Transformer gas relay protection structure

Abstract

The utility model discloses a transformer gas relay protection structure, which relates to the technical field of power equipment protection, and comprises an insulation protection sleeve, a first sealing cover plate and a second sealing cover plate, and the insulation protection sleeve is located between the first sealing cover plate and the second sealing cover plate. Mounting holes matched with the first sealing cover plate and the second sealing cover plate are formed in the left end and the right end of the insulating protective sleeve respectively, and the first sealing cover plate and the second sealing cover plate are detachably connected to the mounting holes in the left end and the right end of the insulating protective sleeve respectively, so that a closed cavity used for containing the gas relay is defined; the first sealing cover plate and the second sealing cover plate are each provided with an oil pipe hole and a threading hole, the oil pipe holes are used for allowing oil pipes of the gas relays to penetrate through, and the threading holes are used for allowing secondary wires of the gas relays to penetrate through. The gas relay has a simple structure, is convenient to install, and can effectively prevent rainwater and small animals from entering the gas relay through the integral encapsulation and insulation design, thereby effectively improving the safety of equipment.

Description

Technical Field

[0001] This application relates to the field of power equipment protection technology, and in particular to a transformer gas relay protection structure. Background Technology

[0002] In power systems, gas relays are core protective components for oil-immersed electrical equipment such as oil-immersed power transformers and reactors. Their main function is to monitor the generation of methane gas and changes in oil level within the equipment. When faults such as insulation breakdown or localized overheating occur, the gas relay can promptly activate and issue an alarm or trip signal, ensuring the safe and stable operation of the power equipment. Therefore, the operating status of the gas relay directly affects the safe and stable operation of the transformer. In practical applications, gas relays are typically installed outdoors, making them susceptible to external factors such as rain, birds, and small animals.

[0003] To protect gas relays from the effects of the natural environment in outdoor or open-air conditions, existing technologies typically use a rain cover to protect them from direct rain. However, existing rain covers for gas relays have the following shortcomings: they only shield the top and sides from direct rainfall, have poor sealing, and leave a large gap between the cover and the gas relay, allowing small animals such as rodents, insects, and birds to enter. Birds can easily build nests in this gap, and nesting debris (such as twigs and dry grass) may clog the secondary wires of the gas relay or trigger malfunctions in the internal mechanism. Furthermore, rodents, insects, and birds can also enter the gas relay through the gap, damaging the internal insulation structure. Nesting debris can also affect the gas relay's heat dissipation and normal operation, causing equipment malfunctions. Utility Model Content

[0004] This application provides a protective structure for a transformer gas relay, which effectively prevents rainwater and small animals from entering the gas relay, thereby effectively improving equipment safety.

[0005] In view of this, this application provides a transformer gas relay protection structure, including: an insulating protective sleeve, a first cover plate, and a second cover plate;

[0006] The insulating protective sleeve is located between the first cover plate and the second cover plate;

[0007] The insulating protective sleeve has mounting holes at its left and right ends that mate with the first cover plate and the second cover plate, respectively.

[0008] The first cover plate and the second cover plate are detachably connected to the mounting holes at the left and right ends of the insulating protective sleeve to form a closed cavity for accommodating the gas relay;

[0009] Both the first and second cover plates are provided with oil pipe holes and wire holes;

[0010] The oil pipe hole is used for the oil pipe of the gas relay to pass through;

[0011] The wire hole is used for the secondary wires of the gas relay to pass through.

[0012] Optionally, the insulating protective sleeve includes a C-shaped insulating protective cover and a fixing strap;

[0013] The fixing strap is located on the outside of the opening of the C-shaped insulating protective cover and is detachably connected to the C-shaped insulating protective cover, so as to form a tubular structure by the C-shaped insulating protective cover and the fixing strap.

[0014] Optionally, one side of the fixing strap is detachably connected to one end of the C-shaped insulating protective cover via a fixing member;

[0015] The other side of the fixing strap is detachably connected to the other end of the C-shaped insulating protective cover via a snap-fit ​​structure.

[0016] Optionally, the engaging structure includes a protrusion on the fixing band and a slot on the C-shaped insulating protective cover;

[0017] The protrusion corresponds to the position of the slot;

[0018] The fixing strap is secured to the other end of the C-shaped insulating protective cover by engaging the groove with the protrusion.

[0019] Optionally, the number of the protrusions is multiple;

[0020] The plurality of the protruding strips are distributed at equal intervals along the length direction of the fixing strip;

[0021] The number of slots is equal to the number of protrusions, and they are set in a one-to-one correspondence.

[0022] Optionally, the fixing band has a through hole for the fixing member to pass through;

[0023] The C-shaped insulating protective cover is provided with a fixing hole that matches the through hole;

[0024] The fixing strap is fixed to one end of the C-shaped insulating protective cover by passing through the through hole and the fixing hole in sequence via the fixing member.

[0025] Optionally, the number of through holes is multiple;

[0026] The plurality of through holes are distributed at equal intervals along the length direction of the fixing strip;

[0027] The number of fixing holes is equal to the number of through holes, and they are set in a one-to-one correspondence.

[0028] Optionally, the fastener includes a nylon bolt and a nylon nut that is threadedly engaged with the nylon bolt;

[0029] The nylon bolt passes through the through hole on the fixing band and the fixing hole on the C-shaped insulating protective cover in sequence, and is then threadedly connected to the nylon nut.

[0030] Optionally, the C-shaped insulating protective cover is provided with an oil window mounting hole;

[0031] An oil level observation window is fixed at the oil window mounting hole.

[0032] Optionally, the oil level observation window is a transparent plastic sheet;

[0033] The thickness of the oil level observation window is 3-5mm.

[0034] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: The protective structure of this transformer gas relay, through the cooperation of the insulating protective sleeve, the first cover plate, and the second cover plate, forms a closed cavity that completely encloses the gas relay. This fundamentally changes the shortcomings of existing rain covers, which can only partially shield and have large gaps, and achieves all-round tight sealing, thereby significantly improving the overall protective sealing performance and effectively preventing the intrusion of rainwater and moisture. At the same time, this sealed cavity completely eliminates the gap between the rain cover and the relay body, fundamentally preventing small animals such as rodents, insects, and birds from entering the interior and nesting in the gaps. This avoids equipment failures caused by small animals damaging the insulation structure, nesting debris affecting heat dissipation, or triggering malfunctions, greatly improving the reliability and stability of the gas relay and ensuring the safe and stable operation of the transformer. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the transformer gas relay protection structure in the embodiments of this application;

[0036] Figure 2 This is a schematic diagram of the transformer gas relay protection structure from another angle in an embodiment of this application;

[0037] Figure 3 This is a schematic diagram showing the disassembled structure of the transformer gas relay protection structure in the embodiments of this application;

[0038] Figure 4This is a schematic diagram of the structure of the insulating protective sleeve in the embodiments of this application;

[0039] Figure 5 This is a schematic diagram of the C-shaped insulating protective cover in the embodiments of this application;

[0040] Figure 6 This is a schematic diagram of the structure of the first cover plate in the embodiments of this application;

[0041] Figure 7 This is a schematic diagram of the structure of the second cover plate in an embodiment of this application;

[0042] Figure 8 This is a schematic diagram of the fixing strap structure in an embodiment of this application;

[0043] Figure 9 This is a schematic diagram illustrating the use of the transformer gas relay protection structure in the embodiments of this application.

[0044] The attached figures are labeled as follows:

[0045] 1-Insulating protective sleeve, 11-C-shaped insulating protective cover, 111-Oil level observation window, 112-Fixing hole, 113-Slot, 12-Opening, 13-Fixing strap, 131-Through hole, 132-Raised strip, 14-Fixing component, 141-Nylon bolt, 142-Nylon nut, 2-First sealing plate, 21-Oil pipe hole, 22-Wire hole, 3-Second sealing plate, 4-Oil pipe, 5-Secondary wire. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0047] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] This application provides an embodiment of a transformer gas relay protection structure. Please refer to the details below. Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7 as well as Figure 9 .

[0050] The transformer gas relay protection structure in this embodiment includes: an insulating protective sleeve 1, a first cover plate 2, and a second cover plate 3. The insulating protective sleeve 1 is located between the first cover plate 2 and the second cover plate 3. The left and right ends of the insulating protective sleeve 1 are respectively provided with mounting holes that cooperate with the first cover plate 2 and the second cover plate 3. The first cover plate 2 and the second cover plate 3 are respectively detachably connected to the mounting holes at the left and right ends of the insulating protective sleeve 1 to form a closed cavity for accommodating the gas relay. The first cover plate 2 and the second cover plate 3 are each provided with an oil pipe hole 21 and a wire hole 22. The oil pipe hole 21 is used for the oil pipe 4 of the gas relay to pass through, and the wire hole 22 is used for the secondary wire 5 of the gas relay to pass through.

[0051] It should be noted that the protective structure of this transformer gas relay, through the cooperation of the insulating protective sleeve 1, the first cover plate 2, and the second cover plate 3, forms a closed cavity that completely encloses the gas relay. This fundamentally changes the shortcomings of existing rain covers, which can only provide partial protection and have large gaps. It achieves all-round tight sealing, thereby significantly improving the overall protective sealing performance and effectively preventing the intrusion of rainwater and moisture. At the same time, this sealed cavity completely eliminates the gap between the rain cover and the relay body, fundamentally preventing small animals such as rodents, insects, and birds from entering the interior and nesting in the gaps. This avoids equipment failures caused by small animals damaging the insulation structure, nesting debris affecting heat dissipation, or triggering malfunctions. It greatly improves the reliability and stability of the gas relay and ensures the safe and stable operation of the transformer.

[0052] The above is Embodiment 1 of a transformer gas relay protection structure provided in this application. The following is Embodiment 2 of a transformer gas relay protection structure provided in this application. Please refer to the following for details. Figures 1 to 9 .

[0053] The transformer gas relay protection structure in this embodiment includes: an insulating protective sleeve 1, a first cover plate 2, and a second cover plate 3. The insulating protective sleeve 1 is located between the first cover plate 2 and the second cover plate 3. The left and right ends of the insulating protective sleeve 1 are respectively provided with mounting holes that mate with the first cover plate 2 and the second cover plate 3. The first cover plate 2 and the second cover plate 3 are detachably connected to the mounting holes at the left and right ends of the insulating protective sleeve 1 to form a closed cavity for accommodating the gas relay. Both the first cover plate 2 and the second cover plate 3 are provided with an oil pipe hole 21 and a wire hole 22. The oil pipe hole 21 is used for the oil pipe 4 of the gas relay to pass through, and the wire hole 22 is used for the secondary wire 5 of the gas relay to pass through. Specifically, the oil pipe hole 21 is located on one side of the wire hole 22.

[0054] It should be noted that the gas relay is installed on oil pipe 4, and the secondary line 5 of the gas relay is the signal transmission line connecting the gas relay and the protection device (such as the control cabinet). Its function is to transmit the light or heavy gas activation signal detected by the gas relay to the protection device. The protective structure of this transformer gas relay fixes the first cover plate 2 and the second cover plate 3 to the left and right ends of the insulating protective sleeve 1 to form a closed cavity. Only the oil pipe hole 21 and the wire hole 22 matching the function of the gas relay are reserved. There are no irregular gaps. Through the overall encapsulation performance of the insulating protective sleeve 1 and the first cover plate 2 and the second cover plate 3, the space required for birds to build nests is completely eliminated, and small animals such as rodents and insects are prevented from entering the protective structure and damaging the gas relay.

[0055] Preferably, the wire hole 22 is located at the lower part of the first cover plate 2 and the second cover plate 3. It can be understood that the secondary wire 5 of the gas relay enters the insulating protective sleeve 1 through the wire hole 22 at the lower part of the first cover plate 2 and the second cover plate 3 and connects to the bottom of the gas relay. The secondary wire 5 is then connected to the junction box on one side of the gas relay. This bottom connection, in conjunction with the first cover plate 2 and the second cover plate 3, effectively prevents rainwater from seeping into the junction box, thereby greatly improving the rainproof effect and ensuring the dryness and stability of the internal components of the junction box.

[0056] Specifically, the insulating protective sleeve 1 includes a C-shaped insulating protective cover 11, a fixing strap 13, and a fixing member 14. The fixing strap 13 covers the outside of the opening 12 of the C-shaped insulating protective cover 11 and is detachably connected to the C-shaped insulating protective cover 11, so that the C-shaped insulating protective cover 11 and the fixing strap 13 form a tubular structure.

[0057] In this embodiment, the C-shaped insulating protective cover 11 is made of high-temperature resistant (temperature range -60℃ to 200℃) and aging-resistant methyl vinyl silicone rubber. It is formed by vulcanization through a customized mold. The C-shaped insulating protective cover 11 can be bent into a C shape to ensure that the C-shaped insulating protective cover 11 can completely cover the gas relay. The first cover plate 2 and the second cover plate 3 are made of epoxy resin rigid insulating material (compatible with the silicone rubber C-shaped insulating protective cover 11). According to the diameter of the oil pipe 4 and the secondary wire 5 of the gas relay to be protected, oil pipe holes 21 matching the diameter of the oil pipe 4 of the gas relay and wire holes 22 matching the diameter of the secondary wire 5 are opened on the first cover plate 2 and the second cover plate 3. The fixing band 13 is made of methyl vinyl silicone rubber tape with a width of 50mm and a thickness of 3mm.

[0058] One side of the fixing strap 13 is detachably connected to one end of the C-shaped insulating protective cover 11 via the fixing member 14; the other side of the fixing strap 13 is detachably connected to the other end of the C-shaped insulating protective cover 11 via the snap-fit ​​structure.

[0059] It should be noted that the C-shaped insulating protective cover 11 is enclosed and fixed by the fixing strap 13 and the fixing piece 14, so that the protective structure can be detachably fixed to the gas relay. When the gas relay needs to be repaired, simply remove the fixing piece 14 and loosen the fixing strap 13 to open the opening 12 of the C-shaped insulating protective cover 11, exposing the gas relay. Then, remove the first cover plate 2 and the second cover plate 3 from both ends of the C-shaped insulating protective cover 11 to perform the repair operation. The operation is simple and quick. After the repair is completed, the C-shaped insulating protective cover 11 is reset and fixed by the fixing strap 13 and the fixing piece 14, which effectively improves the firmness of the C-shaped insulating protective cover 11. The whole process does not require complicated tools and cumbersome steps, which greatly improves the repair efficiency and reduces the labor intensity of the workers.

[0060] The engaging structure includes a protrusion 132 on the fixing band 13 and a slot 113 on the C-shaped insulating protective cover 11; the protrusion 132 and the slot 113 are positioned correspondingly, and the fixing band 13 is fixed to the other end of the C-shaped insulating protective cover 11 by engaging the protrusion 132 with the slot 113.

[0061] There are multiple protrusions 132, which are evenly distributed along the length of the fixing belt 13. The number of slots 113 is equal to the number of protrusions 132, and they are set in a one-to-one correspondence.

[0062] The fixing strap 13 has a through hole 131 for the fixing member 14 to pass through. The C-shaped insulating protective cover 11 has a corresponding fixing hole 112 that matches the through hole 131. The fixing strap 13 is fixed to one end of the C-shaped insulating protective cover 11 by the fixing member 14 passing through the through hole 131 and the fixing hole 112 in sequence.

[0063] There are multiple through holes 131, which are evenly distributed along the length of the fixing band 13. The number of fixing holes 112 is equal to the number of through holes 131, and they are set in a one-to-one correspondence.

[0064] Specifically, multiple protrusions 132 are distributed at intervals on one side of multiple through holes 131.

[0065] It should be noted that: one side of the fixing strap 13 is tightened and fixed by multiple fasteners 14 passing through the through hole 131 of the fixing strap 13 and the fixing hole 112 of the C-shaped insulating protective cover 11 in sequence. The other side of the fixing strap 13 is inserted into the slot 113 of the C-shaped insulating protective cover 11 by multiple protrusions 132 to achieve a detachable connection between the fixing strap 13 and the C-shaped insulating protective cover 11. After the fixing strap 13 is installed and fixed, the opening 12 can be completely closed, so that the C-shaped insulating protective cover 11 tightly wraps around the outside of the gas relay, which plays a good sealing and encapsulation role. At the same time, its installation and operation are convenient and the fastening is firm.

[0066] The fastener 14 includes a nylon bolt 141 and a nylon nut 142 that is threadedly engaged with the nylon bolt 141; the nylon bolt 141 passes through the through hole 131 on the fixing band 13 and the fixing hole 112 on the C-shaped insulating protective cover 11 in sequence, and is then threadedly connected to the nylon nut 142.

[0067] In this embodiment, the fastener 14 is made of standard M6 white nylon bolt 141 and nylon nut 142 that mates with the M6 ​​white nylon bolt 141. The fastener 14 is made of white nylon material, which has excellent insulation and corrosion resistance, and can avoid the problem of reduced insulation performance caused by metal materials. At the same time, it is suitable for the long-term operating environment of power equipment, avoids the problem of metal screws being unable to be disassembled after rusting, and prevents the potential difference formed by metal parts from interfering with the relay signal.

[0068] The C-shaped insulating protective cover 11 has an oil window mounting hole, and an oil level observation window 111 is fixed at the oil window mounting hole. By setting the oil level observation window 111, it is convenient for staff to observe the status of the gas relay.

[0069] The oil level observation window 111 is a transparent plastic sheet with a thickness of 3-5mm. In this embodiment, the oil level observation window 111 is made of a 4mm thick PC material transparent plastic sheet. Using a high-transmittance, high-refractive-index, and high-impact-resistant PC material, the observation window 111 allows operators to clearly observe the oil level inside the gas relay, facilitating timely understanding of the relay's operating status. The high impact resistance of the PC material ensures the oil level observation window 111 is not easily damaged, thus maintaining oil level observation while ensuring the durability of the protective structure. The overall device effectively improves the operational stability of the gas relay, ensuring the safe and reliable operation of electrical equipment and has broad application value. The transparent plastic sheet is fixed to the oil window mounting hole of the insulating protective sleeve 1 using silicone sealant. The silicone sealant application width is 5mm to ensure a leak-free seal.

[0070] Preferably, the surfaces of the C-shaped insulating protective cover 11, the fixing strap 13, the first cover plate 2, and the second cover plate 3 are all coated with a red environmentally friendly coating. Specifically, a red polymer material can be mixed and infiltrated with the sheath material to ensure uniform and stable color. Since red is one of the colors that birds dislike, visual stimulation can prevent most birds from approaching the protective structure, thereby reducing the probability of birds staying and nesting around the protective structure from the source.

[0071] The protective structure of this transformer gas relay is formed by the first cover plate 2, the second cover plate 3 and the insulating protective sleeve 1 to form a closed cavity. Only the first cover plate 2 and the second cover plate 3 are reserved with oil pipe holes 21 and wire holes 22 that match the function of the gas relay. The gas relay is completely wrapped by the overall closed cavity structure, and the oil pipe holes 21 and wire holes 22 of the first cover plate 2 and the second cover plate 3 are matched with the oil pipe 4 and secondary wire 5 of the gas relay. Specifically, the secondary wires 5 of the gas relay enter the interior of the insulating protective sleeve 1 through the wire holes 22 of the first cover plate 2 and the second cover plate 3 at both ends of the insulating protective sleeve 1, and then connect to the junction box of the gas relay. The oil pipe 4 on the gas relay passes through the oil pipe holes 21 of the first cover plate 2 and the second cover plate 3 at one end of the insulating protective sleeve 1, realizing the "bottom entry of the gas relay" layout. Combined with the high sealing performance of the first cover plate 2 and the second cover plate 3 sealing the insulating protective sleeve 1, it can completely prevent rainwater from entering the interior of the insulating protective sleeve 1, avoid corrosion and short circuit of the wiring terminals, and ensure the reliability of the signal transmission of the gas relay. In addition, the oil level observation window 111 is sealed with PC transparent plastic sheet without any irregular gaps, completely eliminating the space required for birds to build nests, and preventing small animals such as rodents and insects from entering the protective structure and damaging the gas relay structure. This effectively improves the protective effect of the gas relay, ensures the stable operation of power equipment, and has high practical value and promotion prospects.

[0072] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A transformer gas relay protection structure, characterized in that, include: Insulating protective sleeve, first sealing plate and second sealing plate; The insulating protective sleeve is located between the first cover plate and the second cover plate; The insulating protective sleeve has mounting holes at its left and right ends that mate with the first cover plate and the second cover plate, respectively. The first cover plate and the second cover plate are detachably connected to the mounting holes at the left and right ends of the insulating protective sleeve to form a closed cavity for accommodating the gas relay; Both the first and second cover plates are provided with oil pipe holes and wire holes; The oil pipe hole is used for the oil pipe of the gas relay to pass through; The wire hole is used for the secondary wires of the gas relay to pass through.

2. The transformer gas relay protection structure according to claim 1, characterized in that, The insulating protective sleeve includes a C-shaped insulating protective cover and a fixing strap; The fixing strap is located on the outside of the opening of the C-shaped insulating protective cover and is detachably connected to the C-shaped insulating protective cover, so as to form a tubular structure by the C-shaped insulating protective cover and the fixing strap.

3. The transformer gas relay protection structure according to claim 2, characterized in that, One side of the fixing strap is detachably connected to one end of the C-shaped insulating protective cover via a fixing member; The other side of the fixing strap is detachably connected to the other end of the C-shaped insulating protective cover via a snap-fit ​​structure.

4. The transformer gas relay protection structure according to claim 3, characterized in that, The engaging structure includes a protrusion on the fixing band and a slot on the C-shaped insulating protective cover; The protrusion corresponds to the position of the slot; The fixing strap is secured to the other end of the C-shaped insulating protective cover by engaging the groove with the protrusion.

5. The transformer gas relay protection structure according to claim 4, characterized in that, The number of the protrusions is multiple; The plurality of the protruding strips are distributed at equal intervals along the length direction of the fixing strip; The number of slots is equal to the number of protrusions, and they are set in a one-to-one correspondence.

6. The transformer gas relay protection structure according to claim 3, characterized in that, The fixing band has through holes for the fixing member to pass through; The C-shaped insulating protective cover is provided with a fixing hole that matches the through hole; The fixing strap is fixed to one end of the C-shaped insulating protective cover by passing through the through hole and the fixing hole in sequence via the fixing member.

7. The transformer gas relay protection structure according to claim 6, characterized in that, The number of through holes is multiple; The plurality of through holes are distributed at equal intervals along the length direction of the fixing strip; The number of fixing holes is equal to the number of through holes, and they are set in a one-to-one correspondence.

8. The transformer gas relay protection structure according to claim 6, characterized in that, The fastener includes a nylon bolt and a nylon nut that is threaded into the nylon bolt; The nylon bolt passes through the through hole on the fixing band and the fixing hole on the C-shaped insulating protective cover in sequence, and is then threadedly connected to the nylon nut.

9. The transformer gas relay protection structure according to claim 2, characterized in that, The C-shaped insulating protective cover is provided with an oil window mounting hole; An oil level observation window is fixed at the oil window mounting hole.

10. The transformer gas relay protection structure according to claim 9, characterized in that, The oil level observation window is a transparent plastic sheet; The thickness of the oil level observation window is 3-5mm.

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