A lightning protection dry-type transformer

Abstract

The utility model relates to transformer technical field discloses a lightning -resistant dry -type transformer, include: transformer main part, first insulating plate, first insulating plate sets up multiple, multiple first insulating plate from front to back in order to set in the top of transformer main part, second insulating plate, second insulating plate sets up multiple. The lightning -resistant dry -type transformer, through the cooperation between each component, effectively weakens the lightning peak, avoids the direct impact of large current to transformer main part, and after the discharge of lightning energy through the above path, the residual overvoltage and small amplitude lightning fluctuation are accurately clamped by the second lightning arrester close to the transformer main body high -voltage bushing, and are introduced into the grounding device again through the conduction assembly, realize secondary discharge, stabilize the invasion voltage in the safe threshold of transformer main body insulation resistance, reduce the risk of winding insulation breakdown, cause short circuit, thereby improve the operation safety of dry -type transformer in mountainous area, coastal and other high thunderstorm area.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to a lightning-protected dry-type transformer. Background Technology

[0002] Dry-type transformers, with their numerous advantages such as being oil-free, fire-retardant, safe to operate, easy to maintain, and low-loss, are widely used in critical power scenarios such as urban power distribution networks, high-rise buildings, rail transit, data centers, and medical facilities. They are the core power supply equipment in civil and industrial power distribution systems. Compared to oil-immersed transformers, dry-type transformers have a compact insulation structure and limited overall sealing, making them relatively vulnerable to lightning overvoltage. In areas with high lightning incidence, such as mountainous regions, coastal areas, and open fields, they are highly susceptible to lightning strikes, which can cause equipment failure and affect the stable operation of the power distribution system.

[0003] Currently, the high-voltage side lightning protection structure of conventional lightning-protected dry-type transformers on the market generally adopts a fixed installation structure with a single-stage surge arrester. This structure uses a single surge arrester to discharge and clamp intruding lightning overvoltages, achieving basic lightning protection. However, this traditional structure has significant technical defects in practical applications: the current carrying capacity and withstand voltage amplitude of the single-stage surge arrester are fixed, which can only be adapted to daily minor lightning strike conditions. When facing complex conditions such as strong lightning, multiple consecutive lightning strikes, and lightning-induced switching overvoltages, the single-stage surge arrester bears too much load and is prone to overload. The residual overvoltage can directly impact the high-voltage winding of the transformer, breaking down the winding insulation and causing short circuits. This structure cannot meet the safe operation requirements of dry-type transformers in complex lightning environments such as mountainous areas and coastal areas.

[0004] In addition, the existing lightning protection structure uses grounding conductive parts that are directly buried in the soil. The moisture, acid, alkali and salt in the soil will continuously corrode the metal grounding conductive parts. After long-term use, the conductive parts are prone to rust, cross-sectional reduction or even breakage, which will prevent the lightning current from being successfully conducted to the ground, and the lightning protection system will completely fail, further increasing the probability of the transformer being damaged by lightning. Utility Model Content

[0005] The purpose of this invention is to provide a lightning-proof dry-type transformer to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a lightning-protected dry-type transformer, comprising: a transformer body; a first insulating plate, wherein multiple first insulating plates are arranged sequentially from front to back above the transformer body; a second insulating plate, wherein multiple second insulating plates are arranged sequentially from front to back above the first insulating plate, the second insulating plates being staggered from the first insulating plate; a conductive assembly, wherein multiple conductive assemblies are arranged staggered at the bottom ends of the first and second insulating plates; and a first surge arrester. Multiple first surge arresters are provided, and the multiple first surge arresters are evenly fixed to the top of the second insulating plate. Multiple second surge arresters are also provided, and the multiple second surge arresters are evenly fixed to the top of the first insulating plate. In the height direction of the transformer body, the top of the first surge arrester is higher than the top of the second surge arrester. Multiple metal strips are provided, some of which are fixed inside the first insulating plate and abut against the bottom of the second surge arrester, and other parts of which are fixed inside the second insulating plate and abut against the bottom of the first surge arrester.

[0007] Optionally, it further includes: a support cylinder, wherein multiple support cylinders are provided and are respectively installed on both sides of the top end of the transformer body. The top end of the support cylinder is connected to the second insulating plate, and the outer wall of the support cylinder is fixedly connected to the first insulating plate. Grooves are provided at the four corners of the upper surface of the second insulating plate. A second bolt is located inside the groove. The second bolt passes through the second insulating plate and the support cylinder in sequence and is threadedly connected to the transformer body. The second bolt is a non-conductive structure. A plug is embedded in the top end of the groove.

[0008] Optionally, it further includes: rubber rings, wherein multiple rubber rings are provided, and the multiple rubber rings are respectively provided at both ends of the multiple support cylinders, and the rubber rings are in a compressed state.

[0009] Optionally, the conductive component includes: a first metal connector, wherein multiple first metal connectors are provided, a portion of the first metal connectors are threadedly connected to one side of the bottom end of the first insulating plate and abut against the metal strip inside the first insulating plate, and another portion of the first metal connectors are threadedly connected to the other side of the bottom end of the second insulating plate and abut against the metal strip inside the second insulating plate; a conductor, the conductor being electrically connected to the bottom end of the first metal connectors; a second metal connector, the second metal connector being electrically connected to the bottom end of the conductor; and a third metal connector, the third metal connector being disposed below the second metal connectors, and a protective component being provided between the third metal connector and the second metal connector, the third metal connector being used to connect to the access terminal of an external grounding device.

[0010] Optionally, the protective assembly includes: a housing threadedly connected to the bottom end of the second metal connector; an anode block abutting against the inner bottom end of the housing; and a stop block abutting against the bottom end of the anode block, the stop block being fixedly connected to the bottom end of the second metal connector.

[0011] Optionally, it further includes: a folding tube, wherein multiple folding tubes are provided and the multiple folding tubes are respectively fitted onto the outside of multiple conductors; a T-ring, wherein multiple T-rings are provided and the multiple T-rings are respectively fixed to the upper and lower ends of the multiple folding tubes; and a first bolt, wherein multiple first bolts are provided, a portion of the first bolts being used to connect the upper T-ring to the first insulating plate or the second insulating plate, and another portion of the first bolts being used to connect the lower T-ring to the top of the external grounding device.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This lightning-protected dry-type transformer has the following advantages: Through the coordinated operation of various components, the operator first connects the third metal connector to the access terminal of the external grounding device. When the transformer installation area is struck by lightning, the super-strong lightning current first acts on the high-current first surge arrester. Most of the lightning energy and high current are quickly discharged to the ground through the low-impedance path formed by the first surge arrester, metal strip, first metal connector, conductor, second metal connector, shell and third metal connector, effectively weakening the lightning peak and preventing the high current from directly impacting the transformer body. After the lightning energy is discharged through the above path, the residual overvoltage and small lightning fluctuations are precisely clamped by the second surge arrester close to the high-voltage bushing of the transformer body, and are then conducted back to the grounding device through the conduction component to achieve secondary discharge. This stabilizes the intrusion voltage within the safe threshold of the transformer body insulation tolerance, reduces the risk of winding insulation breakdown and short circuit, and thus improves the operational safety of dry-type transformers in high-thunderstorm areas such as mountainous areas and coastal areas.

[0013] During long-term operation of equipment, buried conductive components may corrode due to the influence of soil moisture, acidity, alkali and salt. At this time, the anode block (magnesium alloy or zinc alloy) with higher metal activity will preferentially undergo oxidation reaction. As a sacrificial anode, the buried conductive component becomes the cathode through electrochemical principle, thereby inhibiting its corrosion process. This is the cathodic protection principle of sacrificial anode. It can extend the service life of buried conductive components in the grounding device, reduce the probability of transformer damage due to lightning strikes caused by grounding failure, and improve the overall reliability of the system.

[0014] After the third metal connector is grounded, the operator should pull down the T-ring at the bottom of the folded flexible tube so that the tube completely covers the outside of the conductor. Then, use the first bolt to secure it to the top of the external grounding device. The folded flexible tube can effectively protect the internal conductive components and ensure their long-term stable operation. During subsequent inspection and maintenance, the operator can loosen the first bolt counterclockwise to retract the folded flexible tube, and then loosen the second metal connector counterclockwise to separate it from the shell. The top of the shell will then open, making it easy to replace the corroded anode block and achieve long-term protection for buried conductive components. Attached Figure Description

[0015] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Enlarged view of point B in the middle; Figure 4 for Figure 1 The attached diagram shows the second insulating plate.

[0017] In the diagram: 1. Transformer body, 2. First insulating plate, 3. Second insulating plate, 4. Support cylinder, 5. First surge arrester, 6. Second surge arrester, 7. Metal strip, 8. First metal joint, 9. Conductor, 10. Second metal joint, 11. Third metal joint, 12. Shell, 13. Anode block, 14. Abutment block, 15. Folding flexible cylinder, 16. T-ring, 17. First bolt, 18. Plug, 19. Rubber ring, 20. Groove, 21. Second bolt. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1 to 4 The technical solution provided by this utility model is as follows: a lightning-protected dry-type transformer, comprising: a transformer body 1, multiple first insulating plates 2 arranged sequentially from front to back above the transformer body 1, multiple second insulating plates 3 arranged sequentially from front to back above the first insulating plates 2, the second insulating plates 3 being staggered from the first insulating plates 2, multiple conductive components arranged staggered at the bottom ends of the first insulating plates 2 and second insulating plates 3, and a first surge arrester 5. Multiple surge arresters 5 are provided, and multiple first surge arresters 5 are evenly fixed to the top of the second insulating plate 3. Multiple second surge arresters 6 are provided, and multiple second surge arresters 6 are evenly fixed to the top of the first insulating plate 2. In the height direction of the transformer body 1, the top of the first surge arrester 5 is higher than the top of the second surge arrester 6. Multiple metal strips 7 are provided, some of which are fixed inside the first insulating plate 2 and abut against the bottom of the second surge arrester 6, and other metal strips 7 are fixed inside the second insulating plate 3 and abut against the bottom of the first surge arrester 5.

[0020] In the specific implementation process, it is worth noting that both the first insulating plate 2 and the second insulating plate 3 are made of epoxy resin insulating material, which has excellent electrical insulation performance and mechanical strength. It can effectively isolate the conductive path between the surge arrester and the transformer body 1, and eliminate the risk of surface creepage. The first insulating plate 2 and the second insulating plate 3 adopt a staggered layered layout, so that the first surge arrester 5 is on the high outer side and the second surge arrester 6 is on the low inner side. The two form a high and low level and front and back depth in space. Relying on this physical staggered structure, the graded lightning protection sequence is realized. The progressive protection effect of "first discharge peak and then clamp" can be achieved without additional electrical series connection. The metal strip 7 is made of copper and is embedded in the inside of the insulating plate and makes close contact with the bottom of the surge arrester to form a low impedance discharge path to ensure smooth conduction of lightning current.

[0021] Furthermore, multiple support cylinders 4 are provided and installed on both sides of the top of the transformer body 1. The top of the support cylinder 4 is connected to the second insulating plate 3, and the outer wall of the support cylinder 4 is fixedly connected to the first insulating plate 2. The upper surface of the second insulating plate 3 has grooves 20 at each of the four corners. The second bolt 21 is located inside the groove 20 and passes through the second insulating plate 3 and the support cylinder 4 in sequence to be threadedly connected to the transformer body 1. The second bolt 21 is a non-conductive structure. The plug 18 is embedded in the top of the groove 20.

[0022] In the specific implementation process, it is worth noting that the support cylinder 4 is made of insulating engineering plastic injection molding, which has both supporting rigidity and insulation performance. It is used to support the first insulating plate 2 and the second insulating plate 3 and maintain the interlayer distance between them. The second bolt 21 is made of glass fiber reinforced nylon material and is a fully insulating fastener. It will not form a conductive path during the fastening process. The groove 20 is used to accommodate the second bolt 21. The plug 18 is made of silicone rubber material. After being embedded in the groove 20, it achieves sealing, dustproof and moistureproof, and prevents the second bolt 21 from aging due to long-term exposure to air. At the same time, it further optimizes the surface electric field distribution.

[0023] Furthermore, multiple rubber rings 19 are provided, and the multiple rubber rings 19 are respectively provided at both ends of multiple support cylinders 4. The rubber rings 19 are in a compressed state.

[0024] In the specific implementation process, it is worth noting that the rubber ring 19 is made of weather-resistant ethylene propylene rubber and is fitted onto the mating end faces at both ends of the support cylinder 4. After assembly, it is in a pre-compressed state. On the one hand, it can fill the assembly gap between the support cylinder 4, the second insulation plate 3, and the transformer body 1, playing a buffering and shock-absorbing role and weakening the transmission of the operating vibration of the transformer body 1 to the lightning protection structure. On the other hand, it can achieve end face sealing, preventing moisture and dust from entering the connection part along the inner wall of the support cylinder, avoiding the connection parts from getting damp and affecting their strength, and ensuring the long-term stability and electrical insulation reliability of the overall installation structure.

[0025] Furthermore, the conductive component includes: a first metal connector 8, wherein multiple first metal connectors 8 are provided; a portion of the first metal connectors 8 are threadedly connected to one side of the bottom end of the first insulating plate 2 and abut against the metal strip 7 inside the first insulating plate 2; another portion of the first metal connectors 8 are threadedly connected to the other side of the bottom end of the second insulating plate 3 and abut against the metal strip 7 inside the second insulating plate 3; a conductor 9, wherein the conductor 9 is electrically connected to the bottom end of the first metal connectors 8; a second metal connector 10, wherein the second metal connector 10 is electrically connected to the bottom end of the conductor 9; and a third metal connector 11, wherein the third metal connector 11 is disposed below the second metal connector 10; a protective component is provided between the third metal connector 11 and the second metal connector 10; and the third metal connector 11 is used to connect to the access terminal of an external grounding device.

[0026] In the specific implementation process, it is worth noting that the first metal connector 8, the second metal connector 10, and the third metal connector 11 are all made of brass with a tin-plated surface. The thin tin layer does not significantly increase the circuit impedance and does not affect the smooth discharge of lightning current. At the same time, it can isolate oxidation, reduce lap corrosion, maintain stable conductivity over a long period of time, and has excellent conductivity and corrosion resistance. The conductor 9 is a multi-stranded copper core soft wire with an outer insulating sheath, which has good flexibility and current carrying capacity and can adapt to the bending wiring requirements of the installation space. The entire conductive component forms a complete discharge path from the surge arrester to the grounding device. It has low impedance and good conductivity, ensuring that the lightning current can be quickly and smoothly conducted into the ground. The third metal connector 11 is a standardized grounding terminal that can be reliably connected to the external grounding device, which is convenient for on-site installation and construction as well as later maintenance and disassembly.

[0027] Furthermore, the protective assembly includes: a housing 12, which is threaded to the bottom end of the second metal connector 10; an anode block 13, which abuts against the bottom end of the interior of the housing 12; and abutment block 14, which abuts against the bottom end of the anode block 13 and is fixed to the bottom end of the second metal connector 10.

[0028] In the specific implementation process, it is worth noting that the housing 12 is also made of high-quality brass. The housing 12 is a cylindrical structure with an open top and internal threads on the inner wall. It is screwed together with the external threads on the outer wall of the second metal connector 10 to achieve easy assembly and disassembly. The anode block 13 is made of magnesium alloy or zinc alloy, which has a significantly higher metal activity than copper grounding conductors. It is used as a sacrificial anode. The abutment block 14 is made of soft rubber support, which can ensure that the anode block 13 is in full contact with the conductive housing 12. It is fixed to the bottom of the second metal connector 10. After screwing and assembly, it is tightly abutted against the anode block 13, ensuring that the anode block 13 maintains reliable electrical connection with the entire grounding conduction circuit. Based on the electrochemical conduction principle, even if the anode block 13 is in the closed installation space of the housing 12, it can still preferentially undergo oxidation corrosion through the electrical connection circuit, so that the buried grounding conductor is in a relatively cathodic state, thereby inhibiting soil corrosion of the grounding conductor and effectively extending the service life of the grounding path.

[0029] Furthermore, it also includes: folding flexible tubes 15, with multiple folding flexible tubes 15 respectively fitted onto the outside of multiple conductors 9; T-shaped rings 16, with multiple T-shaped rings 16 respectively fixed to the upper and lower ends of multiple folding flexible tubes 15; and first bolts 17, with multiple first bolts 17, some of which are used to connect the upper T-shaped rings 16 to the first insulating plate 2 or the second insulating plate 3, and others of which are used to connect the lower T-shaped rings 16 to the top of the external grounding device.

[0030] In the specific implementation process, it is worth noting that the folding soft tube 15 is made of waterproof and weather-resistant flexible insulating material and has an accordion-style telescopic folding structure. When stretched, it can completely cover the conductor 9 and the outer connection parts. When retracted, it facilitates the inspection and maintenance of the internal structure. The T-shaped rings 16 at the top and bottom are rigid insulating rings used to shape the soft tube port and provide an installation connection surface. The first bolt 17 is an insulating fastener used to fasten the T-shaped rings 16 to the bottom surface of the insulating plate and the top of the grounding device respectively, so as to achieve the sealing and fixing of the soft tube. The folding soft tube 15 can effectively block the corrosion of the grounding conductive components by external impurities, delay the aging and corrosion of the conductor and the joint parts, ensure the long-term low-resistance stable operation of the grounding circuit, and at the same time, it does not affect the regular replacement and maintenance of the anode block 13.

[0031] Working principle: Graded lightning protection and energy dissipation: The operator first connects the third metal connector 11 to the access terminal of the external grounding device. When the installation area of ​​the transformer body 1 is struck by lightning, the super-strong lightning current first acts on the first surge arrester 5 with high current flow. Most of the lightning energy and impulse current are quickly discharged to the ground through the low-impedance grounding path formed by the first surge arrester 5, metal strip 7, first metal connector 8, conductor 9, second metal connector 10, shell 12 and third metal connector 11, effectively weakening the lightning peak value and preventing the super-large impulse current from directly impacting the transformer body 1. After the first stage of energy discharge, the residual small overvoltage and lightning fluctuations are precisely clamped by the second surge arrester 6 set close to the high-voltage bushing of the transformer body 1, and are then conducted to the grounding device again through the conduction component to complete the secondary discharge, so that the intrusion voltage is stabilized within the safe threshold range that the transformer insulation can withstand, effectively reducing the probability of high-voltage winding insulation breakdown and short-circuit faults, and improving the operational stability of the equipment under complex working conditions of high thunderstorms.

[0032] Anodic corrosion protection: During long-term operation of the equipment, the grounding conductive components buried in the soil are susceptible to corrosion from soil moisture, acid, alkali and salt media, which can easily cause an increase in the grounding impedance or even a break in the circuit, leading to the failure of the lightning protection system. This device achieves sacrificial anode cathodic protection by adding an anode block 13 inside the shell 12. The anode block 13, the second metal connector 10, the conductor 9 and the buried grounding conductive components form a complete electrical connection circuit. Even if the anode block 13 is in the closed installation state of the shell 12, it can still work normally based on the electrochemical conduction principle. The anode block 13 is made of an alloy material with stronger metal activity, which preferentially undergoes oxidation corrosion in the electrochemical circuit, so that the buried grounding conductor is relatively kept in a cathodic state, effectively inhibiting the corrosion reaction of the grounding conductor, greatly extending the service life of the buried conductive structure, avoiding the problem of lightning protection failure caused by grounding failure, further reducing the risk of lightning damage to the transformer body 1, and improving the long-term reliability of the overall lightning protection system.

[0033] Structural protection and maintenance: After the grounding assembly of the third metal connector 11 is completed, the operator pulls down the T-ring 16 at the bottom of the folding soft tube 15 so that the folding soft tube 15 completely covers the conductor 9 and the surface of the outer conductive structure. The bottom T-ring 16 is then fastened to the top of the external grounding device by the first bolt 17. The folding soft tube 15 is used to protect the internal conductive components and ensure the long-term stable operation of the grounding conductive circuit. During the later inspection and maintenance of the equipment, the first bolt 17 can be loosened counterclockwise to retract the folding soft tube 15. Then, the second metal connector 10 can be unscrewed counterclockwise to separate it from the shell 12. The opening at the top of the shell 12 can be opened to quickly replace the severely corroded anode block 13. The operation is convenient and can continuously provide long-term anti-corrosion protection for the buried grounding structure. The overall practicality and maintainability of the equipment are enhanced.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightning-protected dry-type transformer, characterized in that, include: Transformer body (1); First insulating plate (2), multiple first insulating plates (2) are provided, and multiple first insulating plates (2) are arranged sequentially from front to back above the transformer body (1); Second insulating plate (3), multiple second insulating plates (3) are provided, and multiple second insulating plates (3) are arranged sequentially above the first insulating plate (2) from front to back, and the second insulating plates (3) are staggered from the first insulating plate (2); Conductive components, wherein multiple conductive components are provided, and the multiple conductive components are respectively staggered at the bottom ends of the first insulating plate (2) and the second insulating plate (3); First surge arrester (5), multiple first surge arresters (5) are provided, and multiple first surge arresters (5) are evenly fixed to the top of the second insulating plate (3); Second surge arrester (6), multiple second surge arresters (6) are provided, and multiple second surge arresters (6) are evenly fixed to the top of the first insulating plate (2). In the height direction of the transformer body (1), the top of the first surge arrester (5) is higher than the top of the second surge arrester (6). Metal strips (7) are provided in multiples. Some of the metal strips (7) are fixed inside the first insulating plate (2) and abut against the bottom end of the second surge arrester (6). Other metal strips (7) are fixed inside the second insulating plate (3) and abut against the bottom end of the first surge arrester (5).

2. A lightning-protected dry-type transformer according to claim 1, characterized in that, Also includes: Support cylinder (4), multiple support cylinders (4) are provided, and multiple support cylinders (4) are respectively installed on both sides of the top end of the transformer body (1). The top end of the support cylinder (4) is connected to the second insulating plate (3), and the outer wall of the support cylinder (4) is fixedly connected to the first insulating plate (2). The upper surface of the second insulating plate (3) has grooves (20) at all four corners; The second bolt (21) is located inside the groove (20). The second bolt (21) passes through the second insulating plate (3) and the support cylinder (4) in sequence and is threaded to the transformer body (1). The second bolt (21) is a non-conductive structure. A plug (18) is embedded at the top of the inside of the groove (20).

3. A lightning-protected dry-type transformer according to claim 2, characterized in that, Also includes: Rubber rings (19), multiple rubber rings (19) are provided, and multiple rubber rings (19) are respectively provided at both ends of multiple support cylinders (4), and the rubber rings (19) are in a compressed state.

4. A lightning-protected dry-type transformer according to claim 1, characterized in that, The conductive components include: First metal connector (8), multiple first metal connectors (8) are provided. A portion of the first metal connectors (8) are threaded to one side of the bottom end of the first insulating plate (2) and abut against the metal strip (7) inside the first insulating plate (2). Another portion of the first metal connectors (8) are threaded to the other side of the bottom end of the second insulating plate (3) and abut against the metal strip (7) inside the second insulating plate (3). Conductor (9), which is electrically connected to the bottom end of the first metal connector (8); The second metal connector (10) is electrically connected to the bottom end of the conductor (9); The third metal connector (11) is located below the second metal connector (10). A protective component is provided between the third metal connector (11) and the second metal connector (10). The third metal connector (11) is used to connect to the access terminal of an external grounding device.

5. A lightning-protected dry-type transformer according to claim 4, characterized in that, The protective components include: The housing (12) is threaded to the bottom end of the second metal connector (10); An anode block (13) abuts against the bottom interior of the housing (12); Abutment (14) abuts against the bottom end of the anode block (13) and is fixed to the bottom end of the second metal connector (10).

6. A lightning-protected dry-type transformer according to claim 4, characterized in that, Also includes: A folding soft tube (15) is provided in multiple ways, and the multiple folding soft tubes (15) are respectively fitted on the outside of the multiple conductors (9); T-shaped rings (16), multiple T-shaped rings (16) are provided, and multiple T-shaped rings (16) are respectively fixed to the upper and lower ends of multiple folding soft tubes (15); The first bolt (17) is provided in multiple parts. A portion of the first bolt (17) is used to connect the upper T-ring (16) to the first insulating plate (2) or the second insulating plate (3), and another portion of the first bolt (17) is used to connect the lower T-ring (16) to the top of the external grounding device.

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