Transformer coil outlet shielding structure

Abstract

The utility model discloses a transformer coil leading-out head shielding structure, which relates to the technical field of transformer manufacture, and comprises a transformer coil, a voltage regulating coil leading-out group, a first insulating layer and a shielding rod, the transformer coil comprises a voltage regulating coil, the voltage regulating coil leading-out group comprises a plurality of voltage regulating leading-out heads, and the first insulating layer comprises a first insulating layer and a second insulating layer. The voltage regulating outlet head is led out from the voltage regulating coil; the first insulating layer wraps the outer side of the voltage regulating coil leading-out group, the shielding rods are arranged in the outermost voltage regulating outlet head in the plurality of voltage regulating outlet heads and close to one side of the first insulating layer, the shielding rods are arranged side by side, and when the voltage regulating outlet heads are connected with the transformer lead, the shielding rods are in short circuit with the voltage regulating outlet heads in a crimping mode. According to the technical scheme provided by the utility model, the electric shielding effect on the voltage regulating coil outlet head can be realized without adopting aluminum foil which is wrapped layer by layer and needs to be molded, the whole structure is simple, the processing is easy, and the processing quality and the working stability of the transformer can be ensured.

Description

Technical Field

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

[0002] In order to facilitate the connection between the voltage regulating coil of a transformer and the transformer lead structure, it is generally necessary to lead out multiple outgoing ends of the voltage regulating coil from the voltage regulating coil. However, when the outgoing ends of the voltage regulating coil are led out, due to the relatively concentrated positions, the electric field thereof will be distorted, which is likely to interfere with other electrical structures of the transformer. At the same time, the concentrated lead-out of the outgoing ends of the voltage regulating coil will also cause a temperature rise effect, affecting the stability and service life of the transformer during use. At present, in some designs, a method of wrapping the outgoing ends of the voltage regulating coil with aluminum foil is used for electrical shielding. However, the method of using aluminum foil for electrical shielding of the voltage regulating coil has a large processing difficulty and it is difficult to guarantee the processing quality. Therefore, it is difficult to guarantee the adjustment effect on the electrical shape of the outgoing ends of the voltage regulating coil, thereby affecting the working stability of the transformer.

[0003] In view of this, it is necessary to propose a shielding structure for the outgoing ends of a transformer coil 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 shielding structure for the outgoing ends of a transformer coil, aiming to solve the technical problem that the working stability of the transformer is easily affected when electrical shielding is performed on the voltage regulating coil of the transformer.

[0005] To achieve the above purpose, the utility model proposes a shielding structure for the outgoing ends of a transformer coil, including:

[0006] A transformer coil, the transformer coil including a voltage regulating coil;

[0007] A voltage regulating coil lead-out group, the voltage regulating coil lead-out group including a plurality of voltage regulating outgoing ends, the voltage regulating outgoing ends being led out from the voltage regulating coil;

[0008] A first insulating layer, the first insulating layer covering the outside of the voltage regulating coil lead-out group, and an accommodating space being formed inside the first insulating layer;

[0009] In a plane parallel to the cross-section of the voltage regulating outgoing ends, the accommodating space includes a length direction and a width direction. It is defined that the voltage regulating outgoing ends arranged on both sides of the length direction of the accommodating space are outer outgoing ends;

[0010] Shielding rods, the shielding rods being arranged in the outer outgoing ends, at least two shielding rods being arranged in each of the outer outgoing ends, and at least two shielding rods being arranged side by side along the width direction of the accommodating space, so that the edges of the outer outgoing ends form arcs;

[0011] The shielding rod and the same end of the outer lead are both connected to the same position of the transformer lead, and the shielding rod and the voltage regulating tap are insulated from each other.

[0012] In one embodiment, an insulating oil duct is provided in the voltage regulating coil lead-out group, and the insulating oil duct is arranged to penetrate along the extending direction of the voltage regulating tap.

[0013] In one embodiment, on a plane parallel to the cross-section of the voltage regulating tap, the insulating oil duct includes a longitudinal oil duct and transverse oil ducts arranged on both sides of the longitudinal oil duct. The longitudinal oil duct and the transverse oil ducts divide the accommodating space into four accommodating cavities, and two of the voltage regulating taps are arranged in each accommodating cavity.

[0014] In one embodiment, the insulating oil duct includes insulating paper boards, an oil-passing space is formed between the insulating paper boards, and the insulating paper boards are arranged in contact with the adjacent voltage regulating taps.

[0015] In one embodiment, the insulating oil duct further includes insulating protrusions. The insulating protrusions are installed on the insulating paper boards and are located in the oil-passing space. On the cross-section of the voltage regulating coil lead-out group, the insulating protrusions are uniformly arranged along the length direction of the insulating paper boards.

[0016] In one embodiment, the voltage regulating tap includes a second insulating layer and a voltage regulating wire core. The second insulating layer is coated on the outer side of the voltage regulating wire core to insulate multiple voltage regulating taps from each other.

[0017] In one embodiment, the shielding rod includes a rod body and a rod body insulating layer. The rod body insulating layer is coated on the outer side of the rod body.

[0018] In one embodiment, a cavity is formed inside the rod body.

[0019] In one embodiment, the extending direction of the shielding rod is the same as the extending direction of the voltage regulating tap.

[0020] In one embodiment, the transformer coil further includes a low-voltage coil, a medium-voltage coil and a high-voltage coil. The voltage regulating coil is arranged between the high-voltage coil and the medium-voltage coil, or between the medium-voltage coil and the low-voltage coil.

[0021] In the technical solution provided by the present utility model, the transformer coil lead shielding structure includes a transformer coil, a voltage regulating coil lead-out group, a first insulating layer, and shielding rods. Among them, the transformer coil includes a voltage regulating coil, the voltage regulating coil lead-out group includes a plurality of voltage regulating leads, and the voltage regulating leads are led out from the voltage regulating coil; the first insulating layer is coated on the outside of the voltage regulating coil lead-out group, and an accommodating space is formed inside the first insulating layer; in a plane parallel to the cross-section of the voltage regulating lead, the accommodating space includes a length direction and a width direction. It is defined that the voltage regulating leads arranged on both sides in the length direction of the accommodating space are outer leads; the shielding rods are arranged in the outer leads, and at least two shielding rods are arranged in each outer lead and are arranged side by side along the width direction of the accommodating space so that the edges of the outer leads form arcs; the same ends of the shielding rods and the outer leads are connected to the same position of the transformer lead, and the shielding rods and the voltage regulating leads are insulated from each other. By arranging the shielding rods side by side in the outer leads, the edges of the outer leads are changed into arc edges, and the shielding rods and the outer leads are crimped at the same position of the transformer lead, thereby achieving the effect of improving the electrical shape of the voltage regulating coil lead-out group with respect to the ground electrode and other live bodies. The technical solution provided by the present utility model does not require the use of aluminum foil that needs to be wrapped layer by layer and shaped to achieve the electrical shielding effect of the voltage regulating coil leads. The overall structure is simple and easy to process, and the processing quality can be guaranteed, thereby avoiding affecting the working stability of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0023] Figure 1 FIG. 1 is a schematic structural diagram of an embodiment of the transformer coil lead shielding structure provided by the present utility model;

[0024] Figure 2 FIG. Figure 1 is a schematic cross-sectional view of a partial structure in FIG. 1;

[0025] Figure 3 FIG. Figure 2 is an enlarged schematic view of part A in FIG. 1.

[0026] Explanation of the reference numerals in the drawings:

[0027] 100. Transformer coil end shielding structure; 1. Transformer coil; 11. Voltage regulating coil; 12. Low-voltage coil; 13. Medium-voltage coil; 14. High-voltage coil; 2. Voltage regulating coil lead-out group; 21. Voltage regulating end; 21a. Outer end; 211. Second insulating layer; 212. Voltage regulating wire core; 3. First insulating layer; 4. Shielding rod; 41. Rod body; 42. Rod body insulating layer; 5. Insulating oil duct; 5a. Longitudinal oil duct; 5b. Transverse oil duct; 51. Insulating cardboard; 52. Insulating protrusion; 6. Pressing ring.

[0028] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0029] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] 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.

[0031] In addition, if there are descriptions such as "first", "second", etc. 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", "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, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory 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.

[0032] Transformers play an important role in my country's power generation and transmission systems. The safety and stability of transformers have always been an important topic of research and innovation in related fields. In particular, the vigorous development of ultra-high voltage and ultra-high voltage transformers in recent years has put forward higher requirements for the safe use of transformers. Among them, improving the electric field distribution in the high-voltage part of the transformer and reducing the occurrence of partial discharge are one of the key points in transformer design, which has an important impact on the stability of the transformer during operation.

[0033] Considering the matching of the short-circuit impedance of the transformer, when a built-in voltage regulating coil structure is adopted, since the inside and outside of the voltage regulating coil are both transformer coil windings, the first and tail sections need to be led out from between the coils. The outlet of the built-in voltage regulating coil of the transformer is generally arranged centrally. When the transformer is running, it is easy to produce a temperature rise effect under the action of the electric field and current. If the outlet temperature is too high, the operating stability of the transformer will be affected. Therefore, it is generally adopted to change the electric field shape of the outlet itself by adding a shielding structure to the outlet to prevent local overheating of the transformer coil outlet.

[0034] According to the research of the applicant, the commonly used shielding structure is an aluminum foil layer structure or a metallized corrugated paper structure, that is, an aluminum foil layer or a metallized corrugated paper is used to cover the outermost voltage regulating coil head among multiple voltage regulating coil heads, so that the edge of the outermost voltage regulating coil head is changed into an arc shape, thereby improving the electrical shape of the voltage regulating coil relative to the ground. However, this method requires multiple layers of aluminum foil or metallized corrugated paper. Due to the high requirements for the filling and molding process of aluminum foil and metallized corrugated paper, the processing difficulty is relatively large, it is difficult to carry out standardized production, and the processing quality is difficult to guarantee. Therefore, it is difficult to ensure the shielding effect of the aluminum foil layer or the metallized corrugated paper layer on the voltage regulating coil head, which in turn affects the working stability of the transformer.

[0035] In view of this, the utility model proposes a transformer coil outlet shielding structure to solve the above technical problems.

[0036] See also Figure 1 and Figure 2, in an embodiment of the present utility model, the transformer coil lead shielding structure 100 includes a transformer coil 1, a voltage regulating coil lead-out group 2, a first insulating layer 3, and a shielding rod 4. Among them, the transformer coil 1 includes a voltage regulating coil 11, the voltage regulating coil lead-out group 2 includes a plurality of voltage regulating leads 21, and the voltage regulating leads 21 are led out from the voltage regulating coil 11; the first insulating layer 3 is coated on the outside of the voltage regulating coil lead-out group 2, and an accommodating space is formed inside the first insulating layer 3; in a plane parallel to the cross-section of the voltage regulating lead 21, the accommodating space includes a length direction and a width direction. It is defined that the voltage regulating leads 21 arranged on both sides of the length direction of the accommodating space are outer leads 21a; the shielding rods 4 are arranged in the outer leads 21a, and at least two shielding rods 4 are arranged in each outer lead 21a, and the at least two shielding rods 4 are arranged side by side along the width direction of the accommodating space, so that the edges of the outer lead 21a form an arc; the same ends of the shielding rods 4 and the outer leads 21a are connected to the same position of the transformer lead, and the shielding rods 4 and the voltage regulating leads 21 are insulated from each other.

[0037] Specifically, multiple voltage regulating leads 21 are concentratedly led out from the upper part of the voltage regulating coil 11. The multiple concentratedly led-out voltage regulating leads 21 are defined as the voltage regulating coil lead-out group 2. The voltage regulating coil lead-out group 2 is externally coated with a first insulating layer 3. A through hole is formed in the clamping ring 6 according to the size of the outer edge of the first insulating layer 3. The voltage regulating coil lead-out group 2 coated with the first insulating layer 3 passes through the through hole. After the voltage regulating coil lead-out group 2 leads out an appropriate length, the voltage regulating leads 21 are no longer coated with the first insulating layer 3, and each voltage regulating lead 21 is connected to its corresponding transformer lead. Since the voltage regulating leads 21 in the voltage regulating coil lead-out group 2 are arranged relatively concentratedly, in order to improve the electric field distribution of the voltage regulating coil lead-out group 2, electric shielding is required. A receiving space is formed inside the first insulating layer 3, and the voltage regulating leads 21 in the voltage regulating coil lead-out group 2 are all arranged in the receiving space. In any plane parallel to the cross-section of the voltage regulating lead 21, the receiving space includes a length direction and a width direction. Among them, the voltage regulating leads 21 arranged on both sides of the receiving space along the length direction are defined as the outer leads 21a, and the shielding rods 4 are arranged side by side in the outer leads 21a along the width direction of the receiving space. The shape of the shielding rod 4 is cylindrical, and the shielding rod 4 can extend and bend along with the outer lead 21a. In this embodiment, the number of voltage regulating leads 21 is eight. In the plane parallel to the cross-section of the voltage regulating lead 21, the voltage regulating leads 21 are arranged in four columns along the length direction of the receiving space, and each column includes two voltage regulating leads 21 arranged side by side. In each of the four outer leads 21a, two shielding rods 4 are respectively arranged. The two shielding rods 4 are arranged side by side along the width direction of the receiving space on the side of the outer lead 21a close to the first insulating layer 3, so that the shape of the side of the outer lead 21a close to the first insulating layer 3 is changed from the original edge to an arc edge, thereby realizing the adjustment of the electrical shape of the voltage regulating lead 21. In this embodiment, the arc edge on the side of the outer lead 21a where the shielding rod 4 is installed is composed of two rounded arcs along the width direction and at least one straight line connecting the two rounded arcs; in another embodiment, the arc edge is composed of two rounded arcs along the width direction and at least one arc connecting the two rounded arcs. In addition, in order to keep the shielding rod 4 and the outer lead 21a in the same phase, after the outer lead 21a leads out a certain length, it is connected to the connecting part of the transformer lead, and at the same time, the shielding rod 4 corresponding to the outer lead 21a is installed at the same position of the connecting part of the transformer lead by means of crimping, realizing the short circuit between the outer lead 21a and the shielding rod 4.

[0038] In the technical solution provided in this embodiment, the transformer coil end shielding structure 100 includes a transformer coil 1, a voltage regulating coil lead-out group 2, a first insulating layer 3, and a shielding rod 4. Among them, the transformer coil 1 includes a voltage regulating coil 11, the voltage regulating coil lead-out group 2 includes a plurality of voltage regulating leads 21, and the voltage regulating leads 21 are led out from the voltage regulating coil 11; the first insulating layer 3 is coated on the outside of the voltage regulating coil lead-out group 2, and an accommodation space is formed inside the first insulating layer 3; in a plane parallel to the cross-section of the voltage regulating lead 21, the accommodation space includes a length direction and a width direction. It is defined that the voltage regulating leads 21 arranged on both sides of the length direction of the accommodation space are the outer leads 21a; the shielding rod 4 is arranged in the outer leads 21a, and the shielding rods 4 are arranged side by side along the width direction of the accommodation space so that the edges of the outer leads 21a form an arc; the same ends of the shielding rod 4 and the outer lead 21a are connected to the same position of the transformer lead, and the shielding rod 4 and the voltage regulating lead 21 are insulated from each other. By arranging the shielding rods 4 side by side in the outer lead 21a, the edges of the outer lead 21a are changed into arc edges, and the shielding rod 4 and the outer lead 21a are crimped at the same position of the transformer lead, so as to improve the electrical shape of the voltage regulating coil lead-out group 2 with respect to the ground electrode and other charged bodies. The technical solution provided by the present utility model does not require the use of aluminum foil that needs to be wrapped layer by layer and shaped to achieve the electrical shielding effect of the voltage regulating lead 11. The overall structure is simple and easy to process, and the processing quality can be guaranteed, thereby avoiding affecting the working stability of the transformer.

[0039] On the other hand, by adopting the technical solution provided in this embodiment, on the basis of ensuring the improvement of the electrical shape, it is possible to avoid using a large amount of aluminum foil or metallized crimped paper to shield the voltage regulating lead 21, so that the overall thickness of the voltage regulating lead 21 can be controlled, which is beneficial to the heat dissipation of the voltage regulating lead 21 and avoids the reduction of the overload tolerance of the transformer due to poor heat dissipation.

[0040] Furthermore, in an embodiment of the present utility model, an insulating oil duct 5 is provided in the voltage regulating coil lead-out group 2, and the insulating oil duct 5 is arranged to penetrate along the extending direction of the voltage regulating lead 21. Specifically, the insulating oil duct 5 penetrates through the accommodation space formed by the first insulating layer 3, and its extending direction is the same as the extending direction of the voltage regulating lead 21 to increase the contact area between the transformer oil and the voltage regulating lead 21. The transformer oil can flow in the insulating oil duct 5, so that the heat in the voltage regulating lead 21 enters the transformer oil through heat exchange, thereby reducing the heat in the voltage regulating lead 21 and improving the heat dissipation efficiency of the voltage regulating lead 21, which helps to improve the overload tolerance of the transformer.

[0041] In an embodiment of the present utility model, in a plane parallel to the cross-section of the voltage regulating tap 21, the insulating oil duct 5 includes a longitudinal oil duct 5a and transverse oil ducts 5b arranged on both sides of the longitudinal oil duct 5a. The longitudinal oil duct 5a and the transverse oil ducts 5b divide the accommodating space into four accommodating cavities, and two voltage regulating taps 21 are arranged in each accommodating cavity. For details, please refer to Figure 2 And Figure 3 , the longitudinal oil duct 5a and the transverse oil ducts 5b evenly divide the accommodating space into four accommodating cavities. There are two longitudinal oil ducts 5a arranged side by side. Two transverse oil ducts 5b are respectively arranged on both sides of the longitudinal oil duct 5a. The longitudinal oil duct 5a and the transverse oil ducts 5b are perpendicularly arranged and do not communicate with each other. Transformer oil can flow in a direction perpendicular to the cross-section of the voltage regulating tap 21, flowing in from the top of the accommodating space and flowing out from its bottom.

[0042] Obviously, there is more than one implementation form of the longitudinal oil duct 5a and the transverse oil ducts 5b. In another embodiment of the present utility model, there are three longitudinal oil ducts 5a, and each longitudinal oil duct 5a is arranged between two adjacent columns of voltage regulating taps 21. There are four transverse oil ducts 5b arranged between the three longitudinal oil ducts 5a and the first insulating layer 3. In this way, the accommodating space is divided into eight accommodating cavities, and one voltage regulating tap 21 is arranged in each accommodating cavity. This setting can significantly increase the flowing volume of transformer oil between the voltage regulating taps 21, thereby further improving the heat dissipation efficiency of the voltage regulating tap 21.

[0043] In yet another embodiment of the present utility model, there is one transverse oil duct 5b, and two longitudinal oil ducts 5a are arranged on both sides of the transverse oil duct 5b. The longitudinal oil ducts 5b and the transverse oil duct 5a evenly divide the accommodating space into four accommodating cavities, and two voltage regulating taps 21 are arranged in each accommodating cavity.

[0044] Furthermore, in an embodiment of the present utility model, the insulating oil duct 5 includes insulating cardboard 51. An oil passing space is formed between the insulating cardboard 51, and the insulating cardboard 51 is attached to the adjacent voltage regulating tap 21. The insulating cardboard 51 forms the oil passing space, and transformer oil flows between the insulating cardboard 51. The heat in the voltage regulating tap 21 is transferred to the transformer oil through the insulating cardboard 51.

[0045] On this basis, in an embodiment of the present utility model, the insulating oil duct 5 further includes insulating protrusions 52. The insulating protrusions 52 are installed on the insulating cardboard 51 and are located in the oil passing space. In the cross-section of the voltage regulating coil lead-out group 2, the insulating protrusions 52 are evenly distributed along the length direction of the insulating cardboard 51. For details, please refer to Figure 2 And Figure 3, on the plane parallel to the cross-section of the voltage regulating tap 21, the direction in which the insulating cardboard 51 extends on this plane is the length direction. The insulating protrusions 52 are arranged in the oil passing space and are evenly spaced along the length direction of the insulating cardboard 51. Through this arrangement, the heat dissipation area of the voltage regulating tap 21 is increased, and the heat dissipation efficiency inside the voltage regulating tap 21 is further improved, thereby avoiding the generation of local hot spots.

[0046] In an embodiment of the present invention, the voltage regulating tap 21 includes a second insulating layer 211 and a voltage regulating wire core 212. The second insulating layer 211 is coated on the outside of the voltage regulating wire core 212 to insulate the plurality of voltage regulating taps 21 from each other. The voltage regulating coil 11 of the transformer has the function of adjusting the output voltage magnitude. When adjusting the voltage, it is necessary to adjust the voltage regulating tap 21 connected to the circuit. Therefore, each voltage regulating tap 21 needs to be insulated to avoid short circuit and ensure the safe and stable operation of the transformer. The second insulating layer 211 can effectively isolate each voltage regulating tap 21, and its material is selected according to the insulation grade during the design of the transformer, and its insulation strength can prevent short circuit between each voltage regulating tap 21.

[0047] In an embodiment of the present invention, the shielding rod 4 includes a rod body 41 and a rod body insulating layer 42. The rod body insulating layer 42 is coated on the outside of the rod body 41. To make the phase of the shielding rod 4 and its corresponding voltage regulating tap 21, that is, the shielding rod 4 and the outer tap 21a, the same, the two are only short-circuited by crimping when connected to the transformer lead. To avoid the phenomenon of short circuit, the conductive metal part of the shielding rod 4, that is, the rod body 41, needs to be insulated from the outer tap 21a. Therefore, a rod body insulating layer 42 needs to be provided on the outside of the rod body 41. Among them, the rod body 41 is cylindrical, the extending direction of the rod body 41 is the same as the extending direction of its corresponding outer tap 21a, the rod body insulating layer 42 is evenly coated on the outside of the rod body 41, and the rod body insulating layer 42 is concentric with the rod body 41. The shielding rod 4 is closely arranged against the voltage regulating wire core 212 of the outer tap 21a, and the second insulating layer 211 corresponding to the outer tap 21a is simultaneously coated on the outside of the shielding rod 4 and the voltage regulating wire core 212, so that the edge of the outer tap 21a becomes a rounded edge.

[0048] Furthermore, a cavity is formed inside the rod body 41. Specifically, the rod body 41 adopts a hollow structure. Compared with the solid structure, this arrangement can reduce the use of materials, reduce the weight and cost of the structure while maintaining the same shielding strength; in addition, the rod body 41 adopting a hollow structure can be used as a heat dissipation channel, which is beneficial to the dissipation of heat in the outer tap 21a, thereby improving the heat dissipation efficiency of the outer tap 21a.

[0049] In an embodiment of the present utility model, the extending direction of the shielding rod 4 is the same as that of the voltage regulating tap 21. The material for manufacturing the rod body 41 in the shielding rod 4 needs to have good electrical conductivity and a certain degree of flexibility so that it can be bent along with the bending of the voltage regulating tap 21. The material for manufacturing the rod body 41 includes one of copper, aluminum, aluminum-iron alloy, and conductive polymer (such as PEDOT). At the same time, the rod body insulating layer 42 needs to have a certain degree of flexibility to adapt to the bending angle of the voltage regulating tap 21.

[0050] In an embodiment of the present utility model, the transformer coil 1 further includes a low-voltage coil 12, a medium-voltage coil 13, and a high-voltage coil 14. The voltage regulating coil 11 is disposed between the high-voltage coil 14 and the medium-voltage coil 13, or between the medium-voltage coil 13 and the low-voltage coil 12. Please refer to Figure 1 , when an on-load voltage regulating design is adopted for an extra-high voltage transformer, some transformers consider the requirement of the system's short-circuit resistance capacity and have a relatively large requirement for the short-circuit impedance value in the transformer performance parameters. At this time, in order to meet the requirements of transformer performance and material cost, during the transformer design, it is usually necessary to dispose the voltage regulating coil 11 between the high-voltage coil 14 and the medium-voltage coil 13, or the voltage regulating coil 11 can also be disposed between the medium-voltage coil 13 and the low-voltage coil 12 according to actual requirements. When the voltage regulating coil 11 is disposed between any two of the high-voltage coil 14, the medium-voltage coil 13, and the low-voltage coil 12, the compactness of the transformer can be improved, and at the same time, the material usage amount in the voltage regulating coil 11 can be reduced.

[0051] The above is only an exemplary embodiment of the present utility model, and thus does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A shielding structure for the lead of a transformer coil, characterized in that Comprising: A transformer coil, the transformer coil including a voltage regulating coil; A voltage regulating coil lead-out group, the voltage regulating coil lead-out group including a plurality of voltage regulating leads, the voltage regulating leads being led out from the voltage regulating coil; A first insulating layer, the first insulating layer covering the outside of the voltage regulating coil lead-out group, an accommodation space being formed inside the first insulating layer; On a plane parallel to the cross-section of the voltage regulating lead, the accommodation space includes a length direction and a width direction. Definition: The voltage regulating leads arranged on both sides of the length direction of the accommodation space are defined as outer leads; Shielding rods, the shielding rods being arranged in the outer leads, at least two shielding rods being arranged in each of the outer leads, and at least two shielding rods being arranged side by side along the width direction of the accommodation space so that the edges of the outer leads form arcs; The same ends of the shielding rods and the outer leads are connected to the same position of the transformer lead, and insulation is provided between the shielding rods and the voltage regulating leads.

2. The transformer coil end shielding structure according to claim 1, wherein An insulating oil duct is provided in the voltage regulating coil lead-out group, and the insulating oil duct is arranged to penetrate along the extending direction of the voltage regulating lead.

3. The transformer coil end shielding structure according to claim 2, wherein, On a plane parallel to the cross-section of the voltage regulating lead, the insulating oil duct includes a longitudinal oil duct and transverse oil ducts arranged on both sides of the longitudinal oil duct. The longitudinal oil duct and the transverse oil ducts divide the accommodation space into four accommodation cavities, and two voltage regulating leads are arranged in each accommodation cavity.

4. The transformer coil lead shielding structure according to claim 2, characterized in that, The insulating oil duct includes insulating paper boards, an oil-passing space being formed between the insulating paper boards, and the insulating paper boards being arranged in contact with the adjacent voltage regulating leads.

5. The transformer coil lead shielding structure according to claim 4, characterized in that, The insulating oil duct further includes insulating protrusions, the insulating protrusions being installed on the insulating paper boards and located in the oil-passing space. On the cross-section of the voltage regulating coil lead-out group, the insulating protrusions are uniformly arranged along the length direction of the insulating paper boards.

6. The transformer coil end shielding structure according to any one of claims 1 to 5, characterized in that, The voltage regulating lead includes a second insulating layer and a voltage regulating wire core, the second insulating layer covering the outside of the voltage regulating wire core so that insulation is provided between the plurality of voltage regulating leads.

7. The transformer coil lead shielding structure according to any one of claims 1 to 5, characterized in that, The shielding rod includes a rod body and a rod body insulating layer, the rod body insulating layer covering the outside of the rod body.

8. The transformer coil lead shielding structure according to claim 7, characterized in that, A cavity is formed inside the rod body.

9. The transformer coil lead shielding structure according to any one of claims 1 to 5, characterized in that The extending direction of the shielding rod is the same as the extending direction of the voltage regulating lead.

10. The transformer coil lead shielding structure according to any one of claims 1 to 5, characterized in that, The transformer coil further includes a low-voltage coil, a medium-voltage coil and a high-voltage coil, the voltage regulating coil being arranged between the high-voltage coil and the medium-voltage coil, or being arranged between the medium-voltage coil and the low-voltage coil.

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