Epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing and production method

Abstract

The present invention belongs to the technical field of ultra-high voltage AC transformer bushings, and in particular, relates to an epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing and a production method, comprising a mounting plate, both sides of the top of the mounting plate are fixedly connected with a fixing plate, a groove is provided in the middle of the top of the mounting plate, and a mounting mechanism is fixedly connected in the groove. The epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing and the production method, through the provided mounting mechanism, play a good protective role on the transformer bushing, by winding the epoxy resin impregnated glass fiber at high temperature, controlling the step temperature change, promoting the initial curing process of the bushing core, achieving a reasonable distribution of the bushing field strength, and reducing the cumulative error in the actual winding process; the epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing vertical installation tooling is designed to improve the assembly efficiency of the ultra-high voltage rubber impregnated fiber transformer bushing.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-high voltage bushing development, in particular to an epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing and a production method thereof. Background Art

[0002] At present, the UHV AC transformer bushings used in my country's UHV AC projects are basically imported oil-impregnated paper bushings. However, the operating conditions in recent years have shown that some oil-impregnated paper bushings have problems such as discharge, gas production, leakage, and joint heating, and potential oil leakage, explosion and combustion risks. A major fire accident occurred in the grid-side bushing of the UHV converter transformer at Tianshan Station and a burst failure occurred in the grid-side bushing of the UHV converter transformer at Yibin Station, which seriously affected the safety and stability of the power grid and caused huge economic losses. The import substitution and reliability improvement of UHV AC transformer bushings need to be solved urgently. The glue-impregnated fiber dry bushing mainly uses epoxy resin and glass fiber materials, which has the advantages of oil-free, flame retardant and explosion-proof, and high mechanical strength. Moreover, from raw material procurement to production equipment, it is domestically produced. It is a technical route that can improve the reliability of the bushing, realize the localization of high-end bushings, and break the long-term monopoly of foreign manufacturers.

[0003] The technical difficulties of using this process are as follows: (1) The winding temperature of epoxy resin impregnated glass fiber will affect the initial curing process of the bushing core. If the temperature is not well controlled, the bushing core will have stratification problems during post-curing; (2) The design of the length and thickness of the capacitor screen of the epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing core will affect the bushing field strength distribution, and it is difficult to control the field strength inside the bushing; (3) The epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing core is long and heavy, and it is difficult to accurately install it with the bushing flange and hollow composite jacket; (4) After the existing transformer bushing is used, there is no fixed placement base, which is easy to damage the transformer bushing and cannot provide good protection for the transformer bushing. Summary of the invention

[0004] The object of the present invention is to provide an epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing and a production method thereof, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing, comprising a mounting plate, fixed plates are fixedly connected to both sides of the top of the mounting plate, a groove is opened in the middle of the top of the mounting plate, a mounting mechanism is fixedly connected in the groove, an anti-slip pad is fixedly connected to the left side of the top of the mounting plate, a hollow composite jacket is arranged on the top of the anti-slip pad, the top and bottom of the hollow composite jacket are fixedly connected to the transformer bushing flange, a shell is fixedly connected in the hollow composite jacket, a transformer bushing core is fixedly connected in the shell, a special-shaped base is fixedly connected to the right side of the top of the mounting plate, and a shell is arranged on the top of the special-shaped base.

[0006] The mounting mechanism comprises a first support rod, the first support rod is slidably connected in a fixed plate, a second positioning plate is fixedly connected to the left side of the first support rod, and a second spring is sleeved on the outer surface of the right side of the first support rod.

[0007] Preferably, a U-shaped clamping plate is fixedly connected to the right side of the first support rod, the second spring is arranged between the fixing plate and the U-shaped clamping plate, the left side of the second spring is fixedly connected to the fixing plate, and the right side of the second spring is fixedly connected to the U-shaped clamping plate.

[0008] Preferably, the top and bottom of the U-shaped clamping plate are both fixedly connected with a first spring, the bottom of the first spring is fixedly connected with a first positioning plate, and the bottom of the first positioning plate is fixedly connected with a first rubber pad.

[0009] Preferably, a U-shaped mounting shell is fixedly connected in the groove, a fourth spring is fixedly connected to the bottom of the U-shaped mounting shell, a connecting plate is fixedly connected to the top of the fourth spring, and second support rods are fixedly connected to both sides of the top of the connecting plate.

[0010] Preferably, the second support rod is slidably connected in the U-shaped mounting shell, the top of the second support rod is fixedly connected to an arc-shaped base, and the middle of the bottom of the arc-shaped base is fixedly connected to a third spring.

[0011] Preferably, a threaded hole is opened in the fixing plate, a bolt is threadedly connected in the threaded hole, a T-shaped plate is rotatably connected to the left side of the bolt, a second rubber pad is fixedly connected in the T-shaped plate, a connecting rod is fixedly connected to the bottom and top of the right side of the T-shaped plate, a limiting block is fixedly connected to the right side of the connecting rod, and the connecting rod is inserted in the fixing plate.

[0012] Preferably, a U-shaped placement seat is fixedly connected to the top of the mounting plate, and a third rubber pad is fixedly connected to the bottom of the U-shaped placement seat.

[0013] Another technical problem to be solved by the present invention is to provide a production method of epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing to solve the problems raised in the above background technology;

[0014] To achieve the above object, the present invention provides the following technical solution: comprising the following steps:

[0015] S1. Core winding

[0016] The length parameters of each layer of capacitor screen are designed according to the insulation requirements, and the thickness of each two layers of capacitors is equal to a parameter within 2.0mm-5.5mm. The winding machine program is set according to the sleeve design parameters, and the winding temperature is 85-125℃. During the winding process of the sleeve core, the core is in a preliminary curing state.

[0017] S2, core curing

[0018] After the core is wound, it is sent into the oven and the reasonable oven temperature and duration are set to ensure that the core is completely cured.

[0019] S3. Machining of the cured core

[0020] Processing is carried out according to the core design drawings, with the rough machining feed amount not exceeding 0.4mm and the fine machining feed amount not exceeding 0.1mm to complete the core machining.

[0021] S4, glue assembly of core and flange

[0022] The inner wall of the flange is polished and cleaned, the inner wall of the flange is evenly coated with adhesive, and after pre-heating in an oven, the flange is fixed at the appropriate position of the core and the sealing ring is installed. Use a glue injection gun to inject glue at the injection hole of the flange and let it stand for 24 hours to ensure that the epoxy resin is completely cured.

[0023] S5. Casing machine assembly

[0024] A bushing assembly tool was designed. First, the bushing core with the flange glued on was vertically fixed on the assembly tool, and the flange mounting hole was marked. The hollow composite jacket was lifted to the top of the bushing core by a crane. Three metal rods were passed through the mounting holes of the hollow composite jacket and aligned with the bushing flange mounting holes. The crane moved the hollow composite jacket downward in the vertical direction. After the mounting holes of the hollow composite jacket were aligned with the mounting holes of the bushing flange, the three metal rods were taken out and fixed with screws and nuts. The assembly of the UHV glue-impregnated fiber transformer bushing was completed within 18 hours.

[0025] S6. Casing test

[0026] Carry out various casing inspection tests in accordance with the national standard GB / T 4109-2008.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The epoxy resin impregnated glass fiber UHV AC transformer bushing and production method, by winding the epoxy resin impregnated glass fiber at a high temperature of 85°C-125°C, control the step temperature change, and promote the initial curing process of the bushing core; the length of each layer of the capacitor screen wound with a semi-conductive tape is designed according to the insulation requirements, and the thickness of each layer is designed within the range of 2.0mm-5.5mm, so as to achieve a reasonable distribution of the bushing field strength, and the equal thickness design method reduces the difficulty of the bushing core winding process and reduces the accumulated error in the actual winding process; the epoxy resin impregnated glass fiber UHV AC transformer bushing vertical installation tooling is designed, and the metal rod is used to guide the installation process, so as to improve the assembly efficiency of the UHV epoxy impregnated fiber transformer bushing.

[0029] 2. The epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing and production method, through the provided installation mechanism, play a good protective role on the transformer bushing, and to a certain extent improve the service life of the transformer bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0032] Figure 3 It is a schematic cross-sectional view of a part of the structure of the installation mechanism of the present invention;

[0033] Figure 4 It is a schematic cross-sectional view of a part of the structure of the installation mechanism of the present invention;

[0034] Figure 5 It is a schematic cross-sectional view of a part of the structure of the installation mechanism of the present invention;

[0035] Figure 6 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0036] Figure 7 The figure is a flow chart of an embodiment of the present invention.

[0037] In the figure: 1. transformer bushing flange; 2. mounting mechanism; 21. first spring; 22. first rubber pad; 23. U-shaped clamping plate; 24. first positioning plate; 25. second positioning plate; 26. second spring; 27. first support rod; 28. arc-shaped base; 29. ​​second support rod; 201. U-shaped mounting shell; 202. third spring; 203. connecting plate; 204. fourth spring; 205. limit block; 206. bolt; 207. T-plate; 208. second rubber pad; 209. connecting rod; 211. U-shaped placement seat; 212. third rubber pad; 3. hollow composite jacket; 4. fixing plate; 5. transformer bushing core; 6. shell; 7. mounting plate; 8. groove; 9. special-shaped base. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1-7 The present invention provides a technical solution: an epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing, comprising a mounting plate 7, fixed plates 4 are fixedly connected to both sides of the top of the mounting plate 7, a groove 8 is opened in the middle of the top of the mounting plate 7, a mounting mechanism 2 is fixedly connected in the groove 8, an anti-skid pad is fixedly connected to the left side of the top of the mounting plate 7, a hollow composite jacket 3 is arranged on the top of the anti-skid pad, a transformer bushing flange 1 is fixedly connected to the top and bottom of the hollow composite jacket 3, a shell 6 is fixedly connected in the hollow composite jacket 3, a transformer bushing core 5 is fixedly connected in the shell 6, a special-shaped base 9 is fixedly connected to the right side of the top of the mounting plate 7, and a shell 6 is arranged on the top of the special-shaped base 9.

[0040] The mounting mechanism 2 includes a first support rod 27, which is slidably connected to the fixing plate 4, a second positioning plate 25 is fixedly connected to the left side of the first support rod 27, a second spring 26 is sleeved on the right outer surface of the first support rod 27, a U-shaped clamping plate 23 is fixedly connected to the right side of the first support rod 27, the second spring 26 is arranged between the fixing plate 4 and the U-shaped clamping plate 23, the left side of the second spring 26 is fixedly connected to the fixing plate 4, the right side of the second spring 26 is fixedly connected to the U-shaped clamping plate 23, the top and bottom of the U-shaped clamping plate 23 are fixedly connected to the first spring 21, the bottom of the first spring 21 is fixedly connected to the first positioning plate 24, the bottom of the first positioning plate 24 is fixedly connected to the first rubber pad 22, a U-shaped mounting shell 201 is fixedly connected to the groove 8, the bottom of the U-shaped mounting shell 201 is fixedly connected to the fourth spring 204, the fourth spring 2 04 is fixedly connected with a connecting plate 203 on the top, and second support rods 29 are fixedly connected with both sides of the top of the connecting plate 203. The second support rod 29 is slidably connected in the U-shaped mounting shell 201. The top of the second support rod 29 is fixedly connected with an arc base 28, and the middle of the bottom of the arc base 28 is fixedly connected with a third spring 202. A threaded hole is opened in the fixing plate 4, and a bolt 206 is threadedly connected in the threaded hole. A T-shaped plate 207 is rotatably connected to the left side of the bolt 206, and a second rubber pad 208 is fixedly connected in the T-shaped plate 207. A connecting rod 209 is fixedly connected to the bottom and top of the right side of the T-shaped plate 207. The right side of the connecting rod 209 is fixedly connected to the limiting block 205, and the connecting rod 209 is inserted in the fixing plate 4. A U-shaped placement seat 211 is fixedly connected to the top of the mounting plate 7, and a third rubber pad 212 is fixedly connected to the bottom of the U-shaped placement seat 211.

[0041] The present invention provides a production method for epoxy resin impregnated glass fiber ultra-high voltage AC transformer bushing to solve another technical problem, comprising the following steps:

[0042] S1. Core winding

[0043] The length parameters of each layer of capacitor screen are designed according to the insulation requirements, and the thickness of each two layers of capacitors is equal to a parameter within 2.0mm-5.5mm. The winding machine program is set according to the sleeve design parameters, and the winding temperature is 85-125℃. During the winding process of the sleeve core, the core is in a preliminary curing state.

[0044] S2, core curing

[0045] After the core is wound, it is sent into the oven and the reasonable oven temperature and duration are set to ensure that the core is completely cured.

[0046] S3. Machining of the cured core

[0047] Processing is carried out according to the core design drawings, with the rough machining feed amount not exceeding 0.4mm and the fine machining feed amount not exceeding 0.1mm to complete the core machining.

[0048] S4, glue assembly of core and flange

[0049] The inner wall of the flange is polished and cleaned, the inner wall of the flange is evenly coated with adhesive, and after pre-heating in an oven, the flange is fixed at the appropriate position of the core and the sealing ring is installed. Use a glue injection gun to inject glue at the injection hole of the flange and let it stand for 24 hours to ensure that the epoxy resin is completely cured.

[0050] S5. Casing machine assembly

[0051] A bushing assembly tool was designed. First, the bushing core with the flange glued on was vertically fixed on the assembly tool, and the flange mounting hole was marked. The hollow composite jacket was lifted to the top of the bushing core by a crane. Three metal rods were passed through the mounting holes of the hollow composite jacket and aligned with the bushing flange mounting holes. The crane moved the hollow composite jacket downward in the vertical direction. After the mounting holes of the hollow composite jacket were aligned with the mounting holes of the bushing flange, the three metal rods were taken out and fixed with screws and nuts. The assembly of the UHV glue-impregnated fiber transformer bushing was completed within 18 hours.

[0052] S6. Casing test

[0053] Carry out various casing inspection tests in accordance with the national standard GB / T 4109-2008.

[0054] When the transformer bushing is used up, first clamp the left side of the transformer bushing core 5 between the U-shaped clamping plates 23. Through the squeezing of the transformer bushing core 5, the two first positioning plates 24 move in directions away from each other. At this time, the first spring 21 is in a compressed state, so that the two first rubber pads 22 are tightly against the transformer bushing core 5, which plays a role in fixing the transformer bushing core 5. While squeezing the transformer bushing core 5, the U-shaped clamping plate 23 is driven to move to the left in the horizontal direction, and the first support rod 27 is driven to slide to the left in the horizontal direction. At this time, the second spring 26 is in a compressed state. Then, the transformer bushing is placed on the top of the mounting plate 7. When the bottom of the transformer bushing flange 1 is tightly against the top of the arc-shaped base 28, a vertical downward pressure is applied through the transformer bushing flange 1 to drive the arc-shaped base The seat 28 moves downward in the vertical direction. At this time, the third spring 202 is in a compressed state, and the arc-shaped base 28 drives the second support rod 29 to move downward in the vertical direction, and drives the connecting plate 203 to move downward in the vertical direction. At this time, the fourth spring 204 is in a compressed state, which can buffer the transformer bushing flange 1. At the same time, the anti-slip pad fixedly connected to the top of the mounting plate 7 is tightly against the bottom of the hollow composite jacket 3, and the raised part on the right side of the hollow composite jacket 3 is inserted into the U-shaped placement seat 211, which has a stabilizing effect on the shell 6. When the right side of the transformer bushing core 5 is clamped into the special-shaped base 9, the bolt 206 is turned, and the bolt 206 drives the T-plate 207 to move leftward in the horizontal direction, so that the second rubber pad 208 inside the T-plate 207 is tightly against the transformer bushing core 5.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An epoxy resin impregnated glass fiber UHV AC transformer bushing, comprising a mounting plate (7), Features: Both sides of the top of the mounting plate (7) are fixedly connected to fixing plates (4); a groove (8) is provided in the middle of the top of the mounting plate (7); a mounting mechanism (2) is fixedly connected in the groove (8); an anti-skid pad is fixedly connected to the left side of the top of the mounting plate (7); a hollow composite jacket (3) is arranged on the top of the anti-skid pad; a transformer bushing flange (1) is fixedly connected to the top and bottom of the hollow composite jacket (3); a shell (6) is fixedly connected in the hollow composite jacket (3); a transformer bushing core (5) is fixedly connected in the shell (6); a special-shaped base (9) is fixedly connected to the right side of the top of the mounting plate (7); and the shell (6) is arranged on the top of the special-shaped base (9); The mounting mechanism (2) comprises a first support rod (27), the first support rod (27) being slidably connected to the fixing plate (4), a second positioning plate (25) being fixedly connected to the left side of the first support rod (27), and a second spring (26) being sleeved on the outer surface of the right side of the first support rod (27); The first support rod (27) is fixedly connected to a U-shaped clamping plate (23) on the right side, the second spring (26) is arranged between the fixing plate (4) and the U-shaped clamping plate (23), the second spring (26) is fixedly connected to the fixing plate (4) on the left side, and the second spring (26) is fixedly connected to the U-shaped clamping plate (23) on the right side; The top and bottom of the U-shaped clamping plate (23) are both fixedly connected to a first spring (21), the bottom of the first spring (21) is fixedly connected to a first positioning plate (24), and the bottom of the first positioning plate (24) is fixedly connected to a first rubber pad (22); A U-shaped mounting shell (201) is fixedly connected in the groove (8), a fourth spring (204) is fixedly connected to the bottom of the U-shaped mounting shell (201), a connecting plate (203) is fixedly connected to the top of the fourth spring (204), and second support rods (29) are fixedly connected to both sides of the top of the connecting plate (203); The second support rod (29) is slidably connected in the U-shaped mounting shell (201); the top of the second support rod (29) is fixedly connected to an arc-shaped base (28); and the middle of the bottom of the arc-shaped base (28) is fixedly connected to a third spring (202); The fixing plate (4) is provided with a threaded hole, a bolt (206) is threadedly connected to the threaded hole, a T-shaped plate (207) is rotatably connected to the left side of the bolt (206), a second rubber pad (208) is fixedly connected to the inside of the T-shaped plate (207), a connecting rod (209) is fixedly connected to the bottom and top of the right side of the T-shaped plate (207), the right side of the connecting rod (209) is fixedly connected to a limiting block (205), and the connecting rod (209) is inserted into the fixing plate (4); A U-shaped placement seat (211) is fixedly connected to the top of the mounting plate (7), and a third rubber pad (212) is fixedly connected to the bottom of the U-shaped placement seat (211).

2. The method for producing the epoxy resin impregnated glass fiber UHV AC transformer bushing according to claim 1, It is characterized in that The following steps are involved: S1. Core winding The length parameters of each layer of capacitor screen are designed according to the insulation requirements. The thickness of each two layers of capacitor is equal and takes the parameters within 2.0mm-5.5mm. The winding machine program is set according to the design parameters of the sleeve. The winding temperature is 85~125℃. During the winding process of the sleeve core, the inside of the core is in a preliminary curing state. S2, core curing After the core is wound, it is sent to the oven and the preset oven temperature and duration are set to ensure that the core is fully cured; S3. Machining of the cured core Process according to the core design drawings, with the rough machining feed not exceeding 0.4mm and the fine machining feed not exceeding 0.1mm to complete the core machining; S4, glue assembly of core and flange The inner wall of the flange is polished and cleaned, the inner wall of the flange is evenly coated with adhesive, and after pretreatment in an oven, the flange is fixed at the appropriate position of the core and the sealing ring is installed. The glue injection gun is used to inject glue at the injection hole of the flange, and it is left to stand for 24 hours to ensure that the epoxy resin is completely cured; S5. Casing machine assembly First, fix the bushing core with the flange glued on vertically on the assembly tool, and mark the flange installation hole position. Use a crane to lift the hollow composite jacket to the top of the bushing core. Use a metal rod to pass through the installation hole of the hollow composite jacket and align it with the bushing flange installation hole. Use the crane to move the hollow composite jacket downward in the vertical direction. After the installation hole of the hollow composite jacket is aligned with the installation hole of the bushing flange, take out the metal rod and install and fix it with screws and nuts to complete the assembly of the UHV rubber-impregnated fiber transformer bushing. S6. Casing test The casing inspection test is carried out according to the national standard GB / T 4109-2008.

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