Shielding ring structure of transformer

Abstract

The utility model discloses a transformer shielding ring structure, and relates to the technical field of transformer manufacturing, the transformer shielding ring structure comprises an oil conduit, a flange, a cover plate, a threaded fastener, an inner side shielding ring and an outer side shielding ring, the flange is arranged at the end part of the oil conduit and is provided with a mounting hole; the cover plate is provided with a connecting hole corresponding to the mounting hole, and a threaded fastener penetrates through the connecting hole and the mounting hole to connect the cover plate and the flange; the inner side shielding ring comprises an inner side ring body and an inner side fixing piece, and the inner side ring body is arranged on the outer side of the oil guide pipe in a sleeving mode and connected with the flange through the inner side fixing piece; the outer side shielding ring comprises an outer side ring body and an outer side fixing piece, and the outer side ring body is connected with the cover plate through the outer side fixing piece. Therefore, the sharp corner at the end part of the oil conduit is surrounded by the inner side ring body, and meanwhile, the threaded fastener for connecting the flange and the cover plate is shielded by the outer side ring body, so that the sharp corner at the end part of the oil conduit is shielded, the risk of sharp corner discharge is reduced, and the occurrence probability of safety accidents is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer manufacturing, and particularly relates to a transformer shielding ring structure. Background Art

[0002] When a transformer is designed, in order to reduce the structural volume or facilitate the installation of electrical structures, etc., there will be sharp corners on the grounding metal parts such as the oil guiding pipe and the oil conservator of the transformer. Taking the oil guiding pipe as an example, the cross-section of the pipe body of the oil guiding pipe is rectangular, and there are sharp corners at its ends. Moreover, there are also sharp corners on the connecting bolts of the flange and the cover plate at the end of the oil guiding pipe. During the operation of the transformer, under the action of a high electric field intensity, charges are likely to concentrate at the sharp corners, thereby causing discharge. Especially nowadays, with the large-scale development of ultra-high and extra-high voltage transformers in China, the voltage level is getting higher and higher, and the ultra-high and extra-high voltage electric fields are more likely to cause sharp corner discharge. When the oil guiding pipe is in a high-strength electric field and cannot maintain a safe insulation distance, only chamfering the sharp corners may still cause discharge phenomena, thus triggering safety accidents.

[0003] In view of this, it is necessary to propose a transformer shielding ring structure to solve or at least alleviate the above technical problems. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a transformer shielding ring structure, aiming to solve the technical problem that there are metal sharp corners on the outside of ultra-high and extra-high voltage transformers, which are likely to cause safety accidents.

[0005] To achieve the above purpose, the utility model proposes a transformer shielding ring structure, including:

[0006] An oil guiding pipe;

[0007] A flange, the flange is installed at the end of the oil guiding pipe, and an installation hole is opened on the flange;

[0008] A cover plate, a connection hole corresponding to the installation hole is opened on the cover plate;

[0009] A threaded fastener, the threaded fastener passes through the connection hole and the installation hole to connect the cover plate and the flange;

[0010] An inner shielding ring, the inner shielding ring includes an inner ring body and an inner fixing member, the inner ring body is sleeved on the outside of the oil guiding pipe and is connected to the flange through the inner fixing member;

[0011] An outer shielding ring, the outer shielding ring includes an outer ring body and an outer fixing member, the outer ring body is connected to the cover plate through the outer fixing member.

[0012] In one embodiment, the inner ring body is formed with a first opening, and the outer ring body is formed with a second opening.

[0013] In one embodiment, the size of the first opening is larger than that of the second opening.

[0014] In one embodiment, inner fixing members are connected to the inner ring body on both sides of the first opening, and outer fixing members are connected to the outer ring body on both sides of the second opening.

[0015] In one embodiment, the inner fixing member includes a first mounting portion and a first connecting portion. The first connecting portion is connected to the inner ring body. An inner through hole is formed in the first mounting portion. The inner through hole is arranged corresponding to the mounting hole. The inner through hole and the mounting hole are connected by a bolt. There is a first included angle α between the first mounting portion and the first connecting portion, and the first included angle α satisfies: 45° ≤ α ≤ 135°;

[0016] The outer fixing member includes a second mounting portion and a second connecting portion. The second connecting portion is connected to the outer ring body. An outer through hole is formed in the second mounting portion. The outer through hole is arranged corresponding to the connecting hole. The outer through hole and the connecting hole are connected by a bolt. There is a second included angle β between the second mounting portion and the second connecting portion, and the second included angle β satisfies: 45° ≤ β ≤ 135°.

[0017] In one embodiment, the nut of the bolt is arranged on one side of the outer shielding ring, and the extending end of the screw rod of the bolt is arranged on one side of the inner shielding ring. The projection height of the first connecting portion on the plane perpendicular to the flange is greater than the length of the extending end of the screw rod, and the projection height of the second connecting portion on the plane perpendicular to the flange is greater than the height of the nut.

[0018] In one embodiment, the projections of the inner through hole and the outer through hole on the cover plate do not overlap.

[0019] In one embodiment, the flange includes a first insulating portion sprayed with an insulating layer and a first lead portion not sprayed with the insulating layer, and the inner fixing member is connected to the first lead portion;

[0020] The cover plate includes a second insulating portion sprayed with the insulating layer and a second lead portion not sprayed with the insulating layer, and the outer fixing member is connected to the second lead portion.

[0021] In one embodiment, the shielding ring structure further includes a ground wire. A gasket is provided between the flange and the cover plate. A first grounding seat and a first lead wire electrically connected to the first grounding seat are provided on the flange. A second grounding seat and a second lead wire electrically connected to the second grounding seat are provided on the cover plate. Both the first lead wire and the second lead wire are connected to the ground wire.

[0022] In one embodiment, a first cavity is formed inside the inner ring body, and a second cavity is formed inside the outer ring body. The inner fixing member is connected to the inner ring body to enclose the first cavity, and the outer fixing member is connected to the outer ring body to enclose the second cavity.

[0023] In the technical solution provided by the present utility model, the transformer shielding ring structure includes an oil guide pipe, a flange, a cover plate, a threaded fastener, an inner shielding ring and an outer shielding ring. Among them, the flange is installed at the end of the oil guide pipe, and an installation hole is provided on the flange; a connection hole corresponding to the installation hole is provided on the cover plate, and the threaded fastener passes through the connection hole and the installation hole to connect the cover plate and the flange; the inner shielding ring includes an inner ring body and an inner fixing member, and the inner ring body is sleeved outside the oil guide pipe and connected to the flange through the inner fixing member; in addition, the outer shielding ring includes an outer ring body and an outer fixing member, and the outer ring body is connected to the cover plate through the outer fixing member. Through this setting, the sharp corner at the end of the oil guide pipe is surrounded by the inner ring body of the inner shielding ring, and at the same time, the threaded fastener connecting the flange and the cover plate is shielded by the outer ring body, thereby completing the shielding of the sharp corner at the end of the oil guide pipe, reducing the risk of sharp corner discharge, and further reducing the occurrence probability of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of an embodiment of the transformer shielding ring structure provided by the present utility model;

[0026] Figure 2 It is Figure 1 a partial structural diagram of the L side in;

[0027] Figure 3 It is Figure 1 a partial structural diagram of the R side in;

[0028] Figure 4 It is Figure 2Enlarged schematic view of part A in [the figure];

[0029] Figure 5 is Figure 3 Enlarged schematic view of part B in [the figure].

[0030] Explanation of the reference numerals in the attached drawings:

[0031] 100. Transformer shielding ring structure; 1. Flange; 2. Cover plate; 3. Threaded fastener; 4. Inner shielding ring; 41. Inner ring body; 411. First opening; 42. Inner fixing member; 421. First connecting portion; 422. First mounting portion; 4221. Inner through hole; 5. Outer shielding ring; 51. Outer ring body; 511. Second opening; 52. Outer fixing member; 521. Second connecting portion; 522. Second mounting portion; 5221. Outer through hole.

[0032] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the attached drawings. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0034] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions such as "first", "second" in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0036] Transformers play an important role in the power system and are usually an important part of the power transmission and transformation projects in the power system. With the development of the economy and the advancement of the industrialization process, the demand for electricity has increased sharply. This situation has promoted the continuous progress and upgrading of transformer technology to meet the transmission requirements of higher voltage levels. Against this background, the technology of ultra-high and extra-high voltage transformers above 500 kV has developed rapidly.

[0037] The oil-immersed transformer above 500 kV is a kind of transformer that uses transformer oil as the insulating and cooling medium. Usually, such an oil-immersed transformer requires the cooperation of a cooler to cool the transformer oil. When designing it, considering factors such as structural volume and ease of installation, there will be some sharp corners in the structures such as the cooler oil guide pipe and the conservator. Taking the cooler oil guide pipe as an example, the cooler is usually installed on the short-axis side of the transformer, with three to four groups arranged on one side and symmetrically arranged on both sides. Limited by the number and height of the coolers, the high-voltage bushing of the transformer is the place where the insulation distance to the ground is the closest relative to the high-voltage upper end of the cooler oil guide pipe. In the case of ultra-high voltage, discharge phenomena are likely to occur at the sharp corners of the cooler oil guide pipe, which may break down the high-voltage bushing or other electrical structures of the transformer, causing safety accidents.

[0038] In view of the above background, it is necessary to propose a transformer shielding ring structure to solve the above technical problems.

[0039] Please refer to Figures 1 to 3 , in an embodiment of the present invention, the transformer shielding ring structure 100 includes an oil guide pipe, a flange 1, a cover plate 2, a threaded fastener 3, an inner shielding ring 4 and an outer shielding ring 5. Among them, the flange 1 is installed at the end of the oil guide pipe, and the flange 1 is provided with mounting holes. The cover plate 2 is provided with connection holes corresponding to the mounting holes. The threaded fastener 3 passes through the connection holes and the mounting holes to connect the cover plate 2 and the flange 1; the inner shielding ring 4 includes an inner ring body 41 and an inner fixing member 42. The inner ring body 41 is sleeved outside the oil guide pipe and is connected to the flange 1 through the inner fixing member 42; at the same time, the outer shielding ring 5 includes an outer ring body 51 and an outer fixing member 52. The outer ring body 51 is connected to the cover plate 2 through the outer fixing member 52.

[0040] Specifically, the inner shielding ring 4 is used to shield the sharp corners at the end of the oil guiding pipe, and the outer shielding ring 5 is used to shield the sharp corners on the threaded fastener 3. Usually, the threaded fastener 3 includes a bolt, and the bolt passes through the connection hole and the mounting hole in sequence to fix the cover plate 2 on the flange 1. The flange 1 is usually fixed to the end of the oil guiding pipe by welding. The inner shielding ring 4 is sleeved on the periphery of the oil guiding pipe. The oil guiding pipe is generally rectangular and has rounded corners. The rounded corner design can avoid the generation of discharge phenomena to a certain extent. However, in extra-high voltage and ultra-high voltage transformers, this setting may still cause the generation of discharge phenomena. Therefore, in this embodiment, the inner shielding ring 4 is sleeved on the periphery of the end of the oil guiding pipe to enable it to shield the sharp corners at the end of the oil guiding pipe. In addition, after the cover plate 2 is fixed on the flange 1 by using the threaded fastener 3, when the threaded fastener 3 is a bolt, there is also a sharp corner at the nut of the bolt. When the cover plate 2 is installed, the nut is generally arranged on the side of the cover plate 2 away from the flange 1. Therefore, in order to avoid the discharge phenomenon at the end of the bolt from damaging other electrical structures in the transformer, an outer shielding ring 5 is arranged near the bolt. At the same time, by setting the outer shielding ring 5, the sharp corners of the cover plate 2 itself can also be shielded. In addition, the manufacturing materials of the inner ring body 41 and the outer ring body 51 usually include one of copper pipes, aluminum pipes, and steel pipes with good electrical conductivity and certain flexibility. After being made, the inner ring body 41 is connected to the flange 1 through the inner fixing piece 42, and the outer ring body 51 is connected to the cover plate 2 through the outer fixing piece 52. The connection methods include welded connection and bolt connection. If bolt connection is adopted, the threaded fastener 3 in this embodiment can be used for connection. Generally, multiple threaded fasteners 3 are provided. Most of the threaded fasteners 3 are only used to connect the flange 1 and the cover plate 2. The installation forms of the remaining threaded fasteners 3 have two cases. In one case, the threaded fastener 3 connects the flange 1, the cover plate 2, and the outer fastener or the inner fastener at the same time. In the other case, the threaded fastener 3 connects the flange 1, the cover plate 2, the outer fastener, and the inner fastener at the same time. Among them, one end of the inner fixing piece 42 is used to connect the inner ring body 41, and the other end is used to connect the flange 1. The connection method between the inner fixing piece 42 and the inner ring body 41 includes welded connection; one end of the outer fixing piece 52 is used to connect the outer ring body 51, and the other end is used to connect the cover plate 2. The connection method between the outer fixing piece 52 and the outer ring body 51 includes welded connection.

[0041] In the technical solution provided by the present utility model, the transformer shielding ring structure 100 includes an oil guide pipe, a flange 1, a cover plate 2, a threaded fastener 3, an inner shielding ring 4, and an outer shielding ring 5. Among them, the flange 1 is installed at the end of the oil guide pipe, and the flange 1 is provided with mounting holes; the cover plate 2 is provided with connection holes corresponding to the mounting holes, and the threaded fastener 3 passes through the connection holes and the mounting holes to connect the cover plate 2 and the flange 1; the inner shielding ring 4 includes an inner ring body 41 and an inner fixing member 42, and the inner ring body 41 is sleeved outside the oil guide pipe and connected to the flange 1 through the inner fixing member 42; in addition, the outer shielding ring 5 includes an outer ring body 51 and an outer fixing member 52, and the outer ring body 51 is connected to the cover plate 2 through the outer fixing member 52. Through this setting, the sharp corner at the end of the oil guide pipe is surrounded by the inner ring body 41 of the inner shielding ring 4, and at the same time, the threaded fastener 3 connecting the flange 1 and the cover plate 2 is shielded by the outer ring body 51, thereby completing the shielding of the sharp corner at the end of the oil guide pipe, reducing the risk of sharp corner discharge, and further reducing the occurrence probability of safety accidents.

[0042] Further, in an embodiment of the present utility model, the inner ring body 41 is formed with a first opening 411, and the outer ring body 51 is formed with a second opening 511. Please refer to Figure 2 With Figure 3 , for the convenience of installation, neither the inner ring body 41 nor the outer ring body 51 adopts a closed ring body design. The copper pipe, aluminum pipe or steel pipe is bent to form a ring body with an opening, which can conveniently adjust the diameters of the inner ring body 41 and the outer ring body 51 according to the actual installation situation to improve the adaptability of the inner ring body 41 and the outer ring body 51.

[0043] Still further, please refer to Figure 2 With Figure 3 , in an embodiment of the present utility model, the size of the first opening 411 is larger than the size of the second opening 511. Through this setting, the inner ring body 41 can be more conveniently sleeved at the end of the oil guide pipe, facilitating the installation of the inner ring body 41. At the same time, the installation of the outer ring body 51 is relatively simple. Therefore, the size of the second opening 511 is set to be smaller, which can increase the shielding range and improve the shielding effect.

[0044] In addition, inner fixing members 42 are connected to both sides of the inner ring body 41 of the first opening 411, and outer fixing members 52 are connected to both sides of the outer ring body 51 of the second opening 511. Inner fixing members 42 are connected to the ends of the inner ring body 41 where the first opening 411 is formed, and outer fixing members 52 are connected to the ends of the outer ring body 51 where the second opening 511 is formed. This setting can improve the stability of the inner ring body 41 and the outer ring body 51 after installation, and avoid the shielding effect being affected due to the displacement of the inner ring body 41 and the outer ring body 51.

[0045] In an embodiment of the present utility model, the inner fixing member 42 includes a first mounting portion 422 and a first connecting portion 421. The first connecting portion 421 is connected to the inner ring body 41. An inner through hole 4221 is formed in the first mounting portion 422. The inner through hole 4221 is correspondingly arranged with the mounting hole. The inner through hole 4221 and the mounting hole are connected by a bolt. There is a first included angle α between the first mounting portion 422 and the first connecting portion 421, and the first included angle α satisfies: 45° ≤ α ≤ 135°; the outer fixing member 52 includes a second mounting portion 522 and a second connecting portion 521. The second connecting portion 521 is connected to the outer ring body 51. An outer through hole 5221 is formed in the second mounting portion 522. The outer through hole 5221 is correspondingly arranged with the connecting hole. The outer through hole 5221 and the connecting hole are connected by a bolt. There is a second included angle β between the second mounting portion 522 and the second connecting portion 521, and the second included angle β satisfies: 45° ≤ β ≤ 135°. Specifically, please refer to Figure 4 and Figure 5 , the first connecting portion 421 in the inner fixing member 42 is used to connect to the end of the inner ring body 41. The first connecting portion 421 and the first mounting portion 422 can be prepared by an integral forming process or connected by welding. The first mounting portion 422 is bolted to the flange 1 through the inner through hole 4221. In this embodiment, the first connecting portion 421 and the first mounting portion 422 are connected to form an "L"-shaped member, and the first included angle α is set to 90°, so that the first mounting portion 422 is arranged parallel to the inner ring body 41. This setting can change the installation height of the inner ring body 41 by changing the length of the first connecting portion 421, so as to keep the inner ring body 41 parallel to the plane of the flange 1 when installed on the flange 1 through the inner fixing member 42, and keep a certain gap between the inner ring body 41 and the flange 1. Similarly, the second included angle β is set to 90°, and the outer fixing member 52 is integrally in an "L" shape. The second connecting portion 521 is connected to the end of the outer ring body 51, and the second mounting portion 522 is arranged parallel to the outer ring body 51. After the inner ring body 41 is installed on the cover plate 2 through the inner fixing member 42, the outer ring body 51 can be kept parallel to the plane of the cover plate 2, and a certain gap is kept between the outer ring body 51 and the cover plate 2. Through this setting, it is possible to avoid "magnetic shielding short circuit" in a high-voltage environment, reduce the possibility of the shielding ring itself and its surrounding heating, and improve the stability of the transformer operation.

[0046] Further, the nut of the bolt is arranged on one side of the outer shielding ring 5, and the protruding end of the screw rod of the bolt is arranged on one side of the inner shielding ring 4. The projected height of the first connecting portion 421 on the plane perpendicular to the flange 1 is greater than the length of the protruding end of the screw rod, and the projected height of the second connecting portion 521 on the plane perpendicular to the flange 1 is greater than the height of the nut. Specifically, in the direction perpendicular to the plane of the flange 1, the height of the first connecting portion 421 needs to be greater than the length of the protruding end of the screw rod, so that the gap between the inner ring body 41 and the flange 1 can accommodate the protruding end of the screw rod, avoiding the situation of the inner ring body 41 being obliquely installed. At the same time, in the same direction, the height of the second connecting portion 521 is greater than the height of the nut, so that the gap between the outer ring body 51 and the cover plate 2 can accommodate the nut, thereby avoiding the situation of the outer ring body 51 being obliquely installed. Among them, the inner ring body 41 needs to be arranged close to the end of the protruding end of the screw rod, and the outer ring body 51 needs to be arranged close to the nut, avoiding the distance between the inner ring body 41 and the flange 1 being too large and the distance between the outer ring body 51 and the cover plate 2 being too large, so as to prevent the shielding effect on the sharp corners from deteriorating.

[0047] In addition, in an embodiment of the present utility model, in order to avoid the situation where there are many components connected by bolts in the direction perpendicular to the flange 1, the projections of the inner through hole 4221 and the outer through hole 5221 on the cover plate 2 are set to be non - overlapping. In this way, the situation where one bolt connects the inner fixing member 42, the flange 1, the cover plate 2 and the outer fixing member 52 at the same time is avoided, so that one bolt can at most connect the flange 1, the cover plate 2 and the inner fixing member 42 or the outer fixing member 52, thereby avoiding local stress concentration.

[0048] In an embodiment of the present utility model, the flange 1 includes a first insulating portion sprayed with an insulating layer and a first lead portion not sprayed with an insulating layer, and the inner fixing member 42 is connected to the first lead portion; the cover plate 2 includes a second insulating portion sprayed with an insulating layer and a second lead portion not sprayed with an insulating layer, and the outer fixing member 52 is connected to the second lead portion. That is, the connection parts between the flange 1 and the inner fixing member 42 and between the cover plate 2 and the outer fixing member 52 are not provided with insulating layers, so that electrical contact can be ensured between the inner fixing member 42 and the flange 1, and electrical contact can be ensured between the outer fixing member 52 and the cover plate 2.

[0049] Furthermore, the shielding ring structure further includes a ground wire. A gasket is provided between the flange 1 and the cover plate 2. A first grounding seat and a first lead wire electrically connected to the first grounding seat are provided on the flange 1, and a second grounding seat and a second lead wire electrically connected to the second grounding seat are provided on the cover plate 2. Both the first lead wire and the second lead wire are connected to the ground wire. Specifically, in order to ensure the sealing performance, a gasket is provided between the flange 1 and the cover plate 2, so that they are insulated from each other. By leading out the first lead wire from the flange 1, leading out the second lead wire from the cover plate 2, and connecting the first lead wire and the second lead wire to the ground wire, the inner shielding ring 4 and the outer shielding ring 5 are grounded simultaneously. This setting can effectively prevent insulation breakdown or discharge phenomena caused by excessive voltage and increase the safety of the transformer.

[0050] In an embodiment of the present invention, a first cavity is formed inside the inner ring body 41, and a second cavity is formed inside the outer ring body 51. The inner fixing member 42 is connected to the inner ring body 41 to close the first cavity, and the outer fixing member 52 is connected to the outer ring body 51 to close the second cavity. Specifically, the manufacturing materials of the inner ring body 41 and the outer ring body 51 include copper rings and aluminum rings, which are hollow inside. After being bent into the inner ring body 41 and the outer ring body 51, a first cavity and a second cavity are respectively formed in the inner ring body 41 and the outer ring body 51. In this embodiment, the first cavity is closed by the first connecting portion 421 in the inner fixing member 42, and the second cavity is closed by the second connecting portion 521 in the outer fixing member 52. Through this setting, the electric field distribution can be effectively improved, the insulation performance can be enhanced, and the manufacturing costs of the inner ring body 41 and the outer ring body 51 can be reduced.

[0051] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A transformer shielding ring structure, characterized in that, Comprising: An oil guiding pipe; A flange, which is installed at the end of the oil guiding pipe, and an installation hole is provided on the flange; A cover plate, and connection holes corresponding to the installation holes are provided on the cover plate; Threaded fasteners, which pass through the connection holes and the installation holes to connect the cover plate and the flange; An inner shielding ring, which includes an inner ring body and an inner fixing member, the inner ring body is sleeved on the outer side of the oil guiding pipe and is connected to the flange through the inner fixing member; An outer shielding ring, which includes an outer ring body and an outer fixing member, the outer ring body is connected to the cover plate through the outer fixing member.

2. The transformer shielding ring structure according to claim 1, characterized in that, The inner ring body is formed with a first opening, and the outer ring body is formed with a second opening.

3. The transformer shielding ring structure according to claim 2, wherein, The size of the first opening is larger than that of the second opening.

4. The transformer shielding ring structure according to claim 2, wherein Inner fixing members are connected to both sides of the first opening on the inner ring body, and outer fixing members are connected to both sides of the second opening on the outer ring body.

5. The transformer shielding ring structure according to claim 1, wherein The inner fixing member includes a first installation part and a first connection part, the first connection part is connected to the inner ring body, an inner through hole is provided on the first installation part, the inner through hole is arranged corresponding to the installation hole, the inner through hole and the installation hole are connected by bolts, and a first included angle α exists between the first installation part and the first connection part, and the first included angle α satisfies: 45° ≤ α ≤ 135°; The outer fixing member includes a second installation part and a second connection part, the second connection part is connected to the outer ring body, an outer through hole is provided on the second installation part, the outer through hole is arranged corresponding to the connection hole, the outer through hole and the connection hole are connected by bolts, and a second included angle β exists between the second installation part and the second connection part, and the second included angle β satisfies: 45° ≤ β ≤ 135°.

6. The transformer shielding ring structure according to claim 5, wherein, The nut of the bolt is arranged on one side of the outer shielding ring, the protruding end of the screw rod of the bolt is arranged on one side of the inner shielding ring, the projection height of the first connection part on the plane perpendicular to the flange is greater than the length of the protruding end of the screw rod, and the projection height of the second connection part on the plane perpendicular to the flange is greater than the height of the nut.

7. The transformer shielding ring structure according to claim 5, characterized in that, The projections of the inner through hole and the outer through hole on the cover plate do not coincide.

8. The transformer shielding ring structure according to claim 1, characterized in that, The flange includes a first insulating part sprayed with an insulating layer and a first lead part not sprayed with the insulating layer, and the inner fixing member is connected to the first lead part; The cover plate includes a second insulating part sprayed with the insulating layer and a second lead part not sprayed with the insulating layer, and the outer fixing member is connected to the second lead part.

9. The transformer shielding ring structure according to claim 8, wherein, The shielding ring structure further includes a ground wire, a sealing gasket is arranged between the flange and the cover plate, a first grounding seat and a first lead electrically connected to the first grounding seat are arranged on the flange, a second grounding seat and a second lead electrically connected to the second grounding seat are arranged on the cover plate, and both the first lead and the second lead are connected to the ground wire.

10. The transformer shielding ring structure according to claim 1, characterized in that, A first cavity is formed inside the inner annular body, a second cavity is formed inside the outer annular body, the inner fixing member is connected to the inner annular body to close the first cavity, and the outer fixing member is connected to the outer annular body to close the second cavity.

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