Fuse assembly and oil-immersed transformer

Abstract

The application discloses a fuse assembly and an oil-immersed transformer, and relates to the technical field of electric power. The fuse assembly comprises a fuse main body, a mounting seat and a sealing piece. The mounting seat is connected with the fuse main body. The mounting seat is used for being detachably assembled at an upper opening of an oil tank, so that the fuse main body enters an inner cavity of the oil tank from top to bottom, and the fuse main body is directly contacted with insulating oil liquid in the inner cavity. The sealing piece is arranged on the mounting seat and surrounds the fuse main body. When the mounting seat is assembled at the upper opening of the oil tank, the sealing piece is used for being attached to the oil tank, so as to prevent the insulating oil liquid in the inner cavity from leaking outward. The application cancels a sleeve, so that the fuse main body is directly contacted with the insulating oil liquid, thereby improving the insulation performance and heat dissipation efficiency of the fuse by using the high dielectric strength and high thermal conductivity of the insulating oil liquid while reducing the volume of the oil-immersed transformer and improving the simplicity and compactness of the structure of the oil-immersed transformer.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a fuse assembly and an oil-immersed transformer. Background Technology

[0002] With the global energy structure shifting towards clean energy and the rapid development of the new energy industry, various electrical equipment, as core equipment adapted to the characteristics of new energy power generation and meeting the operational needs of new energy power systems, plays a crucial role in supporting the industry's development through its technical performance and design level. Currently, electrical equipment, represented by new energy transformers, is evolving towards larger capacity, higher efficiency, and lower losses. Simultaneously, in global applications, it must meet the transportation size requirements of standard shipping containers, which places higher demands on the structural design of electrical equipment.

[0003] However, increasing the capacity of existing electrical equipment often comes at the cost of increased size and weight. Their structural designs are not sufficiently streamlined or compact, which not only increases transportation and installation costs but also makes them difficult to adapt to the size restrictions of containers used in export scenarios, thus hindering the widespread application of high-capacity electrical equipment. Therefore, developing electrical equipment with streamlined structures and compact sizes has become a pressing technological need for the industry. Utility Model Content

[0004] The main purpose of this application is to propose a fuse assembly that addresses the technical problem that existing electrical equipment is insufficient in terms of structural simplicity and compact size, making it difficult to adapt to the container size restrictions in export scenarios, thus hindering the promotion and application of high-capacity electrical equipment.

[0005] To achieve the above objectives, the fuse assembly proposed in this application includes:

[0006] Fuse body;

[0007] Mounting bracket, which is connected to the fuse body;

[0008] A seal is disposed on the mounting base and surrounds the fuse body.

[0009] In one embodiment, the fuse body includes an insulating transition member and a fuse core structure. The insulating transition member extends along a first direction, with a first end connected to the mounting base and a second end connected to the fuse core structure.

[0010] In one embodiment, the fused core structure includes a first conductive cover assembly, a second conductive cover assembly, an insulating cylinder, and a fuse; the first conductive cover assembly covers one end of the insulating cylinder, the second conductive cover assembly covers the other end of the insulating cylinder, the first conductive cover assembly is threadedly connected to the second end of the insulating transition piece, the first conductive cover assembly is used to connect the input section of an external lead, and the second conductive cover assembly is used to connect the output section of an external lead; the insulating cylinder is filled with a quartz sand layer, the fuse is encapsulated in the quartz sand layer, one end of the fuse is connected to the first conductive cover assembly, and the other end of the fuse is connected to the second conductive cover assembly.

[0011] In one embodiment, the insulating transition element is made of epoxy resin.

[0012] In one embodiment, the fuse assembly further includes a handle disposed on the mounting base.

[0013] In one embodiment, the handle includes a first vertical connecting section, a second vertical connecting section, and a horizontal gripping section. One end of the first vertical connecting section is connected to the mounting base, and one end of the second vertical connecting section is connected to the mounting base. The first vertical connecting section and the second vertical connecting section are spaced apart. One end of the horizontal gripping section is connected to the other end of the first vertical connecting section, and the other end of the horizontal gripping section is connected to the other end of the second vertical connecting section.

[0014] In one embodiment, the surface of the handle is provided with an anti-slip textured structure.

[0015] In one embodiment, the handle has at least two spaced-apart gripping grooves.

[0016] In one embodiment, the seal is bonded and fixed to the surface of the mounting base.

[0017] In one embodiment, the mounting base has a mounting surface, and the fuse body is connected to the mounting surface;

[0018] The sealing element includes an annular sealing ring, the cross-sectional shape of which is formed by a straight segment and an arc segment. The straight segment surrounds the annular sealing ring to form an annular plane, and the arc segment surrounds the annular sealing ring to form an annular arc surface. The annular plane is bonded and fixed to the mounting plane.

[0019] In one embodiment, the fuse assembly includes at least two of the seals, which are stacked sequentially from the inside to the outside in the radial direction.

[0020] In one embodiment, the fuse body is provided with a connecting screw hole, and the mounting base is provided with a tapered through hole. The tapered through hole is disposed opposite to the connecting screw hole, and the diameter of the tapered through hole gradually increases in the direction away from the connecting screw hole.

[0021] The fuse assembly also includes a threaded connector that passes through the tapered through hole and is locked into the connecting screw hole.

[0022] This application also proposes an oil-immersed transformer, which includes an oil tank and a fuse assembly as described above.

[0023] The oil tank has an upper opening that communicates with the inner cavity of the oil tank; the mounting base of the fuse assembly is detachably assembled at the upper opening, the seal of the fuse assembly is in contact with the oil tank, and the fuse body of the fuse assembly is in direct contact with the insulating oil in the inner cavity.

[0024] In one embodiment, the oil-immersed transformer further includes external leads; the fuse body is connected to the external leads to divide the external leads into an input section and an output section;

[0025] The oil tank has a lead wire through hole, which communicates with the inner cavity, and the input section passes through the lead wire through hole; the oil-immersed transformer also includes an insulating bushing, which is sleeved on the input section and is pluggably connected to the lead wire through hole.

[0026] This application proposes a solution that moves the opening for installing fuses on the oil tank of existing oil-immersed transformers and other electrical equipment from the vertical side wall to the top, forming a top opening. This allows the fuse body of the fuse assembly to be installed into the inner cavity of the oil tank through the top opening in a vertical direction, and also to be removed from the inner cavity in a vertical direction. In other words, the existing side-mounting method is correspondingly changed to a top-mounting method. Under the action of gravity, the insulating oil in the inner cavity gathers downwards, so even if the fuse body is removed from the inner cavity, the insulating oil will not leak out through the top opening. Furthermore, this application proposes a solution that also provides a sealing element on the mounting base of the fuse assembly. When the mounting base is closed at the top opening and the fuse body is installed in the inner cavity, the sealing element can fit against the oil tank to form a seal, thereby ensuring that the insulating oil does not leak. Based on the above configuration, the risk of insulating oil leakage can be eliminated during the assembly and disassembly of fuse components. This eliminates the need for the sleeve used in existing solutions to separate the fuse body from the insulating oil, thus eliminating the need for the sleeve. Eliminating the sleeve reduces the space occupied inside the oil tank, allowing for a smaller tank size while maintaining performance. This results in a more streamlined and compact structure for oil-immersed transformers and other electrical equipment, reducing transportation and installation costs and better adapting to container size limitations in export scenarios. Furthermore, the fuse body, installed within the cavity, can directly contact the insulating oil. The high dielectric strength and thermal conductivity of the insulating oil enhance the insulation performance and heat dissipation efficiency of the fuse body, preventing derating due to excessive temperature rise. This ensures the fuse body can meet higher rated current requirements with smaller specifications and dimensions, indirectly enhancing its voltage withstand capability. This allows the fuse's fusing action to better match the short-circuit curve, effectively protecting oil-immersed transformers and other electrical equipment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 An exploded structural diagram of an embodiment of the fuse assembly provided in this application;

[0029] Figure 2 A schematic diagram of the internal structure of an embodiment of the fuse assembly provided in this application;

[0030] Figure 3A partial structural schematic diagram of an embodiment of the fuse assembly provided in this application;

[0031] Figure 4 A schematic diagram of the cross-sectional structure of the seal in one embodiment of the fuse assembly provided in this application;

[0032] Figure 5 A three-dimensional structural schematic diagram of the seal in one embodiment of the fuse assembly provided in this application;

[0033] Figure 6 A schematic diagram of the assembly structure of the seal in one embodiment of the fuse assembly provided in this application;

[0034] Figure 7 A three-dimensional structural schematic diagram of an embodiment of the oil-immersed transformer provided in this application;

[0035] Figure 8 This is a schematic diagram of the internal structure of an embodiment of an oil-immersed transformer provided in this application;

[0036] Figure 9 This is a schematic diagram of the oil tank structure in one embodiment of the oil-immersed transformer provided in this application.

[0037] Explanation of icon numbers:

[0038] 1000. Fuse assembly;

[0039] 2000, Fuel tank; 2100, Top opening; 2200, Inner cavity; 2300, Tank cover; 2400, Flange; 2500, Lead wire through hole;

[0040] 3000, Corrugated heat dissipation device; 4000, Insulating sleeve; 5000, Outlet box;

[0041] 1. Fuse body; 11. Insulating transition component; 12. Fuse core structure;

[0042] 111. Threaded connection hole; 121. First conductive cover assembly; 122. Second conductive cover assembly; 123. Insulating cylinder; 124. Quartz sand layer; 125. Fuse wire;

[0043] 1211. Front cover; 1212. Front wiring terminal; 1213. Connecting bolts;

[0044] 1221. Rear cover; 1222. Rear wiring terminal;

[0045] 2. Mounting base; 21. Mounting surface;

[0046] 3. Sealing element; 31. Annular sealing ring; 311. Annular plane; 312. Annular arc surface;

[0047] 4. Handle; 41. First vertical connecting section; 42. Second vertical connecting section; 43. Horizontal gripping section; 431. Grip groove.

[0048] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0050] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0051] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0052] With the global energy structure shifting towards clean energy and the rapid development of the new energy industry, various electrical equipment, as core equipment adapted to the characteristics of new energy power generation and meeting the operational needs of new energy power systems, plays a crucial role in supporting the industry's development through its technical performance and design level. Currently, electrical equipment, represented by new energy transformers, is evolving towards larger capacity, higher efficiency, and lower losses. Simultaneously, in global applications, it must meet the transportation size requirements of standard shipping containers, which places higher demands on the structural design of electrical equipment.

[0053] However, increasing the capacity of existing electrical equipment often comes at the cost of increased size and weight. Their structural designs are not sufficiently streamlined or compact, which not only increases transportation and installation costs but also makes them difficult to adapt to the size restrictions of containers used in export scenarios, thus hindering the widespread application of high-capacity electrical equipment. Therefore, developing electrical equipment with streamlined structures and compact sizes has become a pressing technological need for the industry.

[0054] Those skilled in the art have discovered that, taking oil-immersed transformers as an example, existing electrical equipment generally employs oil-immersion insulation, which means that the core components of the electrical equipment, such as windings and iron cores, are placed inside the oil tank, immersing these core components in insulating oil. The insulating oil has high dielectric strength and excellent chemical stability, which can effectively isolate the core components from other devices, preventing short circuits or leakage and ensuring the electrical insulation reliability of the electrical equipment. At the same time, the heat generated by the core components during the operation of the electrical equipment can be naturally convectioned through the insulating oil and transferred to the side wall of the oil tank or radiator, and then efficiently dissipated through heat exchange with the outside air. This maintains the internal temperature of the electrical equipment within a reasonable range, avoiding problems such as insulation aging and component damage due to overheating.

[0055] Furthermore, existing oil-immersed transformers and other electrical equipment are also equipped with fuses. As a key protective component of electrical equipment, the core function of the fuse is to provide short-circuit and overload protection for the corresponding electrical connection circuits in the electrical equipment. When a short circuit or overload occurs in the electrical connection circuit due to insulation failure, external faults, or other reasons, causing the current flowing through the fuse to exceed the rated value, the fuse wire inside the fuse will melt rapidly due to the Joule heating effect. In this way, the electrical connection between the external leads and the corresponding components inside the electrical equipment (such as the high-voltage winding of the transformer) can be cut off by disconnecting the electrical connection circuit, so as to prevent the excessive current from continuously damaging the core components and prevent the fault range from expanding. This ensures the operational safety and reliability of the electrical equipment under complex operating conditions.

[0056] Since the aforementioned core components and related electrical connection circuits are all located within the inner cavity of the oil tank, the fuse also needs to be located within the inner cavity of the oil tank to facilitate connection to the relevant electrical connection circuits. To facilitate fuse removal and replacement, existing oil tanks typically have an installation opening on the vertical side wall, allowing the fuse to be inserted into or removed from the inner cavity of the oil tank through this opening. Furthermore, to prevent the insulating oil inside the oil tank from leaking out through this installation opening, a sleeve needs to be installed between the fuse and the installation opening. The sealing fit between the sleeve and the oil tank separates the fuse body from the insulating oil, thus preventing leakage of insulating oil from the installation opening during fuse body assembly and disassembly.

[0057] Based on the above setup, the presence of the sleeve will occupy additional internal space in the oil tank, increasing the overall structural complexity and size of the electrical equipment and hindering its compact design. Furthermore, the sleeve negatively impacts the insulation performance and heat dissipation efficiency of the fuse. Specifically, an air gap needs to be maintained between the sleeve and the fuse. Since the breakdown field strength of air is much lower than that of insulating oil, surface flashover can easily occur at this air gap when a short circuit occurs and the fuse blows, becoming a weak point in the overall insulation. Secondly, the low thermal conductivity of air and the additional thickness of the sleeve sidewall obstruct heat transfer from the fuse, leading to a significant increase in its temperature. To prevent premature fuse blowing or continued deterioration due to overheating, the rated current of the fuse needs to be reduced, i.e., the fuse must be dated. In the case of derating, to meet the original rated current requirement, the fuse's specifications and dimensions must be increased, further increasing the size of the electrical equipment and negatively impacting its simplification and compact design.

[0058] In response to the above problems and findings, this application proposes a fuse assembly that eliminates the sleeve while ensuring no leakage of insulating oil, allowing the fuse to directly contact the insulating oil. This reduces the size of electrical equipment, improves the simplification and compactness of the electrical equipment structure, and enhances the insulation performance and heat dissipation efficiency of the fuse by utilizing the high dielectric strength and high thermal conductivity of the insulating oil.

[0059] Please see Figure 1 and supplementary reference Figure 8 and Figure 9 An embodiment of this application provides a fuse assembly 1000, comprising:

[0060] Fuse body 1;

[0061] Mounting base 2 is connected to fuse body 1; mounting base 2 is used to be detachably assembled at the upper opening 2100 of oil tank 2000 so that fuse body 1 enters the inner cavity 2200 of oil tank 2000 from top to bottom, thereby allowing fuse body 1 to directly contact the insulating oil in the inner cavity 2200.

[0062] The sealing element 3 is disposed on the mounting base 2 and surrounds the fuse body 1. When the mounting base 2 is assembled at the upper opening 2100 of the oil tank 2000, the sealing element 3 is used to fit against the oil tank 2000 to prevent the insulating oil in the inner cavity 2200 from leaking outward.

[0063] In this embodiment, as Figure 8 and Figure 9As shown, the upper opening 2100 can be formed on the cover 2300 at the top of the oil tank 2000; the upper opening 2100 can be vertically through to achieve communication between the inner cavity 2200 of the oil tank 2000 and the outside. The inner cavity 2200 of the oil tank 2000 is filled with insulating oil, which is used to insulate and dissipate heat from the core components such as the windings and iron core in the inner cavity 2200.

[0064] Mounting base 2 can be configured as a plate structure. Mounting base 2 can be detachably connected to oil tank 2000 by means of threaded connection, snap-fit, riveting, etc. When mounting base 2 is connected and fixed on oil tank 2000, mounting base 2 can completely cover the upper opening 2100.

[0065] The fuse body 1 can refer to the part of the fuse assembly 1000 that is inserted into the inner cavity 2200 of the oil tank 2000 and provides fusing protection in the relevant electrical connection circuit. The fuse body 1 can be connected to the lower side of the mounting base 2 via a threaded connection or other means. When the mounting base 2 is closed from top to bottom at the upper opening 2100, the fuse body 1 can pass through the upper opening 2100 and enter the inner cavity 2200 of the oil tank 2000, allowing the fuse body 1 to directly contact the insulating oil in the inner cavity 2200. For example, Figure 8 and Figure 9 As shown, a flange 2400 can be installed on the top cover 2300 of the oil tank 2000 by means of welding or other methods. Multiple upper openings 2100 can be provided on the flange 2400 at intervals, and each upper opening 2100 is used to install a fuse assembly 1000.

[0066] The sealing element 3 can be a sealing ring, sealing strip, etc. The sealing element 3 can be fixed to the lower side of the mounting base 2 by snap-fit, adhesive, etc. The sealing element 3 is arranged around the fuse body 1. When the fuse body 1 moves from top to bottom through the upper opening 2100 and is installed into the inner cavity 2200 of the oil tank 2000, the sealing element 3 can fit against the upper side wall of the oil tank 2000, thereby forming a sealing strip around the upper opening 2100, which can prevent the insulating oil in the inner cavity 2200 from leaking out through the gap between the upper opening 2100 and the fuse body 1.

[0067] Therefore, in this embodiment, the opening for installing the fuse on the oil tank 2000 of existing oil-immersed transformers and other electrical equipment is moved from the vertical side wall to the top to form an upper opening 2100. This allows the fuse body 1 of the fuse assembly 1000 to be installed into the inner cavity 2200 of the oil tank 2000 through the upper opening 2100 in a vertical direction, and also allows the fuse body 1 to be removed from the inner cavity 2200 in a vertical direction. In other words, the existing side-mounted method is correspondingly changed to a top-mounted method; under the influence of gravity... The insulating oil in the inner cavity 2200 gathers downwards, so even if the fuse body 1 is removed from the inner cavity 2200, the insulating oil will not leak out through the upper opening 2100. Furthermore, in this embodiment, a sealing element 3 is provided on the mounting base 2 of the fuse assembly 1000. When the mounting base 2 is closed at the upper opening 2100 and the fuse body 1 is installed in the inner cavity 2200, the sealing element 3 can fit with the oil tank 2000 to form a seal, thereby ensuring that the insulating oil does not leak.

[0068] Based on the above settings, the risk of leakage of insulating oil can be eliminated during the disassembly and assembly of fuse assembly 1000. Thus, it is not necessary to use the sleeve in the existing solution to separate the fuse body 1 and the insulating oil, thereby eliminating the need for the sleeve. By eliminating the sleeve, on the one hand, the space occupied inside the oil tank 2000 can be reduced, thereby reducing the volume of the oil tank 2000 while maintaining the original performance. This makes the overall structure of electrical equipment such as oil-immersed transformers more streamlined and compact, reducing transportation and installation costs and better adapting to the container size restrictions in export scenarios. On the other hand, the fuse body 1 installed in the inner cavity 2200 can directly contact the insulating oil. Based on the high dielectric strength and high thermal conductivity of the insulating oil, the insulation performance and heat dissipation efficiency of the fuse body 1 can be improved, avoiding the need for derating treatment due to excessive temperature rise. In other words, it ensures that the fuse body 1 can meet the high rated current requirements with a smaller specification and size, thereby indirectly enhancing the voltage withstand capability of the fuse body 1. This allows the fuse body 1 to better match the short-circuit curve during fusing, thus providing effective protection for electrical equipment such as oil-immersed transformers.

[0069] In one embodiment, refer to Figure 1 and Figure 3 and supplementary reference Figure 8 and Figure 9 The fuse body 1 includes an insulating transition member 11 and a fuse core structure 12. The insulating transition member 11 extends along a first direction. The first end of the insulating transition member 11 is connected to the mounting base 2, and the second end of the insulating transition member 11 is connected to the fuse core structure 12.

[0070] When the mounting base 2 is assembled at the upper opening 2100 of the oil tank 2000, the insulating transition piece 11 is inserted into the upper opening 2100, and the fused core structure 12 is in direct contact with the insulating oil in the inner cavity 2200.

[0071] Specifically, with Figure 3 Taking the orientation shown as an example, the insulating transition member 11 can be configured as a columnar structure extending in the vertical direction. The upper end of the insulating transition member 11 can be connected to the mounting base 2 by means of threaded connection or the like, and the lower end of the insulating transition member 11 can be connected to the fused core structure 12 by means of threaded connection or the like.

[0072] The fuse core structure 12 can specifically refer to the part on the fuse body 1 that is directly connected to the relevant electrical connection circuit in the inner cavity 2200. Based on its fusing function, the fuse core structure 12 can cut off the electrical connection circuit in time under overload, short circuit and other conditions, so as to realize overload protection and short circuit protection for electrical equipment such as oil-immersed transformers.

[0073] By setting the insulating transition piece 11, on the one hand, the position of the fused core structure 12 can be lowered, ensuring that the fused core structure 12 can be fully immersed in the insulating oil, so as to make full use of the high dielectric strength and high thermal conductivity of the insulating oil to improve the insulation performance and heat dissipation efficiency of the fused core structure 12; on the other hand, the cross-sectional dimension of the insulating transition piece 11 can be set to be larger than the cross-sectional dimension of the fused core structure 12, and the cross-sectional dimension of the insulating transition piece 11 can be set to be adapted to the size of the upper opening 2100, thus ensuring that the fused core structure 12 can smoothly pass through the upper opening 2100. While being installed into the inner cavity 2200, the fuse assembly 1000 is positioned on the oil tank 2000 through the tight fit between the insulating transition piece 11 and the upper opening 2100, maintaining the positional stability of the fuse assembly 1000 after assembly. Furthermore, the insulating properties of the insulating transition piece 11 form a good insulating barrier at the junction of the fuse assembly 1000 and the upper opening 2100, thereby effectively preventing surface flashover and other problems at the relatively sensitive junction, ensuring the operational stability and reliability of the fuse assembly 1000.

[0074] The insulating transition component 11 can be made of epoxy resin. Epoxy resin has high dielectric strength and good mechanical properties, and can be integrally molded without seams. This ensures insulation performance while facilitating threaded processing, enabling threaded connections between the insulating transition component 11, the mounting base 2, and the fused core structure 12. Furthermore, epoxy resin is oil-resistant and heat-resistant, effectively preventing cracking and deformation under long-term high-temperature operation.

[0075] In one embodiment, refer to Figure 2 and Figure 3The fused core structure 12 includes a first conductive cover assembly 121, a second conductive cover assembly 122, an insulating cylinder 123, and a fuse 125. The first conductive cover assembly 121 covers one end of the insulating cylinder 123, and the second conductive cover assembly 122 covers the other end of the insulating cylinder 123. The first conductive cover assembly 121 is threadedly connected to the second end of the insulating transition member 11. The first conductive cover assembly 121 is used to connect the input section of the external lead, and the second conductive cover assembly 122 is used to connect the output section of the external lead. The insulating cylinder 123 is filled with a quartz sand layer 124, and the fuse 125 is encapsulated in the quartz sand layer 124. One end of the fuse 125 is connected to the first conductive cover assembly 121, and the other end of the fuse 125 is connected to the second conductive cover assembly 122.

[0076] In this embodiment, the first conductive cover assembly 121 may include a copper front cover 1211, which can be connected to the upper end of the insulating cylinder 123 by a threaded connection. A connecting bolt 1213 may be provided on the front cover 1211, and a threaded connection hole 111 may be correspondingly opened on the lower end face of the insulating transition member 11 to lock the connecting bolt 1213 in the threaded connection hole 111, thereby realizing the connection between the front cover 1211 and the insulating transition member 11. A conductive ring and a front terminal 1212 may be integrated on the front cover 1211. The front terminal 1212 constitutes the input end of the fuse assembly 1000 and is connected to the input segment of the external lead. One end of the fuse 125 in the insulating cylinder 123 can be connected to the front terminal 1212 through the conductive ring, thereby realizing the connection between the fuse 125 and the input segment of the external lead.

[0077] Similarly, the second conductive cover assembly 122 may include a copper rear cover 1221, which can be connected to the lower end of the insulating cylinder 123 by a threaded connection. A conductive ring and a rear terminal 1222 can be integrated on the rear cover 1221. The rear terminal 1222 constitutes the output end of the fuse assembly 1000. The rear terminal 1222 is connected to the output segment of the external lead. The other end of the fuse 125 in the insulating cylinder 123 can be connected to the rear terminal 1222 by the conductive ring, thereby realizing the connection between the fuse 125 and the output segment of the external lead.

[0078] Here, the external lead refers to the relevant electrical connection circuit that requires overload or short-circuit protection through the fuse assembly 1000, such as the high-voltage lead connected to a transformer. The input section of the external lead refers to the part of the electrical connection circuit that is externally connected to the input terminal of the fuse assembly 1000, and the output section of the external lead refers to the part of the electrical connection circuit that is led outward from the output terminal of the fuse assembly 1000. Based on the above configuration, the current can flow sequentially through the input section of the external lead, the fuse 125, and the output section of the external lead. When a short circuit or overload condition occurs, the fuse 125 will melt, thereby quickly cutting off the electrical connection between the input section and the output section of the external lead, thus providing protection.

[0079] The insulating cylinder 123 can be made of epoxy resin. Epoxy resin has high dielectric strength and good mechanical properties, and can be integrally molded without seams. This ensures insulation performance while facilitating operations such as drilling holes and machining threads on the insulating cylinder 123, enabling threaded connections between the insulating cylinder 123 and the first conductive cover assembly 121 and the second conductive cover assembly 122. Simultaneously, epoxy resin also has oil resistance and heat aging resistance, effectively preventing cracking and deformation under long-term high-temperature operation. The insulating cylinder 123 is filled with a quartz sand layer 124. The quartz sand layer 124 can rapidly absorb heat, divide the arc, and form a glassy seal at the moment the fuse 125 melts, achieving rapid arc extinguishing and suppressing reignition.

[0080] In one embodiment, refer to Figure 2 and Figure 3 The fuse assembly 1000 also includes a handle 4, which is disposed on the mounting base 2. Specifically, with Figure 3 Taking the orientation shown as an example, the handle 4 can be set on the upper side of the mounting base 2 so that the operator can move the fuse assembly 1000 up and down by grasping the handle 4, thereby conveniently and effortlessly inserting the fuse assembly 1000 into the inner cavity 2200 or taking it out of the inner cavity 2200.

[0081] In one embodiment, refer to Figure 3 The handle 4 includes a first vertical connecting section 41, a second vertical connecting section 42, and a horizontal gripping section 43. One end of the first vertical connecting section 41 is connected to the mounting base 2, and one end of the second vertical connecting section 42 is connected to the mounting base 2. The first vertical connecting section 41 and the second vertical connecting section 42 are spaced apart. One end of the horizontal gripping section 43 is connected to the other end of the first vertical connecting section 41, and the other end of the horizontal gripping section 43 is connected to the other end of the second vertical connecting section 42.

[0082] In this embodiment, the first vertical connecting section 41, the second vertical connecting section 42, and the horizontal gripping section 43 together form a U-shaped handle structure, which is more in line with the natural grip curve of the human hand. This ensures uniform force distribution when inserting or removing the fuse assembly 1000, reduces slippage, and makes the disassembly and assembly of the fuse assembly 1000 more effortless and safer.

[0083] In one embodiment, refer to Figure 3 The surface of handle 4 is provided with an anti-slip textured structure (not shown in the figure). The anti-slip textured structure can be used to increase friction and prevent the hand from slipping off handle 4, thereby further improving the stability and reliability of the operator when inserting and removing the fuse assembly 1000. The anti-slip textured structure can be set as a mesh textured structure.

[0084] In one embodiment, refer to Figure 3 The handle 4 is provided with at least two spaced-apart gripping grooves 431.

[0085] Specifically, the gripping grooves 431 can be set on the transverse gripping section 43 and arranged at intervals along the extension direction of the transverse gripping section 43. The number of gripping grooves 431 can be set according to the actual gripping situation. For example, four gripping grooves 431 can be set at intervals along the transverse direction so that the operator can attach the index finger, middle finger, ring finger and little finger to each gripping groove 431 in turn. This can improve the tightness of the fit between the operator's hand and the handle 4, thereby improving the stability of the operator when gripping the handle 4, and reducing the shaking and displacement of the fuse assembly 1000 relative to the hand during the insertion and removal of the fuse assembly 1000, thereby reducing the operator's fatigue and further optimizing the gripping experience.

[0086] In one embodiment, refer to Figure 3 The sealing element 3 is bonded and fixed to the surface of the mounting base 2.

[0087] In this embodiment, the sealing element 3 and the mounting base 2 are always bound together by an adhesive method, which can prevent the sealing element 3 from being lost. Furthermore, there is no need to set a mounting groove on the mounting base 2 for snapping and fixing the sealing element 3, thereby further simplifying the structure of the mounting base 2. It also eliminates the operation of inserting the sealing element 3 into the mounting groove during the assembly of the fuse assembly 1000, thereby improving the convenience and efficiency of installation.

[0088] In one embodiment, refer to Figure 3 and supplementary reference Figure 4 and Figure 5 The mounting base 2 has a mounting surface 21, and the fuse body 1 is connected to the mounting surface 21;

[0089] The sealing element 3 includes an annular sealing ring 31. The cross-sectional shape of the annular sealing ring 31 is formed by a straight segment and an arc segment. The straight segment surrounds the annular sealing ring 31 to form an annular plane 311, and the arc segment surrounds the annular sealing ring 31 to form an annular arc surface 312. The annular plane 311 is bonded and fixed to the mounting plane 21, and the annular arc surface 312 is used to fit with the oil tank 2000.

[0090] Specifically, with Figure 3 Taking the orientation shown as an example, the mounting plane 21 of the mounting base 2 is the lower side; the annular sealing ring 31 is arranged around the fuse body 1 around the vertical axis. The cross-sectional shape of the annular sealing ring 31 is formed by a straight line segment extending horizontally above and an arc segment below. The cross-sectional shape of the annular sealing ring 31 can be semi-circular or approximately semi-circular spherical crown-shaped; wherein, the straight line segment on the cross-section corresponds to the annular plane 311 at the upper part of the annular sealing ring 31, and the arc segment on the cross-section corresponds to the annular arc surface 312 at the lower part of the annular sealing ring 31. The annular plane 311 is horizontally arranged and fixed to the lower side of the mounting base 2 by adhesive bonding; when the mounting base 2 covers the upper opening 2100 of the oil tank 2000 from top to bottom, the annular arc surface 312 fits against the upper side of the oil tank 2000 to form a sealing strip around the upper opening 2100, which can prevent the insulating oil in the inner cavity 2200 from leaking outward through the gap between the upper opening 2100 and the fuse body 1.

[0091] like Figure 8 and Figure 9 As shown, a flange 2400 can be installed on the top cover 2300 of the oil tank 2000, and an upper opening 2100 is opened on the upper side of the flange 2400; when the fuse body 1 is installed into the inner cavity 2200 through the upper opening 2100, the annular arc surface 312 should fit against the upper side of the flange 2400.

[0092] In this embodiment, the annular sealing ring 31 has both an annular plane 311 and an annular arc surface 312. This allows for two advantages: firstly, the annular plane 311 increases the contact area between the annular sealing ring 31 and the mounting plane 21 of the mounting base 2, achieving a stable bond between the annular sealing ring 31 and the mounting base 2; secondly, the annular arc surface 312 better adapts to the different contour shapes of the sidewalls on the oil tank 2000. Figure 8 and Figure 9 Taking the flange 2400 as an example, regardless of whether the upper side of the flange 2400 is a flat surface or a curved surface with a certain curvature, the annular arc surface 312 of the annular sealing ring 31 can fit tightly with the upper side of the flange 2400, thereby reducing gaps and improving the sealing effect.

[0093] In one embodiment, refer to Figure 6The fuse assembly 1000 includes at least two seals 3, which are stacked sequentially from the inside to the outside in the radial direction.

[0094] Specifically, taking the fuse assembly 1000, which includes two seals 3, as an example, Figure 6 As shown, the smaller diameter seal 3 is arranged around the fuse body 1, and the larger diameter seal 3 is arranged around the smaller diameter seal 3. When the fuse body 1 is inserted into the inner cavity 2200 through the upper opening 2100, both seals 3 are in contact with the oil tank 2000, so that two sealing bands can be formed around the upper opening 2100, achieving a double sealing effect.

[0095] When the fuse assembly 1000 includes two or more seals 3, it can be similarly configured as described above to form multiple sealing strips around the upper opening 2100, thereby further improving the sealing effect.

[0096] In one embodiment, refer to Figure 2 The fuse body 1 is provided with a connecting screw hole (not shown in the figure), and the mounting base 2 is provided with a tapered through hole (not shown in the figure). The tapered through hole is set opposite to the connecting screw hole, and the diameter of the tapered through hole gradually increases in the direction away from the connecting screw hole.

[0097] The fuse assembly 1000 also includes a threaded connector that passes through a tapered through-hole and is locked into a connecting screw hole.

[0098] Specifically, when the fuse body 1 includes an insulating transition member 11, the connecting screw hole can be opened on the upper side of the insulating transition member 11. The number of connecting screw holes and tapered through holes can be set to one or more. After the mounting base 2 is placed on the upper side of the insulating transition member 11, the positions of the tapered through holes and connecting screw holes correspond one-to-one. At this time, threaded connectors such as bolts can be passed through the tapered through holes from top to bottom and locked into the connecting screw holes to achieve the connection and fixation between the mounting base 2 and the fuse body 1. The tapered through holes can guide the threaded connectors, allowing them to quickly align with the connecting screw holes and complete the installation.

[0099] This application also provides an oil-immersed transformer; please refer to [link / reference]. Figure 8 and Figure 9 The oil-immersed transformer includes an oil tank 2000 and a fuse assembly 1000 as described in any of the above embodiments;

[0100] The oil tank 2000 has an upper opening 2100, which communicates with the inner cavity 2200 of the oil tank 2000; the mounting base 2 of the fuse assembly 1000 is detachably mounted at the upper opening 2100, the sealing element 3 of the fuse assembly 1000 is in contact with the oil tank 2000, and the fuse body 1 of the fuse assembly 1000 is in direct contact with the insulating oil in the inner cavity 2200.

[0101] In this embodiment, the oil-immersed transformer is one type of electrical equipment described in the above embodiments. Specifically, an oil-immersed transformer is a power transformer in which the core, windings, and other electromagnetic components are immersed in insulating oil. The insulating oil serves both as an insulating medium and as a means to dissipate heat generated by the electromagnetic components and other related structures. Oil-immersed transformers possess excellent characteristics such as high voltage rating, large capacity, and low loss.

[0102] The specific structure of the fuse assembly 1000 can be referred to the above embodiments. Since this oil-immersed transformer adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments. That is, the opening for installing the fuse on the oil tank 2000 of the existing oil-immersed transformer is moved from the vertical side wall to the top to form an upper opening 2100. This allows the fuse body 1 of the fuse assembly 1000 to be installed into the inner cavity 2200 of the oil tank 2000 through the upper opening 2100 in a vertical direction, and the fuse body 1 to be removed from the inner cavity 2200 in a vertical direction. In other words, the existing... Some side-mounted designs are replaced with top-mounted designs. Under gravity, the insulating oil in the inner cavity 2200 gathers downwards. Even if the fuse body 1 is removed from the inner cavity 2200, the insulating oil will not leak out through the upper opening 2100. Furthermore, this application also provides a sealing element 3 on the mounting base 2 of the fuse assembly 1000. When the mounting base 2 is closed at the upper opening 2100 and the fuse body 1 is installed in the inner cavity 2200, the sealing element 3 can fit against the oil tank 2000 to form a seal, thereby ensuring that the insulating oil does not leak. Based on the above settings, the risk of insulating oil leakage can be eliminated during the disassembly and assembly of the fuse assembly 1000. Thus, it is not necessary to use the sleeve in the existing solution to separate the fuse body 1 and the insulating oil, thereby eliminating the need for the sleeve. By eliminating the sleeve, on the one hand, the space occupied inside the oil tank 2000 can be reduced, thereby reducing the volume of the oil tank 2000 while maintaining the original performance. This makes the overall structure of the oil-immersed transformer more streamlined and compact, reducing transportation and installation costs and better adapting to the container size restrictions in export scenarios. On the other hand, the fuse body 1 installed in the inner cavity 2200 can directly contact the insulating oil. Based on the high dielectric strength and high thermal conductivity of the insulating oil, the insulation performance and heat dissipation efficiency of the fuse body 1 can be improved, avoiding the need for derating treatment due to excessive temperature rise. In other words, it ensures that the fuse body 1 can meet the high rated current requirements with a smaller specification and size, thereby indirectly enhancing the voltage withstand capability of the fuse body 1. This allows the fuse body 1 to better match the short-circuit curve during fusing, thus providing effective protection for the oil-immersed transformer.

[0103] In one embodiment, refer to Figure 7 and Figure 8 At least one side wall of the oil tank 2000 is integrated with an elastic pleated structure (not shown in the figure); the elastic pleated structure expands outward during unfolding and contracts inward during folding to accommodate the volume change of the insulating oil in the inner cavity 2200.

[0104] In existing oil-immersed transformers, the insulating oil changes volume with temperature. Therefore, in order to provide sufficient expansion space for the insulating oil under high temperature conditions, a certain air gap needs to be reserved in the outer shell containing the insulating oil to accommodate the volume change of the insulating oil. However, the existence of the air gap leads to an increase in the volume of the outer shell used to contain the insulating oil, which is not conducive to the compact design of oil-immersed transformers.

[0105] Based on the above problems, this embodiment provides at least one sidewall of the oil tank 2000 with an elastic pleated structure. The elastic pleated structure refers to the turning points of components with undulating surfaces, such as wavy or serrated components. The presence of the elastic pleated structure allows the sidewall to undergo a certain degree of expansion and contraction under external force, increasing or decreasing its equivalent area. This allows the sidewall to expand outward or contract inward in the normal direction. Utilizing this characteristic, the sidewall with the elastic pleated structure can expand outward or contract inward in the normal direction according to the volume change of the insulating oil in the inner cavity 2200, flexibly adapting to changes in the volume of the insulating oil through its elastic deformation. Based on this design, no air gap is required in the inner cavity 2200 of the oil tank 2000, thus reducing the volume of the oil tank 2000 and further improving the overall structural simplicity and compactness of the oil-immersed transformer.

[0106] In one embodiment, refer to Figure 7 and Figure 8 At least one side wall of the fuel tank 2000 is integrated with a corrugated heat dissipation device 3000, which has a number of corrugated heat dissipation fins that form an elastic pleated structure.

[0107] In this embodiment, the corrugated heat sink of the corrugated heat sink device 3000 is directly used as an elastic pleated structure; the heat generated by the fuse assembly 1000 during operation can be conducted to the corrugated heat sink through the insulating oil, and then a good heat dissipation effect can be achieved through the heat exchange effect of the corrugated heat sink.

[0108] Based on the above configuration, while utilizing the elastic deformation capability of the corrugated heat sink to flexibly adapt to changes in the volume of the insulating oil, the heat dissipation effect of the oil-immersed transformer can also be improved simultaneously. Furthermore, the corrugated heat sink can be integrally bent into shape. The corrugated heat sink obtained by integral bending has high mechanical strength. Thus, the corrugated heat sink can be used as a reinforcing rib to strengthen the oil tank 2000, maintaining the structural strength of the oil tank 2000 while simplifying the internal reinforcing ribs.

[0109] In one embodiment, refer to Figure 8 and Figure 9The oil-immersed transformer also includes external leads (not shown in the figure); the fuse body 1 is connected to the external leads to divide the external leads into input and output sections;

[0110] The oil tank 2000 has a lead wire through hole 2500, which is connected to the inner cavity 2200. The input section passes through the lead wire through hole 2500. The oil-immersed transformer also includes an insulating bushing 4000, which is sleeved on the input section and is pluggably connected to the lead wire through hole 2500.

[0111] In this embodiment, the external lead can refer to the relevant electrical connection circuit that requires overload or short-circuit protection through the fuse assembly 1000, such as the high-voltage lead connected to a transformer. The input section of the external lead refers to the portion of the electrical connection circuit that is externally connected to the input terminal of the fuse assembly 1000, and the output section of the external lead refers to the portion of the electrical connection circuit that is led outward from the output terminal of the fuse assembly 1000. Based on the above configuration, the current can flow sequentially through the input section of the external lead, the fuse 125, and the output section of the external lead. When a short circuit or overload condition occurs, the fuse 125 will melt, thereby quickly cutting off the electrical connection channel between the input section and the output section of the external lead, thus providing protection.

[0112] The insulating bushing 4000 not only conveniently fixes the input section of the external lead to the tank 2000, but also provides insulation between the input section of the external lead and the lead through hole 2500. This eliminates the need for additional air clearance for the input section of the external lead, thereby further reducing the overall size of the tank 2000. Here, the insulating bushing 4000 can refer to a high-voltage bushing used on a transformer.

[0113] In one embodiment, refer to Figure 7 The oil-immersed transformer also includes a junction box 5000, which is located at the bottom of the oil tank 2000. The output section is led out to the outside through the junction box 5000.

[0114] For oil-immersed transformers, the output section of its external leads needs to be connected to low-voltage power distribution facilities such as low-voltage side cable trenches and busbar ducts below. Based on this, in this embodiment, the outlet box 5000 is set at the bottom of the oil tank 2000. In this way, the output section of the external leads can be directly led out from the bottom of the oil tank 2000 through the outlet box 5000, which can eliminate the need for copper busbars, brackets and other devices used to transfer the outgoing cables, thereby further saving materials and space, and is more conducive to the simplification and compact design of the overall structure of the oil-immersed transformer.

[0115] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A fuse assembly characterized by, The fuse assembly includes: Fuse body; Mounting bracket, which is connected to the fuse body; A seal is disposed on the mounting base and surrounds the fuse body.

2. The fuse assembly of claim 1, wherein, The fuse body includes an insulating transition member and a fuse core structure. The insulating transition member extends along a first direction, with a first end connected to the mounting base and a second end connected to the fuse core structure.

3. The fuse assembly of claim 2, wherein, The fused core structure includes a first conductive cover assembly, a second conductive cover assembly, an insulating cylinder, and a fuse. The first conductive cover assembly covers one end of the insulating cylinder, and the second conductive cover assembly covers the other end of the insulating cylinder. The first conductive cover assembly is threadedly connected to the second end of the insulating transition piece. The first conductive cover assembly is used to connect the input section of an external lead, and the second conductive cover assembly is used to connect the output section of an external lead. The insulating cylinder is filled with a layer of quartz sand, and the fuse is encapsulated in the quartz sand layer. One end of the fuse is connected to the first conductive cover assembly, and the other end of the fuse is connected to the second conductive cover assembly. And / or, the insulating transition element is made of epoxy resin.

4. The fuse assembly of claim 1, wherein, The fuse assembly also includes a handle disposed on the mounting base.

5. The fuse assembly of claim 4, wherein, The handle includes a first vertical connecting section, a second vertical connecting section, and a horizontal gripping section. One end of the first vertical connecting section is connected to the mounting base, and one end of the second vertical connecting section is connected to the mounting base. The first vertical connecting section and the second vertical connecting section are spaced apart. One end of the horizontal gripping section is connected to the other end of the first vertical connecting section, and the other end of the horizontal gripping section is connected to the other end of the second vertical connecting section. And / or, the surface of the handle is provided with an anti-slip textured structure; And / or, the handle is provided with at least two spaced-apart gripping grooves.

6. The fuse assembly of claim 1, wherein, The seal is bonded and fixed to the surface of the mounting base.

7. The fuse assembly of claim 6, wherein, The mounting base has a mounting plane, and the fuse body is connected to the mounting plane; the sealing element includes an annular sealing ring, the cross-sectional shape of which is formed by a straight segment and an arc segment, the straight segment surrounds the annular sealing ring to form an annular plane, and the arc segment surrounds the annular sealing ring to form an annular arc surface; the annular plane is bonded and fixed to the mounting plane; And / or, the fuse assembly includes at least two of the seals, which are stacked sequentially from the inside to the outside in the radial direction.

8. The fuse assembly of any one of claims 1 to 7, wherein, The fuse body is provided with a connecting screw hole, and the mounting base is provided with a tapered through hole. The tapered through hole is arranged opposite to the connecting screw hole, and the diameter of the tapered through hole gradually increases in the direction away from the connecting screw hole. The fuse assembly also includes a threaded connector that passes through the tapered through hole and is locked into the connecting screw hole.

9. An oil-immersed transformer, characterized in that, The oil-immersed transformer includes an oil tank and a fuse assembly as described in any one of claims 1 to 8; The oil tank has an upper opening that communicates with the inner cavity of the oil tank; the mounting base of the fuse assembly is detachably assembled at the upper opening, the seal of the fuse assembly is in contact with the oil tank, and the fuse body of the fuse assembly is in direct contact with the insulating oil in the inner cavity.

10. The oil-immersed transformer according to claim 9, characterized in that, The oil-immersed transformer also includes external leads; the fuse body is connected to the external leads to divide the external leads into an input section and an output section; The oil tank has a lead wire through hole, which communicates with the inner cavity, and the input section passes through the lead wire through hole; the oil-immersed transformer also includes an insulating bushing, which is sleeved on the input section and is pluggably connected to the lead wire through hole.

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