Transformer

Abstract

The invention relates to a transformer, and belongs to the technical field of oil-immersed transformers, the transformer comprises a transformer oil tank and a transformer body arranged in the transformer oil tank, a main oil conservator, an auxiliary oil conservator and an ascending flanged base are arranged above the transformer oil tank, the main oil conservator is communicated with the transformer oil tank, and the auxiliary oil conservator is arranged adjacent to an on-load tap-changer oil tank; the main oil conservator and the auxiliary oil conservator are of a combined structure and communicate with each other, the ascending flanged base comprises an upper barrel and a lower barrel which are detachably connected from top to bottom, the interior of the upper barrel is provided with a cavity for containing a current transformer, and the lower barrel is connected with a transformer oil tank so as to contain a lead. The technical problems that a connecting pipe between the auxiliary oil conservator and the on-load tap-changer is large in span, raw materials are wasted, leads are prone to being damaged in the transportation process of the transformer, and the installation process is tedious are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil-immersed transformers, and in particular relates to a transformer. Background Art

[0002] Oil-immersed transformers use a main and auxiliary oil pillow to store and replenish oil for the transformer and on-load tapchanger, respectively. The main oil pillow is a large pillow connected to the transformer body, while the auxiliary oil pillow is connected to the transformer's on-load tapchanger tank. The auxiliary and main oil pillows are typically combined to form a combined pillow, separated by a partition. The auxiliary and main pillows are connected to the transformer body and on-load tapchanger via separate oil outlets. Because the combined pillow and on-load tapchanger are located at opposite ends of the transformer's length, the span of the connecting pipe between the auxiliary oil pillow and on-load tapchanger is large, wasting raw materials. Furthermore, during transformer transportation, some leads are exposed outside the transformer tank, making them susceptible to damage from external impact or bending. Although the leads themselves have a certain degree of rigidity, they can still deform or even break when subjected to significant external forces, compromising subsequent installation and operational reliability. To address this issue, conventional wire protection blocks are often installed outside the transformer tank to provide temporary protection for the exposed leads during transportation, preventing them from bending or damage. However, in actual operation, after the transformer is transported to the site, the protective seat must be removed first, and then the rising seat assembly is installed, resulting in a cumbersome overall installation process and low work efficiency. Summary of the Invention

[0003] In view of the various shortcomings of the existing technology, a transformer is proposed to solve the technical problems in the existing technology that the main oil pillow and the auxiliary oil pillow adopt a combined structure, resulting in a large span of the connecting pipe between the auxiliary oil pillow and the on-load tap changer, wasting raw materials, and the leads are easily damaged during the transportation of the transformer, and the installation process is cumbersome.

[0004] To achieve the above object, the present invention provides the following technical solutions: A transformer comprises a transformer oil tank and a transformer body arranged inside the transformer oil tank, wherein a main oil pillow, a secondary oil pillow and an elevated seat are arranged above the transformer oil tank, wherein the main oil pillow is connected to the transformer oil tank, the secondary oil pillow is arranged adjacent to the on-load tap changer oil tank, and the two are connected, and the elevated seat comprises, from top to bottom, a detachably connected upper cylinder and a lower cylinder, wherein the interior of the upper cylinder is arranged as a cavity for accommodating a current transformer, and the lower cylinder is connected to the transformer oil tank to accommodate a lead.

[0005] The technical solution is further configured such that the main oil pillow is arranged along the length direction of the transformer oil tank, and is erected above the low-voltage bushing through the main oil pillow bracket. In the width direction of the transformer oil tank, part of the main oil pillow extends to the outside of the transformer oil tank.

[0006] The technical solution is further configured such that the auxiliary oil pillow is located at a corner of the transformer oil tank, and part of the auxiliary oil pillow extends to the outside of the transformer oil tank in the width and / or length direction of the transformer oil tank.

[0007] The technical solution is further configured such that an on-load tap changer gas relay is provided on the connecting pipeline between the auxiliary oil conservator and the on-load tap changer oil tank, and the auxiliary oil conservator is connected to a desiccant via a connecting pipeline.

[0008] The technical solution is further configured as follows: a maintenance cover detachably connected to the side wall of the transformer oil tank is provided, and an oil outlet and an oil return port are provided on the maintenance cover, and the oil outlet and the oil return port are connected to the oil tank oil quality detection equipment.

[0009] The technical solution is further configured as follows: an inspection hole is provided on the side wall of the transformer oil tank, a boss embedded in the inspection hole is provided on the inspection cover, and a sealing member is provided between the boss and the inspection hole.

[0010] The present technical solution is further configured such that an upper cylinder lower flange is provided at the bottom of the upper cylinder, the lower surface of the upper cylinder lower flange is at a height higher than the bottom of the upper cylinder to form a protrusion, and a lower cylinder upper flange is provided at the top of the lower cylinder, the upper surface of the lower cylinder upper flange is at a height higher than the top of the lower cylinder to form a recessed portion for the protrusion to be embedded in.

[0011] The technical solution is further configured such that the plane where the bottom of the lower cylinder is located is parallel to the plane where the top of the lower cylinder is located, or is inclined relative to the plane where the top of the lower cylinder is located.

[0012] The technical solution is further configured as follows: a positioning convex block is provided on the top of the transformer body, and a positioning groove block matching the positioning convex block is provided on the top plate of the transformer oil tank.

[0013] The technical solution is further configured as follows: a positioning piece is provided on the side of the transformer body, and a positioning plate for embedding the positioning piece is provided on the side wall of the transformer oil tank. The beneficial effects of the present invention are: 1. The auxiliary oil pillow is separated from the main oil pillow and installed near the oil tank of the on-load tap changer. This shortens the length of the connecting pipe between the auxiliary oil pillow and the oil tank of the on-load tap changer, avoids additional material waste, reduces costs, and solves the technical problem in the existing technology that the main oil pillow and the auxiliary oil pillow adopt a combined structure, resulting in a large span of the connecting pipe between the auxiliary oil pillow and the on-load tap changer, wasting raw materials.

[0014] 2. The lifting seat adopts a two-stage structure. The upper and lower cylinders are detachably connected, which solves the problem in the prior art that the leads are exposed to the outside of the transformer oil tank and are easily damaged during the transportation of the transformer. The lower cylinder can be used to protect the leads during transportation. During the installation process, there is no need to remove the lower cylinder and the upper cylinder can be directly installed, which simplifies the installation process.

[0015] 3. The oil outlet and return port are moved to the inspection cover. As an independent component, the inspection cover has significantly lower manufacturing and replacement costs than the transformer tank. If the oil outlet and / or return port are damaged, only the inspection cover needs to be replaced or repaired, without replacing the entire transformer tank, thus significantly reducing maintenance costs.

[0016] 4. By setting the positioning parts and positioning plates, the transformer body is positioned to improve stability; by setting the positioning protrusions and positioning grooves, the top plate of the transformer oil tank is installed and positioned to improve installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view of a transformer according to an embodiment of the present invention; Figure 2 is a side view of a transformer and a heat dissipation assembly according to an embodiment of the present invention; Figure 3 is a top view of the transformer and heat dissipation assembly according to an embodiment of the present invention; Figure 4 for Figure 1 Partial schematic diagram at point A in the middle; Figure 5 A schematic diagram of a raised seat according to an embodiment of the present invention; Figure 6 This is a schematic diagram of another embodiment of the lifting seat in the embodiment of the present invention; Figure 7 for Figure 5 Partial schematic diagram at point D in the middle; Figure 8 Schematic diagram of an inspection cover and a fuel tank oil quality detection device according to an embodiment of the present invention; Figure 9 is a schematic diagram of an access cover according to an embodiment of the present invention; Figure 10 is a longitudinal cross-sectional view of a sealing member according to an embodiment of the present invention; Figure 11 for Figure 1 Partial schematic diagram at point B in the middle; Figure 12 for Figure 1 Partial schematic diagram at point C in the middle.

[0018] In the accompanying drawings: 100, transformer oil tank; 200, transformer body; 300, main oil pillow; 400, auxiliary oil pillow; 500, riser; 501, upper cylinder; 502, lower cylinder; 503, cover; 504, upper cylinder flange; 505, upper cylinder lower flange; 506, lower cylinder flange; 507, casing cover; 600, inspection cover; 601, base; 602, first boss; 603, second boss; 604, oil outlet; 605, oil return port; 606, first sealing groove; 607, second sealing groove; 700, oil tank oil quality detection equipment; 8 00. Heat dissipation assembly; 900. Low-pressure bushing; 110. On-load tap-changer oil tank; 120. On-load tap-changer gas relay; 130. Rain cover; 140. First connecting pipeline; 150. Second connecting pipeline; 160. Oil outlet pipeline; 170. Oil return pipeline; 180. Seal; 1801. Main body; 1802. Protrusion; 190. Positioning protrusion; 210. Fixed edge; 220. Positioning groove block; 230. Positioning groove cover; 240. Positioning plate; 2401. Slot; 250. Positioning piece; 260. Positioning ear seat; 270. Bracket mounting seat. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only reference to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0020] According to an embodiment of the present invention, a transformer is provided. Figures 1 to 3 , including a transformer oil tank 100 and a transformer body 200 arranged inside the transformer oil tank 100, a main oil pillow 300, an auxiliary oil pillow 400 and a lifting seat 500 are arranged above the transformer oil tank 100, the main oil pillow 300 is connected to the transformer oil tank 100, and the auxiliary oil pillow 400 is arranged adjacent to the on-load tap changer oil tank 110, and the two are connected.

[0021] By separating the auxiliary oil pillow 400 from the main oil pillow 300 and installing the auxiliary oil pillow 400 at a position adjacent to the on-load tap changer oil tank 110, the length of the connecting pipe between the auxiliary oil pillow 400 and the on-load tap changer oil tank 110 is shortened, thereby avoiding additional material waste and reducing costs. This solves the technical problem in the prior art that the main oil pillow 300 and the auxiliary oil pillow 400 adopt a combined structure, resulting in a large span of the connecting pipe between the auxiliary oil pillow 400 and the on-load tap changer and wasting raw materials.

[0022] See also Figures 1 to 6 The rising seat 500 includes a detachably connected upper cylinder 501 and a lower cylinder 502 from top to bottom. The interior of the upper cylinder 501 is configured to accommodate a cavity for a current transformer, and the lower cylinder 502 is connected to the transformer oil tank 100 to accommodate leads.

[0023] By designing the lifting seat 500 as a two-section structure, with a detachably connected upper cylinder 501 and a lower cylinder 502, the problem in the prior art that the leads are exposed to the outside of the transformer oil tank 100 and are easily damaged during transportation of the transformer is solved. The lower cylinder 502 can be used to protect the leads during transportation, and during installation, there is no need to remove the lower cylinder 502, and the upper cylinder 501 can be directly installed, which simplifies the installation process.

[0024] In the transformer of this embodiment, please refer to Figures 1 to 3 Since the main oil pillow 300 has a large volume and a heavy overall weight, the main oil pillow 300 is arranged along the length direction of the transformer oil tank 100 to reduce the space it occupies.

[0025] Furthermore, the main oil conservator 300 is mounted above the low-voltage bushing 900 via a main oil conservator bracket, thereby reducing the overall height of the transformer.

[0026] Furthermore, heat dissipation components 800 are provided on both the front and rear sides of the transformer oil tank 100 to improve the overall heat dissipation efficiency of the transformer. In the width direction of the transformer oil tank 100, on the premise of ensuring the stability of the main oil pillow 300, part of the main oil pillow 300 extends to the outside of the transformer oil tank 100, that is, the main oil pillow 300 is arranged adjacent to the rear heat dissipation component. This structural design increases the effective volume of the main oil pillow 300 as much as possible, provides more space for the thermal expansion of the oil, and reduces the impact of pressure changes caused by temperature fluctuations on the system; at the same time, the position close to the heat dissipation component 800 usually has better ventilation conditions, which is conducive to maintaining the stability of the oil temperature inside the main oil pillow 300, thereby better coping with the problem of oil volume changes caused by temperature changes during operation.

[0027] In the transformer of this embodiment, please refer to Figures 1 to 4 The auxiliary oil pillow 400 is located at the corner of the transformer oil tank 100 and is arranged close to the heat dissipation component 800, which is conducive to maintaining the stability of the oil temperature inside the auxiliary oil pillow 400, thereby better coping with the problem of oil volume changes caused by temperature changes during operation.

[0028] Furthermore, the auxiliary oil pillow 400 is disposed above the auxiliary oil pillow bracket, the bottom of which is connected to the top plate of the transformer tank 100 via the bracket mounting base 270. The auxiliary oil pillow 400 has a relatively small volume, and a portion of the bracket mounting base 270 extends outside the transformer tank 100. That is, a portion of the bracket mounting base 270 is suspended in the air. This allows the auxiliary oil pillow 400 to partially extend outside the transformer tank 100 in the width and / or length directions. This avoids occupying excessive space on the top plate of the transformer tank 100, and avoids any additional increase in top plate area and transformer size due to the installation of the auxiliary oil pillow.

[0029] Furthermore, both the auxiliary oil conservator 400 and the main oil conservator 300 are equipped with oil level gauges for monitoring the remaining oil level. A rain shield 130 is installed above the oil level gauges to effectively prevent the effects of rain and other environmental factors. Especially in outdoor environments, weather changes can damage the oil level gauges or cause inaccurate readings. The rain shield protects the oil level gauges from direct rain, preventing electrical failures or other safety hazards caused by water entering the gauges, thereby ensuring their proper operation and extending their service life.

[0030] Specifically, the rain shield 130 is designed in an arcuate structure to create a space for the oil level gauge. This not only facilitates drainage and reduces the possibility of water accumulation, but also provides a relatively enclosed yet visible space for the oil level gauge. This design allows for convenient visual inspection even in inclement weather, without worrying about external conditions affecting the reading process.

[0031] In the transformer of this embodiment, please refer to Figures 1 to 4 An on-load tap changer gas relay 120 is provided on the first connecting pipe 140 between the auxiliary oil pillow 400 and the on-load tap changer oil tank 110. By providing the on-load tap changer gas relay 120, the content of harmful gases such as gas in the oil body is detected, and when the harmful gas exceeds the standard, the signal is connected or the trip circuit is tripped in time to achieve the purpose of protecting the transformer.

[0032] In the transformer of this embodiment, please refer to Figures 1 to 4 The auxiliary oil pillow 400 is connected to the desiccant through the second connecting pipe 150, and the desiccant is used to absorb excess moisture in the air inside the auxiliary oil pillow 400, thereby reducing humidity and protecting the transformer.

[0033] Furthermore, a liquid suction pipeline is provided inside the auxiliary oil pillow 400, and the suction end of the liquid suction pipeline is adjacent to the top of the auxiliary oil pillow 400, which can suck out the air located at the top of the auxiliary oil pillow 400, thereby giving full play to the role of the desiccant.

[0034] Specifically, the first connecting pipeline 140 and the auxiliary oil pillow 400 are connected, as is the second connecting pipeline 150 and the auxiliary oil pillow 400, via two butted flanges. A sealing ring is provided between the two butted flanges to improve sealing performance.

[0035] In the transformer of this embodiment, please refer to Figures 1 to 2 、 Figures 8 and 9 The transformer oil tank 100 has an inspection hole on its sidewall, with a detachably connected inspection cover 600 installed therein. The inspection cover 600 is provided with an oil outlet 604 and an oil return port 605, which are connected to the oil tank oil quality testing device 700. By relocating the oil outlet 604 and oil return port 605 to the inspection cover 600, the inspection cover 600, as a separate component, has significantly lower manufacturing and replacement costs than the transformer oil tank 100. If the oil outlet 604 and / or oil return port 605 become damaged, only the inspection cover 600 needs to be replaced or repaired, without having to replace the entire transformer oil tank 100, significantly reducing repair costs.

[0036] Furthermore, the oil outlet 604 is connected to the fuel tank oil quality testing device 700 via the oil outlet pipeline 160, which is equipped with an oil outlet control valve. The oil return port 605 is connected to the fuel tank oil quality testing device 700 via the oil return pipeline 170, which is equipped with an oil return control valve. The oil outlet control valve and the oil return control valve include, but are not limited to, switches such as ball valves and stop valves.

[0037] Specifically, a drainage tube extending into the interior of the transformer oil tank 100 can be provided at the oil outlet 604. The drainage tube can guide the sampling position to a position close to the center of the transformer oil tank 100 so as to be close to the transformer body 200, thereby avoiding affecting the detection accuracy due to poor flow of transformer oil at the sampling position.

[0038] In the transformer of this embodiment, please refer to Figures 1 to 2 、 Figures 8 to 10 The inspection cover 600 is provided with a boss embedded in the inspection hole, and a seal 180 is provided between the boss and the inspection hole. The provision of the seal improves the sealing effect and avoids transformer oil leakage.

[0039] Furthermore, the inspection cover 600 includes a base 601, with a primary boss 602 disposed on its surface. A secondary boss 603 is also disposed on the primary boss 602. Specifically, the secondary boss 603 is smaller than the primary boss 602, which in turn is smaller than the base 601. Accordingly, the sidewall of the transformer oil tank 100 is recessed inward to form a groove, the depth of which is less than the wall thickness of the transformer oil tank 100. The inspection hole is located at the bottom of the groove. The secondary boss 603 fits within the inspection hole, and their dimensions match. The primary boss 602 fits within the groove, and their dimensions match. A first sealing groove 606 is defined on the top surface of the primary boss 602 (the surface facing away from the base 601) and on the sidewall of the secondary boss 603. Correspondingly, a second sealing groove 607 is defined on the bottom of the groove and on the inner wall of the inspection hole. This dual-pass sealing structure improves sealing effectiveness.

[0040] Furthermore, seal 180 includes a body 1801, a protrusion 1802 extending away from the center of body 1801, and wings extending away from the center of body 1801. The wings and protrusion 1802 are located on the same side of body 1801. Body 1801 and the wings are located within first seal groove 606, correspondingly shaped to first seal groove 606. Protrusion 1802 is located within second seal groove 607, similarly shaped to second seal groove 607. By designing the structure of seal 180, the stability of its connection with first seal groove 606 is improved.

[0041] In the transformer of this embodiment, please refer to Figures 1 to 2 、 Figures 5 to 7 The bottom of the upper cylinder 501 is provided with an upper cylinder lower flange 505. The lower surface of the upper cylinder lower flange 505 is located at a height higher than the bottom of the upper cylinder 501, forming a protrusion. The top of the lower cylinder 502 is provided with a lower cylinder upper flange 506. The upper surface of the lower cylinder upper flange 506 is located at a height higher than the top of the lower cylinder 502, forming a recess for the protrusion to fit into. The height of the protrusion matches the depth of the recess. This design forms a slot-type connection structure, enhancing the stability and sealing of the connection between the upper cylinder 501 and the lower cylinder 502, and preventing shaking or displacement during use.

[0042] Furthermore, a cover plate 503 is detachably connected to the top of the upper cylinder 501. The cover plate 503 has an inner hole, an outer flange on the outer edge of the cover plate 503, and an inner flange on the inner edge of the cover plate 503. An upper flange 504 connected to the outer flange is located at the top of the upper cylinder 501. A sleeve cover plate 507 connected to the inner flange is located above the inner hole. The sleeve cover plate 507 covers the inner hole and is connected to the inner flange of the cover plate, providing protection and sealing for the inner hole.

[0043] Specifically, the top surface of the inner flange of the cover plate is lower than the top surface of the outer flange, forming a groove structure that limits the position of the sleeve cover plate 507. At the same time, it reduces the height of the sleeve cover plate 507 protruding from the upper surface of the cover plate 503, avoiding unnecessary height increase or safety hazards caused by excessive protrusion. When the sleeve is not installed, the sleeve cover plate 507 can seal the inner hole, preventing environmental contamination inside the riser, thereby improving the reliability of the equipment.

[0044] In the transformer of this embodiment, please refer to Figures 1 to 2 、 Figures 5 to 7 The bottom plane of the lower cylinder 502 can be parallel to the top plane, or tilted relative to the top plane, effectively increasing the safe distance between adjacent live terminals and contributing to stable transformer operation. It should be noted that when adopting a tilted design, the upper portion of the riser can still remain horizontal, ensuring the normal operation of the current transformer.

[0045] In the transformer of this embodiment, please refer to Figure 1 as well as Figure 11 The top of the transformer body 200 is provided with a positioning protrusion 190, and the top plate of the transformer oil tank 100 is provided with a positioning groove block 220 that matches the positioning protrusion 190. By providing the positioning protrusion 190 and the positioning groove block 220, the top plate of the transformer oil tank 100 is installed and positioned, improving installation efficiency.

[0046] Furthermore, a positioning groove is provided through the positioning groove block 220, into which the positioning protrusion 190 is inserted, allowing the position of the positioning protrusion 190 to be checked. The top of the positioning groove block 220 extends perpendicularly to the main body of the positioning groove block 220 to form a fixed edge 210, which is connected to the top plate of the transformer tank 100. A positioning groove cover plate 230 is provided above the fixed edge 210 and is detachably connected thereto.

[0047] Furthermore, multiple groups of positioning protrusions 190 and positioning grooves 220 are provided along the length direction of the transformer oil tank 100 .

[0048] In the transformer of this embodiment, please refer to Figure 1 as well as Figure 12 The transformer body 200 is provided with a positioning member 250 on its side, and a positioning plate 240 for embedding the positioning member 250 is provided on the side wall of the transformer oil tank 100. By providing the positioning member 250 and the positioning plate 240, the transformer body 200 is positioned and the stability is improved.

[0049] Furthermore, the positioning plate 240 is tilted relative to the sidewall of the transformer oil tank 100. The positioning plate 240 is provided with a slot 2401 with an opening. The positioning member 250 is inserted into the slot 2401 and locked by a locking member. The bottom of the positioning member 250 extends perpendicular to the body of the positioning member 250 to form a snap-in platform. The width of the snap-in platform is greater than the width of the slot 2401. Under the locking action of the locking member, the snap-in platform and the slot 2401 abut against each other. A positioning lug 260 is provided on the side of the transformer body 200. The positioning member 250 is mounted on the positioning mounting seat. A rotating shaft is provided between the positioning mounting seat and the positioning lug 260, enabling a rotatable connection between the positioning mounting seat and the positioning lug 260. This facilitates adjustment of the angle of the positioning member 250 and ensures smooth assembly with the positioning plate 240.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0052] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0053] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0054] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A transformer, comprising a transformer oil tank and a transformer body arranged inside the transformer oil tank, characterized in that: A main oil pillow, a secondary oil pillow and an elevated seat are arranged above the transformer oil tank. The main oil pillow is connected to the transformer oil tank. The secondary oil pillow is arranged adjacent to the on-load tap changer oil tank and the two are connected. The elevated seat includes a detachable upper cylinder and a lower cylinder from top to bottom. The interior of the upper cylinder is arranged to accommodate a cavity for accommodating a current transformer. The lower cylinder is connected to the transformer oil tank to accommodate the lead.

2. A transformer according to claim 1, characterized in that: The main oil pillow is arranged along the length direction of the transformer oil tank, and is erected above the low-voltage bushing through the main oil pillow bracket. In the width direction of the transformer oil tank, part of the main oil pillow extends to the outside of the transformer oil tank.

3. The transformer according to claim 1, characterized in that: The auxiliary oil pillow is located at the corner of the transformer oil tank, and part of the auxiliary oil pillow extends to the outside of the transformer oil tank in the width and / or length direction of the transformer oil tank.

4. A transformer according to claim 1 or 3, characterized in that: An on-load tap changer gas relay is provided on the connecting pipeline between the auxiliary oil conservator and the on-load tap changer oil tank, and the auxiliary oil conservator is connected to the desiccant via the connecting pipeline.

5. The transformer according to claim 1, characterized in that: The side wall of the transformer oil tank is provided with an inspection cover detachably connected thereto, the inspection cover is provided with an oil outlet and an oil return port, and the oil outlet and the oil return port are connected to the oil tank oil quality detection equipment.

6. A transformer according to claim 5, characterized in that: An inspection hole is provided on the side wall of the transformer oil tank, a boss embedded in the inspection hole is provided on the inspection cover, and a sealing member is provided between the boss and the inspection hole.

7. The transformer according to claim 1, characterized in that: The bottom of the upper cylinder is provided with an upper cylinder lower flange, and the height of the lower surface of the upper cylinder lower flange is higher than the height of the bottom of the upper cylinder to form a protrusion. The top of the lower cylinder is provided with a lower cylinder upper flange, and the height of the upper surface of the lower cylinder upper flange is higher than the height of the top of the lower cylinder to form a recessed portion for the protrusion to be embedded.

8. The transformer according to claim 7, characterized in that: The plane where the bottom of the lower cylinder is located is parallel to the plane where the top of the lower cylinder is located, or is inclined relative to the plane where the top of the lower cylinder is located.

9. The transformer according to claim 1, characterized in that: A positioning convex block is provided on the top of the transformer body, and a positioning groove block matching the positioning convex block is provided on the top plate of the transformer oil tank.

10. The transformer according to claim 1, characterized in that: A positioning piece is provided on the side surface of the transformer body, and a positioning plate for embedding the positioning piece is provided on the side wall of the transformer oil tank.

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