Process method for improving anti-seismic property of transformer bushing

Abstract

The invention relates to the technical field of transformer shock resistance, and particularly discloses a process method for improving the shock resistance of a transformer bushing. The technological method comprises the following steps that spring buckles are dismantled one by one, and a first annular cavity is cleaned; a hole is formed between the sealing flange and the spring buckle; an organic grouting material is poured into the first annular cavity at least twice, and the first annular cavity is filled with the organic grouting material; and after the organic grouting material is hardened, the first anti-seismic layer is obtained. Therefore, the problems that in the prior art, a transformer bushing is poor in anti-seismic performance and prone to being damaged due to earthquakes are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of transformer anti-seismic technology, and particularly relates to a process method for improving the anti-seismic performance of a transformer bushing. BACKGROUND

[0002] As an important part of large complex lifeline system, the power system plays an indispensable role in modern society. Once the transformer, as the core equipment of the power system, is damaged in an earthquake, it will lead to the failure of the related line, and further affect the normal operation of the entire power system. In order to improve the safety of the power system and ensure the normal operation of the transformer after the earthquake, it is necessary to improve the anti-seismic performance of the transformer, which has become an important content that cannot be ignored in the field of power engineering.

[0003] Among various components of the transformer, the bushing is a very important part, but it has high seismic vulnerability. In the domestic and foreign earthquakes, the transformer bushing has been severely damaged, and the damage forms mainly include porcelain sleeve fracture, transition flange fracture, rubber gasket extrusion oil leakage and bushing root displacement, etc.

[0004] Among them, the common structure of the bushing is composed of a central conductive rod, a flange, an upper and lower porcelain sleeve and a rubber gasket. The upper porcelain sleeve and the flange of the buckle type bushing are provided with a spring buckle, and the spring buckle fastens the two together by using spring pressure. This connection mode greatly reduces the anti-seismic performance of the buckle type bushing. Under the action of the earthquake, the spring buckle of the buckle type bushing is easy to loosen, which makes the relative displacement between the porcelain sleeve and the flange easy to produce, the rubber gasket is extruded and displaced, and then the bushing leaks oil. At the same time, the transition flange below the bushing also has high vulnerability in the earthquake, and the transition flange has been damaged many times in the past earthquakes.

[0005] In the field of transformer anti-seismic technology, it has been shown that the addition of stiffening ribs and diagonal braces at the transformer tank part can improve the anti-seismic performance of the transformer bushing. However, due to the unique structural characteristics of the transformer bushing, the applicability of the existing treatment method to the buckle type bushing is greatly limited, and it is also difficult to fundamentally solve the structural problems of the buckle type bushing under the action of the earthquake. In addition, the connection structure of the flange part in the transformer bushing is complex, there are many parts, and it bears complex electrical functions. When improving the anti-seismic performance of the buckle type bushing, it is necessary to consider the economy, the operation environment of the bushing and other factors, and also avoid affecting the electrical functions of the bushing.

[0006] In view of the high seismic vulnerability of the current transformer bushing, it is necessary to optimize and improve the anti-seismic performance of the transformer bushing, so as to improve the anti-seismic performance of the transformer bushing under the action of the earthquake, reduce the economic loss caused by the post-earthquake damage of the buckle type bushing, and ensure the stability and safety of the people's electricity. SUMMARY

[0007] The present application aims to provide a process for improving the anti-seismic performance of a transformer bushing, so as to solve the problem of poor anti-seismic performance of the transformer bushing in the prior art, which is prone to be damaged by earthquakes.

[0008] The present application is implemented by the following technical solutions: A process for improving the anti-seismic performance of a transformer bushing, the process comprising the following steps: removing the spring buckles one by one and cleaning the first annular cavity; sealing the gap between the flange and the spring buckles; injecting organic grouting material into the first annular cavity in at least two ways and filling the first annular cavity; after the organic grouting material hardens, a first anti-seismic layer is obtained.

[0009] Optionally, after cleaning the first annular cavity and before injecting the organic grouting material, a silane coupling agent is applied to the inner wall of the first annular cavity.

[0010] Optionally, when injecting the organic grouting material, the organic grouting material is injected in a circumferential direction around the porcelain bushing.

[0011] Optionally, the interval time for each injection of the organic grouting material is at least 10 minutes.

[0012] Optionally, the liquid level of the organic grouting material is flush with the top surface of the spring buckles.

[0013] Optionally, the organic grouting material is an epoxy grouting material, and the preparation method of the epoxy grouting material is: preparing resin base and curing agent with a mass ratio of 2-3:1; slowly adding the curing agent to the resin base and rapidly mixing to obtain the epoxy grouting material.

[0014] Optionally, after the organic grouting material hardens, the process comprises the following steps: installing a forming template around the flange to obtain a second annular cavity; sealing the gap between the forming template and the porcelain bushing; injecting inorganic grouting material into the second annular cavity; after the inorganic grouting material hardens, a second anti-seismic layer is obtained.

[0015] Optionally, the inorganic grouting material is injected into the second annular cavity in at least two ways, wherein the first injection amount accounts for 5-10% of the second annular cavity, and after standing for 10 minutes, the second annular cavity is filled with inorganic grouting material.

[0016] Optionally, after the inorganic grouting material is hardened, a corrosion-resistant layer, a weather-resistant layer and a wear-resistant layer are sequentially coated on the surface of the forming mold, wherein the thickness of the corrosion-resistant layer is 50-80 mu m, the thickness of the weather-resistant layer is 80-100 mu m, and the thickness of the wear-resistant layer is 30-50 mu m. The corrosion-resistant layer is an epoxy zinc yellow primer layer, the weather-resistant layer is a polyurethane coating layer, and the wear-resistant layer is a fluorocarbon finish layer.

[0017] Optionally, the inorganic grouting material is a cement grouting material, and a preparation method of the cement grouting material is as follows: The fast-hardening cement grouting material is prepared by mixing fast-hardening cement grouting and water in a mass ratio of 1.5-5:1. A fiber additive is added. A water reducing agent is added. An expanding agent is added to obtain the cement grouting material, wherein the cement grouting material has a compressive strength of greater than or equal to 40 MPa after being hardened.

[0018] Optionally, the fiber additive is one or more of polypropylene fiber, PVA fiber, glass fiber and carbon fiber. And / or, the water reducing agent is a polycarboxylic acid type water reducing agent, a naphthalene type water reducing agent or a melamine type water reducing agent. And / or, the expanding agent is a calcium sulphoaluminate type expanding agent, a magnesium oxide expanding agent or a calcium oxide expanding agent.

[0019] Compared with the prior art, the present application has the following advantages and beneficial effects: By pouring the organic grouting material into the first ring cavity, the organic grouting material has good flowability in the pouring process due to the characteristics of strong adhesion and good permeability, and can flow and adaptively fill the first ring cavity. After the grouting is completed, the first anti-seismic layer with certain strength and adhesion is obtained after curing. The hardened epoxy resin grouting material not only can seal the pores between the porcelain sleeve and the flange, but also can play a good restraining effect on each part, thereby solving the problem of insufficient restraint caused by the easy loosening of the buckle type sleeve under the action of an earthquake. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the example embodiments of the present application, the following will briefly introduce the drawings needed to be used in the examples. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings: Figure 1The structural schematic diagram of the transformer with the buckle type sleeve pipe provided by the present application (prepared by the process method for improving the anti-seismic performance of the transformer sleeve pipe); Figure 2 The structural schematic diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application, part of the structure of the transformer body and the sleeve pipe is removed for showing the structure; Figure 3 The structural schematic diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application, part of the structure of the transformer body and the sleeve pipe is removed for showing the structure; Figure 2 The sectional structural schematic diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application in an embodiment; Figure 4 The structural schematic diagram of the forming template of the transformer sleeve pipe with the anti-seismic structure provided by the present application; Figure 5 The structural schematic diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application in an embodiment, the forming template is removed for showing the structure; Figure 6 The structural schematic diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application, part of the structure of the transformer body and the sleeve pipe is removed for showing the structure; Figure 5 The sectional structural schematic diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application in an embodiment; Figure 7 The structural schematic diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application, the flange is removed for showing the structure; Figure 8 The installation structural schematic diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application; Figure 9 The sectional structural schematic diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application; Figure 10 The partial structural schematic diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application; Figure 11 The structural schematic diagram of the spring buckle and the first fastener in the transformer sleeve pipe with the anti-seismic structure provided by the present application; Figure 12 The installation structural schematic diagram of the second detection module in the transformer sleeve pipe with the anti-seismic structure provided by the present application; Figure 13 The load-displacement curve diagram of the transformer sleeve pipe with the anti-seismic structure provided by the present application in the anti-seismic performance test, wherein the black solid line represents the transformer sleeve pipe with the anti-seismic structure without grouting, the blue dot-dashed line represents the transformer sleeve pipe with the anti-seismic structure with one-time grouting (organic grouting material), and the red dashed line represents the transformer sleeve pipe with the anti-seismic structure with two-time grouting (organic grouting material + inorganic grouting material).

[0021] Markings and corresponding component names in the accompanying drawings: 11-tension measurement point, 12-displacement measurement point, 13-temperature measurement point, 14-stress measurement point, 21-transformer body, 22-bushing body, 221-porcelain sleeve, 201-filling gap, 3-flange, 41-first fastener, 42-second fastener, 5-spring clip, 61-first annular cavity, 62-second annular cavity, 7-forming template, 71-grouting hole, 72-mounting plate, 73-avoidance, 8-gasket, 9-stiffening rib, 101-strain type three-axis force sensor, 102-vibration sensor, 103-ultrasonic sensor, 1031-transmitter / receiver, 1032-circuit board, 110-base. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0023] According to a first aspect of the present disclosure, a process for improving the seismic resistance of transformer bushings is provided, the purpose of which is to reinforce the snap-on bushings that have been put into operation, thereby improving the seismic resistance of the snap-on bushings. Figure 13 The experimental data are shown.

[0024] The process comprises the following steps: Remove the spring buckles 5 one by one and clean the first ring cavity 61; The gap between the sealing flange 3 and the spring buckle 5; Pour the organic grouting material into the first annular cavity 61 at least twice to fill the first annular cavity 61; After the organic grouting material hardens, the first earthquake-resistant layer is obtained.

[0025] See Figures 1 to 12 As shown, the snap-on bushing includes a bushing body 22, a spring clip 5, and a first fastener 41. The spring clip 5 and the first fastener 41 are arranged in multiple corresponding groups. The porcelain sleeve 221 of the bushing body 22 is connected to the transformer body 21 via the flange 3. The porcelain sleeve 221 is formed with an annular shoulder that mates with the spring clip 5, and a first spacing is provided between the porcelain sleeve 221 and the inner wall of the flange 3. Due to this first spacing, the area between the porcelain sleeve 221, the flange 3, and the spring clip 5 collectively forms a first annular cavity 61. A grouting gap 201 for injecting organic grouting material is provided between the porcelain sleeve 221 and the spring clip 5. Multiple groups of spring clips 5 are evenly distributed along the circumference of the porcelain sleeve 221, each spring clip 5 pressing against the annular shoulder and fixedly connected to the flange 3 via the first fastener 41.

[0026] The first annular cavity 61 is filled with organic grouting material. The organic grouting material has the characteristics of strong adhesion and good permeability, and has good fluidity during grouting, so that the first annular cavity 61 can be filled adaptively. After grouting, the first anti-seismic layer with certain strength and adhesion is obtained. The hardened epoxy resin grouting material not only can seal the pores between the porcelain sleeve 221 and the flange 3, but also can constrain the parts well, thereby solving the problem of insufficient constraint caused by the loosening of the buckle type sleeve under the action of earthquake in the prior art.

[0027] It should be noted that before the spring buckles 5 are removed one by one, a detection device needs to be arranged on the sleeve body 22, and the internal space of the spring buckles 5 needs to be cleaned one by one to keep a good cleaning state, which is conducive to better combination of the organic grouting material. Referring to Figure 1 As shown in the figure, the displacement of the top position 1 of the sleeve body 22 and the inclination angle of the sleeve body 22 are measured by using a laser displacement sensor, and the initial position of the sleeve body 22 is taken as the control target value. The sleeve body 22 initially has a certain inclination angle, and the inclination angle and the vertical angle are 3° (the inclination angle is the installation parameter of the equipment itself). Stress sensors and temperature sensors are arranged at the root of the porcelain sleeve 221 and the inner wall of the flange 3, and a tension sensor is arranged at the top of the sleeve body 22, so as to measure the initial tension of the conductor on the top of the sleeve body 22. After the detection device is arranged, all kinds of sensors and detectors are always in working state during construction, and the data acquisition frequency is 10 times per second. During each construction step, for example, during the operation of removing the spring buckles 5, injecting the organic grouting material / inorganic grouting material, and installing the forming template 7, the disturbance to the sleeve body 22 should be minimized, so as to ensure that the strain and displacement response of the key parts of the sleeve body 22 always fluctuate within 10%.

[0028] After the comprehensive monitoring system is arranged, referring to Figure 5 and Figure 6 As shown in the figure, the pre-tightening force of all first fasteners 41 (such as bolts below) for fixing the spring buckles 5 is increased by at least 50%, and then the spring buckles 5 and the bolts are removed in sequence. Only one spring buckle 5 can be removed at the same time each time, so as to ensure the stability of the sleeve during construction.

[0029] After the spring buckle 5 is removed, a powerful dust suction device (existing equipment, not shown in the drawings) is used to perform the first dust removal work on the first annular cavity 61 formed by the porcelain sleeve 221 and the inner wall of the flange 3. After the first dust removal work is completed, a second more detailed dust removal work is performed using a sticky cloth. After the cleaning work is completed, the construction personnel can apply a silane coupling agent to the inner surface of the inner wall of the flange 3 and the root of the porcelain sleeve 221. This can enhance the bonding strength of the epoxy resin grouting material to the inner wall of the flange 3 and the porcelain sleeve 221, thereby enhancing the restraining effect of the grouting material on the spring buckle 5 and the first fastener 41 (bolt) and other key components of the sleeve body 22. It should be noted that after the spring buckle 5 and the bolt are installed, the next spring buckle 5 can be sequentially removed, and the above cleaning process is repeated.

[0030] The organic grouting material has very high fluidity and can easily flow into the tiny pores in the cavity. After grouting, the grouting material has high density. Therefore, it is necessary to ensure that the first annular cavity 61 maintains good sealing, thereby reducing the generation of pores and cavities.

[0031] In the present disclosure, insulating mastic (existing technology) is used to seal the gap between the flange 3 and the spring buckle 5. After the insulating mastic hardens, a differential pressure detection method is used to detect the air tightness of the first annular cavity 61. When detecting the air tightness of the flange 3 cavity, all the pores of the flange 3 in contact with other components are blocked, only one air inlet and one pressure detection port are left, then dry compressed air is filled into the first annular cavity 61 through the air inlet, the test pressure is set to 0.2 MPa, and it is stabilized for a period of time. Then use a pressure gauge or pressure sensor to record the initial pressure, and stand for a period of time. If the pressure does not decrease significantly, for example, the decrease is ≤5%, it indicates that the flange 3 cavity is well sealed; if the pressure decreases rapidly, there may be a leak, which can be further located accurately using an ultrasonic leak detector.

[0032] The selected insulating sealing mastic should have the characteristics of strong plasticity, fast hardening, high hardening strength, slight expansion during hardening, high viscosity, corrosion resistance, and good stability. This is conducive to shortening the construction period of the transformer sleeve with anti-seismic structure, thereby reducing the economic losses caused by long-term equipment downtime. The insulating sealing mastic needs to be in contact with both the epoxy resin grouting material and the cement grouting material, so it should have good stability to prevent the sealing mastic from chemically reacting with the two grouting materials, thereby ensuring the overall anti-seismic performance of the buckle type sleeve.

[0033] After the organic grouting material hardens, a non-destructive testing device can be used to detect the density and compressive strength of the first anti-seismic layer.

[0034] The mixed epoxy resin grouting material is injected into the cavity area 10 along the grouting hole 71 in at least two batches using a high-pressure grouting pump with stable pressure output and precise flow control, and the interval between different batches is ten minutes to ensure that the grouting material can be fully cooled after being injected. In the later stage of grouting, the inflow efficiency of the epoxy resin grouting material will be appropriately reduced, at which time the grouting speed should be reduced. After the epoxy resin grouting material is grouted, it should be cured for more than 24 hours, and a non-destructive testing device is used to detect the grouting density and the strength of the hardened material.

[0035] It should be noted that the compressive strength of the first anti-seismic layer is ≥40Mpa. After the organic grouting material is hardened, it not only seals the pores between the porcelain sleeve 221 and the flange 3, but also effectively restrains the components, effectively solving the problem of insufficient restraint caused by the easy loosening of the buckle type sleeve spring buckle 5 under an earthquake.

[0036] Further, before the first annular cavity 61 is cleaned and the organic grouting material is grouted, a silane coupling agent is applied to the inner wall of the first annular cavity 61. That is, the silane coupling agent is applied to the inner wall of the flange 3 and the outer wall of the porcelain sleeve 221, which can enhance the bonding strength of the epoxy resin grouting material with the inner walls of the porcelain sleeve 221 and the flange 3, thereby enhancing the restraining effect of the grouting material on the spring buckle 5 and the bolts of the sleeve body 22 and other key components.

[0037] In order to make the organic grouting material uniformly distributed, the organic grouting material can be injected along the circumferential direction of the porcelain sleeve 221 during the grouting process.

[0038] Specifically, after aligning the grouting equipment with the gap, the grouting equipment is uniformly injected along the gap between the porcelain sleeve 221 and the spring buckle 5, and a circumferential grouting method is used to rotate the grouting according to the flow rate of the epoxy resin grouting material. The circumferential grouting method is to move along the circumferential direction of the porcelain sleeve 221, so that the organic grouting material can be uniformly injected into the grouting area.

[0039] In the present disclosure, the interval between each grouting of the organic grouting material is at least 10 minutes, which can ensure that the grouting material can be fully cooled after being injected, which is beneficial to reduce the generation of defects such as pores in the organic grouting material, thereby improving the compressive strength of the hardened first anti-seismic layer and reducing the stress concentration.

[0040] In this process, when the grouting is completed, the liquid level of the organic grouting material is flush with the top surface of the spring buckle 5, which is close to an overflow state. In this way, the organic grouting material can be in full contact with the porcelain sleeve 221, the flange 3 and the spring buckle 5, the contact area between the components can be increased, the overall bonding strength of the sleeve body 22 can be ensured, and the anti-seismic ability can be improved.

[0041] In the present disclosure, the organic grouting material is an epoxy grouting material, and the epoxy grouting material is prepared by the following preparation method: the resin base and the curing agent are prepared in a mass ratio of 2-3:1; the curing agent is slowly added to the resin base and rapidly mixed to obtain the epoxy grouting material. When mixing, the curing agent is slowly added to the resin base, and the two are mixed uniformly using a super-speed mixer.

[0042] It should be noted that the components of the epoxy grouting material need to be adjusted adaptively according to the temperature of the construction environment and the required grouting amount. When the temperature is higher or the grouting amount is larger, the proportion of the curing agent should be reduced to slow down the hardening speed of the epoxy grouting material, so as to leave sufficient grouting time and prevent the epoxy grouting material from hardening in advance, thereby ensuring the bonding strength of the epoxy grouting material with the flange 3, the porcelain sleeve 221 and the spring buckle 5, and improving the anti-seismic performance of the transformer bushing.

[0043] After the organic grouting material is hardened, the process method comprises the following steps: A forming template 7 is installed on the outer periphery of the flange 3, and the forming template 7 completely covers the first annular cavity 61 of the flange 3; The forming template 7 and the outer wall of the flange 3 are provided with a second spacing to form a second annular cavity 62; The gap between the sealing forming template 7 and the porcelain sleeve 221 is sealed; The inorganic grouting material is grouted in the second annular cavity 62; After the inorganic grouting material is hardened, a second anti-seismic layer is obtained.

[0044] The forming template 7 made of a low magnetic permeability metal material (aluminum alloy material is selected in the present disclosure, and the low magnetic permeability refers to a magnetic permeability close to 1) has high strength. In the present disclosure, in order to ensure safety in use, the forming template 7 needs to be insulated. Specifically, the forming template 7 is subjected to an anodizing treatment to form an insulating layer with a thickness of 80 μm or more on the surface. At the same time, a polyurethane insulating coating layer with a thickness of 100-150 μm is sprayed on the surface.

[0045] The forming template 7 is pre-provided with a grouting hole 71 for grouting. The grouting hole 71 is located at the upper top surface of the forming template 7, and the hole shape of the grouting hole 71 is a sector shape with an arc-shaped edge. In addition, the grouting hole 71 is located on the outside of the forming template 7, and at the same time, based on the shape design of the forming template 7, the grouting hole 71 is also located on the outside of the porcelain sleeve 221, so that the grouting hole 71 is fully exposed, which is beneficial to the uniform flow and filling of the inorganic grouting material in the pores of the second annular cavity 62.

[0046] The contact surface of the forming template 7 needs to be softened when installed. Specifically, a 2-5mm thick U-shaped silica gel edge protector is installed on the contact part of the top surface of the template and the porcelain sleeve 221, so as to avoid damage to the porcelain sleeve 221. The distance between the top surface of the upper end of the annular shoulder of the sleeve body 22 and the bottom surface of the grouting template is greater than 15mm, leaving sufficient space for grouting and installation. The bottom surface of the grouting template is in contact with the bottom surface of the flange 3.

[0047] The fan-shaped forming template 7 is provided in at least four pieces, and the fan-shaped forming templates 7 are connected by the second fastener 42 (i.e., the second bolt). The bolts on the mounting plates 72 of adjacent grouting templates are tightened to ensure that the plurality of fan-shaped forming templates 7 are tightly fitted together to form a cylindrical or cylindrical-like member. Thereafter, the gap between the forming template 7 and the porcelain sleeve 221 is sealed with insulating sealant.

[0048] After the sealant hardens, the inorganic grouting material is injected into the second annular cavity 62. After the secondary grouting is completed, the inorganic grouting material in the second annular cavity 62 serves as a new force-bearing member and can protect the flange 3, thereby improving the seismic performance of the flange 3.

[0049] The forming template 7, as part of the seismic structure, is not removed but permanently fixed to the sleeve body 22. This not only reduces the construction steps of removing the template and saves construction time, but also restrains and protects the second seismic layer, enhances the stress performance of the second seismic layer, avoids the erosion of the second seismic layer by the external environment, and further improves the seismic performance and service life of the transformer sleeve with the seismic structure.

[0050] In this process, the inorganic grouting material is injected into the second annular cavity 62 in at least two times. Specifically, the first grouting amount is 5-10% of the second annular cavity 62, and after standing for 10 minutes, the second annular cavity 62 is filled with inorganic grouting material until the second annular cavity 62 is completely filled as observed through the grouting hole 71. The split injection not only allows the sealing effect of the sealant to be detected, but also allows the inorganic grouting material itself to better seal the forming template 7 and the flange 3. After the inorganic grouting material is injected, the second seismic layer formed can form a new force-bearing member, thereby providing better seismic capacity to the transformer sleeve with the seismic structure.

[0051] After the inorganic grouting material is hardened, a corrosion-resistant layer, a weather-resistant layer and a wear-resistant layer are sequentially coated on the surface of the forming mold plate 7, wherein the thickness of the corrosion-resistant layer is 50-80 μm; the thickness of the weather-resistant layer is 80-100 μm; and the thickness of the wear-resistant layer is 30-50 μm. In this way, a multi-layer composite protective layer can be formed, the influence of the external environment on the buckle type sleeve can be reduced, the transformer sleeve with the anti-seismic structure can maintain stable performance in the field working environment, and long-term, stable and reliable anti-seismic effect can be provided.

[0052] In the present disclosure, the corrosion-resistant layer is an epoxy zinc yellow primer layer, the weather-resistant layer is a polyurethane coating layer, and the wear-resistant layer is a fluorocarbon topcoat layer.

[0053] Specifically, the primer layer is an epoxy zinc yellow primer layer with a thickness of 50-80 μm, which can prevent the penetration of alkaline substances in the inorganic grouting material to the surface of the forming mold plate 7 and avoid chemical corrosion. The intermediate layer is a weather-resistant and anti-ultraviolet layer, which is a polyurethane coating layer with a thickness of 80-100 μm, which can effectively resist degradation by sunlight ultraviolet rays and prevent the coating from chalking and discoloring. The surface layer is a wear-resistant and hydrophobic layer, which is a fluorocarbon topcoat layer with a thickness of 30-50 μm, which can effectively reduce the adhesion of rainwater and dust, thereby reducing the maintenance frequency and cost.

[0054] In the present disclosure, the inorganic grouting material is a cement grouting material, and the preparation method of the cement grouting material is as follows: The fast-hardening cement grouting material is mixed with water at a mass ratio of 1.5-5:1; A fiber additive is added; A water reducing agent is added; An expansive agent is added to obtain the cement grouting material, wherein the compressive strength of the cement grouting material after hardening is ≥40 MPa.

[0055] The fast-hardening cement grouting material is mixed with water in a certain proportion, which is beneficial to ensure that the fast-hardening cement grouting material can reach 80% of the design strength (compressive strength ≥40 MPa) within 48 h. During the mixing process, a fiber additive is added to enhance the tensile performance and flexibility; a water reducing agent is added to enhance the flowability and compactness after grouting; and an expansive agent is added to compensate for the shrinkage effect (shrinkage rate of 0.1%-0.3%) during the hardening process of the cement grouting material.

[0056] In this way, the flexural strength of the second anti-seismic layer can be improved by fiber reinforcement, and the fiber bridging effect changes the failure mode from brittle fracture to ductile cracking, which is suitable for repeated seismic loads. The addition of the water reducing agent can improve the flowability and ensure that the second annular cavity 62 is filled without dead angles. The expansive agent offsets the shrinkage of the cement during hardening, avoiding the debonding of the contact surface between the flange 3 and the forming mold plate 7. The cement grouting material is modified by fiber toughening, water-reducing flow and expansion shrinkage resistance, which improves the comprehensive performance of the second anti-seismic layer.

[0057] Optionally, the fiber-added admixture is one or more of polypropylene fiber, PVA fiber, glass fiber and carbon fiber.

[0058] Optionally, the water reducer is a polycarboxylic acid water reducer, a naphthalene water reducer or a melamine water reducer; Optionally, the expansion agent is a calcium sulfoaluminate expansion agent, a magnesium oxide expansion agent or a calcium oxide expansion agent.

[0059] It should be noted that the phrase "and / or" appears in the text and refers to A and / or B, which is intended to indicate that there are three possible solutions: only solution A, only solution B, and both solutions A and B. The phrase " / and" appears in the text and refers to A / and B, which is intended to indicate that there are two possible solutions: only solution A and both solutions A and B.

[0060] It can be observed from the load-displacement curve drawn from the seismic performance test that Figure 13 As shown, the seismic performance of the snap-on casing improved after primary grouting compared to before. The overall stiffness of the casing was significantly increased (by over 70%) after both primary and secondary grouting. No significant stiffness degradation was observed before casing failure after either primary or secondary grouting. Furthermore, the stress distribution at the casing flange joint was more uniform after both primary and secondary grouting, with the bearing capacity significantly improved after secondary grouting compared to primary grouting.

[0061] According to a second aspect of the present disclosure, a transformer bushing with a seismic-resistant structure is provided, wherein: Figures 1 to 12 A specific embodiment thereof is shown.

[0062] It should be noted that directional terms such as "inside" and "outside" refer to the "inside" and "outside" relative to the casing. The direction facing the casing axis is "inside," and the direction facing the casing axis is "outside." Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not imply order or importance. Furthermore, in the following description of the drawings, the same reference numerals in different drawings represent the same element.

[0063] In an embodiment provided by the present disclosure, the seismic-resistant structure is prepared by using the process method for improving the seismic resistance of the transformer bushing according to the first aspect.

[0064] In one embodiment, the buckle type bushing comprises a bushing body 22, spring buckles 5 and first fasteners 41, which are arranged in multiple groups; wherein the porcelain sleeve 221 of the bushing body 22 is connected to the transformer body 21 through the flange 3, the annular shoulder on the porcelain sleeve 221 is matched with the spring buckle 5, and the first interval is arranged between the porcelain sleeve 221 and the inner wall of the flange 3 to form the first annular cavity 61; the pouring gap 201 for pouring the organic grouting material is arranged between the porcelain sleeve 221 and the spring buckle 5, so that the organic grouting material can form the first anti-seismic layer after hardening and be bonded to the flange 3, the spring buckle 5 and the porcelain sleeve 221; the multiple groups of spring buckles 5 are uniformly arranged along the circumferential direction of the first annular cavity 61, which can avoid local stress concentration and cracking of the porcelain sleeve 221. Each spring buckle 5 is pressed against the annular shoulder and fixedly connected to the flange 3 through the first fastener 41.

[0065] The buckle type bushing can improve the anti-seismic performance of the bushing body 22 and the transformer body 21 through the dual effects of mechanical fixation of the spring buckle 5 and adhesion and reinforcement of the organic grouting material. The annular shoulder on the porcelain sleeve 221 is matched with the spring buckle 5, and multiple groups of buckles are uniformly distributed along the circumference to form radial restraint and prevent the lateral displacement of the bushing body 22 in vibration. The spring buckle 5 is fixed on the flange 3 through the first fastener 41 (such as a first bolt), which can improve the strength of the first anti-seismic layer and resist the axial pulling force.

[0066] The organic grouting material (such as epoxy resin or polyurethane) is injected into the first annular cavity 61 between the porcelain sleeve 221 and the flange 3 through the pouring gap 201, and fills the gap between the spring buckle 5 and the porcelain sleeve 221 and the flange 3. After the organic grouting material hardens, the first anti-seismic layer is formed in the annular cavity, bonding the porcelain sleeve 221, the spring buckle 5 and the flange 3 as a whole, which can absorb the elastic deformation through the first anti-seismic layer caused by vibration and make up for the friction loss between the mechanical buckle and the porcelain sleeve 221. In this way, the spring buckle 5 provides rigid restraint, and the grouting layer provides elastic cushioning, which cooperatively resists the multi-directional stress caused by earthquakes or mechanical vibration. The structure cooperatively designed through mechanical buckling and grouting adhesion and reinforcement significantly improves the stability and durability of the bushing body 22 under dynamic load, and is extremely suitable for earthquake-prone areas or high-vibration environments (such as rail transit and power hubs).

[0067] To improve the effect of the buckle type sleeve, the anti-seismic structure further comprises at least four forming templates 7. Specifically, the forming templates 7 are arranged on the outer periphery of the flange 3 and are sequentially connected by the second fasteners 42, so as to be completely wrapped in the first annular cavity 61 of the flange 3. Thus, the forming templates 7 become molds for pouring the inorganic grouting material, so that the grouting layer is uniformly formed. The outer wall of the flange 3 is provided with a second spacing with the forming templates 7, so as to form a second annular cavity 62; the forming templates 7 are provided with grouting holes 71 for pouring the inorganic grouting material, so that the inorganic grouting material can be formed into a second anti-seismic layer after hardening, which is bonded to the flange 3, the forming templates 7 and the porcelain sleeve 221.

[0068] Through the above technical solution, the organic grouting material (inner layer) is poured first to ensure the interface bonding; then the forming templates 7 are installed and the inorganic grouting material (outer layer) is poured to form a composite protection. Based on the first anti-seismic layer (organic grouting material) absorbing high-frequency vibration energy, the brittle porcelain sleeve 221 can be prevented from cracking; the second anti-seismic layer (inorganic grouting material) can provide high-rigidity support to resist low-frequency large-displacement vibration (such as seismic transverse wave).

[0069] Through the double-layer rigidity gradient design of the first anti-seismic layer and the second anti-seismic layer, resonance of a single material with a seismic wave frequency band is avoided. The vibration energy is partially dissipated through the first anti-seismic layer (organic grouting layer) when transmitted to the porcelain sleeve 221; the remaining energy is further dispersed through the second anti-seismic layer (inorganic grouting layer) when transmitted to the forming templates 7.

[0070] The inorganic grouting layer covers the outer periphery of the flange 3, avoiding fatigue cracks around the bolt holes of the flange 3 due to vibration. The inorganic grouting material (such as cement-based) is resistant to high temperature, making up for the deficiency of the organic grouting material. Referring to Figure 13 As shown, compared with the buckle type sleeve before improvement, the buckle type sleeve obtained under the technical concept of the present disclosure has better anti-seismic performance.

[0071] Further, the grouting holes 71 are located close to the outer edges of the forming templates 7. The grouting holes 71 are located at the outer edges, so that the grout flows from the outside to the inside (flange 3 direction), avoiding material accumulation or blockage due to long-distance pouring, thereby shortening the flow path and reducing the risk of stratification or segregation. Air can naturally escape to a high place (inside), reducing bubble residue and improving the compactness of the grouting layer. In addition, the grouting holes 71 are exposed, which is also convenient for observing the overflow of the grout and judging whether the filling is completed.

[0072] In the present disclosure, the flange 3 comprises a large-diameter section, a small-diameter section and a base connected in sequence, wherein the diameter of the base is larger than that of the large-diameter section, and the diameter of the large-diameter section is larger than that of the small-diameter section; the buckle type sleeve further comprises a plurality of stiffening ribs 9, which are uniformly spaced along the circumferential direction of the small-diameter section and are fixedly connected to the large-diameter section, the small-diameter section and the base, thereby providing better support to the large-diameter section and improving the overall strength of the flange 3; the forming template is provided with a clearance 73 adapted to the stiffening ribs 9.

[0073] Further, the two sides of the clearance 73 are chamfered, that is, the two sides of the clearance are chamfered, which is beneficial to prevent the forming template 7 from being affected by the weld during installation.

[0074] The bottom of the forming template 7 and the stiffening ribs 9 are both treated with holes, so that the sleeve body 22 can be normally disassembled and maintained.

[0075] In the present disclosure, the forming template 7 is provided as at least four, so as to avoid interference during the folding process of the stiffening ribs 9, thereby ensuring that the assembly work of the buckle type sleeve can be smoothly carried out.

[0076] In a preferred embodiment provided in the present disclosure, the outer wall of the porcelain sleeve 221 and the inner wall of the flange 3 are both coated with a silane coupling agent, which can enhance the bonding strength of the epoxy resin grouting material to the porcelain sleeve 221 and the inner wall of the flange 3, thereby enhancing the restraint of the grouting material on the sleeve body 22, the spring buckle 5 and the bolt and other key components.

[0077] In the present disclosure, a gasket 8 is provided between the spring buckle 5 and the annular shaft shoulder. The gasket 8 can form a fixed gap between the spring buckle 5 and the shaft shoulder, which not only prevents the buckle from directly pressing the porcelain sleeve 221 and causing damage to the porcelain sleeve 221, but also allows the organic grouting material (such as epoxy resin) to fully flow into the injection gap and fully fill each area in the first annular cavity. The gasket 8 can homogenize the pressure of the buckle on the shaft shoulder, avoiding the situation that local blockage leads to incomplete grouting.

[0078] In the present disclosure, the contact surface between the annular shaft shoulder and the gasket 8 is formed as a first inclined surface, and the contact surface between the spring buckle 5 and the gasket 8 is formed as a second inclined surface. The wedge effect of the inclined surfaces can convert part of the axial vibration into radial pressing force, inhibit the loosening of the spring buckle 5, and is beneficial to avoid stress concentration at the edge of the porcelain sleeve 221, and is suitable for scenes with extremely high requirements for anti-seismic reliability, such as extra-high voltage transformers and nuclear power sleeve bodies 22.

[0079] Further, the gasket 8 is an aluminum sheet. Based on the material properties of the aluminum sheet, part of the high-frequency vibration energy can be absorbed, the fretting wear loss between the buckle and the porcelain sleeve 221 is reduced, and the service life is prolonged.

[0080] In other embodiments, the aluminum sheet can also be provided as a polytetrafluoroethylene gasket 8.

[0081] In a preferred embodiment provided by the present disclosure, the outer surface of the forming template 7 is sequentially plated with a corrosion-resistant layer, a weather-resistant layer and a wear-resistant layer in an inside-out direction, thereby forming a multi-layer composite protective layer, which can reduce the influence of the external environment on the buckle type sleeve, maintain the stable performance of the transformer sleeve with the anti-seismic structure in the field working environment, and provide long-term, stable and reliable anti-seismic performance.

[0082] Alternatively, the corrosion-resistant layer is an epoxy zinc yellow primer layer, the weather-resistant layer is a polyurethane coating layer, and the wear-resistant layer is a fluorocarbon topcoat layer. Zinc yellow pigment (Cr 6+ ) forms a passivation film in the epoxy resin, reduces the corrosion rate, and forms a better protective effect with the polyurethane layer. The elastic deformation of the polyurethane layer can buffer external force. The fluorocarbon topcoat layer can improve the anti-aging effect.

[0083] Alternatively, the thickness of the corrosion-resistant layer is 50-80 μm; the thickness of the weather-resistant layer is 80-100 μm; and the thickness of the wear-resistant layer is 30-50 μm.

[0084] In an embodiment provided by the present disclosure, the organic grouting material is any one of epoxy resin, polyurethane, acrylate, methyl methacrylate, polyester resin and organosilicon. It should be noted that the above-mentioned materials are all prior art materials.

[0085] In an embodiment provided by the present disclosure, the inorganic grouting material is a cement-based or cement-sodium silicate double-liquid slurry in the prior art.

[0086] In the present disclosure, referring to Figures 1 to 12 , the buckle type sleeve further comprises a first detection module and a second detection module, both of which are in communication with the controller, and the controller is in communication with the terminal; wherein the first detection module is used to detect the current position information of the sleeve, the current tension information of the sleeve and the current temperature information of the organic grouting material; the second detection module is used to detect the pore information of the first anti-seismic layer, the stress information of the first fastener under vibration and the frequency spectrum signal of the first fastener under vibration. In this way, through the first detection module, the construction process data can be monitored, so that the construction personnel can adjust the process method and process data according to the detection results, thereby ensuring the construction quality.

[0087] Specifically, the first detection module comprises a displacement sensor, a tension sensor and a temperature sensor, wherein the tension sensor is arranged at the top of the sleeve body and used to measure the current tension information between the conductor and the sleeve; the displacement sensor is arranged at the porcelain sleeve of the sleeve or the top of the sleeve and used to measure the current displacement information of the sleeve; and the temperature sensor is arranged on the porcelain sleeve and used to measure the current temperature information of the organic grouting material. The controller is communicatively connected to the terminal, so that the current tension information, the current displacement information and the current temperature information obtained can be transmitted to the terminal.

[0088] Referring to Figure 1 the measurement points shown, by using the detection device to monitor the displacement information, tension information and temperature information of the sleeve body 22 in real time, the whole-process accurate measurement and control of the state of the sleeve body 22 are realized, so that the construction personnel can adjust the process method according to the detection results, optimize the process data, improve the construction efficiency and construction quality, and ensure the overall anti-seismic ability of the buckle type sleeve.

[0089] Further, referring to Figures 7 to 12 the second detection module comprises a strain type three-way force sensor 101, a vibration sensor 102 and an ultrasonic sensor 103, wherein the outer periphery of the first fastener 41 is attached with a base 110, and the contact surface of the base 110 and the first fastener 41 is an arc surface, wherein the strain type three-way force sensor 101 is arranged on the arc surface so as to be tightly attached to the first fastener 41; the ultrasonic sensor 103 comprises a transmitter, a receiver and a circuit board 1032, wherein the circuit board 1032 is arranged on the base 110, the transmitter and the receiver (collectively referred to as a transmitter / receiver 1031) are arranged in two groups and are arranged on the circuit board 1032 in a spaced manner; the transmitter and the receiver are arranged on the outer periphery of the first fastener 41; and the strain type three-way force sensor 101 is connected to the base 110 and attached to the outer periphery of the first fastener 41. Specifically, the transmitter and the receiver are integrally arranged.

[0090] The arc surface structure of the base 110 can facilitate quick positioning and assembly of the base 110 and the first fastener 41, and meanwhile, the arc surface design can increase the contact area and ensure the tight attachment, thereby ensuring the stability of the detection process of the strain type three-way force sensor 101, the vibration sensor 102 and the ultrasonic sensor 103 and the accuracy of the detection results. In addition, the three sensors (the three-way force sensor, the vibration sensor 102 and the ultrasonic sensor 103) are all installed outside the base 110, and such integrated modular design can facilitate the construction personnel to install them one by one on the first fastener 41, which is conducive to improving the assembly efficiency.

[0091] Referring to the accompanying Figure 12As shown, the transmitter and the receiver are both arranged on the circuit board 1032, which collects the acoustic wave signals of the internal grouting area during the grouting process and after being put into use through the circular transmitter and receiver, and the controller analyzes whether there is a pore on the first anti-seismic layer according to the collected acoustic wave signals, and further analyzes and judges the pore and delamination defects of the first anti-seismic layer, so as to complete the crack monitoring and evaluation of the overall grouting area. Through the joint action of the ultrasonic sensor 103 and the controller, the density of the epoxy resin-based grouting material during grouting and the density of the internal filling area after being put into use can be monitored. The acoustic wave signals of the internal grouting area during the grouting process and after being put into use are collected through the ultrasonic transmitter / receiver, which can use a network server or a preset algorithm, program (prior art) and other deep learning to identify voids or delamination defects, so as to monitor and evaluate the cracks of the overall grouting area. Through the dynamic monitoring mechanism of the density-durability of the first anti-seismic layer, the ultrasonic tomography technology is used in combination with the material aging prediction model to synchronously evaluate the curing uniformity, interface bonding strength and long-term performance attenuation of the epoxy resin-based grouting body, form a "structure reinforcement-material degradation" two-dimensional closed-loop monitoring network, and make up for the technical blind area of the existing substation detail structure health monitoring.

[0092] The vibration sensor 102 is attached to the base 110 and the first fastener 41 respectively, and monitors the bolt frequency spectrum signal through the vibration change of the first fastener 41 (i.e. the bolt) in the earthquake action, and evaluates the anti-seismic capacity in real time through the signals of the first fastener 41 and the first anti-seismic layer.

[0093] Further, the vibration sensor 102 can be connected to a network server, so as to have the ability of deep learning model (CNN), thereby being able to identify abnormal vibration patterns, so as to evaluate the possible damage of the bolt in the earthquake action, and achieve the effect of real-time monitoring and evaluation.

[0094] The strain type three-way force sensor 101 is attached to the first fastener 41 (the bolt), and monitors the three-way strain change on the surface of the bolt in real time, calculates the internal stress state and pre-tightening force change of the bolt through the preset artificial intelligence algorithm (prior art) in the controller, and monitors and evaluates the change of the bolt in the earthquake action in real time. Thus, the comprehensive anti-seismic capacity of the casing pipe is accurately judged through the second detection module, the process method is adjusted through the tracking of the process data, the process data is optimized, and then the anti-seismic capacity of the casing pipe is improved.

[0095] After the second detection module is arranged, the grouting of the epoxy resin-based grouting material can be carried out. The continuous infiltration of the slurry can realize the sequential pressurization of the first added slurry, thereby effectively promoting the flow and filling effect of the epoxy resin-based grouting material in the cavity. During the grouting process, the second detection module will continuously feedback the grouting density and delamination defect data so that the operator can dynamically adjust the grouting rate. The epoxy resin-based grouting material needs to completely fill the cavity of the spring clip 5 until it reaches the top of the spring clip 5 and the top of the exposed part of the porcelain sleeve 221 of the sleeve, thereby forming a composite structure combining the spring clip 5 and the epoxy resin, so as to maximize the stiffness improvement under the action of earthquakes. After the grouting is completed, a curing period of 4-7 days should be carried out to ensure that the epoxy resin-based grouting material is fully cured.

[0096] By innovatively employing precise pressure-injection technology with epoxy resin-based grouting to structurally reinforce the cavity (first annular cavity 61) of the snap-on bushing, the horizontal stiffness and bending capacity of flange 3 are directly increased. Compared to conventional reinforcement schemes that use elevated blocks to laterally support the transformer and bushing assembly, this method utilizes the snap-on node itself to create a more efficient structural force transmission path, offering the technical advantages of high reinforcement efficiency and significantly improved mechanical properties.

[0097] In view of the fact that there are a large number of snap-on bushings in operation in strong earthquake zones, the intelligent real-time monitoring seismic reinforcement method proposed in the present invention shows outstanding engineering application value. That is, through the dual technical guarantees of dynamic regulation of grouting parameters and online quality monitoring, the horizontal displacement of the bushing under earthquake action can be effectively controlled within the safety threshold, thereby avoiding the leakage of bushing insulating oil caused by the detachment of the snap-on bushing.

[0098] The reinforcement method of the present invention utilizes an artificial intelligence-based sensor system. To address the vulnerability of snap-on bolts to bending failure, a second detection module is deployed at key locations on each first fastener 41 (bolt) within the epoxy resin-based grouting area, enabling multi-parameter monitoring. This second detection module integrates a strain-vibration-acoustic composite sensor array. Using embedded AI algorithms (such as LSTM time series analysis), it analyzes bolt stress states, deformation trends, preload loss, spectral signals, and grouting area defects in real time, achieving a transition from "passive protection" to "damage early warning." This method monitors and evaluates the overall performance of the snap-on during earthquakes in real time. This method not only monitors detailed structural performance, often overlooked in mainstream substations, but also evaluates grouting materials, forming a closed-loop monitoring system for material performance and structural response.

[0099] Based on the double-module structure, the construction process and construction condition of the sleeve can be clear, clear and controllable, and the construction scheme can be adjusted in time. In combination with the sleeve anti-seismic detection result, the transformer with the buckle type sleeve can be better applied to different environments, for example, it can be applied to an ultra-high voltage transformer substation.

[0100] The real-time monitoring module based on the artificial intelligence algorithm (prior art) is arranged in the first ring cavity 61, so that the stress state of the first fastener 41 (bolt) and the spring buckle 5 under the action of the earthquake can be evaluated in real time. The substation can help to evaluate the real-time state of the weak position of the transformer buckle type sleeve, and fill the cavity area (i.e. the first ring cavity 61) of the buckle type flange 3 with epoxy resin-based grouting material to protect the second detection module. The stiffness, strength and anti-seismic performance of the buckle type sleeve are greatly improved. Not only can the buckle type sleeve be artificially intelligent real-time monitoring and evaluation, but also can prevent the buckle type sleeve from being separated under the action of the earthquake to cause insulation oil leakage, thereby playing a safety protection role.

[0101] In the present disclosure, the controller is configured as a central processing unit (CPU).

[0102] In other embodiments, the controller can also be configured as a PLC logic controller. In addition, the controller can also be one of a digital signal processor (DSP), an application specific integrated circuit (ASIC), or a field programmable gate array (FPGA).

[0103] In the present disclosure, the controller is connected to various sensors through a cable. In other embodiments, the controller can also be connected to the sensors through wireless communication modules such as Wi-Fi modules and ZigBee modules. In this regard, those skilled in the art can flexibly configure under the technical concept of the present disclosure.

[0104] The above specific embodiments further detail the purpose, technical solutions and benefits of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A process for improving the seismic performance of transformer bushings, characterized in that: The process comprises the following steps: Remove the spring clips one by one and clean the first ring cavity; The gap between the sealing flange and the spring buckle; pouring the organic grouting material into the first annular cavity at least twice to fill the first annular cavity; After the organic grouting material hardens, the first earthquake-resistant layer is obtained.

2. The process for improving the seismic performance of transformer bushing according to claim 1, characterized in that: After cleaning the first annular cavity and before injecting the organic grouting material, a silane coupling agent is first applied to the inner wall of the first annular cavity.

3. The process for improving the seismic resistance of transformer bushing according to claim 1, characterized in that: When pouring the organic grouting material, the organic grouting material is poured around the circumference of the porcelain sleeve.

4. The process for improving the seismic resistance of transformer bushings according to claim 1, characterized in that: The liquid level of the organic grouting material is flush with the top surface of the spring buckle.

5. The process for improving the seismic resistance of transformer bushing according to claim 1, characterized in that: The organic grouting material is an epoxy resin grouting material, and the preparation method of the epoxy resin grouting material is as follows: Prepare the resin base and curing agent in a mass ratio of 2 to 3:1; The curing agent is slowly added to the resin base and mixed quickly to obtain the epoxy resin grout.

6. The process for improving the seismic resistance of transformer bushings according to any one of claims 1 to 5, characterized in that: After the organic grouting material has hardened, the process comprises the following steps: Install a forming template on the outer periphery of the flange to obtain a second annular cavity; Seal the gap between the molding template and the porcelain sleeve; pouring the inorganic grouting material into the second annular cavity; After the inorganic grouting material hardens, the second earthquake-resistant layer is obtained.

7. The process for improving the seismic resistance of transformer bushings according to claim 6, characterized in that: Inject the inorganic grouting material into the second annular cavity at least twice, wherein the first grouting volume accounts for 5-10% of the second annular cavity. After standing for 10 minutes, fill the second annular cavity with the inorganic grouting material again.

8. The process for improving the seismic resistance of transformer bushings according to claim 6, characterized in that: After the inorganic grouting material hardens, a corrosion-resistant layer, a weather-resistant layer, and a wear-resistant layer are sequentially coated on the surface of the forming template. The thickness of the corrosion layer is 50 μm to 80 μm; the thickness of the weather-resistant layer is 80 μm to 100 μm; and the thickness of the wear-resistant layer is 30 μm to 50 μm. / And, the corrosion-resistant layer is epoxy zinc yellow primer layer, the weather-resistant layer is polyurethane coating, and the wear-resistant layer is fluorocarbon topcoat layer.

9. The process for improving the seismic resistance of transformer bushings according to claim 6, characterized in that: The inorganic grouting material is cement grouting material, and the preparation method of the cement grouting material is as follows: Prepare and mix the fast-hardening cement grout and water in a mass ratio of 1.5-5:1; Add fiber admixtures; Add water reducer; An expansion agent is added to obtain a cement grouting material, wherein the compressive strength of the cement grouting material after hardening is ≥40MPa.

10. The process for improving the seismic resistance of transformer bushings according to claim 9, characterized in that: The fiber admixture is one or more of polypropylene fiber, PVA fiber, glass fiber and carbon fiber; and / or, the water reducer is a polycarboxylic acid water reducer, a naphthalene water reducer or a melamine water reducer; And / or, the expansion agent is a calcium sulfoaluminate expansion agent, a magnesium oxide expansion agent or a calcium oxide expansion agent.

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