Miniaturized 110kV sleeve ascending flanged base

Abstract

The utility model discloses a miniaturized 110kV sleeve ascending flanged base, and relates to the technical field of transformer manufacturing. A traditional ascending flanged base is too large in diameter due to low insulation efficiency of a large oil gap. The insulating paper tube comprises an inner paper tube, at least one oil gap paper tube and an outer paper tube which are sequentially arranged from inside to outside, and the paper tubes are separated by oil gap stays; the oil gap between the inner paper tube and the pressure equalizing ball is 10-15mm, the oil gap between the adjacent paper tubes is 8-13mm, and the oil gap between the outer paper tube and the inner wall of the metal shell is 15-20mm; the lower end of the insulating paper tube is fixed on the lower assembling plate with a spigot, and the upper end is pressed by the upper assembling plate and penetrates through and is fixed by an insulating bolt to form an insulating device; according to the technical scheme, the space between the voltage-sharing ball and the shell is divided into multiple layers of small oil gaps, so that the electric field distribution is more uniform, the electric field resistance of the oil gaps is improved, the problem of low insulation efficiency of large oil gaps is solved, the diameter reduction of the 110kV sleeve ascending flanged base is facilitated, and meanwhile, the insulation safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer field especially relates to miniaturized 110kV bushing riser. BACKGROUND

[0002] Traditional 110kV bushing riser as the important component of 110kV outgoing line device, its inside arrangement bushing high voltage part (equalizing ball). Equalizing ball and riser shell are filled with transformer oil. As insulating medium, because the withstand voltage of single larger oil gap transformer oil is low, in order to guarantee the insulating safety, the diameter of traditional 110kV riser is usually about 500.

[0003] Excessive diameter leads to the forced increase of transformer oil tank width, promotes the steel consumption and processing complexity, needs to fill more transformer oil, and the size of oil storage tank is increased. The bulky structure increases transportation and installation cost.

[0004] Therefore, an innovative structure that can significantly reduce the diameter of the riser under the premise of ensuring insulating safety is urgently needed. SUMMARY

[0005] The utility model solves the technical problem and proposes the technical task to perfect and improve the prior art, provides miniaturized 110kV bushing riser, to realize the miniaturization of riser under the premise of guaranteeing the insulating safety. To this end, the utility model adopts the following technical scheme.

[0006] A kind of miniaturized 110kV bushing riser, including insulating paper tube, assembly plate and riser metal shell, the insulating paper tube is sequentially included inner paper tube, at least one oil gap paper tube and outer paper tube from inside to outside, each paper tube is separated by oil gap stay;

[0007] The oil gap between the inner paper tube and 110kV bushing equalizing ball is 10-15mm, the oil gap between adjacent paper tubes is 8-13mm, and the oil gap between the outer paper tube and the inner wall of the riser metal shell is 15-20mm;

[0008] The lower end of the insulating paper tube is fixed to the lower assembly plate with a stop, and the upper end is compressed by the upper assembly plate and fixed by the insulating bolt penetrating the upper and lower assembly plates to form an insulating device. The lower assembly plate and the upper assembly plate are both provided with oil and gas passage holes communicating with the oil gap.

[0009] The insulating device is installed inside the riser metal shell, so that the space between the equalizing ball and the shell is divided into multiple small oil gaps.

[0010] The technical scheme divides the oil gap by the multi-layer paper tube, converts the traditional single large oil gap into a 10mm-level oil gap network. The small oil gap structure makes the electric field distribution more uniform, the oil gap electric field strength is improved, and the problem of low insulation efficiency of large oil gap is solved. It is beneficial to reduce the inner diameter of the metal shell of the riser. The oil gap strut separates the paper tube to form a natural oil flow channel, avoiding the overheating risk caused by oil path blockage. The bolt is made of insulating material (such as nylon), which ensures the overall insulation performance; the insulating paper tube is fixed by the lower assembly plate and the upper assembly plate with a stopper, and is connected by insulating bolts, forming a rigid insulation device, which ensures the position accuracy of the multi-layer paper tube, avoids the structural deviation caused by vibration and other factors during operation, and ensures the stability of the oil gap size. The oil gap width ensures the smooth flow of oil between the shell and the outer paper tube, and cooperates with the oil and gas passage holes of the upper and lower assembly plates to form a three-dimensional heat dissipation network, which can quickly conduct the heat inside the riser to the outside, avoiding overheating or air pocket phenomenon, and reducing the insulation aging speed.

[0011] As a preferred technical means: the inner paper tube, the oil gap paper tube and the outer paper tube are all made of high-density insulating paper board T4, and the heights are the same; the lower end of the inner paper tube is embedded in the stopper on the inner diameter side of the lower assembly plate.

[0012] The high-density T4 paper board provides super-high dielectric strength, provides a rigid insulation barrier for the 10mm-level small oil gap structure, and completely blocks the surface discharge path. The equal-height design of the three-layer paper tube ensures that the electric field is uniformly distributed along the axial direction, eliminating the risk of end field strength distortion of the traditional stepped paper tube. The stopper embedded structure rigidly locks the lower end of the inner paper tube in the lower assembly plate, and the connection position is fixed and reliable. The equal-height three-paper tube + stopper embedded structure forms a modular assembly unit, which is beneficial to reduce the assembly time and improve the oil gap size qualification rate.

[0013] As a preferred technical means: the lower assembly plate and the upper assembly plate are both made of laminated wood board, and the board surface is uniformly distributed with φ8mm oil and gas passage holes;

[0014] The lower assembly plate and the upper assembly plate are connected and fixed by 4 insulating bolts.

[0015] The laminated wood board has super-high dry-state dielectric strength and compressive strength, and can withstand axial compression force of the paper tube without deformation; compared with the metal assembly plate, it eliminates eddy current loss, and compared with the pure insulating plastic plate, it avoids the risk of creep. The uniformly distributed φ8mm oil and gas passage holes form a three-dimensional flow network: the oil flow resistance is reduced, the flow rate is improved, zero air pocket dead zone is realized, and insulation deterioration caused by local overheating is eliminated. Uniform distribution of hole positions ensures temperature field gradient. The 4 insulating bolts are symmetrically fixed to form an over-determined constraint system, reducing the axial compression force deviation of the paper tube; the anti-vibration acceleration is improved, and the insulating bolt connection realizes non-destructive disassembly.

[0016] As a preferred technical means: a shielding ring formed by welding a round steel to the lower part of the riser metal shell is provided to support the insulation device and shield the electric field.

[0017] The round steel welded shielding ring forms an equipotential closed loop to eliminate the corona at the root of the bushing; compared with the split shielding ring, the zero assembly gap eliminates the risk of suspended discharge. Moreover, the round steel shielding ring acts as a reinforcing rib to improve the anti-deformation capacity of the shell.

[0018] As a preferred technical means: the upper part of the raised seat metal shell adopts a flange type or welded type structure.

[0019] The flange type / welded type dual-mode structure covers various installation scenarios and improves connection reliability.

[0020] As a preferred technical means: the outer wall of the outer paper tube is fixed by using an electrician's shrink tape to ensure the stability of the paper tube structure.

[0021] The electrician's shrink tape applies uniform circumferential pre-tightening force, reduces the radial deformation of the outer paper tube, and reduces the size fluctuation rate of the oil gap, which is conducive to improving the oil flow impact resistance.

[0022] As a preferred technical means: the inner diameter of the raised seat metal shell is less than or equal to φ320mm, and the surfaces and corners of all metal components are rounded.

[0023] On the basis of ensuring insulation safety, the technical solution realizes a small inner diameter. The surfaces and corners of metal components are rounded to realize a breakthrough in the safety size limit under a 110kV system and avoid the risk of surface flashover caused by miniaturization.

[0024] Beneficial effects:

[0025] By dividing the oil gap into multiple layers of paper tubes, the traditional single large oil gap is converted into a network of 10mm oil gaps, making the electric field distribution more uniform and significantly improving the oil gap's electric field strength;

[0026] Reducing the inner diameter of the raised seat metal shell (to ≤φ320mm) reduces the size of the transformer oil tank and the amount of steel used;

[0027] The oil gap strut forms a natural oil flow channel to avoid overheating caused by oil passage blockage and improve heat dissipation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the assembly cross-sectional structure of the raised seat of the utility model.

[0029] Figure 2 is a schematic diagram of the assembly top view structure of the raised seat of the utility model.

[0030] Figure 3 is a schematic diagram of the top view structure of the upper assembly plate of the utility model.

[0031] Figure 4 is a schematic diagram of the front view structure of the lower assembly plate of the utility model.

[0032] Figure 5 is the schematic view of the lower assembly plate of the utility model from the top.

[0033] Figure 6 is the schematic view of the shell of the utility model from the section.

[0034] In the figure: 1, upper assembly plate; 2, lower assembly plate; 3, inner paper tube; 4, oil gap paper tube; 5, outer paper tube; 6, shell; 7, equalizing ball; 8, oil gap strut; 9, insulating bolt; 10, shielding ring; 11, oil gas passage hole; 12, flange plate. DETAILED DESCRIPTION

[0035] The technical scheme of the utility model is further described in detail below in combination with the drawings of the specification.

[0036] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , the utility model provides a miniaturized 110kV bushing riser, which comprises an insulating paper tube, an assembly plate and a riser metal shell; the insulating paper tube comprises an inner paper tube 3, an oil gap paper tube 4 and an outer paper tube 5 from inside to outside, is fixed on the lower assembly plate 2, is compressed and fixed through the upper assembly plate 1 and constitutes a complete insulating device. The insulating device is fixed in the bushing riser, and the space between the 110kV bushing equalizing ball 7 and the riser metal shell 6 is divided into a small oil gap of about 10mm.

[0037] In order to make the insulating device have high insulating strength and mechanical support, in the embodiment, the materials of the inner paper tube 3, the oil gap paper tube 4 and the outer paper tube 5 are all high-density insulating paper board T4, the three have the same height and different diameters, and concentric arrangement is realized.

[0038] The inner paper tube 3 is the inner framework of the insulating device, the lower end is embedded in the stopper on the inner diameter side of the lower assembly plate 2, accurate positioning is realized, so that the oil gap between the inner paper tube 3 and the 110kV bushing equalizing ball 7 can be controlled to be 10-15mm,

[0039] The oil gap paper tube 4 is selected from high-density insulating paper board T4, and the insulating division performance is ensured. As the intermediate paper tube for dividing the oil gap, the number is greater than or equal to 1, and the number is determined according to the insulating requirement. The divided oil gap is about 10mm, and the oil gap paper tubes 4, the inner paper tube 3 and the outer paper tube 5 are all separated by oil gap struts 8, and the struts are uniformly arranged to ensure the uniformity of the oil gap.

[0040] The outer paper tube 5 is the outermost layer of the insulating device. It is tightly bound and fixed by an electrician's shrink band to ensure the stability of the multi-layer paper tube structure. The oil gap between the outer diameter of the outer paper tube 5 and the inner wall of the riser shell 6 is controlled to be 15-20mm.

[0041] Lower assembly plate 2, with electrical laminated wood plate, with insulation and mechanical strength. As the bottom bracket of the insulation device, the inner diameter side is provided with a stopper for fixing the inner paper tube 3, and the plate surface is distributed with φ8mm oil and gas passage holes 11. The stopper positions the inner paper tube 3, and the oil and gas passage holes 11 ensure the flow of transformer oil and gas, avoiding overheating or air pockets of the insulation device during operation.

[0042] Upper assembly plate 1, selected from electrical laminated wood plate, meets the requirements of insulation and mechanical compression. As the upper compression plate, the plate surface is distributed with φ8mm oil and gas passage holes 11, connected with the lower assembly plate 2 through 4 φ12 nylon material insulation bolts 9; compress the insulation paper tube, cooperate with the lower assembly plate 2 to form a stable insulation device, the oil and gas passage holes 11 are through with the lower assembly plate 2, ensure the smooth flow of oil and gas channel.

[0043] The upper and lower assembly plates 2 meet the mechanical strength, and the electrical strength is also verified by program.

[0044] In order to meet the requirements of electric field strength and reduce partial discharge of the product, the surface and corners of the raised seat shell 6 and other metal parts need to be rounded; φ20 round steel is welded on the lower inner side of the raised seat shell 6, which supports and fixes the insulation device while having the effect of electric field shielding ring 10; the round steel can improve the electric field distribution, reduce the local electric field strength, and avoid the concentration of electric field. The upper part of the raised seat metal shell 6 is divided into flange type and welding type according to the specific arrangement of the transformer, which is suitable for different installation scenes.

[0045] The thin paper tube small oil gap technology adopted in the transformer body structure of the technical solution can be applied to the 110kV raised seat structure, which can reduce the diameter of the raised seat shell 6 from the traditional φ500mm to φ280mm, directly reduce the width size of the transformer oil tank, obtain good economic benefits, and can be further popularized to 110kV and above super high voltage, such as 220kV and above super high voltage raised seat, by optimizing the number of layers of insulation paper tube and the size of oil gap, the miniaturization and cost optimization of higher voltage grade equipment can be realized.

[0046] Example two:

[0047] The same as example one will not be repeated, the difference is that, as shown in Figure 6 In this embodiment, a flange 12 is welded on the upper part of the raised seat metal shell 6, and the fixed assembly with external components is realized through flange connection.

[0048] The miniaturized 110kV bushing raised seat shown above is a specific embodiment of the utility model, which has embodied the substantial characteristics and progress of the utility model, and can be modified in shape, structure, etc. according to the actual use needs under the inspiration of the utility model, which is within the protection scope of the scheme.

Claims

1. A miniaturized 110kV bushing riser, comprising an insulating paper cylinder, an assembly plate and a riser metal shell (6), characterized in that: the insulating paper cylinder comprises, from inside to outside, an inner paper cylinder (3), at least one oil gap paper cylinder (4) and an outer paper cylinder (5), and the cylinders are separated by oil gap struts (8); the oil gap between the inner paper cylinder (3) and the 110kV bushing grading sphere (7) is 10-15mm, the oil gap between adjacent paper cylinders is 8-13mm, and the oil gap between the outer paper cylinder (5) and the inner wall of the riser metal shell (6) is 15-20mm; the lower end of the insulating paper cylinder is fixed to the lower assembly plate (2) with a stopper, the upper end is compressed by the upper assembly plate (1), and is fixed by insulating bolts (9) penetrating the upper and lower assembly plates to form an insulating device; the lower assembly plate (2) and the upper assembly plate (1) are both provided with oil and gas passage holes (11) communicating with the oil gap; the insulating device is installed inside the riser metal shell (6), so that the space between the grading sphere (7) and the shell (6) is divided into multiple small oil gaps. The inner paper cylinder (3), the oil gap paper cylinder (4) and the outer paper cylinder (5) are all made of high-density insulating paper board T4 and have the same height; the lower end of the inner paper cylinder (3) is embedded in the stopper on the inner diameter side of the lower assembly plate (2); the lower assembly plate (2) and the upper assembly plate (1) are both made of laminated wood board, and the board surface is uniformly distributed with φ8mm oil and gas passage holes (11); the lower assembly plate (2) and the upper assembly plate (1) are connected and fixed by 4 insulating bolts (9); the lower part of the riser metal shell (6) is welded with a shielding ring (10) formed by round steel to support the insulating device and shield the electric field; the upper part of the riser metal shell (6) adopts a flange type or a welded type structure; the outer wall of the outer paper cylinder (5) is fixed by electrician's shrink tape to ensure the stability of the paper cylinder structure; the inner diameter of the riser metal shell (6) is less than or equal to φ320mm, and the surface and edges of all metal parts are rounded. ​ ​ ​ 2. The compact 110 kV bushing riser of claim 1, wherein: ​ ​ 3. The compact 110 kV bushing riser of claim 1, wherein: ​ ​ 4. The compact 110 kV bushing riser of claim 1, wherein: ​ 5. The compact 110 kV bushing riser of claim 1, wherein: ​ 6. The compact 110 kV bushing riser of claim 2, wherein: ​ 7. The compact 110 kV bushing riser of claim 1, wherein: ​

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