Extra-high voltage transformer bolt connection energy discharge reinforcing structure

Abstract

The utility model relates to an extra-high voltage transformer bolt connection energy discharge reinforcing structure, and belongs to the technical field of transformer equipment. According to the technical scheme, an energy discharging support is made of elastic materials and composed of an inner ring and an outer ring which are arranged inside and outside, the inner ring and the outer ring are arranged in a high-low mode and connected through a longitudinally-arranged connecting ring, and the whole energy discharging support is of a stepped ring-shaped structure; the inner ring and the outer ring are provided with a plurality of through holes distributed in the circumferential direction, the energy discharging support covers the bottom flange and the connecting flange, the inner ring covers the upper end face of the bottom flange, the outer ring covers the upper end face of the connecting flange and is connected with the upper end face of the connecting flange through reinforcing bolts, and the lower flange of the ascending flanged base is arranged on the upper end face of the inner ring. A connecting bolt penetrates through the lower flange, the inner ring and the bottom flange to fasten the ascending flanged base, the energy unloading support and the bottom flange together. The utility model has the positive effects that fault impact energy can be effectively and directionally released, the energy unloading bracket is broken, the main bolt is protected from being damaged, and the safety of the whole structure is ensured.

Description

Technical Field

[0001] The utility model relates to an energy-dissipating and strengthening structure for bolt connection of ultra-high voltage transformers, belonging to the technical field of transformer equipment. Background Art

[0002] With the continuous development of power transmission projects in China, the transmission voltage of the power grid has been continuously increased. In recent years, the state has vigorously promoted ultra-high voltage power transmission projects, and transformers with voltage levels of 750 kV and 1000 kV on the grid side have been gradually applied to engineering construction. At the same time, in recent years, short-circuit faults of transformers have occurred frequently, posing higher requirements for the impact resistance of the structure of ultra-high voltage transformers.

[0003] After the voltage level on the high-voltage grid side is increased, the diameter and weight of the high-voltage bushing increase, and at the same time, the diameter of the elevated seat on the high-voltage side also increases. The fault energy at a high voltage level is necessarily large, and the requirement for the bolt connection strength at the connection of the elevated seat is increased.

[0004] According to the results of the damage caused by transformer faults in recent years, the bolt connection is a weak area in terms of strength. After a fault occurs, the connecting bolts often break. Designing an energy-dissipating and strengthening structure for bolts has become a difficult problem that needs to be solved urgently. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an energy-dissipating and strengthening structure for bolt connection of ultra-high voltage transformers, which can effectively solve the problem of weak strength at the bolt connection under the impact of internal energy of the transformer after a fault occurs in a high-voltage grid, and has the ability of directional destruction. Without breaking the main bolts, the impact energy can be released to ensure the safety and reliability of the overall structure, and solve the above problems existing in the background art.

[0006] The technical solution of the utility model is as follows:

[0007] A bolt connection energy-dissipating and reinforcement structure for an ultra-high voltage transformer, comprising a riser, a bottom flange, a reinforcement bottom plate, connecting bolts, an energy-dissipating bracket and reinforcement bolts. The reinforcement bottom plate is provided with openings, and connecting flanges are arranged at the openings. The connecting flange of the reinforcement bottom plate is sleeved outside the bottom flange on the transformer tank cover, and the reinforcement bottom plate is welded to the transformer tank cover. The upper end surface of the bottom flange is higher than the upper end surface of the connecting flange. The energy-dissipating bracket is made of elastic or plastic material. The energy-dissipating bracket consists of an inner ring and an outer ring arranged inside and outside. The inner ring and the outer ring are arranged at different heights and are connected by a longitudinally arranged connecting ring, presenting an overall stepped ring-shaped structure. A plurality of through holes are arranged on the inner ring and the outer ring along the circumferential direction. The energy-dissipating bracket covers the bottom flange and the connecting flange, wherein the inner ring covers the upper end surface of the bottom flange, the outer ring covers the upper end surface of the connecting flange and is connected by the reinforcement bolts. The lower flange of the riser is arranged on the upper end surface of the inner ring, and the connecting bolts pass through the lower flange, the inner ring and the bottom flange to fasten the riser, the energy-dissipating bracket and the bottom flange together.

[0008] Further, the height of the connecting ring is the same as the distance from the upper end surface of the bottom flange to the upper end surface of the connecting flange.

[0009] Further, the lower flange of the riser, the energy-dissipating bracket and the axis of the bottom flange are concentric.

[0010] The positive effect of the present utility model: Since the energy-dissipating bracket has elastic and plastic capabilities and is rigidly matched with the entire flange bolt structure, when the internal fault energy of the riser impacts, the energy-dissipating and reinforcement structure can effectively release the fault impact energy in a directional manner, the energy-dissipating bracket breaks, protecting the main bolts from being damaged and ensuring the safety of the overall structure. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the present utility model;

[0012] Figure 2 It is a schematic structural diagram of the energy-dissipating bracket of the present utility model;

[0013] Figure 3 It is a schematic installation structure diagram of the reinforcement bottom plate and the bottom flange of the present utility model;

[0014] In the figure: riser 1, lower flange 101, bottom flange 2, reinforcement bottom plate 3, connecting flange 301, connecting bolt 4, energy-dissipating bracket 5, inner ring 501, outer ring 502, connecting ring 503, reinforcement bolt 6. Detailed Embodiment

[0015] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0016] Refer to the attached Figures 1-3, this embodiment provides a bolt connection energy-dissipating and reinforcement structure for an ultra-high voltage transformer, which includes a riser 1, a bottom flange 2, a reinforcement bottom plate 3, connecting bolts 4, an energy-dissipating bracket 5, and reinforcement bolts 6. The reinforcement bottom plate 3 is provided with holes, and a connecting flange 301 is provided at the hole. The connecting flange 301 of the reinforcement bottom plate 3 is sleeved outside the bottom flange 2 on the transformer tank cover, and the reinforcement bottom plate 3 is welded to the transformer tank cover. The upper end surface of the bottom flange 2 is higher than the upper end surface of the connecting flange 301; the energy-dissipating bracket 5 is made of elastic or plastic material, for example: rubber. The energy-dissipating bracket 5 is composed of an inner ring 501 and an outer ring 502 arranged inside and outside. The inner ring 501 and the outer ring 502 are arranged at different heights and are connected by a longitudinally arranged connecting ring 503, presenting an overall stepped ring-shaped structure; a plurality of through holes are arranged on the inner ring 501 and the outer ring 502 in the circumferential direction. The energy-dissipating bracket 5 covers above the bottom flange 2 and the connecting flange 301, wherein the inner ring 501 covers the upper end surface of the bottom flange 2, the outer ring 502 covers the upper end surface of the connecting flange 301 and is connected by the reinforcement bolt 6. The lower flange 101 of the riser 1 is arranged on the upper end surface of the inner ring 501, and the connecting bolt 4 passes through the lower flange 101, the inner ring 501, and the bottom flange 2 to fasten the riser 1, the energy-dissipating bracket 5, and the bottom flange 2 together.

[0017] The height of the connecting ring 503 is the same as the distance from the upper end surface of the bottom flange 2 to the upper end surface of the connecting flange 301.

[0018] The axis of the lower flange 101 of the riser 1, the energy-dissipating bracket 5, and the bottom flange 2 is concentric.

[0019] Preferably, the energy-dissipating bracket 5 is an integrally formed structure.

[0020] The inner diameter of the inner ring 501 of the energy-dissipating bracket is the same as the inner diameter of the bottom flange 2, and the outer diameter of the inner ring 501 of the energy-dissipating bracket is slightly larger than the outer diameter of the bottom flange 2; the inner diameter of the outer ring 502 of the energy-dissipating bracket is slightly larger than the inner diameter of the connecting flange 301, and the outer diameter of the outer ring 502 of the energy-dissipating bracket is the same as the outer diameter of the connecting flange 301.

[0021] The bottom flange 2 is welded to the opening of the box cover. The reinforcement bottom plate 3 is sleeved outside the bottom flange 2. The inner diameter of the connecting flange 301 of the reinforcement bottom plate 3 is slightly larger than the outer diameter of the bottom flange 2. The energy dissipation support 5 completely covers the upper end faces of the bottom flange 2 and the connecting flange 301. The through holes on the outer ring 502 of the energy dissipation support 5 are aligned with the bolt holes on the connecting flange 301 of the reinforcement bottom plate 3. The outer ring 502 of the energy dissipation support 5 is fixed to the connecting flange 301 of the reinforcement bottom plate 3 through the reinforcement bolts 6. The through holes on the inner ring 501 of the energy dissipation support 5 are aligned with the threaded holes of the bottom flange 2. The lower flange 101 of the lifting seat 1 and the bottom flange 2 are connected by the connecting bolts 4. The connecting bolts 4 simultaneously pass through the through holes on the inner ring 501 sandwiched between the lower flange 101 and the bottom flange 2, fastening the lifting seat 1, the energy dissipation support 5 and the bottom flange 2 together.

[0022] When a failure occurs inside the lifting seat 1, the impact energy acts on the lifting seat 1. The bolt connection with weak strength will surely be the energy release port. To avoid the main connecting bolts from being damaged and broken, the energy dissipation support is made of elastic or plastic material, has good elastic or plastic ability, and is rigidly matched with the entire bolt structure. The energy dissipation and reinforcement structure can effectively release the fault impact energy in a directional manner. The energy dissipation support ruptures to release energy, protecting the connecting bolts from being damaged, thus ensuring the safety of the overall structure.

Claims

1. A bolt connection energy-dissipating and reinforcement structure for an ultra-high voltage transformer, characterized in that: It includes a riser base (1), a bottom flange (2), a reinforcing base plate (3), connecting bolts (4), an energy-dissipating support (5) and reinforcing bolts (6). The reinforcing base plate (3) is provided with an opening, and a connecting flange (301) is arranged at the opening. The connecting flange (301) of the reinforcing base plate (3) is sleeved on the outside of the bottom flange (2) on the transformer tank cover. The reinforcing base plate (3) is welded to the transformer tank cover, and the upper end surface of the bottom flange (2) is higher than the upper end surface of the connecting flange (301). The energy-dissipating support (5) is made of elastic or plastic material. The energy-dissipating support (5) consists of an inner ring (501) and an outer ring (502) arranged inside and outside. The inner ring (501) and the outer ring (502) are arranged at different heights and are connected by a longitudinally arranged connecting ring (503), showing an overall stepped ring structure. A plurality of through holes are arranged on the inner ring (501) and the outer ring (502) in the circumferential direction. The energy-dissipating support (5) covers the upper parts of the bottom flange (2) and the connecting flange (301). Among them, the inner ring (501) covers the upper end surface of the bottom flange (2), and the outer ring (502) covers the upper end surface of the connecting flange (301) and is connected by the reinforcing bolts (6). The lower flange (101) of the riser base (1) is arranged on the upper end surface of the inner ring (501). The connecting bolts (4) penetrate through the lower flange (101), the inner ring (501) and the bottom flange (2) to fasten the riser base (1), the energy-dissipating support (5) and the bottom flange (2) together.

2. The energy-dissipating and reinforcement structure for bolt connection of an ultra-high voltage transformer according to claim 1, wherein: The height of the connecting ring (503) is the same as the distance from the upper end surface of the bottom flange (2) to the upper end surface of the connecting flange (301).

3. The energy-dissipating and reinforcement structure for bolt connection of an UHV transformer according to claim 1 or 2, characterized in that: The lower flange (101) of the riser base (1), the energy-dissipating support (5) and the axis of the bottom flange (2) are concentric.

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