high-voltage coils 32, an upper screen 51 is provided between the upper low-voltage coil 21 and the upper high-voltage coil 31, and a lower screen 52 and an upper screen 51 are arranged between the lower low-voltage coil 22 and the lower high-voltage coil 32. There is a gap between the screen 52 and the lower screen.

The upper screen 51 and the lower screen 52 are set, and a relatively stretchable gap is set between the upper screen 51 and the lower screen 52. On the one hand, the insulation can be increased, and the discharge effect between the high and low voltage coils can be effectively prevented. In addition, the upper and lower voltage coils 21 and The axial proximity between the lower low-voltage coils 22 and the upper high-voltage coil 31 and the lower high-voltage coil 32 without screen contact reduces the axial distance, thereby reducing the length of the iron core 1 and reducing the volume of the transformer. Save production cost.

In order to further increase the insulation and prevent the discharge effect between the high and low voltage coils, between the upper low voltage coil 21 and the upper high voltage coil 31, a plurality of upper screens 51 whose lengths are alternately extended and shortened can be provided, and between the lower low voltage coil 22 and the lower high voltage line A plurality of lower enclosures 52 corresponding to the upper enclosures 51 may be arranged between the circles 32, and the lengths of the upper enclosures 51 and the lower enclosures 52 are extended and shortened alternately.

On the basis of the above-mentioned specific embodiments, the dry-type transformer provided by the specific embodiments of the present invention can also be wound with glass filaments on the outer rings of the upper low-voltage coil 21, the lower low-voltage coil 22, the upper high-voltage coil 31, and the high-voltage coil. Improve the overall strength of the transformer.

Further, the dry-type transformer provided in the specific embodiment of the present invention can specifically be a three-phase three-column transformer, that is, three one-way transformers can be arranged side by side between the upper splint 61 and the lower splint 62 to meet the requirements of use, and Easy to manufacture and maintain. Of course, the transformer may also be of other types such as a three-phase five-column transformer, which is not specifically limited in this application.

Further, in the dry-type transformer provided by the specific embodiment of the present invention, the two ends of the iron core 1 are respectively connected to the upper splint 61 and the lower splint 62, and an upper support pad 71 is preferably provided between the upper enclosure 51 and the upper splint 61, A lower support block 72 is preferably provided between the lower screen 52 and the lower splint 62; the support block can support the low-voltage coil and the high-voltage coil, increasing the structural stability of the transformer. The support pads can specifically select insulating pads such as wooden pads or silica gel pads, all within the protection scope of the present invention.

Furthermore, in the dry-type transformer provided by the specific embodiment of the present invention, the upper splint 61 and the lower splint 62 can be specifically tightened and fixed symmetrically by the screw 8, and the connection is simple and reliable. Of course, other connection methods such as riveting may also be used, which is not specifically limited in this application.

In the description of the application documents of the present invention, it should be understood that the orientation or relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for convenience and simplification of description, and It is not to indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, or operate in a particular orientation, and thus should not be construed as limiting the invention.

The dry-type transformer provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (6)

1. A kind of 1. dry-type transformer, it is characterised in that including upper clamp plate, lower clamp plate and installed in the upper clamp plate and it is described under Transformer between clamping plate, the transformer include iron core, the upper low-voltage coil for being sequentially sleeved in the iron core upper end and upper high pressure Coil, and be sequentially sleeved in the lower low-voltage coil of the iron core lower end and lower high-tension coil, the upper low-voltage coil and it is described under Inner washer is equipped between low-voltage coil, outer washer is equipped between the upper high-tension coil and the lower high-tension coil, it is described low Upper screen is equipped between crimping circle and the upper high-tension coil, is equipped with down between the lower low-voltage coil and the lower high-tension coil Screen, is equipped with gap between the upper screen and the lower screen.
2. 2. dry-type transformer according to claim 1, it is characterised in that the upper low-voltage coil and the upper high-tension coil Between be equipped with length alternately extend and shorten multiple upper screens, between the lower low-voltage coil and the lower high-tension coil Alternately extend equipped with the length with the upper corresponding multiple lower screens of screen, the upper screen and the lower screen and Shorten.
3. 3. dry-type transformer according to claim 2, it is characterised in that the upper low-voltage coil, the lower low-voltage coil, Glass fiber is wound with the outer ring of the upper high-tension coil and the lower high-tension coil.
4. 4. dry-type transformer according to claim 3, it is characterised in that the transformer is three-phase full-bridge converter.
5. 5. dry-type transformer according to claim 4, it is characterised in that the both ends of the iron core respectively with the upper clamp plate Connected with the lower clamp plate, be equipped with upper lip block between the upper screen and the upper clamp plate, the lower screen with it is described under Lower lip block is equipped between clamping plate.
6. 6. dry-type transformer according to claim 5, it is characterised in that pass through between the upper clamp plate and the lower clamp plate Screw rod is symmetrically strained and fixed.