Transformer

Abstract

The utility model belongs to the technical field of electrical equipment, and discloses a transformer which comprises a high-voltage winding, a low-voltage winding and an iron core, the high-voltage winding comprises multiple layers of first winding structures, and the low-voltage winding comprises multiple layers of second winding structures; at least one layer in M layers, close to the low-voltage winding, in the first winding structure is provided with a first temperature measuring piece at a preset position; and / or at least one layer in the N layers, deviating from the low-voltage winding, in the first winding structure is provided with a second temperature measuring piece at a preset position; and / or at least one layer in the R layers, close to the iron core, in the second winding structure is provided with a third temperature measuring piece at a preset position; and / or at least one layer in the S layers, close to the high-voltage winding, in the second winding structure is provided with a fourth temperature measuring piece at a preset position; and / or a fifth temperature measuring piece is arranged on the surface of the iron core; m, N, R and S are all positive integers larger than or equal to 1 and smaller than or equal to 5. And the temperature measuring pieces are clamped and fixed through the slotted sheets. The transformer can accurately and reliably monitor the temperature rise condition of the hottest point in the transformer, and safe operation of the transformer is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a transformer. Background Art

[0002] The transformer is one of the core equipment of the power system. Thermal failure of the transformer is a common type of failure during its operation. Therefore, it is very important to monitor the internal temperature of the transformer during operation. The transformer includes an iron core, a high-voltage winding and a low-voltage winding. The high-voltage winding is set outside the low-voltage winding, and the low-voltage winding is set outside the iron core. The temperature of the iron core, high-voltage winding and low-voltage winding affects the insulation performance and life aging speed of the internal insulation components of the transformer. When the temperature is too high, it will accelerate the aging of the internal insulation components of the transformer, reduce the service life of the transformer, and affect the safe operation of the entire power system. When the winding temperature is too low, it will affect the load capacity of the transformer. Therefore, it is very important to monitor the temperature of the iron core, high-voltage winding and low-voltage winding.

[0003] In existing transformers, although temperature probes for monitoring temperature changes are arranged on the iron core, high-voltage winding and low-voltage winding, the arrangement position of the temperature probes cannot accurately monitor the temperature rise at the hottest points of the high-voltage winding and the low-voltage winding, and cannot make high-temperature warnings in time, nor can they accurately reflect the operating status of the transformer, and the operating safety of the transformer cannot be guaranteed.

[0004] Therefore, there is an urgent need for a transformer to solve the above problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide a transformer, which can accurately and reliably monitor the temperature rise of the hottest point inside the transformer, and make a high temperature warning in time to ensure the operation safety of the transformer.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] Provided is a transformer, comprising a high-voltage winding, a low-voltage winding, and an iron core, wherein the high-voltage winding is sleeved on the low-voltage winding, and the low-voltage winding is sleeved on the iron core; the high-voltage winding comprises a multi-layer first winding structure sequentially arranged from the inside to the outside, and the low-voltage winding comprises a multi-layer second winding structure sequentially arranged from the inside to the outside;

[0008] The transformer further comprises a first slot having a slot; the first slot is arranged at a preset position of a first target layer in the first winding structure, the first target layer is at least one layer of the M layers in the first winding structure close to the low-voltage winding, and the slot of the first slot is engaged with a first temperature measuring component; and / or,

[0009] The transformer further includes a second slot having a slot; the second slot is arranged at a preset position of a second target layer in the first winding structure, the second target layer is at least one layer of the N layers in the first winding structure away from the low-voltage winding, and the slot of the second slot is engaged with a second temperature measuring component; and / or,

[0010] The transformer further includes a third slot having a slot; the third slot is arranged at a preset position of a third target layer in the second winding structure, the third target layer is at least one layer of the R layer close to the iron core in the second winding structure, and the slot of the third slot is engaged with a third temperature measuring component; and / or,

[0011] The transformer further includes a fourth slot having a slot; the fourth slot is arranged at a preset position of a fourth target layer in the second winding structure, the fourth target layer is at least one layer of the S layer in the second winding structure close to the high-voltage winding, and the slot of the fourth slot is engaged with a fourth temperature measuring component; and / or,

[0012] The transformer further comprises a fifth slot plate having a slot; a fifth temperature measuring member is engaged with the surface of the iron core through the slot of the fifth slot plate;

[0013] Among them, M, N, R, and S are all positive integers greater than or equal to 1 and less than or equal to 5.

[0014] As a preferred solution of the transformer provided by the utility model, the high-voltage winding includes a high-voltage winding wire, and the high-voltage winding wire is spirally wound multiple times to form the first winding structure;

[0015] The high-voltage winding includes a copper wire and a first insulating heat-resistant layer wrapped around the copper wire. The conductivity of the copper wire meets 95% to 103.5%, and the heat resistance grade of the first insulating heat-resistant layer is greater than or equal to F grade.

[0016] As a preferred embodiment of the transformer provided by the utility model, at least two second insulating and heat-resistant layers are provided on the side of the innermost first winding structure facing the low-voltage winding, and the innermost first winding structure is the first winding structure in the first target layer that is closest to the low-voltage winding; and / or,

[0017] At least two third insulating and heat-resistant layers are provided on the side of the outermost layer of the first winding structure facing away from the low-voltage winding, and the outermost layer of the first winding structure is the first winding structure farthest from the low-voltage winding in the second target layer; and / or,

[0018] The innermost layer of the second winding structure is provided with at least two fourth insulating heat-resistant layers on the side facing the iron core, and the innermost layer of the second winding structure is the layer of the second winding structure closest to the iron core in the third target layer; and / or,

[0019] At least two fifth insulating and heat-resistant layers are provided on the side of the outermost layer of the second winding structure facing away from the iron core, and the outermost layer of the second winding structure is the layer of the second winding structure closest to the high-voltage winding in the fourth target layer; and / or,

[0020] The heat resistance grades of the second insulating heat-resistant layer, the third insulating heat-resistant layer, the fourth insulating heat-resistant layer and the fifth insulating heat-resistant layer are all greater than or equal to Grade F.

[0021] As a preferred solution of the transformer provided by the utility model, the transformer further includes two clamping assemblies respectively arranged at both ends of the iron core, the high voltage winding and the low voltage winding are both located between the two clamping assemblies, the iron core includes a plurality of iron core sheets stacked one on another, and the clamping assemblies are used to clamp the plurality of iron core sheets;

[0022] An insulating support block is sandwiched between the high-voltage winding and the low-voltage winding and the corresponding clamping assembly, and the heat resistance grade of the insulating support block is greater than or equal to grade F.

[0023] As a preferred solution of the transformer provided by the utility model, the material of the core sheet is magnetic silicon steel; and / or the material of the clamping assembly is non-magnetic steel.

[0024] As a preferred solution of the transformer provided by the utility model, the fifth slot and the fifth temperature measuring component are clamped between the clamping assembly and the iron core.

[0025] As a preferred embodiment of the transformer provided by the utility model, an accommodation gap is provided between the high-voltage winding and the low-voltage winding, and a support bar is provided in the accommodation gap; the innermost layer of the second winding structure is connected to the first lead wire, and the outermost layer of the second winding structure is connected to the second lead wire; the innermost layer of the second winding structure is the layer of the second winding structure closest to the iron core in the third target layer, and the outermost layer of the second winding structure is the layer of the second winding structure closest to the high-voltage winding in the fourth target layer;

[0026] The first slot is sandwiched between the support bar and the innermost first winding structure, and the innermost first winding structure is a layer of the first winding structure in the first target layer that is closest to the low-voltage winding; and / or,

[0027] The second slot sheet is sandwiched between two adjacent layers of the first winding structure; and / or,

[0028] The third slot is sandwiched between the first lead and the iron core; and / or,

[0029] The fourth slot is sandwiched between the second lead and the support bar.

[0030] As a preferred solution of the transformer provided by the utility model, the shape of the first slot is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or,

[0031] The shape of the second groove piece is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or,

[0032] The shape of the third groove piece is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or,

[0033] The shape of the fourth groove piece is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or,

[0034] The shape of the fifth groove piece is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped.

[0035] As a preferred solution of the transformer provided by the utility model, the material of the first slot sheet is insulating heat-resistant paper with a heat resistance grade greater than or equal to F grade; and / or,

[0036] The material of the second slot sheet is insulating heat-resistant paper with a heat resistance grade greater than or equal to grade F; and / or,

[0037] The material of the third slot sheet is insulating heat-resistant paper with a heat resistance grade greater than or equal to grade F; and / or,

[0038] The material of the fourth slot sheet is insulating heat-resistant paper with a heat resistance grade greater than or equal to grade F; and / or,

[0039] The material of the fifth slot sheet is insulating heat-resistant paper with a heat resistance grade greater than or equal to F grade.

[0040] As a preferred solution of the transformer provided by the utility model, an insulating medium is filled between the inner wall of the slot of the first slot sheet and the first temperature measuring element; and / or,

[0041] An insulating medium is filled between the inner wall of the slot of the second slot and the second temperature measuring element; and / or,

[0042] An insulating medium is filled between the inner wall of the slot of the third slot and the third temperature measuring element; and / or,

[0043] An insulating medium is filled between the inner wall of the slot of the fourth slot and the fourth temperature measuring element; and / or,

[0044] An insulating medium is filled between the inner wall of the slot of the fifth slot and the fifth temperature measuring component.

[0045] Beneficial effects of the utility model:

[0046] The utility model provides a transformer, wherein the high-voltage winding includes a multi-layer first winding structure arranged sequentially from the inside to the outside. During the operation of the transformer, the innermost and outermost layers of the high-voltage winding are the positions with the highest temperature rise. By arranging a first temperature measuring component on at least one layer of the M-layer first winding structure of the high-voltage winding close to the low-voltage winding, and arranging a second temperature measuring component on at least one layer of the N-layer first winding structure away from the low-voltage winding, the position with the highest temperature rise of the high-voltage winding can be accurately monitored. The low-voltage winding includes a multi-layer second winding structure arranged sequentially from the inside to the outside. During the operation of the transformer, the innermost and outermost layers of the low-voltage winding are the positions with the highest temperature rise. By arranging a third temperature measuring component on at least one layer of the R-layer second winding structure of the low-voltage winding close to the iron core, and arranging a fourth temperature measuring component on at least one layer of the S-layer second winding structure close to the high-voltage winding, the position with the highest temperature rise of the low-voltage winding can be accurately monitored. The temperature rise of the iron core can be monitored in real time by the fifth temperature measuring component arranged on the iron core. Moreover, the temperature measuring component is engaged in the slot on the slot, making the installation of the temperature measuring component more stable and reliable. The slot can also prevent other structures from squeezing and damaging the temperature measuring component, thereby protecting the temperature measuring component. This enables the temperature measuring component to more accurately and reliably monitor the temperature rise at the hottest point inside the transformer, which is conducive to timely high temperature warning and ensuring the safe operation of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a first view of the transformer provided by the specific implementation mode of the utility model;

[0048] Figure 2 It is a schematic diagram of a transformer with an oil tank hidden in a specific embodiment of the utility model;

[0049] Figure 3 It is an axonometric diagram of a high voltage winding and a low voltage winding provided by a specific embodiment of the utility model;

[0050] Figure 4 It is a second view of the transformer provided by the specific implementation mode of the utility model;

[0051] Figure 5 yes Figure 4 A partial enlarged view of the middle A;

[0052] Figure 6 It is a schematic diagram of the arrangement of temperature measuring components on high-voltage windings and low-voltage windings provided in a specific embodiment of the utility model;

[0053] Figure 7 It is a schematic diagram of a second slot and a second temperature measuring member provided in a specific embodiment of the utility model;

[0054] Figure 8 It is a third view of the transformer provided by the specific implementation mode of the utility model;

[0055] Fig. 9 It is a structural schematic diagram of a high voltage winding provided by a specific implementation mode of the utility model;

[0056] Fig.10 It is a structural schematic diagram of a low-voltage winding provided by a specific implementation method of the utility model;

[0057] Fig.11 It is a top view of a high voltage winding and a low voltage winding provided by a specific embodiment of the utility model;

[0058] Fig.12 It is an axonometric diagram of the iron core provided by the specific implementation mode of the utility model;

[0059] Fig.13 It is an exploded schematic diagram of the iron core provided by the specific implementation mode of the utility model;

[0060] Fig.14 yes Fig.13 A partial enlarged view of point B in the middle;

[0061] Fig.15 It is a schematic diagram of a clamping assembly provided in a specific embodiment of the utility model.

[0062] In the figure:

[0063] 1. High voltage winding; 2. Low voltage winding; 3. Iron core; 6. Clamping assembly; 7. Insulation support block; 8. Accommodation gap; 10. Temperature detection interface; 20. Oil tank; 50. Support bar;

[0064] 11. First winding structure; 12. High voltage winding;

[0065] 21. second winding structure; 22. first lead wire; 23. second lead wire;

[0066] 30. Single-stage iron chip assembly; 31. Upper yoke; 32. Lower yoke; 33. Side column; 34. Core column; 311. Overlap groove;

[0067] 40, card slot; 41, second slot piece; 42, third slot piece; 43, fourth slot piece;

[0068] 51, first temperature measuring element; 52, second temperature measuring element; 53, third temperature measuring element; 54, fourth temperature measuring element;

[0069] 511, a first signal transmission line; 521, a second signal transmission line; 531, a third signal transmission line; 541, a fourth signal transmission line; 551, a fifth signal transmission line;

[0070] 61. first clamp; 62. second clamp; 63. fixed beam;

[0071] 611, first rod body; 6111, connecting hole; 612, second rod body;

[0072] 631.Fixing hole. DETAILED DESCRIPTION

[0073] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0074] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0076] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0077] like Figure 1 , Figure 2 as well as Figure 3, which is a schematic diagram of the transformer provided in the present embodiment, or a partial schematic diagram thereof, wherein the transformer comprises an oil tank 20 and a high voltage winding 1, a low voltage winding 2 and an iron core 3 arranged in the oil tank 20. The high voltage winding 1 is sleeved on the low voltage winding 2, and the low voltage winding 2 is sleeved on the iron core 3.

[0078] See also Figure 4 , Figure 5 as well as Figure 6 , the high-voltage winding 1 includes a plurality of first winding structures 11 arranged in sequence from the inside to the outside, and the low-voltage winding 2 includes a plurality of second winding structures 21 arranged in sequence from the inside to the outside. Among them, the second winding structure 21 of the low-voltage winding 2 closest to the iron core 3 is the innermost second winding structure 21 of the low-voltage winding 2, and the second winding structure 21 closest to the high-voltage winding 1 is the outermost second winding structure 21 of the low-voltage winding 2; the first winding structure 11 of the high-voltage winding 1 closest to the low-voltage winding 2 is the innermost first winding structure 11 of the high-voltage winding 1, and the first winding structure 11 of the high-voltage winding 1 farthest from the low-voltage winding 2 is the outermost first winding structure 11 of the high-voltage winding 1.

[0079] Combination Figure 5 , Figure 6 as well as Figure 7 The transformer further includes a first slot sheet (not shown), a second slot sheet 41, a third slot sheet 42, a fourth slot sheet 43 and a fifth slot sheet (not shown), and the first slot sheet, the second slot sheet 41, the third slot sheet 42, the fourth slot sheet 43 and the fifth slot sheet are all provided with a card slot 40.

[0080] For the high-voltage winding 1, the first slot is arranged at a preset position of the first target layer in the first winding structure 11. The first target layer is at least one of the M layers in the first winding structure 11 close to the low-voltage winding 2. A first temperature measuring component 51 is engaged in the slot 40 of the first slot. Moreover, the second slot 41 is arranged at a preset position of the second target layer in the first winding structure 11. The second target layer is at least one of the N layers in the first winding structure 11 away from the low-voltage winding 2. A second temperature measuring component 52 is engaged in the slot 40 of the second slot 41. The above-mentioned preset position includes the position of the highest temperature rise point. Optionally, the first slot and the first temperature measuring component 51 are arranged at the position of the highest temperature rise point of the first target layer; the second slot 41 and the second temperature measuring component 52 are arranged at the position of the highest temperature rise point of the second target layer. Wherein, M and N are both positive integers greater than or equal to 1 and less than or equal to 5. That is, the first temperature measuring element 51 can be provided on the first layer, the second layer, the third layer, the fourth layer and the fifth layer of the first winding structure 11 from the inside to the outside, and one or more first temperature measuring elements 51 can be provided. The second temperature measuring element 52 can be provided on the first layer, the second layer, the third layer, the fourth layer and the fifth layer of the first winding structure 11 from the outside to the inside, and one or more second temperature measuring elements 52 can be provided.

[0081] During the operation of the transformer, the innermost and outermost layers of the high-voltage winding 1 are the positions with the highest temperature rise. By setting a first temperature measuring component 51 on at least one layer of the M-layer first winding structure 11 of the high-voltage winding 1 close to the low-voltage winding 2, and setting a second temperature measuring component 52 on at least one layer of the N-layer first winding structure 11 away from the low-voltage winding 2, and making the first temperature measuring component 51 and the second temperature measuring component 52 both arranged at the highest temperature rise point of the corresponding first winding structure 11, the position with the highest temperature rise of the high-voltage winding 1 can be accurately monitored.

[0082] The highest temperature rise point on the above-mentioned first winding structure 11 can be obtained according to the hot spot temperature rise simulation calculation, or obtained through the hot spot temperature rise test. By way of example, the two axial end faces of the high-voltage winding 1 are both defined as the first end faces, and the first winding structure 11 is 50 mm away from the first end face as the highest temperature rise point. The first temperature measuring component 51 can be fixed by the first slot at a position 50 mm away from the first end face on the corresponding first winding structure 11, or the second temperature measuring component 52 can be fixed by the second slot 41.

[0083] For the low-voltage winding 2, the third slot 42 is arranged at a preset position of the third target layer in the second winding structure 21. The third target layer is at least one layer of the R layer close to the iron core 3 in the second winding structure 21. A third temperature measuring component 53 is engaged in the slot 40 of the third slot 42. The fourth slot 43 is arranged at a preset position of the fourth target layer in the second winding structure 21. The fourth target layer is at least one layer of the S layer close to the high-voltage winding 1 in the second winding structure 21. A fourth temperature measuring component 54 is engaged in the slot 40 of the fourth slot 43. The above-mentioned preset position includes the position of the highest temperature rise point. Optionally, the third slot 42 and the third temperature measuring component 53 are arranged at the position of the highest temperature rise point of the third target layer; the fourth slot 43 and the fourth temperature measuring component 54 are arranged at the position of the highest temperature rise point of the fourth target layer. Wherein, R and S are both positive integers greater than or equal to 1 and less than or equal to 5. That is, the third temperature measuring element 53 can be provided on the first, second, third, fourth and fifth second winding structures 21 from the inside to the outside, and one or more third temperature measuring elements 53 can be provided. The fourth temperature measuring element 54 can be provided on the first, second, third, fourth and fifth second winding structures 21 from the outside to the inside, and one or more fourth temperature measuring elements 54 can be provided.

[0084] During the operation of the transformer, the innermost and outermost layers of the low-voltage winding 2 are the positions with the highest temperature rise. By setting a third temperature measuring component 53 on at least one layer of the R-layer second winding structure 21 of the low-voltage winding 2 close to the core 3, and setting a fourth temperature measuring component 54 on at least one layer of the S-layer second winding structure 21 close to the high-voltage winding 1, and the third temperature measuring component 53 and the fourth temperature measuring component 54 are both arranged at the highest temperature rise point of the corresponding second winding structure 21, the position with the highest temperature rise of the low-voltage winding 2 can be accurately monitored.

[0085] The highest temperature rise point on the above-mentioned second winding structure 21 can be obtained based on the hot spot temperature rise simulation calculation, or obtained through the hot spot temperature rise test. By way of example, the two axial end faces of the low-voltage winding 2 are both defined as the second end faces, and the second winding structure 21 is 100 mm away from the second end face as the highest temperature rise point. On the corresponding second winding structure 21, at a position 100 mm away from the second end face, the third temperature measuring component 53 is fixed by the third slot 42, or the fourth temperature measuring component 54 is fixed by the fourth slot 43.

[0086] Exemplarily, the high voltage winding 1 includes at least 10 layers of first winding structures 11, and the low voltage winding 2 includes at least 10 layers of second winding structures 21. For example, the high voltage winding 1 includes 16 layers of first winding structures 11, and the low voltage winding 2 includes 20 layers of second winding structures 21.

[0087] A fifth temperature measuring element (not shown) is engaged with the surface of the iron core 3 through the slot 40 of the fifth slot; the temperature rise of the iron core 3 can be monitored in real time through the fifth temperature measuring element arranged on the iron core 3 .

[0088] By installing temperature measuring components at designated locations of the high-voltage winding 1, the low-voltage winding 2 and the iron core 3, the locations with the highest hot spot temperatures in the transformer can be effectively covered, thereby controlling the risk of transformer explosion caused by excessive temperature rise of local hot spots of the transformer from the source, thereby avoiding damage to the power grid system and personnel.

[0089] Moreover, the temperature measuring component is engaged in the slot 40 on the slot, making the installation of the temperature measuring component more stable and reliable. The slot can also prevent other structures from squeezing and damaging the temperature measuring component, thereby protecting the temperature measuring component. The temperature measuring component can more accurately and reliably monitor the temperature rise at the hottest point inside the transformer, which is conducive to timely high temperature warning and ensuring the safe operation of the transformer.

[0090] Exemplarily, the first temperature measuring element 51, the second temperature measuring element 52, the third temperature measuring element 53, the fourth temperature measuring element 54 and the fifth temperature measuring element all include optical fiber temperature measuring probes, which have high temperature measurement accuracy and strong anti-electromagnetic interference capability. The optical fiber temperature measuring probes are mounted in the card slots 40 of the corresponding slots.

[0091] See also Figure 4 and Figure 5 The first temperature measuring element 51 is connected to a first signal transmission line 511, the second temperature measuring element 52 is connected to a second signal transmission line 521, the third temperature measuring element 53 is connected to a third signal transmission line 531, the fourth temperature measuring element 54 is connected to a fourth signal transmission line 541, and the fifth temperature measuring element is connected to a fifth signal transmission line 551. The fuel tank 20 is provided with a plurality of temperature detection interfaces 10 (such as Figure 8 As shown), multiple temperature detection interfaces 10 include a first temperature detection interface, a second temperature detection interface, a third temperature detection interface, a fourth temperature detection interface, and a fifth temperature detection interface. Among them, the first signal transmission line 511 extends to pass through the first temperature detection interface, the second signal transmission line 521 extends to pass through the second temperature detection interface, the third signal transmission line 531 extends to pass through the third temperature detection interface, the fourth signal transmission line 541 extends to pass through the fourth temperature detection interface, and the fifth signal transmission line 551 extends to pass through the fifth temperature detection interface. The first signal transmission line 511, the second signal transmission line 521, the third signal transmission line 531, the fourth signal transmission line 541, and the fifth signal transmission line 551 are all connected to the data transmission harness after passing through the corresponding temperature detection interface 10, and the real-time temperature signal can be directly uploaded to the measurement and control equipment and the background instrument, which is convenient for the operation and maintenance personnel to monitor and adjust the load value, and can effectively control the transformer explosion problem caused by excessive temperature rise of the local hot spot of the transformer from the source.

[0092] In some embodiments, the shape of the first slot piece is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or, the shape of the second slot piece 41 is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or, the shape of the third slot piece 42 is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or, the shape of the fourth slot piece 43 is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or, the shape of the fifth slot piece is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped. The above-mentioned quasi-U-shaped or quasi-V-shaped refers to a shape that is approximately U-shaped or approximately V-shaped.

[0093] U-shaped, U-shaped, V-shaped, or V-shaped slots are easy to manufacture, for example, by cutting and forming. Moreover, the slots 40 on the slots of the above shapes are also correspondingly U-shaped, U-shaped, V-shaped, or V-shaped, which is convenient for engaging the temperature measuring component.

[0094] See also Figure 7 Taking the second slot sheet 41 as an example, it is U-shaped and can be formed by cutting a rectangular sheet.

[0095] It is understandable that the shapes of the first slot sheet, the second slot sheet 41, the third slot sheet 42, the fourth slot sheet 43 and the fifth slot sheet may be the same or different. Figure 7 The third slot piece 42 and the fourth slot piece 43 are both V-shaped, and the fifth slot piece is quasi-U-shaped. They are not listed here one by one.

[0096] In some embodiments, the material of the first slot sheet is insulating heat-resistant paper with a heat resistance grade greater than or equal to F; and / or, the material of the second slot sheet 41 is insulating heat-resistant paper with a heat resistance grade greater than or equal to F; and / or, the material of the third slot sheet 42 is insulating heat-resistant paper with a heat resistance grade greater than or equal to F; and / or, the material of the fourth slot sheet 43 is insulating heat-resistant paper with a heat resistance grade greater than or equal to F; and / or, the material of the fifth slot sheet is insulating heat-resistant paper with a heat resistance grade greater than or equal to F.

[0097] The above-mentioned insulating heat-resistant paper greater than or equal to Class F refers to insulating heat-resistant paper with a heat resistance grade of Class F or higher than Class F, and the temperature range corresponding to the heat resistance grade of Class F is 155°~180°.

[0098] Exemplarily, the materials of the first slot sheet, the second slot sheet 41, the third slot sheet 42, the fourth slot sheet 43 and the fifth slot sheet are all selected as insulating heat-resistant paper with a heat resistance grade greater than or equal to Class F, and the first slot sheet, the second slot sheet 41, the third slot sheet 42, the fourth slot sheet 43 and the fifth slot sheet can be a single insulating heat-resistant paper or a plurality of insulating heat-resistant papers stacked together. The use of insulating heat-resistant paper with a heat resistance grade greater than or equal to Class F to make the above slot sheets can make the slot sheets have higher high temperature resistance, maintain good insulation performance during the operation of the transformer, and avoid dangerous faults such as electrical breakdown and short circuit.

[0099] Exemplarily, the above-mentioned insulating heat-resistant paper is DMD (Dacron-Mylar-Dacron, a polyester film polyester fiber non-woven fabric composite material) insulating paper.

[0100] For example, the thickness of the insulating heat-resistant paper used for the first slot sheet, the second slot sheet 41, the third slot sheet 42, the fourth slot sheet 43 and the fifth slot sheet is 0.5 mm. In other embodiments, insulating heat-resistant paper of other thicknesses may also be used.

[0101] In some embodiments, there is a gap between the inner wall of the slot 40 of the first slot and the first temperature measuring member 51, and the gap is filled with an insulating medium. By filling the insulating medium, the stability of the first temperature measuring member 51 in the first slot can be effectively improved. And / or, there is a gap between the inner wall of the slot 40 of the second slot 41 and the second temperature measuring member 52, and the gap is filled with an insulating medium. By filling the insulating medium, the stability of the second temperature measuring member 52 in the second slot 41 can be effectively improved. And / or, there is a gap between the inner wall of the slot 40 of the third slot 42 and the third temperature measuring member 53, and the gap is filled with an insulating medium. By filling the insulating medium, the stability of the third temperature measuring member 53 in the third slot 42 can be effectively improved. And / or, there is a gap between the inner wall of the slot 40 of the fourth slot 43 and the fourth temperature measuring member 54, and the gap is filled with an insulating medium. By filling the insulating medium, the stability of the fourth temperature measuring member 54 in the fourth slot 43 can be effectively improved. And / or, there is a gap between the inner wall of the slot 40 of the fifth slot and the fifth temperature measuring component, and the gap is filled with an insulating medium. By filling the insulating medium, the stability of the fifth temperature measuring component in the fifth slot can be effectively improved.

[0102] Exemplarily, the insulating medium is insulating crepe paper, which has high softness and insulation strength, is convenient for filling the gap between the card slot 40 and the temperature measuring component, and will not damage the relatively fragile temperature measuring component.

[0103] See also Figure 6 and Fig. 9 The high-voltage winding 1 includes a high-voltage winding 12, which is wound in a layered arrangement. That is, the high-voltage winding 12 is spirally wound multiple times to form a first winding structure 11. After the high-voltage winding 12 forms a layer of the first winding structure 11, the next layer of the first winding structure 11 is continuously wound until the winding is completed. The entire high-voltage winding 1 is wound by a high-voltage winding 12 to form a multi-layer first winding structure 11.

[0104] Specifically, the high-voltage winding 12 includes a copper wire and a first insulating heat-resistant layer covering the copper wire. That is, after the first insulating heat-resistant layer covers the copper wire to form the high-voltage winding 12, the high-voltage winding 1 is wound.

[0105] The conductivity of copper wire meets the requirement of 95% to 103.5%, which can effectively reduce the temperature rise of transformer hot spot loss. It can ensure the stable operation of transformer under long-term 100% to 110% overload conditions, meet the daily overload operation of power grid, and has reliable safety performance.

[0106] The heat resistance grade of the first insulating heat-resistant layer is greater than or equal to Class F, and can be Class F or higher than Class F, which can improve the insulation and heat resistance performance of the entire high-voltage winding 1, and avoid electrical breakdown, short circuit and other phenomena due to excessive temperature rise. Exemplarily, the first insulating heat-resistant layer is DMD (Dacron-Mylar-Dacron, a polyester film polyester fiber non-woven fabric composite material) insulating heat-resistant paper, which has good insulation and heat resistance, and is easy to wrap around the copper wire. Optionally, insulating heat-resistant paper with a thickness of 0.3 mm is selected as the first insulating heat-resistant layer, so that the volume of the high-voltage winding 1 is not too large while ensuring the insulation and heat resistance performance.

[0107] In the high-voltage winding 1 of some embodiments, at least two layers of second insulating heat-resistant layers are provided on the side of the innermost first winding structure 11 facing the low-voltage winding 2; and at least two layers of third insulating heat-resistant layers are provided on the side of the outermost first winding structure 11 facing away from the low-voltage winding 2. Among them, the innermost first winding structure 11 is a first winding structure 11 in the first target layer that is closest to the low-voltage winding 2. The outermost first winding structure 11 is a first winding structure 11 in the second target layer that is farthest from the low-voltage winding 2. The above-mentioned two layers refer to two layers and more than two layers. Furthermore, one or more first intermediate insulating heat-resistant layers are placed between two adjacent layers of the first winding structure 11 of the high-voltage winding 1. The heat resistance grades of the above-mentioned second insulating heat-resistant layer, the third insulating heat-resistant layer and the first intermediate insulating heat-resistant layer are all greater than or equal to Class F. By arranging at least two layers of second insulating heat-resistant layers on the innermost layer of the high-voltage winding 1 facing the low-voltage winding 2, arranging at least two layers of third insulating heat-resistant layers on the outermost layer facing away from the low-voltage winding 2, and sandwiching a first intermediate insulating heat-resistant layer inside, the insulating and heat-resistant performance of the high-voltage winding 1 itself can be improved, the occurrence of melting through can be avoided, and the insulation between the high-voltage winding 1 and the low-voltage winding 2 can be improved.

[0108] The second insulating heat-resistant layer, the third insulating heat-resistant layer and the first intermediate insulating heat-resistant layer are all insulating heat-resistant paper, specifically DMD insulating paper. Exemplarily, the thickness of the insulating heat-resistant paper used for the second insulating heat-resistant layer, the third insulating heat-resistant layer and the first intermediate insulating heat-resistant layer is 0.5 mm, and insulating heat-resistant paper of other thicknesses may also be selected in other embodiments.

[0109] In this embodiment, see Fig.10 The low voltage winding 2 is formed by directly winding T2 copper foil, and a single layer of copper foil is a layer of the second winding structure 21.

[0110] In the low-voltage winding 2 of some embodiments, at least two fourth insulating heat-resistant layers are provided on the side of the innermost second winding structure 21 facing the core 3; and at least two fifth insulating heat-resistant layers are provided on the side of the outermost second winding structure 21 facing away from the core 3. Among them, the innermost second winding structure 21 is a second winding structure 21 closest to the core 3 in the third target layer. The outermost second winding structure 21 is a second winding structure 21 closest to the high-voltage winding 1 in the fourth target layer. The above-mentioned two layers refer to two layers and more than two layers. Furthermore, one or more second intermediate insulating heat-resistant layers are provided between two adjacent layers of the second winding structure 21 of the low-voltage winding 2. The heat resistance grades of the above-mentioned fourth insulating heat-resistant layer, fifth insulating heat-resistant layer and second intermediate insulating heat-resistant layer are all greater than or equal to Class F. By arranging at least two fourth insulating heat-resistant layers on the innermost layer of the low-voltage winding 2 facing the iron core 3, arranging at least two fifth insulating heat-resistant layers on the outermost layer facing away from the iron core 3, and sandwiching a second intermediate insulating heat-resistant layer inside, the insulation and heat-resistant performance of the low-voltage winding 2 itself can be improved, the occurrence of melt-through can be avoided, and the insulation between the low-voltage winding 2 and the high-voltage winding 1, and between the low-voltage winding 2 and the iron core 3 can be improved.

[0111] Exemplarily, three layers of the fourth insulating heat-resistant layer are arranged on the innermost side of the low-voltage winding 2, three layers of the fifth insulating heat-resistant layer are arranged on the outermost side of the low-voltage winding 2, and two layers of the second intermediate insulating heat-resistant layer are arranged between two adjacent layers of the second winding structure 21. In other embodiments, the number of the fourth insulating heat-resistant layer, the fifth insulating heat-resistant layer and the second intermediate insulating heat-resistant layer can be set as required.

[0112] The fourth insulating heat-resistant layer, the fifth insulating heat-resistant layer and the second intermediate insulating heat-resistant layer are all insulating heat-resistant paper, specifically DMD insulating paper. Exemplarily, the thickness of the insulating heat-resistant paper used for the fourth insulating heat-resistant layer, the fifth insulating heat-resistant layer and the second intermediate insulating heat-resistant layer is 0.08 mm, and insulating heat-resistant paper of other thicknesses may also be selected in other embodiments.

[0113] The oil tank 20 is filled with insulating oil, and the iron core 3, the high-voltage winding 1, and the low-voltage winding 2 are immersed in the insulating oil, which plays the role of insulation, heat insulation, fire prevention, etc. For example, FR3 natural ester insulating oil is selected as the cooling medium to be filled in the oil tank 20, which not only has the advantages of being degradable, environmentally friendly, and not polluting the soil and natural water system, but also will not cause irreversible damage to the environment even if it leaks, and can improve the insulation and heat resistance level of the transformer. Even under the extreme working conditions of the transformer (leakage or deflagration), it will not cause a fire that is difficult to extinguish, reducing the impact on personal safety and the safe operation of surrounding equipment.

[0114] See also Fig.11A receiving gap 8 is provided between the high voltage winding 1 and the low voltage winding 2, and the receiving gap 8 is an insulating and heat-resistant airway between the high voltage winding 1 and the low voltage winding 2. A support bar 50 is provided in the receiving gap 8. Specifically, a plurality of support bars 50 are provided at intervals along the outer periphery of the low voltage winding 2. The plurality of support bars 50 are sandwiched between the high voltage winding 1 and the low voltage winding 2. The insulating oil can pass through the gaps between adjacent support bars 50, further improving the insulation and heat resistance between the high voltage winding 1 and the low voltage winding 2, and improving safety.

[0115] See also Figure 6 and Fig.10 , the innermost second winding structure 21 is connected to the first lead 22, and the outermost second winding structure 21 is connected to the second lead 23. One of the first lead 22 and the second lead 23 is used for the incoming line, and the other is used for the outgoing line, so as to connect the low-voltage winding 2 to the corresponding loop. For the low-voltage winding 2, the third slot 42 and the third temperature measuring component 53 are sandwiched between the first lead 22 and the iron core 3; the fourth slot 43 and the fourth temperature measuring component 54 are sandwiched between the second lead 23 and the support bar 50. After the high-voltage winding 1, the low-voltage winding 2 and the iron core 3 are installed, the third slot 42 and the third temperature measuring component 53 are inserted between the first lead 22 and the iron core 3, and the fourth slot 43 and the fourth temperature measuring component 54 are inserted between the second lead 23 and the support bar 50, so that the positions of the third temperature measuring component 53 and the fourth temperature measuring component 54 can be fixed without the need for other fixing methods, which is convenient to operate.

[0116] Moreover, both sides of the third slot 42 and both sides of the fourth slot 43 can withstand the clamping force, preventing the clamping force from acting on the third temperature measuring component 53 and the fourth temperature measuring component 54, thereby avoiding damage to the third temperature measuring component 53 and the fourth temperature measuring component 54.

[0117] For the high-voltage winding 1, the first slot and the first temperature measuring component 51 are sandwiched between the support bar 50 and the innermost first winding structure 11; the second slot 41 and the second temperature measuring component 52 are sandwiched between two adjacent layers of the first winding structure 11. After the high-voltage winding 1, the low-voltage winding 2 and the iron core 3 are installed, the first slot and the first temperature measuring component 51 are inserted between the support bar 50 and the innermost first winding structure 11, and the second slot 41 and the second temperature measuring component 52 are inserted between the two adjacent layers of the outermost S layer of the first winding structure 11 (i.e., the two adjacent layers in the second target layer), without the need for other fixing methods.

[0118] Moreover, both sides of the first slot and both sides of the second slot 41 can withstand the clamping force, preventing the clamping force from acting on the first temperature measuring component 51 and the second temperature measuring component 52, thereby avoiding damage to the first temperature measuring component 51 and the second temperature measuring component 52.

[0119] In other embodiments, the second slot piece 41 and the second temperature measuring member 52 can also be fixed on the outer side of the outermost first winding structure 11, and at this time, an adhesive bonding method can be used for fixing.

[0120] As Fig.12 , Fig.13 and Fig.14 shown, the following is a schematic structural view of the iron core 3 provided by this embodiment. The iron core 3 includes an upper yoke 31, a lower yoke 32, side columns 33 and a core column 34. The upper yoke 31 and the lower yoke 32 are arranged at intervals, there are two side columns 33 arranged at intervals, both ends of the side columns 33 are respectively connected to the upper yoke 31 and the lower yoke 32, the core column 34 is connected to the middle parts of the upper yoke 31 and the lower yoke 32, and the upper yoke 31, the lower yoke 32, the core column 34 and the two side columns 33 are connected to form an iron core 3 in the shape of a Chinese character 'Ri'. Combining Figure 2 , there are three groups of both the high-voltage winding 1 and the low-voltage winding 2, and one group of low-voltage winding 2 and high-voltage winding 1 are sleeved on both the core column 34 and the two side columns 33.

[0121] The upper yoke 31, the lower yoke 32, the side columns 33 and the core column 34 all include a plurality of single-stage iron chip groups 30 stacked on top of each other. Each single-stage iron chip group 30 includes a plurality of iron core lamination units stacked on top of each other. Each iron core lamination unit includes a plurality of iron chips stacked on top of each other. Exemplarily, each iron core lamination unit is formed by pressing and stacking six iron chips.

[0122] As Fig.12 , Fig.13 and Fig.14 shown, both ends of each iron chip are processed with a 45° chamfer, which is convenient for lapping between the upper yoke 31, the lower yoke 32 and the side columns 33, and the lapping area is large, which can improve the stability after connection. Moreover, V-shaped lapping grooves 311 are opened at the middle positions of the upper yoke 31 and the lower yoke 32, and two 45° chamfers are cut at both ends of the middle core column 34, so that V-shaped structures are formed at both ends of the core column 34 to be engaged with the V-shaped lapping grooves 311 on the upper yoke 31 and the lower yoke 32.

[0123] The single-stage iron chip groups 30 adopt a stepped lamination method. Referring to Fig.13 and Fig.14 , the 45-degree chamfered parts of two adjacent single-stage iron chip groups 30 are distributed in a staggered manner, so that the splicing surfaces at both ends of the upper yoke 31, the splicing surfaces at both ends of the lower yoke 32, the splicing surfaces at both ends of the side columns 33, and the splicing surfaces at both ends of the core column 34 are all uneven splicing surfaces. Such a setting can improve the lapping strength between the upper yoke 31, the lower yoke 32, the side columns 33 and the core column 34, improve the stability of the entire iron core 3, and at the same time can improve the magnetic permeability of the entire iron core 3. Exemplarily, the staggered distance between two adjacent single-stage iron chip groups 30 is 5 mm to 10 mm.

[0124] The upper yoke 31, the lower yoke 32, the core column 34 and the two side columns 33 can be placed flat on a workbench for lamination. Epoxy resin AB glue is applied between the iron sheets, at the joints between the upper and lower yokes and the side columns 33, and at the joints between the upper and lower yokes and the core column 34 for curing. After curing, the iron core 3 can be erected.

[0125] See also Figure 2 The transformer also includes two clamping assemblies 6 disposed at both ends of the iron core 3. The high-voltage winding 1 and the low-voltage winding 2 are both located between the two clamping assemblies 6, and there is a gap between the two clamping assemblies 6. The two clamping assemblies 6 are used to clamp multiple iron core sheets of the iron core 3, so that the iron core sheets inside the iron core 3 are tight and stable. The fifth slot and the fifth temperature measuring component are clamped between the clamping assembly 6 and the iron core 3. After the clamping assembly 6 is installed, the fifth slot and the fifth temperature measuring component are inserted into the gap between the clamping assembly 6 and the surface of the iron core 3. There is no need to fix them in other ways, which is easy to operate. Moreover, the fifth slot can withstand the clamping force on both sides to prevent the clamping force from acting on the fifth temperature measuring component and causing damage to the fifth temperature measuring component.

[0126] See also Figure 1 and Figure 2 An insulating support block 7 is sandwiched between the high-voltage winding 1 and the low-voltage winding 2 and the corresponding clamping assembly 6, and the heat resistance grade of the insulating support block 7 is greater than or equal to Class F. The insulating support block 7 with a heat resistance grade greater than or equal to Class F not only supports the high-voltage winding 1 and the low-voltage winding 2, so that the positions of the high-voltage winding 1 and the low-voltage winding 2 are stable and do not shake, but also effectively improves the heat resistance and insulation performance of the transformer.

[0127] In the transformer provided in this embodiment, insulating heat-resistant paper with a heat resistance grade greater than or equal to F is arranged in the high-voltage winding 1 and the low-voltage winding 2, and the insulating support block 7 with a heat resistance grade greater than or equal to F and the natural ester insulating oil inside the oil tank 20 are matched, so that the entire transformer has high high temperature resistance and insulation performance, and the short-term overload capacity of the transformer is improved, which can meet the stable operation under short-term (2h-6h) 110%~120% load conditions.

[0128] Exemplarily, the insulating support block 7 is made of a wooden material with a heat resistance grade greater than or equal to F grade.

[0129] In this embodiment, the material of the iron core sheet is magnetic silicon steel, which has excellent magnetic conductivity, can generate a large magnetic induction intensity, and has low hysteresis loss, which can increase the capacity of the transformer. The material of the clamping component 6 is non-magnetic steel, which can reduce the eddy current loss generated by the clamping component 6, thereby reducing the heat on the clamping component 6 and reducing the hot spot position. Exemplarily, the clamping component 6 is made of 20Mn23AlV non-magnetic steel.

[0130] See also Figure 2 and Fig.15The two clamping assemblies 6 each include a first clamp 61 and a second clamp 62 that are spaced apart. The first clamp 61 and the second clamp 62 each include a first rod body 611 and two second rod bodies 612. The two second rod bodies 612 are connected to one side of the first rod body 611 so that the first clamp 61 and the second clamp 62 each form a C-shaped clamp structure. The two C-shaped clamp structures are arranged opposite to each other to clamp the two sides of the iron core 3.

[0131] Reference Figure 2 The upper clamping assembly 6 is used to clamp the upper end of the iron core 3. The clamping assembly 6 also includes two fixing beams 63. Both ends of the first clamp 61 and the second clamp 62 are connected by a fixing beam 63, for example, by bolt connection and fixing, so that the first clamp 61 and the second clamp 62 clamp the iron core 3. Specifically, the fixing beam 63 is located above the first rod body 611 and the second rod body 612, and the insulating support block 7 is sandwiched between the second rod body 612 and the high and low voltage windings.

[0132] Furthermore, the fixing beam 63 is provided with a fixing hole 631 for connecting and fixing the fixing beam 63 to the inside of the fuel tank 20. For example, a bolt is passed through the fixing hole 631 and is threadedly connected to the fuel tank 20, thereby fixing the fixing beam 63 to the inside of the fuel tank 20. Figure 2 The entire structure is shown fixed inside the oil tank 20.

[0133] Reference Figure 2 In the orientation, in the clamping assembly 6 on the lower side, connecting holes 6111 are provided on the first rod body 611 of the first clamp 61 and the second rod body 612 of the second clamp 62. A long bolt is passed through the connecting holes 6111 on the two first rod bodies 611, and a nut is screwed on the end of the long bolt to clamp the first clamp 61 and the second clamp 62 to the lower end of the iron core 3.

[0134] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A transformer, characterized in that: The invention comprises a high-voltage winding (1), a low-voltage winding (2), and an iron core (3), wherein the high-voltage winding (1) is sleeved on the low-voltage winding (2), and the low-voltage winding (2) is sleeved on the iron core (3); the high-voltage winding (1) comprises a multi-layer first winding structure (11) arranged in sequence from the inside to the outside, and the low-voltage winding (2) comprises a multi-layer second winding structure (21) arranged in sequence from the inside to the outside; The transformer further comprises a first slot sheet having a slot (40); the first slot sheet is arranged at a preset position of a first target layer in the first winding structure (11), the first target layer being at least one layer of the M layers in the first winding structure (11) close to the low-voltage winding (2), and the slot (40) of the first slot sheet is engaged with a first temperature measuring component (51); and / or, The transformer further comprises a second slot sheet (41) having a slot (40); the second slot sheet (41) is arranged at a preset position of a second target layer in the first winding structure (11), the second target layer being at least one layer of N layers in the first winding structure (11) away from the low-voltage winding (2), and the slot (40) of the second slot sheet (41) is engaged with a second temperature measuring element (52); and / or, The transformer further comprises a third slot sheet (42) having a slot (40); the third slot sheet (42) is arranged at a preset position of a third target layer in the second winding structure (21), the third target layer being at least one layer of an R layer close to the iron core (3) in the second winding structure (21), and the slot (40) of the third slot sheet (42) is engaged with a third temperature measuring component (53); and / or, The transformer further comprises a fourth slot (43) having a slot (40); the fourth slot (43) is arranged at a preset position of a fourth target layer in the second winding structure (21), the fourth target layer being at least one layer of the S layers in the second winding structure (21) close to the high-voltage winding (1), and the slot (40) of the fourth slot (43) is engaged with a fourth temperature measuring element (54); and / or, The transformer further comprises a fifth slot plate having a slot (40); a fifth temperature measuring component is engaged with the surface of the iron core (3) through the slot (40) of the fifth slot plate; Among them, M, N, R, and S are all positive integers greater than or equal to 1 and less than or equal to 5.

2. The transformer according to claim 1, characterized in that: The high-voltage winding (1) comprises a high-voltage winding (12), wherein the high-voltage winding (12) is spirally wound multiple times to form the first winding structure (11); The high-voltage winding (12) comprises a copper wire and a first insulating heat-resistant layer coated on the outside of the copper wire, the electrical conductivity of the copper wire satisfies 95% to 103.5%, and the heat resistance grade of the first insulating heat-resistant layer is greater than or equal to Grade F.

3. The transformer according to claim 1, characterized in that: At least two second insulating and heat-resistant layers are arranged on the side of the innermost layer of the first winding structure (11) facing the low-voltage winding (2), and the innermost layer of the first winding structure (11) is the first winding structure (11) that is closest to the low-voltage winding (2) in the first target layer; and / or, at least two third insulating and heat-resistant layers are arranged on the side of the outermost layer of the first winding structure (11) facing away from the low-voltage winding (2), and the outermost layer of the first winding structure (11) is the first winding structure (11) that is farthest from the low-voltage winding (2) in the second target layer; and / or, At least two fourth insulating and heat-resistant layers are provided on the side of the innermost layer of the second winding structure (21) facing the iron core (3), and the innermost layer of the second winding structure (21) is the layer of the second winding structure (21) closest to the iron core (3) in the third target layer; and / or, At least two fifth insulating and heat-resistant layers are provided on the side of the outermost layer of the second winding structure (21) facing away from the iron core (3), and the outermost layer of the second winding structure (21) is the layer of the second winding structure (21) closest to the high-voltage winding (1) in the fourth target layer; and / or, The heat resistance grades of the second insulating heat-resistant layer, the third insulating heat-resistant layer, the fourth insulating heat-resistant layer and the fifth insulating heat-resistant layer are all greater than or equal to Grade F.

4. The transformer according to claim 1, characterized in that: The transformer further comprises two clamping assemblies (6) respectively arranged at two ends of the iron core (3), the high-voltage winding (1) and the low-voltage winding (2) are both located between the two clamping assemblies (6), the iron core (3) comprises a plurality of iron core sheets stacked one on another, and the clamping assemblies (6) are used to clamp the plurality of iron core sheets; An insulating support block (7) is sandwiched between the high-voltage winding (1) and the low-voltage winding (2) and the corresponding clamping assembly (6), and the heat resistance grade of the insulating support block (7) is greater than or equal to Grade F.

5. The transformer according to claim 4, characterized in that: The material of the core piece is magnetic silicon steel; and / or the material of the clamping component (6) is non-magnetic steel.

6. The transformer according to claim 4, characterized in that: The fifth slot and the fifth temperature measuring element are clamped between the clamping assembly (6) and the iron core (3).

7. The transformer according to claim 4, characterized in that: An accommodation gap (8) is provided between the high-voltage winding (1) and the low-voltage winding (2), and a support bar (50) is provided in the accommodation gap (8); a first lead wire (22) is connected to the innermost layer of the second winding structure (21), and a second lead wire (23) is connected to the outermost layer of the second winding structure (21); the innermost layer of the second winding structure (21) is a layer of the second winding structure (21) closest to the iron core (3) in the third target layer, and the outermost layer of the second winding structure (21) is a layer of the second winding structure (21) closest to the high-voltage winding (1) in the fourth target layer; The first slot is sandwiched between the support bar (50) and the innermost first winding structure (11), and the innermost first winding structure (11) is a first winding structure (11) in the first target layer that is closest to the low-voltage winding (2); and / or, The second slot sheet (41) is sandwiched between two adjacent layers of the first winding structure (11); and / or, The third slot (42) is sandwiched between the first lead (22) and the iron core (3); and / or, The fourth slot (43) is sandwiched between the second lead (23) and the support bar (50).

8. The transformer according to claim 1, characterized in that: The shape of the first groove piece is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or, The shape of the second groove piece (41) is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or, The shape of the third groove piece (42) is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or, The shape of the fourth groove piece (43) is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped; and / or, The shape of the fifth groove piece is U-shaped or quasi-U-shaped or V-shaped or quasi-V-shaped.

9. The transformer according to any one of claims 1 to 8, characterized in that: The material of the first slot sheet is insulating heat-resistant paper with a heat resistance grade greater than or equal to grade F; and / or, The material of the second slot sheet (41) is insulating heat-resistant paper with a heat resistance grade greater than or equal to grade F; and / or, The material of the third slot sheet (42) is insulating heat-resistant paper with a heat resistance grade greater than or equal to Grade F; and / or, The material of the fourth slot sheet (43) is insulating heat-resistant paper with a heat resistance grade greater than or equal to grade F; and / or, The material of the fifth slot sheet is insulating heat-resistant paper with a heat resistance grade greater than or equal to F grade.

10. The transformer according to any one of claims 1 to 8, characterized in that: An insulating medium is filled between the inner wall of the slot (40) of the first slot and the first temperature measuring element (51); and / or, An insulating medium is filled between the inner wall of the slot (40) of the second slot sheet (41) and the second temperature measuring element (52); and / or, An insulating medium is filled between the inner wall of the slot (40) of the third slot sheet (42) and the third temperature measuring element (53); and / or, An insulating medium is filled between the inner wall of the slot (40) of the fourth slot sheet (43) and the fourth temperature measuring element (54); and / or, An insulating medium is filled between the inner wall of the clamping groove (40) of the fifth slot and the fifth temperature measuring component.

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