Clamping structure of oil-immersed transformer
By adding side pressure plates and pressure beams to the clamping structure of oil-immersed transformers, the displacement problem of coils and cores during short circuits is solved, achieving stronger short-circuit resistance and transformer stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-03-27
AI Technical Summary
In conventional oil-immersed transformers, the coils and core are prone to displacement or deformation during short-circuit faults due to the clamping structure of the transformer body, resulting in insufficient short-circuit withstand capability.
Adding side pressure plates and pressure beams to the clamping structure of oil-immersed transformers, and fixing them to the connectors via bolt assemblies, enhances the stability of the coils and core, and resists axial and radial impact forces during short circuits.
It effectively improves the short-circuit withstand capability of oil-immersed transformers, prevents damage to the core and coils during short circuits, and enhances the robustness of the transformer body.
Smart Images
Figure CN224052963U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to transformer technical field, especially a kind of clamping structure of oil-immersed transformer. BACKGROUND
[0002] Oil-immersed transformer is a common power transformer, widely used in power system. It realizes insulation and cooling function by immersing coil and core in insulating oil. The body clamping structure of transformer is an important part of oil-immersed transformer, and its main function is to firmly fix the core and coil together to prevent displacement or deformation of the core and coil due to electromagnetic force or mechanical vibration during operation.
[0003] The conventional body clamping structure of oil-immersed transformer includes two upper and lower clamps, and then the two clamps are tightened by screw rod to fix the coil, core, upper and lower yoke pad together to form the whole body.
[0004] The conventional body clamping structure has the defect of insufficient short-circuit resistance of transformer. The short-circuit resistance of transformer refers to the ability of transformer to withstand and limit short-circuit current when short-circuit fault occurs. After the conventional body clamping structure of oil-immersed transformer is impacted by short-circuit force, the coil is axially displaced under the action of axial short-circuit force, which also acts on the core and clamp, resulting in axial displacement and damage of the core and clamp; under the action of amplitude short-circuit force, high-voltage coil is subjected to tension and low-voltage coil is subjected to pressure, resulting in deformation and damage of coil.
[0005] Therefore, the present inventors designed a clamping structure of oil-immersed transformer after years of production and design experience in this field and related fields, in order to solve the problems existing in the prior art. CONTENT OF UTILITY MODEL
[0006] The utility model aims to provide a kind of clamping structure of oil-immersed transformer, which can effectively improve the short-circuit resistance of oil-immersed transformer.
[0007] To achieve the above-mentioned purpose, the utility model provides a kind of clamping structure of oil-immersed transformer, wherein the oil-immersed transformer includes a core and a coil wound on the core, and the clamping structure includes an upper clamp, a lower clamp, a plurality of first tensioning members and two side pressure plates. The upper clamp and the lower clamp are located at the top end and the bottom end of the core respectively, and the upper clamp and the lower clamp are connected as a whole structure by a plurality of first tensioning members. Two side pressure plates are respectively arranged on opposite sides of the coil. The top end of each side pressure plate is detachably fixedly connected with the upper clamp, and the bottom end of each side pressure plate is detachably connected with the lower clamp.
[0008] The clamping structure of the oil-immersed transformer as described above, wherein the upper clamp comprises high-voltage side upper clamps and low-voltage side upper clamps arranged in parallel and at intervals, the high-voltage side upper clamps and the low-voltage side upper clamps are connected into an integral structure by upper tensioning members, the lower clamp comprises high-voltage side lower clamps and low-voltage side lower clamps arranged in parallel and at intervals, the high-voltage side lower clamps and the low-voltage side lower clamps are connected into an integral structure by lower tensioning members, both ends of the high-voltage side upper clamps, both ends of the low-voltage side upper clamps, both ends of the high-voltage side lower clamps and both ends of the low-voltage side lower clamps are respectively provided with connecting members protruding inwardly, and each connecting member is detachably connected with the side pressure plate by a bolt assembly.
[0009] The clamping structure of the oil-immersed transformer as described above, wherein the connecting member has a vertical portion and a horizontal portion perpendicular to each other, the vertical portion is arranged in parallel with the side pressure plate, and the bolt assembly comprises a connecting bolt and a locking nut, the connecting bolt penetrates the side pressure plate, the vertical portion and the locking nut in sequence and fixes and connects the side pressure plate and the vertical portion together.
[0010] The clamping structure of the oil-immersed transformer as described above, wherein an iron yoke insulating pad is arranged between the upper clamp and the iron core and between the lower clamp and the iron core, and the horizontal portion of each connecting member is in position and pressed on the iron yoke insulating pad.
[0011] The clamping structure of the oil-immersed transformer as described above, wherein the upper clamp and the lower clamp are fixedly connected with the iron yoke insulating pad by a plurality of pressing nail assemblies.
[0012] The clamping structure of the oil-immersed transformer as described above, wherein the pressing nail assembly comprises a threaded column and a fastening bolt, the threaded column is fixedly connected on the upper clamp or the lower clamp, the fastening bolt penetrates the threaded column and is threadedly connected with the threaded column, and the end of the fastening bolt protrudes from the threaded column and is inserted into the iron yoke insulating pad.
[0013] The clamping structure of the oil-immersed transformer as described above, wherein at least one pressing beam is further connected between the high-voltage side upper clamp and the low-voltage side upper clamp, one end of the pressing beam is detachably fixedly connected with the high-voltage side upper clamp, and the other end of the pressing beam is detachably fixedly connected with the low-voltage side upper clamp.
[0014] The clamping structure of the oil-immersed transformer as described above, wherein a pressing beam pad is arranged between the pressing beam and the high-voltage side upper clamp and between the pressing beam and the low-voltage side upper clamp.
[0015] The clamping structure of the oil-immersed transformer as described above, wherein a side pressure plate insulating pad is arranged between each side pressure plate and the coil.
[0016] The clamping structure of the oil-immersed transformer as described above, wherein a plurality of feet are arranged on the lower clamp.
[0017] Compared with the prior art, the oil-immersed transformer clamping structure has the following characteristics and advantages:
[0018] The oil-immersed transformer clamping structure has a side pressing plate added on both sides of the coil, so that the body of the oil-immersed transformer is more firm, and the side pressing plate can effectively resist the amplitude impact force when the coil is short-circuited, thereby avoiding damage to the iron core, coil and other key components of the oil-immersed transformer. BRIEF DESCRIPTION OF DRAWINGS
[0019] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and scale sizes of the components in the drawings are only illustrative and are used to help understand the present application, and are not specific limitations on the shapes and scale sizes of the components. Those skilled in the art can select various possible shapes and scale sizes to implement the present application according to specific circumstances under the guidance of the present application.
[0020] Figure 1 A perspective view of the oil-immersed transformer according to the present application is shown in the figure;
[0021] Figure 2 A top view of the oil-immersed transformer according to the present application is shown in the figure;
[0022] Figure 3 A front view of the oil-immersed transformer according to the present application is shown in the figure;
[0023] Figure 4 A side view of the oil-immersed transformer according to the present application is shown in the figure;
[0024] Figure 5 A schematic view of the upper clamp according to the present application is shown in the figure;
[0025] Figure 6 A schematic view of the pressing pin assembly according to the present application is shown in the figure.
[0026] BRIEF DESCRIPTION OF DRAWINGS
[0027] 100, clamping structure; 10, upper clamp;
[0028] 11, high-voltage side upper clamp, 12, low-voltage side upper clamp;
[0029] 13, upper tensioning member; 14, pressing beam;
[0030] 15, pressing beam pad; 16, pressing beam insulating plate;
[0031] 20. Lower clamping component; 21. High-voltage side lower clamping component;
[0032] 22. Low-pressure side lower clamp; 23. Base foot;
[0033] 30. First tensioning element; 40. Side pressure plate;
[0034] 50. Connecting parts; 51. Vertical parts;
[0035] 52. Horizontal section; 60. Bolt assembly;
[0036] 61. Connecting bolts; 62. Locking nuts;
[0037] 70. Iron yoke insulating pad; 80. Pressing nail assembly;
[0038] 81. Threaded post; 82. Fastening bolt;
[0039] 83. Washers; 90. Side-pressure insulating pads;
[0040] 200. Oil-immersed transformer; 210. Iron core;
[0041] 220. Coil. Detailed Implementation
[0042] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.
[0043] Unless otherwise defined, the directions such as up, down, left, and right mentioned in this document refer to those shown in this utility model. Figure 1 The directions of up, down, left, and right are used as a reference, and will be explained here.
[0044] like Figures 1 to 4 As shown, this utility model proposes a clamping structure 100 for an oil-immersed transformer. The oil-immersed transformer 200 includes an iron core 210 and a coil 220 wound on the iron core 210. The clamping structure 100 includes an upper clamp 10, a lower clamp 20, a plurality of first tensioning members 30, and two side pressure plates 40. The upper clamp 10 and the lower clamp 20 are located at the top and bottom ends of the iron core 210, respectively, and the upper clamp 10 and the lower clamp 20 are connected as an integral structure by the plurality of first tensioning members 30. The two side pressure plates 40 are respectively provided on opposite sides of the coil 220. The top end of each side pressure plate 40 is detachably fixedly connected to the upper clamp 10, and the bottom end of each side pressure plate 40 is detachably connected to the lower clamp 20.
[0045] The clamping structure 100 of the oil-immersed transformer provided by the utility model, which is provided with the side pressing plates 40 on both sides of the coil 220, makes the body of the oil-immersed transformer 200 more firm, and the side pressing plates 40 can effectively resist the amplitude impact force when the coil 220 is short-circuited, thereby avoiding damage to the iron core 210, the coil 220 and other key components of the oil-immersed transformer 200.
[0046] In an optional embodiment of the utility model, the upper clamping piece 10 comprises high-voltage side upper clamping pieces 11 and low-voltage side upper clamping pieces 12 which are arranged in parallel and at intervals, the high-voltage side upper clamping pieces 11 and the low-voltage side upper clamping pieces 12 are connected into an integral structure through upper tensioning pieces 13, the lower clamping piece 20 comprises high-voltage side lower clamping pieces 21 and low-voltage side lower clamping pieces 22 which are arranged in parallel and at intervals, the high-voltage side lower clamping pieces 21 and the low-voltage side lower clamping pieces 22 are connected into an integral structure through lower tensioning pieces, the two ends of the high-voltage side upper clamping pieces 11, the two ends of the low-voltage side upper clamping pieces 12, the two ends of the high-voltage side lower clamping pieces 21 and the two ends of the low-voltage side lower clamping pieces 22 are respectively provided with connecting pieces 50 which protrude towards the inside, and each connecting piece 50 is detachably connected with the side pressing plate 40 through a bolt assembly 60.
[0047] In an optional example of the embodiment, the iron core 210 comprises an iron core column, an upper iron yoke and a lower iron yoke, the upper iron yoke is arranged at the top of the iron core column, and the lower iron yoke is arranged at the bottom of the iron core column; the high-voltage side upper clamping pieces 11 and the low-voltage side upper clamping pieces are clamped at the high-voltage side and the low-voltage side of the upper iron yoke respectively, and the high-voltage side lower clamping pieces 21 and the low-voltage side lower clamping pieces 22 are clamped at the high-voltage side and the low-voltage side of the lower iron yoke respectively; the coil 220 is wound on the iron core column.
[0048] In an optional example of the embodiment, the connecting piece 50 has a vertical part 51 and a horizontal part 52 which are perpendicular to each other, the vertical part 51 is arranged in parallel with the side pressing plate 40, the bolt assembly 60 comprises connecting bolts 61 and locking nuts 62, the connecting bolts 61 pass through the side pressing plate 40, the vertical part 51 and the locking nuts 62 in sequence and fix and connect the side pressing plate 40 and the vertical part 51 together.
[0049] In an optional example, the connecting piece 50 is a pressed angle steel which is welded on the inner side wall of the high-voltage side upper clamping piece 11, the inner side wall of the low-voltage side upper clamping piece 12, the inner side wall of the high-voltage side lower clamping piece 21 or the inner side wall of the low-voltage side lower clamping piece 22.
[0050] In an optional example, an iron yoke insulating pad 70 is arranged between the upper clamp 10 and the core 210 (upper iron yoke) and between the lower clamp 20 and the core 210 (lower iron yoke) respectively, and the horizontal part 52 of each connecting piece 50 is pressed against the corresponding iron yoke insulating pad 70. The pressure of the upper clamp 10 can be transmitted to the coil 220 through the horizontal part 52 and the iron yoke insulating pad 70, thereby increasing the contact area of the pressure assembly and effectively resisting the axial impact force when the coil 220 is short-circuited.
[0051] In an optional embodiment, the upper clamp 10 and the lower clamp 20 are fixedly connected to the corresponding iron yoke insulating pad 70 through a plurality of pressing pin assemblies 80 respectively, so as to further increase the fixing effect of the upper clamp 10 and the lower clamp 20 on the iron yoke insulating pad 70.
[0052] In an optional example of the embodiment, the high-voltage side upper clamp 11 and the low-voltage side upper clamp 12 are fixedly connected to the corresponding iron yoke insulating pad 70 through a plurality of pressing pin assemblies 80 respectively. The pressure of the upper clamp 10 is further transmitted to the iron yoke insulating pad 70 through the plurality of pressing pin assemblies 80, and then to the surface of the coil 220, so as to resist the axial force when the coil 220 is short-circuited.
[0053] Further, as shown in Figure 5 、 Figure 6 , the pressing pin assembly 80 includes a threaded column 81 and a fastening bolt 82. The threaded column 81 is fixedly connected to the high-voltage side upper clamp 11 or the low-voltage side upper clamp 12, and the fastening bolt 82 penetrates the threaded column 81 and is threadedly connected with the threaded column 81. The end of the fastening bolt 82 protrudes from the threaded column 81 and is inserted into the iron yoke insulating pad 70.
[0054] Preferably, the high-voltage side upper clamp 11 and the low-voltage side lower clamp 12 are made of channel steel, and the threaded column 81 is made of round steel with a threaded hole drilled in the interior of the round steel. The threaded column 81 is flush with the lower end surface of the channel steel and is welded thereto, and the channel steel is provided with a circular hole. During assembly, the fastening bolt 82 penetrates the threaded hole and the circular hole, and the sharp end of the bottom of the fastening bolt 82 is screwed into the iron yoke insulating pad.
[0055] Further, the outer diameter of the nut of the fastening bolt 82 is slightly smaller than the outer diameter of the threaded column 81, so as to facilitate the installation of the fastening bolt 82 in the narrow space inside the channel steel. A washer 83 is arranged between the top of the threaded column 81 and the nut, so as to prevent the fastening bolt 82 from loosening.
[0056] In an optional example, the high-voltage side lower clamp 21 and the low-voltage side lower clamp 22 are also fixedly connected to the corresponding iron yoke insulating pad 70 through a plurality of pressing pin assemblies 80.
[0057] In an alternative embodiment, at least one pressing beam 14 is further connected between the high-voltage side upper clamp 11 and the low-voltage side upper clamp 12, one end of the pressing beam 14 is detachably fixedly connected with the high-voltage side upper clamp 11, and the other end of the pressing beam 14 is detachably fixedly connected with the low-voltage side upper clamp 12. When the coil 220 is subjected to an axial impact force, the axial impact force is transmitted to the upper yoke of the iron core 210 through the coil 220, which can cause the upper yoke to be deformed and damaged. By using the above structure, the pressing beam 14 can press the upper yoke to ensure that the upper yoke is flat and avoid deformation and damage of the upper yoke.
[0058] In an alternative example, the pressing beam 14 and the high-voltage side upper clamp 11 are provided with a pressing beam pad 15 and a pressing beam insulating plate 16, respectively.
[0059] In an alternative example, the pressing beam insulating plate 16 is made of paper and serves as an insulating layer between the pressing beam pad 15 and the iron core 210, and the pressing beam pad 15 is made of laminated wood and serves as an insulating layer and a support.
[0060] In an alternative example, two pressing beams 14 are connected between the high-voltage side upper clamp 11 and the low-voltage side upper clamp 12, and the two pressing beams 14 are arranged in parallel and spaced apart.
[0061] In an alternative embodiment, the high-voltage side lower clamp 21 and the low-voltage side lower clamp 22 of the lower clamp 20 are also connected with a pressing beam (not shown in the figure), and the specific structure is similar to that of the upper clamp 10, which will not be described here.
[0062] In an alternative embodiment of the present application, side pressing plate insulating pads 90 are arranged between the side pressing plates 49 and the coil 220.
[0063] In an alternative embodiment of the present application, a plurality of feet 24 are arranged on the lower clamp 20.
[0064] In an alternative example of the embodiment, the lower clamp 20 is provided with three feet 24.
[0065] In an alternative embodiment, the first tensioning member 30 includes a screw rod and two connecting nuts, the top end of the screw rod penetrates the upper clamp 10 and is threadedly connected with the connecting nut, the bottom end of the screw rod penetrates the lower clamp 20 and is threadedly connected with the other connecting nut, thereby tightening the upper clamp 10 and the lower clamp 20 together.
[0066] In an alternative example, the screw rod penetrates the two yoke insulating pads 70, and the yoke insulating pads 70 also serve as positioning members.
[0067] Further, the yoke insulating pads 70 are made of laminated wood.
[0068] In an alternative example, the structure of the upper tensioning member 13 and the lower tensioning member 23 is similar to that of the first tensioning member 30, and thus is not described herein.
[0069] The clamping structure 100 of the oil-immersed transformer provided by the utility model adds a pressing beam 14, a connecting piece 50 and a pressing nail assembly 80 on the upper clamp 10 and the lower clamp 20, so as to resist the axial impact force when the coil 220 is short-circuited, and make the coil 220 more firmly in the axial direction; the utility model also adds a side pressing plate 40 on both sides of the coil 220, and the side pressing plate 40 is fixed with the connecting piece 50 through a bolt assembly 60, so as to resist the amplitude impact force when the coil 220 is short-circuited.
[0070] The detailed explanation of each embodiment is only for the purpose of explaining the utility model, so as to better understand the utility model, but these descriptions cannot be explained as the limitation of the utility model for any reason, especially, each feature described in different embodiments can be combined with each other at will, so as to form other embodiments, except for the explicit opposite description, these features should be understood as being applicable to any one embodiment, and not limited to the described embodiments.
Claims
1. A clamping structure of an oil-immersed transformer, characterized by comprising: The oil-immersed transformer comprises a core and a coil wound on the core, the clamping structure comprises an upper clamp, a lower clamp, a plurality of first tensioning members and two side pressing plates, the upper clamp and the lower clamp are respectively located at the top end and the bottom end of the core, and the upper clamp and the lower clamp are connected as an integral structure by the plurality of first tensioning members, the two side pressing plates are respectively arranged at opposite sides of the coil, the top end of each side pressing plate is detachably fixedly connected with the upper clamp, and the bottom end of each side pressing plate is detachably connected with the lower clamp. The upper clamp comprises a high-voltage side upper clamp and a low-voltage side upper clamp arranged in parallel and spaced apart, the high-voltage side upper clamp and the low-voltage side upper clamp are connected as an integral structure by an upper tensioning member, the lower clamp comprises a high-voltage side lower clamp and a low-voltage side lower clamp arranged in parallel and spaced apart, the high-voltage side lower clamp and the low-voltage side lower clamp are connected as an integral structure by a lower tensioning member, and the two ends of the high-voltage side upper clamp, the two ends of the low-voltage side upper clamp, the two ends of the high-voltage side lower clamp and the two ends of the low-voltage side lower clamp are respectively provided with a connecting member protruding inwardly. The connecting member has a vertical portion and a horizontal portion perpendicular to each other, the vertical portion is arranged in parallel with the side pressing plate, the bolt assembly comprises a connecting bolt and a locking nut, the connecting bolt penetrates the side pressing plate, the vertical portion and the locking nut in sequence and fixes the side pressing plate and the vertical portion together. At least one pressing beam is further connected between the high-voltage side upper clamp and the low-voltage side upper clamp, one end of the pressing beam is detachably fixedly connected with the high-voltage side upper clamp, and the other end of the pressing beam is detachably fixedly connected with the low-voltage side upper clamp. Pressing beam spacers are respectively arranged between the pressing beam and the high-voltage side upper clamp and between the pressing beam and the low-voltage side upper clamp.
2. The clamping structure of an oil-immersed transformer according to claim 1, wherein Iron yoke insulating spacers are respectively arranged between the upper clamp and the core and between the lower clamp and the core, and the horizontal portion of each connecting member is in position and pressed on the iron yoke insulating spacer.
3. The clamping structure of an oil-immersed transformer according to claim 2, wherein The upper clamp and the lower clamp are fixedly connected with the iron yoke insulating spacers by a plurality of pressing nail assemblies.
4. The oil-immersed transformer clamping structure according to claim 3, wherein The pressing nail assembly comprises a threaded column and a fastening bolt, the threaded column is fixedly connected with the upper clamp or the lower clamp, the fastening bolt penetrates the threaded column and is threadedly connected with the threaded column, and the end of the fastening bolt protrudes from the threaded column and is inserted into the iron yoke insulating spacer.
5. The oil-immersed transformer clamping structure according to claim 1, wherein Side pressing plate insulating spacers are arranged between each side pressing plate and the coil.
6. The oil-immersed transformer clamping structure according to claim 1, wherein A plurality of bottom feet are arranged on the lower clamp.