CN208027893U - A kind of dry-type transformer - Google Patents

Abstract

The utility model 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 which are placed on the lower end of the iron core in turn, an inner gasket is arranged between the upper low-voltage coil and the lower low-voltage coil, an outer gasket is arranged between the upper high-voltage coil and the lower high-voltage coil, and the upper low-voltage coil and the upper high-voltage wire An upper screen is provided between the coils, 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; the upper screen and the lower screen are set, and a gap is set between the two. On the one hand, 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 production costs.

Description

A dry type transformer

technical field

The utility model 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.

Utility model content

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

In order to solve the above technical problems, the utility model 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 placed 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 sequentially sleeved at the lower end of the iron core, and an inner gasket is provided between the upper low-voltage coil and the lower low-voltage coil, so 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 an upper screen is provided between the lower low-voltage coil and the lower high-voltage coil. As for the lower 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 utility model includes an upper splint, a lower splint and a transformer installed between the upper splint and the lower splint. The lower low-voltage coil and the lower high-voltage coil are set at the lower end of the iron core. 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. There is an upper screen between them, a lower screen between the lower low-voltage coil and the lower high-voltage coil, and a gap 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 utility model 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 enable those skilled in the art to better understand the solution of the utility model, the utility model 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 the 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 utility model includes an upper splint 61, a lower splint 62, and a transformer installed between the upper splint 61 and the lower splint 62. The low-voltage 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 An outer gasket 42 is arranged between the lower high-voltage coils 32, an upper screen 51 is arranged between the upper low-voltage coil 21 and the upper high-voltage coil 31, and a lower screen 52 is arranged between the lower low-voltage coil 22 and the lower high-voltage coil 32. 51 and the lower screen 52 is provided with a gap.

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. Can improve the overall strength of the transformer.

Further, the dry-type transformer provided by the specific embodiment of the utility model 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 use requirements. 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.

Furthermore, in the dry-type transformer provided by the specific embodiment of the present utility model, the two ends of the iron core 1 are connected to the upper splint 61 and the lower splint 62 respectively, and an upper support pad 71 is preferably provided between the upper screen 51 and the upper splint 61 , Between the lower surrounding screen 52 and the lower splint 62, a lower supporting pad 72 is preferably provided; the supporting pad 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 utility model.

Furthermore, in the dry-type transformer provided in the specific embodiment of the present invention, the upper splint 61 and the lower splint 62 can be 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 selected, which is not specifically limited in this application.

In the description of the utility model application documents, 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 the convenience and simplification of description, It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present invention.

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

Claims (6)

1. A dry-type transformer, characterized in that it 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 upper end of the iron core The upper low-voltage coil and the upper high-voltage coil, 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, an inner gasket is provided between the upper low-voltage coil and the lower low-voltage coil, and the upper high-voltage coil An outer gasket is provided between the lower high-voltage coil and the upper low-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. There is a gap between the upper screen and the lower screen. 2. The dry-type transformer according to claim 1, characterized in that, between the upper low-voltage coil and the upper high-voltage coil, there are a plurality of upper screens whose lengths are alternately extended and shortened, and the lower low-voltage coil A plurality of the lower enclosures corresponding to the upper enclosures are provided between the lower high-voltage coil, and the lengths of the upper enclosures and the lower enclosures are alternately extended and shortened. 3 . The dry-type transformer according to claim 2 , wherein glass filaments are wound on outer rings of the upper low-voltage coil, the lower low-voltage coil, the upper high-voltage coil, and the lower high-voltage coil. 4 . 4. The dry-type transformer according to claim 3, wherein the transformer is a three-phase three-column transformer. 5. The dry-type transformer according to claim 4, characterized in that, the two ends of the iron core are respectively connected to the upper splint and the lower splint, and a An upper support pad, and a lower support pad is provided between the lower screen and the lower splint. 6 . The dry-type transformer according to claim 5 , wherein the upper clamping plate and the lower clamping plate are symmetrically tensioned and fixed by screws.