Transformer lead equalizing tube fixing structure and transformer

Abstract

The utility model relates to transformer equipment field especially, it relates to a transformer lead equalizing tube fixing structure and transformer, including the elevated seat, the elevated seat inside is provided with a plurality of insulating support structure for providing support and clamping for equalizing tube, the insulating support structure includes the insulating support that connects with the elevated seat, the insulating support is connected with the insulating clamp, the insulating clamp is set up in the outside of equalizing tube, and is provided with a plurality of insulating layers between equalizing tube, a plurality of insulating struts are arranged between adjacent insulating layers. This structure can reliably fix equalizing tube in the predetermined position in the elevated seat, has the characteristics such as simple structure, compactness is good, stability is good, security is high, solves the equalizing tube fixing security and the reliability problem of poor of prior art.

Description

Technical Field

[0001] This utility model relates to the field of transformer equipment, specifically a transformer lead equalizing tube fixing structure and a transformer. Background Technology

[0002] Since the mid-20th century, with the rapid growth of global energy demand and the increasingly prominent uneven distribution of energy resources and consumption areas, long-distance, large-capacity power transmission has become a key means to solve the contradiction between energy supply and demand. Ultra-high voltage direct current (UHVDC) transmission technology, with its significant advantages such as large transmission capacity, long transmission distance, narrow transmission corridors, and flexible control, has gradually become the mainstream technology in the global power transmission field. In the 1980s, China had almost no experience in the design and manufacturing of converter transformers and the production of key materials, and related technologies were monopolized by a few foreign companies. After years of effort, my country has made significant progress in the field of UHVDC transmission technology. In 2010, the world's first ±800 kV Xiangjiaba-Shanghai UHVDC demonstration project was successfully put into operation, marking a significant milestone in the development of my country's UHVDC transmission technology. The commissioning of this project signifies that my country, based on the digestion and absorption of imported technologies, has achieved independent innovation and successfully completed the development of the world's first ±800 kV converter transformer, significantly improving the localization rate. Subsequently, a relatively complete ultra-high voltage direct current transmission network was gradually formed, which not only met the domestic demand for large-scale, long-distance energy transmission, but also provided experience for the construction of the global energy internet.

[0003] However, ultra-high voltage direct current (UHVDC) transmission technology still has shortcomings in some key areas and has not yet achieved complete self-sufficiency and control. Particularly in the manufacturing of core components of converter transformers, some key technologies remain dependent on foreign suppliers. The equalizing pipe on the grid valve side lead, as a crucial component of the converter transformer, directly impacts the transformer's operational safety and reliability through its design and manufacturing level. It primarily serves to equalize the electric field distribution around the leads, preventing insulation breakdown caused by localized electric field concentration, thereby ensuring the safe and stable operation of the transformer.

[0004] Most existing equalizing tube clamping structures adopt a planar arrangement, which has obvious drawbacks in space utilization. Due to the limited internal space of the converter transformer, the space distance between the equalizing tube and other components is small. The planar arrangement of the clamping structure can easily lead to spatial interference between the equalizing tube and other components, increasing the overall height of the riser and reducing space utilization.

[0005] Furthermore, in the existing equalizing pipe fixing structure of the valve side lead, the welded threaded seat inside the riser is a critical connecting component, and its welding quality directly affects the fixing effect of the equalizing pipe and the operational safety of the transformer. However, in actual production, the welding quality of the welded threaded seat is often difficult to guarantee effectively. Due to limitations in welding technology and differences in operator skill levels, problems such as uneven grinding or sharp burrs are prone to occur in the weld. These problems cause the electric field to concentrate at the weld and sharp burrs, thus triggering discharge phenomena. Once discharge occurs, it will not only damage the insulation performance of the equalizing pipe and the riser, but may also cause local overheating, leading to equipment failure, or even serious accidents such as fires.

[0006] Creepage distance in insulation refers to the shortest path measured along the insulation surface between two conductive parts or between a conductive part and the equipment interface. In existing valve-side lead-equalizing pipe insulation structures, the creepage distance is often insufficient, posing a serious threat to transformer operational safety. Furthermore, converter transformers are subject to environmental factors during long-term operation. When contaminants adhere to the insulation surface, in humid environments, these contaminants can form conductive paths, reducing the surface resistance. If the creepage distance is insufficient, the electric field strength will exceed the insulation material's tolerance, leading to insulation breakdown. In addition, insufficient creepage distance can also trigger partial discharge, accelerating the aging of the insulation material and further reducing insulation performance.

[0007] In summary, while existing technologies for designing and manufacturing equalizing tubes for the valve side have achieved some success, key issues remain, including welding quality of the internal welded threaded seat of the riser, spatial interference in the equalizing tube clamping structure, and insufficient creepage distance in the insulation structure. These problems severely impact the operational safety and reliability of converter transformers and hinder the further development of ultra-high voltage direct current transmission technology. Therefore, it is urgent to develop a safe and reliable equalizing tube fixing structure to solve the problems existing in current technologies. Utility Model Content

[0008] To address the issues of poor safety and reliability in the fixing of equalizing tubes in existing technologies, this utility model provides a transformer lead equalizing tube fixing structure and a transformer.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a transformer lead equalizing tube fixing structure, including a riser base, wherein the riser base is provided with several insulating support structures for providing support and clamping for the equalizing tube; The insulating support structure includes an insulating bracket connected to the riser, the insulating bracket being connected to an insulating clamp, the insulating clamp being sleeved on the outside of the equalizing pipe, and several insulating layers being provided between the clamp and the equalizing pipe; several insulating support strips are provided between adjacent insulating layers.

[0010] Optionally, a connecting nut is provided on the outside of the housing of the lifting seat, and the insulating bracket is fixedly connected to the connecting nut.

[0011] Optionally, the insulating bracket and the insulating clamp are connected by an insulating screw.

[0012] Optionally, an insulating step is fixedly connected circumferentially to the outside of the equalizing pipe, and the insulating clamp is engaged with the insulating step.

[0013] Optionally, the included angle between adjacent insulating support bars is 45°.

[0014] Optionally, the insulating support strip is bonded to the insulating layer with casein adhesive.

[0015] Optionally, the insulating support structure is configured as two layers, and the included angle between the two insulating support structures in space is 30°.

[0016] Optionally, the insulating layer is an insulating paper tube.

[0017] Optionally, the lengths of the insulating struts between adjacent insulating layers are the same.

[0018] A transformer, comprising the aforementioned transformer lead equalizing tube fixing structure.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a transformer lead equalizing pipe fixing structure. This structure, through the arrangement of a riser base, insulating bracket, insulating clamps, and insulating support strips, forms a stable fixing structure that reliably fixes the equalizing pipe in a predetermined position within the riser base. The connection method between the insulating bracket and the riser base ensures a stable connection between the entire fixing structure and the transformer body. The insulating clamps hold the equalizing pipe from multiple directions, preventing displacement or loosening due to vibration, electromagnetic forces, or other factors during transformer operation, thus ensuring the safe and stable operation of the transformer. The overall structure is compact, minimizing the space occupied by the fixing structure while ensuring insulation performance and fixing effect. The rational layout of the insulating bracket and insulating clamps allows the equalizing pipe to be tightly installed within the riser base without excessively increasing the overall height and volume of the riser base, improving the space utilization rate of the transformer. Furthermore, several layers of insulation are set between the insulating clamps and the equalizing pipe. This multi-layer insulation structure greatly improves the overall insulation performance. Compared with the traditional single-layer insulation structure, multi-layer insulation can better disperse the electric field intensity, avoiding insulation breakdown caused by local electric field concentration. Meanwhile, each insulation layer can bear a portion of the electric field stress. Even if a layer has a slight insulation defect or aging, the other layers can still provide reliable insulation protection. This significantly improves the insulation reliability and stability of the transformer lead grading tube fixing structure, reducing the risk of transformer accidents caused by insulation faults. Several insulating support strips are installed between adjacent insulation layers. These strips not only support and fix the insulation layers but also optimize the electric field distribution. They can change the spatial structure between insulation layers, making the electric field distribution more uniform within the insulation layers, increasing the creepage distance, and improving safety and stability.

[0020] The outer shell of the riser is provided with a connecting nut, and the insulating bracket is fixedly connected to the connecting nut. This provides a clear fixing point for the installation of the insulating bracket, while eliminating the risk of internal discharge caused by weld seams or sharp corner burrs of the threaded seat.

[0021] The insulating bracket and the insulating clamp are connected by an insulating screw. The insulating screw itself has good insulation properties. By using an insulating screw to connect the insulating bracket and the insulating clamp, the entire connection area is wrapped with insulating material, avoiding the risk of electrical conductivity that may be caused by metal connectors.

[0022] An insulating step is fixedly connected to the outside of the equalizing pipe in a circumferential direction. The insulating clamp and the insulating step are engaged in a locking mechanism. The locking structure can ensure that the insulating clamp and the insulating step are tightly fitted and will not loosen or shift, thus providing a continuous and reliable fixing effect for the equalizing pipe.

[0023] The included angle between adjacent insulating support bars is 45° to optimize force transmission and support distribution and avoid local stress concentration.

[0024] The insulating support strip is bonded to the insulating layer with casein adhesive to ensure high-strength bonding and good electrical insulation performance.

[0025] The insulating support structure is configured in two layers, with the included angle between the two insulating support structures being 30°, in order to reduce mutual interference between the support structures and maximize the use of space.

[0026] The insulation layer is an insulating paper tube, primarily made of cellulose, which has a high resistivity. This effectively prevents current leakage and conduction, ensuring safe equipment operation and reducing the risk of electrical faults such as short circuits and breakdowns. The manufacturing process of the insulating paper tube is relatively mature, with a complete production process and quality control system, resulting in low operating costs. The insulation support strips between adjacent insulation layers are of the same length, and a stable insulation gap can prevent an increase in the risk of insulation breakdown due to gap changes.

[0027] This utility model also provides a transformer, including the above-mentioned transformer lead equalizing tube fixing structure. This transformer has better safety and structural stability, simple structure, low modification cost, and is easy to install and maintain. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a transformer lead equalizing tube fixing structure according to the present invention.

[0029] Figure 2 for Figure 1 Cross-sectional view along the AA direction.

[0030] Figure 3 for Figure 1 Cross-sectional view along the BB direction.

[0031] Figure 4 This is a partial cross-sectional view of the insulating support structure of this utility model.

[0032] Among them, 1-Equalizing ball, 2-Equalizing pipe, 3-Lifting seat, 4-Insulating bracket, 5-Insulating clamp, 6-Insulating support bar, 7-Connecting nut, 8-Insulating step, 9-Insulating layer. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] The present invention will be further described in detail below with reference to specific embodiments. The description is for explanation and not limitation of the present invention.

[0040] Example 1 See Figure 1This utility model discloses a transformer lead equalizing tube fixing structure. The transformer lead equalizing tube includes an equalizing ball 1 and an equalizing tube 2. The equalizing ball 1 and the equalizing tube 2 are connected as a whole by blackened steel bolts inside the transformer. The transformer lead equalizing tube fixing structure includes a lifting seat 3. The equalizing ball 1 and the equalizing tube 2 are both disposed inside the lifting seat 3. The lifting seat 3 is provided with several insulating support structures to provide support and clamping for the equalizing tube 2. See Figures 2 to 4 The outer wall of the riser 3 has a circular hole and a connecting nut 7 is welded thereon; the insulating support structure includes an insulating bracket 4 that is connected to the riser 3 through the connecting nut 7. The insulating bracket 4 is pried to an insulating clamp 5 by an insulating screw. The insulating clamp 5 is sleeved on the outside of the equalizing pipe 2, and several insulating layers 9 are provided between the clamp 5 and the equalizing pipe 2. Optionally, the insulating layer 9 is an insulating paper tube; several insulating support strips 6 are provided between adjacent insulating layers; an insulating step 8 is fixedly connected to the outside of the equalizing pipe 2 in a circumferential direction, and the insulating clamp 5 is engaged with the insulating step 8.

[0041] This utility model provides a transformer lead equalizing pipe fixing structure. This structure, through the arrangement of a riser 3, insulating bracket 4, insulating clamp 5, and insulating support strip 6, forms a stable fixing structure that reliably fixes the equalizing pipe in a predetermined position within the riser 3. The connection between the insulating bracket 4 and the riser 3 ensures a stable connection between the entire fixing structure and the transformer body. The insulating clamp 5 clamps the equalizing pipe from multiple directions, preventing displacement or loosening of the equalizing pipe 2 due to vibration, electromagnetic forces, or other factors during transformer operation, thus ensuring the safe and stable operation of the transformer. The overall structure is compact, minimizing the space occupied by the fixing structure while ensuring insulation performance and fixing effect. The reasonable layout of the insulating bracket 4 and insulating clamp 5 allows the equalizing pipe 2 to be tightly installed within the riser 3 without excessively increasing the overall height and volume of the riser 3, thereby improving the space utilization rate of the transformer. Several insulating layers 9 are arranged between the insulating clamp 5 and the equalizing pipe 2. This multi-layer insulation structure greatly improves the overall insulation performance. Compared with the traditional single-layer insulation structure, multi-layer insulation can better disperse the electric field intensity, avoiding insulation breakdown caused by local electric field concentration. At the same time, each insulating layer 9 can bear a part of the electric field stress. Even if a layer has a slight insulation defect or aging, the other layers can still provide reliable insulation protection. This significantly improves the insulation reliability and stability of the transformer lead equalizing pipe fixing structure and reduces the risk of transformer accidents caused by insulation failure. Several insulating support bars 6 are arranged between adjacent insulating layers. The insulating support bars 6 not only support and fix the insulating layers, but also optimize the electric field distribution. They can change the spatial structure between the insulating layers 9, making the electric field distribution more uniform inside the insulating layers, increasing the creepage distance, and improving safety and stability.

[0042] Example 2 See Figure 1 This utility model discloses a transformer lead equalizing tube fixing structure. The transformer lead equalizing tube includes an equalizing ball 1 and an equalizing tube 2. The equalizing ball 1 and the equalizing tube 2 are connected as a whole by blackened steel bolts inside the transformer. The transformer lead equalizing tube fixing structure includes a lifting seat 3. The equalizing ball 1 and the equalizing tube 2 are both disposed inside the lifting seat 3. The lifting seat 3 is provided with two insulating support structures to provide support and clamping for the equalizing tube 2. The two insulating support structures inside the lifting seat 3 are arranged at 30° inside the bent lifting seat to avoid interference between the two insulating support structures in the same plane, effectively reducing the overall height of the lifting seat 3 and improving the overall space utilization of the lifting seat 3.

[0043] See Figures 2 to 4 The outer wall of the riser seat 3 has a round hole and a connecting nut 7 is welded thereon. Compared with the conventional threaded seat welded inside the riser seat 3, this effectively avoids the possibility of discharge caused by uneven weld grinding and sharp corners and burrs in the welded threaded seat itself. The insulating support structure includes an insulating bracket 4 connected to the riser seat 3 through the connecting nut 7. The insulating bracket 4 is pried to an insulating clamp 5 by an insulating screw. The insulating clamp 5 is sleeved on the outside of the equalizing pipe 2, and several insulating layers 9 are provided between it and the equalizing pipe 2. Optionally, the insulating layer 9 is an insulating paper tube. Several insulating support strips 6 are provided between adjacent insulating layers. The insulating support strips 6 are bonded to the insulating layers 9 with casein glue. The included angle between adjacent insulating support strips 6 is 45°, and the length of the insulating support strips 6 between adjacent insulating layers 9 is the same. An insulating step 8 is circumferentially fixed to the outside of the equalizing pipe 2, and the insulating clamp 5 is engaged with the insulating step 8.

[0044] This utility model also provides a transformer, including the above-mentioned transformer lead equalizing tube fixing structure. This transformer has better safety and structural stability, simple structure, low modification cost, and is easy to install and maintain.

[0045] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the technical solution of the present utility model in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present utility model, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A transformer lead equalizing tube fixing structure, characterized in that, Includes a riser base, which has several insulating support structures inside to provide support and clamping for the equalizing pipe; The insulating support structure includes an insulating bracket connected to the riser, the insulating bracket being connected to an insulating clamp, the insulating clamp being sleeved on the outside of the equalizing pipe, and several insulating layers being provided between the clamp and the equalizing pipe; several insulating support strips are provided between adjacent insulating layers.

2. The transformer lead equalizing tube fixing structure according to claim 1, characterized in that, A connecting nut is provided on the outside of the housing of the lifting seat, and the insulating bracket is fixedly connected to the connecting nut.

3. The transformer lead equalizing tube fixing structure according to claim 1, characterized in that, The insulating bracket and the insulating clamp are connected by an insulating screw.

4. The transformer lead equalizing tube fixing structure according to claim 1, characterized in that, An insulating step is fixedly connected circumferentially to the outside of the equalizing pipe, and the insulating clamp is engaged with the insulating step.

5. The transformer lead equalizing tube fixing structure according to claim 1, characterized in that, The included angle between adjacent insulating support strips is 45°.

6. The transformer lead equalizing tube fixing structure according to claim 1, characterized in that, The insulating support strip is bonded to the insulating layer with casein adhesive.

7. The transformer lead equalizing tube fixing structure according to claim 1, characterized in that, The insulating support structure is configured as two layers, and the included angle between the two insulating support structures in space is 30°.

8. The transformer lead equalizing tube fixing structure according to claim 1, characterized in that, The insulating layer is an insulating paper tube.

9. The transformer lead equalizing tube fixing structure according to claim 1, characterized in that, The lengths of the insulating supports between adjacent insulating layers are the same.

10. A transformer, characterized in that, Includes the transformer lead equalizing tube fixing structure as described in any one of claims 1-9.

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