CN211294854U

CN211294854U - Electrostatic screen and transformer

Info

Publication number: CN211294854U
Application number: CN202020222123.0U
Authority: CN
Inventors: 肖华; 侯宗章; 武祥申
Original assignee: Siemens Transformer Guangzhou Co Ltd
Current assignee: Guangzhou Siemens Energy Transformer Co.,Ltd.
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-08-18
Anticipated expiration: 2030-02-27

Abstract

The utility model provides an electrostatic screen and transformer, electrostatic screen includes first insulation layer, conductive layer, insulating end seal, opening insulator, second insulating layer and external conduction spare. The first insulating layer is of a cylindrical structure. The conductor layer is adjacent to the first insulating layer, has two opposite end faces perpendicular to an axis of the electrostatic shield, and has a head end and a tail end in a circumferential direction. The insulating end seals are configured on the two end faces of the conductor layer. The opening insulator is arranged between the head end and the tail end of the conductor layer. The second insulating layer is of a cylindrical structure, is adjacent to the conductor layer, and is respectively positioned on two sides of the conductor layer. The external conduction piece is electrically connected with the conductor layer. The utility model discloses an electrostatic screen can effectively reduce the coil of transformer and the electric field distortion between unshakable in one's determination for the transformer possesses the performance of preferred.

Description

Electrostatic screen and transformer

Technical Field

The utility model relates to a transformer technical field, especially an electrostatic screen and a transformer that has this electrostatic screen for transformer.

Background

The transformer has wide application in the industrial field, the transformer mainly has the function of converting voltage in a power system so as to be beneficial to power transmission, and the use of the transformer for increasing the voltage can reduce the line loss, improve the economy of power transmission and achieve the aim of long-distance power transmission; the transformer is used for reducing the voltage, so that the high voltage can be changed into various levels of use voltage required by users, and the requirements of the users are met.

A transformer is an electrical device operating according to the electromagnetic induction principle, and generally includes a core and a coil wound around the core, and in the prior art, there is a problem that the distortion of the electric field from the inner coil (i.e. the coil close to the core) to the core of the transformer is high, which is particularly prominent for a zigzag grounding transformer (without low-voltage secondary load) and a high-voltage isolation transformer.

Therefore, there is a need for an electrostatic shield that avoids high electric field distortion between the inner coil and the core of the transformer.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present invention is to provide an electrostatic shield and a transformer having the electrostatic shield, in which the electrostatic shield can effectively reduce the electric field distortion between the coil and the iron core of the transformer, so that the transformer has better performance.

The utility model provides an electrostatic screen, electrostatic screen is the tubular structure, and it includes first insulating layer, conductive layer, insulating end seal, opening insulator, second insulating layer and external conduction piece. The first insulating layer is of a cylindrical structure. The conductor layer is adjacent to the first insulating layer, the conductor layer has two opposite end faces, the two end faces are perpendicular to an axis of the electrostatic screen, and the conductor layer has a head end and a tail end in the circumferential direction. The insulating end seals are arranged on the two end faces of the conductor layer. The open insulator is disposed between the head end and the tail end of the conductor layer. The second insulating layer is of a cylindrical structure, the second insulating layer is adjacent to the conductor layer, and the second insulating layer and the first insulating layer are respectively located on two sides of the conductor layer. The external conduction piece is electrically connected with the conductor layer.

In one exemplary embodiment of the electrostatic shield, the first insulating layer and the second insulating layer are insulating prepreg cloths.

In an exemplary embodiment of the electrostatic shield, the conductive layer is made of aluminum foil.

In one exemplary embodiment of the electrostatic shield, the external conductor is a copper strip or wire.

The utility model also provides a transformer, it includes above-mentioned arbitrary electrostatic screen.

In one exemplary embodiment of a transformer, the transformer further includes a core and a coil disposed around the core, with the electrostatic shield being positioned between the core and the coil.

In an exemplary embodiment of the transformer, the external conductor is electrically connected to the core.

In an exemplary embodiment of the transformer, the transformer is a meander ground transformer or a high voltage isolation transformer.

The utility model discloses an among static screen and transformer, the static screen includes the conductive layer, two sides of conductive layer are equipped with first insulating layer and second insulating layer, dispose insulating end seal on two relative terminal surfaces of conductive layer, be equipped with the opening insulator between the ascending head end of conductive layer circumferencial direction and the tail end, and with the help of external conduction spare, the static screen can keep zero potential with the iron core of transformer, separate through static screen insulation, can effectively reduce the coil of transformer and the electric field distortion between the iron core for the transformer possesses the performance of preferred.

Drawings

The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings, in which:

fig. 1 is a schematic top view of an electrostatic shield according to an embodiment of the present invention.

Figure 2 is a side view schematic of the electrostatic shield of figure 1.

Fig. 3 is a partially enlarged schematic view of the electrostatic shield shown in fig. 1.

Figure 4 is a schematic cross-sectional view of the electrostatic shield of figure 3 taken along line IV-IV.

Fig. 5 is a schematic cross-sectional view of a transformer according to an embodiment of the present invention.

In the above figures, the reference numerals used are as follows:

10 electrostatic screen

11 first insulating layer

12 conductive layer

13 insulating end seal

14-opening insulator

15 second insulating layer

16 external connection conduction piece

100 transformer

20 iron core

30 coil

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail by referring to the following embodiments.

Fig. 1 is a schematic top view of an electrostatic shield according to an embodiment of the present invention, please refer to fig. 1, in which an electrostatic shield 10 of the embodiment has a tubular structure. Fig. 2 is a schematic side view of the electrostatic shield shown in fig. 1, fig. 3 is a partially enlarged schematic side view of the electrostatic shield shown in fig. 1, fig. 4 is a schematic cross-sectional view of the electrostatic shield shown in fig. 3 along a line IV-IV, please refer to fig. 2 to 4, the electrostatic shield 10 includes a first insulating layer 11, a conductive layer 12, an insulating end seal 13, an open insulator 14, a second insulating layer 15 and an external conductive element 16, the first insulating layer 11 is a cylindrical structure, the conductive layer 12 is adjacent to the first insulating layer 11, the conductive layer 12 has two opposite end surfaces, the two end surfaces are perpendicular to an axis of the electrostatic shield 10, and the conductive layer 12 has a head end and a tail end in a circumferential direction. The insulating end seals 13 are disposed on the two end faces of the conductive layer 12. The split insulator 14 is disposed between the leading end and the trailing end of the conductor layer 12. The second insulating layer 15 is a cylindrical structure, the second insulating layer 15 is adjacent to the conductive layer 12, and the second insulating layer 15 and the first insulating layer 11 are respectively located on two sides of the conductive layer 12. The external conductive element 16 is electrically connected to the conductive layer 12.

More specifically, the first insulating layer 11 and the second insulating layer 15 are insulating prepreg, such as DMD prepreg, but the present invention is not limited thereto.

In the present embodiment, the material of the conductive layer 12 is aluminum foil, and in other embodiments, the conductive layer 12 may be made of other materials.

The insulating end seal 13 is a substantially strip-shaped annular structure, and is used to hermetically insulate both end faces of the conductor layer 12. The split insulator 14 has a substantially square sheet-like configuration, and the split insulator 14 is provided between the head end and the tail end of the conductor layer 12 to prevent a short circuit in the conductor layer 12. The external conductor 16 is a copper strip or wire, but not limited thereto.

Fig. 5 is a schematic cross-sectional view of a transformer according to an embodiment of the present invention, please refer to fig. 5, and the present invention further provides a transformer 100 including any one of the electrostatic shields 10. The transformer 100 further includes a core 20 and a coil 30, the coil 30 being disposed around the core 20, and the electrostatic shield 10 being positioned between the core 20 and the coil 30. The external conductor 16 is electrically connected to the core 20, so that a zero potential is maintained between the external conductor 16 and the core 20. The insulating separation of the electrostatic shield 10 between the core 20 and the coil 30 is effective to reduce distortion of the electric field between the coil 30 and the core 20 of the transformer 100.

It should be noted that the iron core 20 may include upper and lower iron yokes and a core column, and the structure is three-phase three-column or single-phase two-column, and the electrostatic shield 10 and the coil 30 are disposed on the periphery of the core column. The coil 30 is an inner coil of the transformer 100, i.e., a coil near the core 20. The transformer 100 may be a zigzag grounding transformer (without low voltage secondary load) or a high voltage isolation transformer, but not limited thereto, and other transformers with higher problem of electric field distortion between the inner coil and the iron core may be used in the electrostatic shield 10 of the present invention.

The utility model discloses an electrostatic screen and transformer have following advantage at least:

1. the utility model discloses an among electrostatic screen and transformer, electrostatic screen includes the conductive layer, two sides of conductive layer are equipped with first insulating layer and second insulating layer, dispose insulating end seal on two relative terminal surfaces of conductive layer, be equipped with the opening insulator between the ascending head end of conductive layer circumferencial direction and the tail end, and with the help of external conduction spare, the electrostatic screen can keep zero potential with the iron core of transformer, separate through the electrostatic screen is insulating, can effectively reduce the coil of transformer (be close to the coil unshakable in one's determination) and the electric field distortion between the iron core, make the transformer possess the performance of preferred.

2. The utility model discloses an in the embodiment of electrostatic screen and transformer, the electrostatic screen surface is smooth, can reduce the corner formation electric field distortion unshakable in one's determination to the coil of reducible transformer and the distance between unshakable in one's determination, the structure of transformer is compacter.

3. In an embodiment of the present invention, the electrostatic shield and the transformer can reduce the distortion of the electric field at the corners of the iron core by using the electrostatic shield, thereby reducing the distance between the coil and the iron core, and reducing the usage amount of the coil, thereby reducing the cost of the transformer.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electrostatic shield (10), characterized in that the electrostatic shield (10) is a tubular structure comprising:

a first insulating layer (11) having a cylindrical structure;

a conductor layer (12) adjacent to the first insulating layer (11), the conductor layer (12) having opposing end faces perpendicular with respect to an axis of the electrostatic shield (10), the conductor layer (12) having a leading end and a trailing end in a circumferential direction;

insulating end seals (13) disposed on the two end faces of the conductor layer (12);

an opening insulator (14) disposed between the leading end and the trailing end of the conductor layer (12);

a second insulating layer (15) having a cylindrical structure, wherein the second insulating layer (15) is adjacent to the conductor layer (12), and the second insulating layer (15) and the first insulating layer (11) are respectively located on two sides of the conductor layer (12); and

and the external conduction piece (16) is electrically connected with the conductor layer (12).

2. The electrostatic shield (10) according to claim 1, characterized in that the first insulating layer (11) and the second insulating layer (15) are insulating prepreg cloths.

3. The electrostatic shield (10) according to claim 1, characterized in that the conductor layer (12) is an aluminum foil.

4. The electrostatic shield (10) of claim 1 wherein the external conductor (16) is a copper strip or wire.

5. Transformer (100), characterized in that it comprises an electrostatic screen (10) according to any one of claims 1 to 4.

6. The transformer (100) of claim 5, further comprising:

a core (20); and

a coil (30), the coil (30) disposed around the core (20), and the electrostatic shield (10) located between the core (20) and the coil (30).

7. The transformer (100) of claim 6, wherein the external conductor (16) is electrically connected to the core (20).

8. The transformer (100) of claim 5, wherein the transformer (100) is a meander ground transformer or a high voltage isolation transformer.