Adjustable transformer outgoing line structure for butt joint of SF6 totally-enclosed combined electric appliance

Abstract

The invention provides an adjustable transformer outgoing line structure in butt joint with an SF6 totally-enclosed composite apparatus, which comprises a flange, an ascending flanged base and a voltage-sharing ball, the ascending flanged base is installed on the top of an oil tank of the transformer. The flange is arranged on an oil-SF6 sleeve of the transformer in a sleeving mode and connected with one end of the ascending flanged base, and the voltage-sharing ball is installed in the oil-SF6 sleeve and connected with a lead of the transformer; the other end of the ascending flanged base is connected with an oil tank of the transformer. By adopting an adjustable wire outlet structure, fine adjustment can be carried out on site according to actual installation conditions, and accurate butt joint between the oil-SF6 sleeve and the SF6 totally-enclosed composite apparatus and the transformer is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of power transformer manufacturing, and relates to an adjustable transformer outlet structure connected to a SF6 fully enclosed combined electrical appliance. Background Art

[0002] As a vital device in the power system, the transformer undertakes the key tasks of voltage conversion and power transmission. Its long-term, stable and efficient operation is crucial to ensure the safety of the power grid. However, after years of operation, the transformer will gradually experience performance degradation or increased failure risks due to various reasons (such as insulation aging, component wear, material fatigue, and external environmental factors such as pollution, humidity, temperature changes, etc.). At this time, in order to ensure the reliability and safety of the power system, it becomes necessary to overhaul the transformer or directly retire and replace it.

[0003] Overhaul work usually includes inspection, cleaning, maintenance and replacement of key components of the transformer's internal structure. Among them, the outlet bushing, as a key component connecting the transformer to the external power grid, is often damaged or aged due to long-term exposure to high voltage, high current and harsh environmental conditions, and has become a common replacement object during overhaul. The replacement of the outlet bushing not only requires precise matching of the original electrical parameters, but also requires ensuring the sealing and insulation performance during the installation process to prevent safety hazards such as leakage and short circuit caused by improper installation.

[0004] When a transformer needs to be retired due to serious aging, high maintenance costs, or technological updates, the substation usually purchases a new transformer to replace it. The selection of a new transformer needs to comprehensively consider factors such as the substation's capacity requirements, voltage level, short-circuit current level, environmental protection requirements, and the possibility of future expansion. With the development of technology, modern transformer design pays more attention to energy efficiency improvement, the application of environmentally friendly materials, and the integration of intelligent monitoring functions to meet the growing power grid needs and sustainable development goals.

[0005] At present, many substations use SF6 (sulfur hexafluoride) fully enclosed combination electrical technology, which is a highly integrated and modular electrical equipment. It is widely used in high-voltage and ultra-high-voltage power systems for its excellent insulation performance, easy maintenance and low footprint. Compared with traditional overhead conductors, when SF6 fully enclosed combination electrical appliances are connected to transformer bushings, more stringent requirements are placed on the accuracy, cleanliness, coaxiality and sealing performance of the interface. This requires not only high-precision manufacturing processes and installation technologies, but also full consideration of factors such as thermal expansion and contraction, mechanical stress, etc. during the design and implementation process to ensure stability and reliability in long-term operation. Therefore, when overhauling or decommissioning transformers, compatibility and connection technology with SF6 (sulfur hexafluoride) fully enclosed combination electrical appliances become a link that must be highly valued. This requires power companies and related technical personnel to have deep professional knowledge, rich practical experience, and advanced detection and debugging methods to ensure the safe and efficient operation of the entire substation system.

[0006] However, in current technology, when replacing a transformer, there is a difference in the docking position of the new transformer and the old transformer, which makes it impossible to accurately locate and install the SF6 fully enclosed combination electrical appliance. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention provides an adjustable transformer outlet structure for connecting to SF6 fully enclosed combination electrical appliances, so that when replacing an old transformer, it can be smoothly connected to the original SF6 fully enclosed combination electrical appliances.

[0008] The present invention is achieved through the following technical solutions: An adjustable transformer outgoing line structure, comprising: Flange, riser seat and pressure equalizing ball; The elevated seat is installed on the top of the oil tank of the transformer; The flange is mounted on the oil-SF6 bushing of the transformer and connected to one end of the lifting seat. The pressure equalizing ball is installed in the oil-SF6 bushing and connected to the lead of the transformer. The other end of the lifting seat is connected to the oil tank of the transformer.

[0009] Preferably, an opening is provided on the side of the pressure equalizing ball; and the lead of the transformer is connected to the oil-SF6 bushing of the transformer through the side opening of the pressure equalizing ball.

[0010] Preferably, the flange is provided with a mounting hole for mounting an oil-SF6 bushing.

[0011] Preferably, the position of the mounting holes on the flange is adjusted according to the horizontal spacing L1 between the lead of the transformer and the SF6 fully enclosed switchgear, so that the oil-SF bushing of the transformer is positioned and connected to the SF6 fully enclosed switchgear.

[0012] Preferably, the horizontal distance L1 between the lead wire of the transformer and the SF fully enclosed switchgear is specifically: L1=L3-L2; Where: L1 is the horizontal distance between the transformer lead 6 and the SF6 fully enclosed combination electrical appliance, also known as the eccentric distance of the transformer oil-SF6 bushing on the elevated seat; L2 is the distance between the lead outlet position of the current transformer and the center line of the transformer foundation; L3 is the distance between the lead outlet position of the original transformer and the center line of the transformer foundation.

[0013] Preferably, the height H1 of the riser is adjusted according to the vertical spacing between the transformer oil-SF6 bushing and the installation interface of the SF6 fully enclosed combination electrical appliance.

[0014] Preferably, the height H1 of the adjusting raising seat is specifically: The height of the riser is H1 = H2-H3-H4; Where: H2 is the distance from the original SF6 fully enclosed combination electrical interface to the ground, H3 is the distance from the current transformer oil tank interface to the ground, and H4 is the distance between the upper flange and the lower flange of the current oil-SF6 bushing.

[0015] Preferably, the flange is respectively connected to the flange on the riser and the oil-SF6 bushing of the transformer through a bolt and nut set.

[0016] Preferably, the flange is an elliptical structure, the elevation seat is an elliptical cylindrical structure, and the elevation seat is made of steel.

[0017] A fully enclosed combined electrical appliance for connecting to SF6 based on an adjustable transformer outlet structure, wherein the adjustable transformer outlet structure is installed on the top of the transformer oil tank; the adjustable transformer outlet structure is respectively connected to the transformer oil-SF6 bushing and the transformer oil tank.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides an adjustable transformer outlet structure for docking with SF6 fully enclosed combination electrical appliances, the adjustable transformer outlet structure comprising a flange, an elevation seat and a voltage-equalizing ball; the elevation seat is installed on the top of the oil tank of the transformer; the flange is sleeved on the oil-SF6 bushing of the transformer and is connected to one end of the elevation seat, the voltage-equalizing ball is installed in the oil-SF6 bushing and is connected to the lead of the transformer; the other end of the elevation seat is connected to the oil tank of the transformer. By adopting an adjustable outlet structure, fine-tuning can be performed on site according to actual installation conditions to ensure accurate docking between the oil-SF6 bushing and the SF6 fully enclosed combination electrical appliance and the transformer. This design reduces installation errors caused by manufacturing tolerances or differences in on-site environments, and improves the overall stability and reliability of the system. Without changing the original SF6 fully enclosed combination electrical installation interface, by adjusting the height and horizontal position of the outlet device, docking solutions are provided for more types of transformer bushings and transformer bodies, which solves the problem that the base center of the transformer is fixed and the outlet positions of different transformer manufacturers are different in the prior art. By adjusting the inlet position of the equalizing ball in the oil-SF6 bushing and the eccentric size L1 and height size H1 of the rising seat for the outlet, the interface of the new transformer and the old transformer can be docked.

[0019] Furthermore, the adjustable lead-out structure can also ensure good contact between the lead wire 6 of the transformer and the oil-SF6 bushing, reduce contact resistance, and improve current transmission efficiency.

[0020] Furthermore, the adjustable transformer output structure provides a new solution for the mutual replacement of transformers from different manufacturers, which is particularly suitable for the maintenance and renovation of old substations.

[0021] Furthermore, the design of the voltage-equalizing ball helps to optimize the electric field distribution, reduce the risk of partial discharge, improve the electrical insulation performance of the system, and effectively prevent insulation damage caused by uneven electric field. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the main view of the installation of the adjustable transformer outgoing line structure; Figure 2 This is a top view of the installation of the adjustable transformer outgoing line structure; Figure 3 This is a schematic diagram of the oil-SF6 bushing structure; Figure 4 This is a schematic diagram of the installation structure of the oil-SF6 bushing and the riser; Figure 5 This is the adjustment relationship diagram between the flange and the riser seat; In the figure: oil-SF6 bushing 1, interface 2, flange 3, riser 4, pressure equalizing ball 5, lead 6, oil tank 7, SF6 fully enclosed combination appliance 8, upper flange 9, lower flange 10. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] An adjustable transformer output structure, such as Figure 1 and Figure 2 As shown, including, Flange 3, rising seat 4 and pressure equalizing ball 5; The raised seat 4 is installed on the top of the oil tank 7 of the transformer; The flange 3 is sleeved on the oil-SF6 bushing 1 of the transformer and connected to one end of the lifting seat 4. The pressure equalizing ball is installed in the oil-SF6 bushing 1 and connected to the lead 6 of the transformer; the other end of the rising seat 4 is connected to the oil tank 7 of the transformer.

[0026] The side of the voltage-equalizing ball 5 is provided with an opening; the lead wire 6 of the transformer is connected to the oil-SF6 bushing 1 of the transformer through the side opening of the voltage-equalizing ball 5 .

[0027] The flange 3 is provided with a mounting hole for mounting the oil-SF6 bushing 1. The flange 3 is an elliptical sheet structure, and a mounting hole of the same size as the outer diameter of the oil-SF6 bushing 1 is opened on the flange 3, which is used for the oil-SF6 bushing 1 to successfully pass through the flange. The flange 3 is provided with through holes around the mounting hole, which are used to achieve fixed installation with the flange on the oil-SF6 bushing 1. The installation is generally installed by bolt and nut assembly.

[0028] like Figure 5 As shown, according to the horizontal spacing L1 between the lead wire 6 of the transformer and the SF6 fully enclosed switchgear, the position of the mounting hole on the flange 3 is adjusted so that the oil-SF6 bushing 1 of the transformer and the SF6 fully enclosed switchgear are accurately positioned, installed and connected.

[0029] The horizontal distance L1 between the transformer lead 6 and the SF6 fully enclosed switchgear is specifically: L1=L3-L2; Wherein: L1 is the horizontal distance between the transformer lead 6 and the SF6 fully enclosed combination electrical appliance, also known as the eccentric distance of the transformer oil-SF6 bushing 1 on the riser 4; L2 is the distance between the lead outlet position of the current transformer and the center line of the transformer foundation; L3 is the distance between the lead outlet position of the original transformer and the center line of the transformer foundation.

[0030] By adjusting the position of the mounting holes on the flange, the oil-SF6 bushing of the transformer and the SF6 fully enclosed combination electrical appliance can be accurately docked, avoiding poor connection or leakage problems caused by installation errors. Accurate docking can reduce the adjustment and correction work during the installation process, thereby simplifying the installation process and improving installation efficiency. By adjusting the position of the mounting holes on the flange, it is possible to flexibly adapt to the needs of different horizontal spacings L1 and optimize the layout and space utilization of the equipment. According to the horizontal spacing L1 between the lead wire 6 of the transformer and the SF6 fully enclosed combination electrical appliance, the position of the mounting holes on the flange 3 is adjusted to achieve the precise positioning, installation and connection of the oil-SF6 bushing 1 of the transformer and the SF6 fully enclosed combination electrical appliance, which has the beneficial effects of improving installation accuracy and efficiency, enhancing the reliability of equipment operation, optimizing equipment layout and space utilization, and ensuring personnel safety and operation convenience. These effects jointly improve the stability and safety of the power system and provide a strong guarantee for the stable operation of the power system.

[0031] like Figure 5 As shown, the height H1 of the riser 4 is adjusted according to the vertical distance between the transformer oil-SF6 bushing 1 and the SF6 fully enclosed combination electrical installation interface 2.

[0032] The height H1 of the raised seat 4 is adjusted as follows: The height of the riser is H1 = H2-H3-H4; In the formula: H2 is the distance from the original SF6 fully enclosed combination electrical interface to the ground, H3 is the distance from the current transformer oil tank interface to the ground, and H4 is the distance between the upper flange and the lower flange of the current oil-SF6 bushing 1. The base center of the transformer is fixed, and the outlet position of different transformer manufacturers is different. By adjusting the inlet position of the equalizing ball 5 in the oil-SF6 bushing 1 and the eccentric size L1 and height size H1 of the riser 4 for the outlet, the new transformer can be docked with the old interface.

[0033] By adjusting the height of the riser, the installation interface of the transformer oil-SF6 bushing and the SF6 fully enclosed combination appliance can be precisely docked in the vertical direction. This avoids installation difficulties or poor connections caused by improper vertical spacing and optimizes the installation process. Adjusting the height of the riser can adapt to different installation environments and conditions, such as different ground heights, equipment layouts, etc. This flexibility enables the equipment to be used in a wider range of environments, improving the versatility and adaptability of the equipment.

[0034] The flange 3 is connected to the flange on the lifting seat 4 and the oil-SF6 bushing of the transformer respectively. The flange 3 is connected to the lifting seat 4 through a bolt and nut set. The size of the flange 3 is adapted to the lifting seat 4, and a through hole is provided at the installation position of the lifting seat 4 for connection with the bolt and nut set; The cross section of the lifting seat 4 is an elliptical structure, a cylindrical structure, and through holes are arranged around the edges of the upper and lower ends. One end is used for fixed connection with the flange 3, and the other end is used for fixed connection with the oil tank 7 of the transformer through a bolt and nut set. The lifting seat 4 is generally made of steel and prepared. The bottom of the lifting seat 4 is provided with an operation hole for installing the equalizing ball and the lead wire; A fully enclosed SF6 combined electrical appliance for docking based on an adjustable transformer outlet structure, wherein the adjustable transformer outlet structure is installed on the top of the transformer oil tank 7; the adjustable transformer outlet structure is connected to the transformer oil-SF6 bushing 1 and the transformer oil tank 7 respectively. The flange 3 of the adjustable transformer outlet structure is sleeved on the transformer oil-SF6 bushing 1 and connected to one end of the raised seat 4 of the adjustable transformer outlet structure, and the equalizing ball 5 of the adjustable transformer outlet structure is installed in the oil-SF6 bushing 1 and connected to the transformer lead 6; the other end of the raised seat 4 of the adjustable transformer outlet structure is connected to the transformer oil tank 7. By adopting the adjustable outlet structure, fine-tuning can be performed on site according to actual installation conditions to ensure accurate docking between the oil-SF6 bushing and the SF6 fully enclosed combined electrical appliance and the transformer. This design reduces installation errors caused by manufacturing tolerances or differences in on-site environments, and improves the overall stability and reliability of the system. Flexibility means that more uncertainties can be accommodated during the installation process, such as uneven ground and slight differences in equipment size, without requiring large-scale modifications or adjustments to the transformer or.

[0035] The design of the voltage grading ball 5 helps to optimize the electric field distribution, reduce the risk of partial discharge, and improve the electrical insulation performance of the system. This is particularly important for high-voltage and ultra-high-voltage power systems, and can effectively prevent insulation damage caused by uneven electric fields.

[0036] The adjustable lead-out structure can also ensure good contact between the transformer lead 6 and the oil-SF6 bushing, reduce contact resistance, and improve current transmission efficiency.

[0037] The connection design of the flange 3 and the riser 4, as well as their close fit with the transformer oil tank 7 and the oil-SF6 bushing 1, help to achieve a good sealing effect, prevent SF6 gas leakage, and ensure the insulation performance and operational safety of the SF6 fully enclosed combination electrical appliance.

[0038] The design of the adjustable outlet structure also takes into account future maintenance needs, allowing for easy disassembly and reassembly when necessary, reducing maintenance costs and time.

[0039] As the power system develops, substations may need to be upgraded or expanded. The design of the adjustable outgoing line structure allows the connection between the transformer and the SF6 fully enclosed combined electrical appliance to flexibly adapt to future changes, such as adding new outgoing line circuits or changing voltage levels. This design also helps to reduce the power outage time and impact caused by system upgrades, and improves the availability and reliability of the power system.

[0040] The design of the adjustable outgoing line structure helps promote the standardization and modularization of transformers and SF6 fully enclosed switchgear, making it easier for equipment from different manufacturers to achieve interoperability. Standardization and modularization help reduce manufacturing costs, improve production efficiency, and promote technological innovation and industrial upgrading.

[0041] like Figure 3 and Figure 4 As shown, an upper flange 9 and a lower flange 10 are provided on the oil-SF6 bushing 1, and the upper flange 9 is fixedly connected to the interface 2 of the butt SF6 fully enclosed combined electrical appliance; the lower flange 10 is fixedly connected to the flange 3; through holes are provided in the circumferential direction of the edges of the upper flange 9 and the lower flange 10 for connection of bolt and nut groups; Oil-SF6 bushing is a special electrical bushing, one end of which is immersed in sulfur hexafluoride gas and the other end is immersed in insulating oil medium. It is mainly used to connect the high-voltage live conductor of SF6 gas-insulated enclosed switchgear to the high-voltage lead of oil-insulated transformer.

[0042] Because the parameters of each transformer are different, and the design scheme of each transformer manufacturer is also different, when replacing the old transformer with the new one, it is necessary to accurately locate the interface flange position of the transformer oil-SF6 bushing to reduce the adjustment of the SF6 fully enclosed combination electrical appliance. Usually, the transformer oil-SF6 bushing and the riser are installed as a whole on the top of the transformer oil tank 7; The interface and length of the oil-SF6 bushing of the transformer are designed according to IEC and GB standards, with strong versatility; In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there can also be a central component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a central component at the same time. When a component is considered to be "set on" another component, it can be directly set on the other component or there can be a central component at the same time.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0047] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0048] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0049] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0050] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0051] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. An adjustable transformer outgoing line structure, characterized in that: include, Flange (3), rising seat (4) and pressure equalizing ball (5); The raised seat (4) is installed on the top of the oil tank (7) of the transformer; The flange (3) is sleeved on the oil-SF6 bushing (1) of the transformer and is connected to one end of the lifting seat (4); the pressure equalizing ball is installed in the oil-SF6 bushing (1) and is connected to the lead wire (6) of the transformer; the other end of the lifting seat (4) is connected to the oil tank (7) of the transformer.

2. The adjustable transformer outgoing line structure according to claim 1, characterized in that: The side surface of the voltage-equalizing ball (5) is provided with an opening; the lead wire (6) of the transformer is connected to the oil-SF6 bushing (1) of the transformer through the side opening of the voltage-equalizing ball (5).

3. The adjustable transformer outgoing line structure according to claim 1, characterized in that: The flange (3) is provided with a mounting hole for mounting the oil-SF6 bushing (1).

4. The adjustable transformer outgoing line structure according to claim 3, characterized in that: According to the horizontal distance L1 between the lead wire (6) of the transformer and the SF6 fully enclosed combination electrical appliance, the position of the mounting hole on the flange (3) is adjusted so that the oil-SF (6) bushing (1) of the transformer and the SF6 fully enclosed combination electrical appliance are positioned and connected.

5. The adjustable transformer outgoing line structure according to claim 4, characterized in that: The horizontal distance L1 between the transformer lead (6) and the SF (6) fully enclosed switchgear is: L1=L3-L2; Wherein: L1 is the horizontal distance between the transformer lead 6 and the SF6 fully enclosed switchgear, also known as the eccentric distance of the transformer oil-SF6 bushing (1) on the riser (4); L2 is the distance between the lead outlet position of the current transformer and the center line of the transformer foundation; L3 is the distance between the lead outlet position of the original transformer and the center line of the transformer foundation.

6. The adjustable transformer outgoing line structure according to claim 1, characterized in that: Adjust the height H1 of the riser (4) according to the vertical distance between the transformer oil-SF6 bushing (1) and the SF6 fully enclosed combination electrical installation interface (2).

7. The adjustable transformer outgoing line structure according to claim 6, characterized in that: The height H1 of the adjusting raising seat (4) is specifically: The height of the riser is H1 = H2-H3-H4; Where: H2 is the distance from the original SF6 fully enclosed combination electrical interface to the ground, H3 is the distance from the current transformer oil tank interface to the ground, and H4 is the distance between the upper flange and the lower flange of the current oil-SF6 bushing (1).

8. The adjustable transformer outgoing line structure according to claim 1, characterized in that: The flange (3) is respectively connected to the raised seat (4) and the flange on the oil-SF6 bushing of the transformer through a bolt and nut set.

9. The adjustable transformer outgoing line structure according to claim 1, characterized in that: The flange (3) is an elliptical structure, the raised seat (4) is an elliptical cylindrical structure, and the raised seat (4) is made of steel.

10. A SF6 fully enclosed combined electrical appliance based on an adjustable transformer outlet structure, based on the adjustable transformer outlet structure according to any one of claims 1 to 9, characterized in that: The adjustable transformer outgoing wire structure is installed on the top of the transformer oil tank (7); the adjustable transformer outgoing wire structure is connected to the transformer oil-SF6 bushing (1) and the transformer oil tank (7) respectively.

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