Horizontal transverse arrangement structure for oil sleeve of large power transformer

Abstract

The invention relates to the technical field of transformers, and discloses a large power transformer oil sleeve horizontal transverse arrangement structure which comprises a splicing type integral bus box. An oil-oil casing; a conducting integrated pipeline is externally arranged; a support frame; according to the invention, the high 220Kv-grade high-pressure oil sleeve is horizontally arranged, so that the problems of high volume and heavy weight of the transformer can be effectively solved, and meanwhile, as the internal lead does not span a cabin, the clamping support of an insulating consumable at the connecting part of the internal lead in the background problem is canceled, and the working efficiency is improved. An insulating cylinder at the tail of an internal sleeve in the background problem is canceled through special treatment of additionally covering an insulating layer on a voltage-sharing ball at the tail of the sleeve, integrated oil injection and drainage of a transformer body and an overall bus box are achieved through arrangement of an external conduction pipeline and a valve, oil drainage can be conducted only for an overhaul area during oil drainage overhaul, and the oil drainage efficiency is improved. The overall oil drainage amount can be effectively reduced, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, and more particularly to a horizontally placed structure of oil bushings for large power transformers. Background Art

[0002] When the transformer uses oil-oil bushing, the 220KV grade high-voltage bushing is mostly placed vertically or tilted. In order to avoid the high-voltage bushing equalizing ball discharging to the ground potential during power frequency and impact tests, an insulating paper tube is set outside the bushing equalizing ball to ensure the insulation distance between the bushing end and the ground potential corner. However, transformers with oil-oil bushing arranged in this way often have the following problems:

[0003] 1. High volume and heavy weight;

[0004] 2. The internal lead connection needs to be equipped with a clamping and fixed insulating component and other consumable insulating materials;

[0005] 3. An insulating paper tube needs to be installed at the tail of the internal casing;

[0006] This also results in the oil-oil bushing structure used in conventional transformers not only being complex in structure, but also difficult to produce, install and maintain.

[0007] In order to solve the above problems, it is urgent to develop a horizontal oil-oil bushing structure for large power transformers. Summary of the invention

[0008] The purpose of the present invention is to provide a horizontally placed structure for oil bushings of large power transformers in order to solve the above problems.

[0009] The present invention provides a horizontally placed structure for oil bushings of large power transformers, comprising:

[0010] A spliced ​​integral bus box, the spliced ​​integral bus box comprising a proximal bus box connected to a transformer body, a CT end bus box connected to the other end of the proximal bus box, a flange connected to the other end of the CT end bus box, and a distal bus box connected to the flange, an independent chamber 1 is formed between the proximal bus box, the CT end bus box, the flange and the transformer body, an independent chamber 2 is formed between the flange and the distal bus box, and a valve is provided at a position near the other end of the distal bus box;

[0011] The oil-oil casing is horizontally connected in the middle of the flange, one end of which is in the independent chamber 1, and the other end of which is in the independent chamber 2, and both ends of the oil-oil casing are provided with a pressure equalizing ball to increase the insulation layer;

[0012] An external conductive integrated pipeline, which is located outside the spliced ​​integral busbar box and is used to connect the independent chamber 1 and the independent chamber 2;

[0013] A support frame is connected between the spliced ​​integral bus box and the transformer body, and is used to provide a support force of a set value for the spliced ​​integral bus box.

[0014] As a further optimization solution of the present invention, an operating hand hole 1 is provided on the proximal busbar box, and the operating hand hole 1 is located directly above one end of the oil casing.

[0015] As a further optimization scheme of the present invention, the remote bus box is provided with operating hand hole 2 and operating hand hole 3, the operating hand hole 2 is located directly above the other end of the oil casing, the operating hand hole 3 is located directly above the valve, and the operating hand hole 2 and the operating hand hole 1 are both provided with vent plugs.

[0016] As a further optimization solution of the present invention, the remote busbar box is provided with an oil drain area adjustment mechanism, and the oil drain area adjustment mechanism is located between the other end of the oil casing and the operating hand hole three;

[0017] The oil discharge area regulating mechanism comprises an expansion partition assembly connected to the inner wall of the remote bus box, a one-way pump air assembly connected to the outer wall of the remote bus box, and a reset assembly connected to the one-way pump air assembly, wherein the reset assembly is connected to the expansion partition assembly through the one-way pump air assembly, the one-way pump air assembly is used to introduce gas into the expansion partition assembly in one direction, and the reset assembly is used to discharge the gas in the expansion partition assembly;

[0018] When the one-way pump air assembly introduces a set amount of gas into the expandable partition assembly in one direction, the expandable partition assembly is used to separate the space in the remote bus box into an upper chamber and a lower chamber, and the three operating hand holes and the valve are both connected to the lower chamber.

[0019] As a further optimization scheme of the present invention, the expandable partition assembly includes an annular baffle plate fixedly connected to the inner wall of the remote bus box, an annular threading tube fixedly connected to the inner ring surface of the annular baffle plate, an annular air bag connected to the inner ring surface of the annular threading tube, and a channel one connected to the annular air bag, wherein the channel one passes through the annular threading tube, the annular baffle plate and the remote bus box in sequence, and the other end of the channel one is connected to the one-way pump air assembly.

[0020] As a further optimization scheme of the present invention, the one-way air pumping assembly includes a telescopic air pumping assembly and a multi-directional air guide assembly connected to the outer wall of the remote bus box, and the telescopic air pumping assembly and the reset assembly are both connected to the expandable partition assembly through the multi-directional air guide assembly.

[0021] As a further optimization scheme of the present invention, the telescopic pump air assembly includes a fixed plate fixedly connected to the outer wall of the remote bus box, an elastic telescopic rod connected to the fixed plate, a movable plate connected to the other end of the elastic telescopic rod, a bellows connected between the fixed plate and the movable plate, a slot one provided on the fixed plate, an air guide plate connected to the opening end of the slot one, a plurality of air holes one provided on the air guide plate, a plastic sealing sheet one connected to the end surface of the air hole one located inside the slot one, a slot two and a plurality of air holes two provided on the movable plate, and a plastic sealing sheet two connected to the inner wall of the slot two, a sealed pump air chamber is formed between the fixed plate, the movable plate and the bellows, the plastic sealing sheet one covers a plurality of air holes one, and only one end thereof is fixedly connected to the air guide plate, the plastic sealing sheet two covers a plurality of air holes two, and only one end thereof is fixedly connected to the inner wall of the slot two;

[0022] When the internal space of the moving plate gradually decreases, positive pressure is generated inside the air chamber of the sealing pump, and the air hole 1 and the air hole 2 are in the open state and the closed state respectively;

[0023] When the internal space of the moving plate gradually recovers, a positive pressure is generated inside the air chamber of the sealing pump, and the air hole 1 and the air hole 2 are in a closed state and an open state respectively.

[0024] As a further optimization scheme of the present invention, the multi-directional air guide assembly includes an air guide tube fixedly connected to slot one and a three-way joint connected to the outer wall of the remote bus box, one end of the air guide tube is connected to slot one, and the other end thereof is connected to channel one through the three-way joint.

[0025] As a further optimization scheme of the present invention, the reset assembly includes an exhaust pipe connected to a three-way joint, a stepped channel arranged inside the exhaust pipe, a spring and a stepped piston arranged in the stepped channel, a pressure rod connected to the stepped piston, and a handle connected to the pressure rod; when the spring is shortened to a set length, the stepped channel is connected to channel one through the three-way joint.

[0026] The beneficial effects of the present invention are as follows: the present invention can effectively solve the problems of high volume and heavy weight of the transformer by placing the 220Kv grade high-voltage oil bushing horizontally; at the same time, since the internal lead does not cross the cabin, the clamping support of the insulating consumables at the connection of the internal lead in the background problem is eliminated; the insulating tube at the tail of the internal bushing in the background problem is eliminated through the special treatment of increasing the insulating layer by the equalizing ball at the tail of the bushing; the integrated filling and draining of the transformer body and the integral bus box is realized by setting the external conducting pipeline and valve; when draining the oil for maintenance, the oil can be drained only in the maintenance area, which can effectively reduce the overall oil draining amount and improve the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a diagram showing the matching of the oil drain area adjustment mechanism and the remote bus box of the present invention;

[0029] Figure 3 The present invention Figure 2 Magnified view at A in the middle;

[0030] Figure 4 The present invention Figure 2 Magnified view at B in the middle;

[0031] Figure 5 The present invention Figure 2 Enlarged view at center C;

[0032] Figure 6 The present invention Figure 2 Magnified view at D in the middle;

[0033] Figure 7 It is a structural schematic diagram of the external conductive integrated pipeline of the present invention;

[0034] Figure 8 It is a schematic diagram comparing the present invention with a transformer adopting a vertical oil-oil bushing method.

[0035] In the figure: 1. Near-end busbar box; 2. CT-end busbar box; 201. Flange; 3. Far-end busbar box; 4. Oil-oil casing; 5. External conduction integrated pipeline; 601. Operation hand hole 1; 602. Operation hand hole 2; 603. Operation hand hole 3; 7. Air release plug; 8. Pressure equalizing ball with insulation layer; 9. Oil release area adjustment mechanism; 91. Inflatable partition assembly; 9101. Annular baffle plate; 9102. Annular threading barrel; 9103. Annular air bag; 9104. Channel 1; 92. One-way pump air assembly; 9201. Fixing plate; 9202. Movable plate; 9203, bellows; 9204, elastic telescopic rod; 9205, slot one; 9206, air guide plate; 9207, air hole one; 9208, plastic sealing sheet one; 9209, slot two; 9210, air hole two; 9211, plastic sealing sheet two; 9212, air guide pipe; 9213, three-way connector; 93, reset assembly; 9301, exhaust pipe; 9302, stepped channel; 9303, spring; 9304, stepped piston; 9305, pressure rod; 9306, handle; 10, valve; 11, support frame. DETAILED DESCRIPTION

[0036] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only intended to enable those skilled in the art to better understand and implement the subject matter described herein. In addition, the features described relative to some examples may also be combined in other examples.

[0037] Example 1

[0038] like Figure 1 and Figure 7 As shown, a horizontally placed structure for oil bushings of large power transformers comprises:

[0039] The spliced ​​integral bus box comprises a proximal bus box 1 connected to the transformer body, a CT end bus box 2 connected to the other end of the proximal bus box 1, a flange 201 connected to the other end of the CT end bus box 2, and a distal bus box 3 connected to the flange 201. An independent chamber 1 is formed between the proximal bus box 1, the CT end bus box 2, the flange 201 and the transformer body, an independent chamber 2 is formed between the flange 201 and the distal bus box 3, and a valve 10 is provided at a position near the other end of the distal bus box 3;

[0040] The oil-oil casing 4 is horizontally connected in the middle of the flange 201, one end of which is in the independent chamber 1, and the other end of which is in the independent chamber 2, and both ends of the oil-oil casing 4 are provided with a voltage-equalizing ball with an insulating layer 8; the voltage-equalizing ball at the tail end and the top end of the oil-oil casing 4 are only treated with an insulating layer, so as to ensure that the voltage-equalizing ball of the high-voltage casing has sufficient electrical distance margin to the ground potential during power frequency and impact tests;

[0041] An external conductive integrated pipeline 5 is located outside the spliced ​​integral busbar box, and is used to connect the independent chamber 1 and the independent chamber 2; thereby realizing the integrated oil injection and discharge of the transformer body and the spliced ​​integral busbar box;

[0042] The support frame 11 is connected between the spliced ​​integral bus box and the transformer body, and is used to provide a support force of a set value for the spliced ​​integral bus box.

[0043] It should be noted that if Figure 8As shown, compared with the traditional transformer with vertical oil bushing 4, the present invention optimizes the insulating paper tube of the live body at the end of the protective bushing, the connecting lead inside the bus box, and the insulating component for clamping and fixing the connecting lead in the traditional structure. Due to the existence of the insulating paper tube of the live body at the end of the protective bushing, the connecting lead inside the bus box, and the insulating component for clamping and fixing the connecting lead, the left and right compartments of the traditional structure cannot be independent, and the oil cannot be filled and discharged as a whole with the transformer, which is inconvenient for transformer installation and maintenance. Moreover, the overall weight, height and height of the oil storage cabinet of the transformer of the present invention are greatly reduced. At the same time, due to the reduction in the height of the spliced ​​integral bus box, the support frame 11 is more stable, achieving material saving and energy reduction.

[0044] In an optional embodiment of the present invention, Figure 1 As shown, an operating hand hole 601 is provided on the proximal busbar box 1, and the operating hand hole 601 is located just above one end of the oil casing 4.

[0045] In an optional embodiment of the present invention, as shown in the figure, a second operating hand hole 602 and a third operating hand hole 603 are provided on the remote bus box 3, the second operating hand hole 602 is located directly above the other end of the oil casing 4, the third operating hand hole 603 is located directly above the valve 10, and both the second operating hand hole 602 and the first operating hand hole 601 are provided with air vent plugs 7.

[0046] It should be noted that the operation hand hole 1 601, the operation hand hole 2 602 and the operation hand hole 3 603 are provided for realizing internal wiring and for use when inspecting and repairing components in a local area, and the vent plug 7 is used for exhausting air when injecting transformer oil.

[0047] Example 2

[0048] On the basis of the above-mentioned embodiment 1, Figure 2-Figure 6 As shown, the remote busbar box 3 is provided with an oil drain area adjustment mechanism 9, and the oil drain area adjustment mechanism 9 is located between the other end of the oil casing 4 and the operating hand hole 3 603;

[0049] The oil discharge area regulating mechanism 9 comprises an expansion partition assembly 91 connected to the inner wall of the remote bus box 3, a one-way pump gas assembly 92 connected to the outer wall of the remote bus box 3, and a reset assembly 93 connected to the one-way pump gas assembly 92. The reset assembly 93 is connected to the expansion partition assembly 91 through the one-way pump gas assembly 92. The one-way pump gas assembly 92 is used to introduce gas into the expansion partition assembly 91 in one direction. The reset assembly 93 is used to discharge the gas in the expansion partition assembly 91.

[0050] When the one-way pump air component 92 unidirectionally introduces a set amount of gas into the expandable partition component 91, the expandable partition component 91 is used to separate the space in the remote bus box 3 into an upper chamber and a lower chamber, and the operating hand hole three 603 and the valve 10 are both connected to the lower chamber.

[0051] It should be noted that when maintenance is only required from the operating hand hole 1 601 and the operating hand hole 2 602, it is only necessary to control the amount of transformer oil discharged when the liquid level is lower than the set distance below the oil-oil casing 4. When maintenance is only required from the operating hand hole 3 603, at this time, a set amount of gas can be introduced into the expandable partition component 91 through the one-way pump gas component 92, so that the expandable partition component 91 can expand and deform. After the expansion and deformation, the expandable partition component 91 can achieve all-round blocking, thereby dividing the space in the remote bus box 3 into an upper chamber and a lower chamber. The other end of the oil-oil casing 4 is located in the upper chamber, and the operating hand hole 3 603 is located in the lower chamber. At this time, only the transformer oil in the lower chamber can be discharged, thereby realizing the oil discharge processing of the set area, reducing the amount of oil discharge, and effectively improving the maintenance efficiency. When the expandable partition component 91 does not separate the space in the remote bus box 3, the expandable partition component 91 does not affect the normal oil filling and draining.

[0052] In an optional embodiment of the present invention, Figure 3 As shown, the expandable partition assembly 91 includes an annular baffle plate 9101 fixedly connected to the inner wall of the remote bus box 3, an annular threading tube 9102 fixedly connected to the inner ring surface of the annular baffle plate 9101, an annular air bag 9103 connected to the inner ring surface of the annular threading tube 9102, and a channel 1 9104 connected to the annular air bag 9103. The channel 1 9104 passes through the annular threading tube 9102, the annular baffle plate 9101 and the remote bus box 3 in sequence, and the other end of the channel 1 9104 is connected to the one-way pump air assembly 92.

[0053] It should be noted that, as mentioned above, when the one-way pump air component 92 introduces gas into the expandable partition component 91, specifically, the gas flows through channel 1 9104 and then enters the annular airbag 9103. When the gas entering the annular airbag 9103 reaches a set amount, the annular airbag 9103 can be driven to expand to a set state, thereby filling the middle perforated area of ​​the annular threading tube 9102, and the expanded annular airbag 9103 can overcome the pressure exerted by the transformer oil in the upper chamber in the remote bus box 3. At this time, the entire upper chamber and the lower chamber are in a stable separation state.

[0054] In an optional embodiment of the present invention, Figure 4-Figure 5As shown, the one-way air pumping assembly 92 includes a telescopic air pumping assembly and a multi-directional air guide assembly connected to the outer wall of the remote bus box 3, and the telescopic air pumping assembly and the reset assembly 93 are both connected to the expandable partition assembly 91 through the multi-directional air guide assembly.

[0055] The telescopic pump air assembly includes a fixed plate 9201 fixedly connected to the outer wall of the remote bus box 3, an elastic telescopic rod 9204 connected to the fixed plate 9201, a movable plate 9202 connected to the other end of the elastic telescopic rod 9204, a bellows 9203 connected between the fixed plate 9201 and the movable plate 9202, a slot 9205 provided on the fixed plate 9201, an air guide plate 9206 connected to the open end of the slot 9205, a plurality of air holes 9207 provided on the air guide plate 9206, and a plurality of air holes 9207 connected to the air holes 9207 located inside the slot 9205. The plastic sealing sheet 1 9208 on the end surface, the slot 2 9209 and the plurality of air holes 2 9210 provided on the movable plate 9202, and the plastic sealing sheet 2 9211 connected to the inner wall of the slot 2 9209, a sealed pump air chamber is formed between the fixed plate 9201, the movable plate 9202 and the bellows 9203, the plastic sealing sheet 1 9208 covers the plurality of air holes 1 9207, and only one end thereof is fixedly connected to the air guide plate 9206, and the plastic sealing sheet 2 9211 covers the plurality of air holes 2 9210, and only one end thereof is fixedly connected to the inner wall of the slot 2 9209;

[0056] When the internal space of the moving plate 9202 is gradually reduced, a positive pressure is generated inside the sealed pump air chamber, and the air hole 1 9207 and the air hole 2 9210 are in an open state and a closed state respectively;

[0057] When the internal space of the movable plate 9202 is gradually restored, positive pressure is generated inside the sealed pump air chamber, and the air hole 1 9207 and the air hole 2 9210 are in a closed state and an open state respectively.

[0058] The multi-directional air guide assembly includes an air guide tube 9212 fixedly connected to the slot 1 9205 and a three-way joint 9213 connected to the outer wall of the remote bus box 3. One end of the air guide tube 9212 is connected to the slot 1 9205, and the other end thereof is connected to the channel 1 9104 through the three-way joint 9213.

[0059] It should be noted that, as mentioned above, when the gas is pumped into the expandable partition assembly 91 through the one-way pump air assembly 92, the movable plate 9202 is pressed by humans, and the movable plate 9202 moves toward the fixed plate 9201 after being pressed, and squeezes the elastic telescopic rod 9204 and the bellows 9203, and the sealed pump air chamber formed between the fixed plate 9201, the movable plate 9202 and the bellows 9203 is compressed, and its internal space becomes smaller, generating positive pressure, and the positive pressure applies pressure to the plastic sealing sheet 1 9208 and the plastic sealing sheet 2 9211 respectively. Because the plastic sealing sheet 2 9211 is arranged in the groove 2 9209, under the action of pressure, it can tightly cover the plurality of air holes 2 9210, thereby isolating the internal space of the sealed pump air chamber from the external space, and the plastic sealing sheet 1 9208 is bent and deformed toward the inside of the groove 1 9205 under the action of the pressure, so that the gas in the sealed pump air chamber is transported to the air guide pipe 9212 by pressure, flows through the air guide pipe 9212 and the three-way joint 9213 in turn, enters the channel 1 9104, and finally enters the annular airbag 9103. When the elastic telescopic rod 9204 is compressed to the limit, the movable plate 9202 is pulled in the opposite direction, so that the movable plate 9202 is away from the fixed plate 9201. At this time, the sealed pump air chamber begins to recover from the minimum state to the maximum state. In this process, negative pressure is generated inside the sealed pump air chamber. The negative pressure acts on the plastic sealing sheet 1 9208 and the plastic sealing sheet 2 9211, respectively, so that the plastic sealing sheet 1 9208 is closely attached to the air guide plate 9206 and blocks a plurality of air holes 1 9207. At this time, the slot 1 9205, the air guide pipe 9212, The gases in the three-way joint 9213, channel one 9104 and the annular airbag 9103 cannot flow back to the sealed pump air chamber, while the plastic sealing piece two 9211 bends toward the inside of the sealed pump air chamber under the action of negative pressure, so that the external gas is pumped into the sealed pump air chamber. The reciprocating cycle can continuously pump the external gas into the annular airbag 9103 until the air pressure in the annular airbag 9103 reaches the set value. In the normal state, when the movable plate 9202 can no longer be pressed manually, the air pressure in the annular airbag 9103 reaches the set value.

[0060] In an optional embodiment of the present invention, Figure 5-Figure 6 As shown, the reset assembly 93 includes an exhaust pipe 9301 connected to the three-way joint 9213, a stepped channel 9302 arranged inside the exhaust pipe 9301, a spring 9303 and a stepped piston 9304 arranged in the stepped channel 9302, a pressure rod 9305 connected to the stepped piston 9304, and a handle 9306 connected to the pressure rod 9305. When the spring 9303 is shortened to a set length, the stepped channel 9302 is connected to channel one 9104 through the three-way joint 9213.

[0061] It should be noted that, when the inspection is completed and oil is refilled into the lower chamber, when the oil refill reaches the set amount, the annular airbag 9103 can be controlled to return to its initial state. At this time, it is only necessary to press the handle 9306 to move the pressure rod 9305 toward the direction of the three-way joint 9213. When the pressure rod 9305 moves, it pushes the stepped piston 9304 to move in the same direction and distance. When the stepped piston 9304 moves, it begins to squeeze the spring 9303. When the spring 9303 is squeezed to the shortest state, the stepped channel 9302 and the three-way joint 9213 are connected and are no longer separated by the stepped piston 9304, so that the gas inside the annular airbag 9103 flows through channel 1 9104, the three-way joint 9213 and the stepped channel 9302 in turn, and is finally discharged to the outside, thereby realizing the resetting of the annular airbag 9103 and the reintegration of the upper chamber and the lower chamber into a whole.

[0062] The present embodiment is described above, but the present embodiment is not limited to the above-mentioned specific implementation manner. The above-mentioned specific implementation manner is merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, which are all within the protection of the present embodiment.

Claims

1. A horizontally placed structure for oil bushings of large power transformers, characterized in that: include: A spliced ​​integral bus box, the spliced ​​integral bus box comprising a proximal bus box (1) connected to a transformer body, a CT end bus box (2) connected to the other end of the proximal bus box (1), a flange (201) connected to the other end of the CT end bus box (2), and a distal bus box (3) connected to the flange (201); an independent chamber 1 is formed between the proximal bus box (1), the CT end bus box (2), the flange (201) and the transformer body; an independent chamber 2 is formed between the flange (201) and the distal bus box (3); a valve (10) is provided at a position close to the other end of the distal bus box (3); The oil-oil casing (4) is horizontally connected to the middle of the flange (201), one end of which is located in the independent chamber 1, and the other end of which is located in the independent chamber 2, and both ends of the oil-oil casing (4) are provided with a pressure-equalizing ball-covered insulating layer (8); An external conductive integrated pipeline (5), the external conductive integrated pipeline (5) is located outside the spliced ​​integral busbar box, and the external conductive integrated pipeline (5) is used to connect the independent chamber 1 and the independent chamber 2; A support frame (11), wherein the support frame (11) is connected between the spliced ​​integral bus box and the transformer body, and is used to provide a support force of a set value for the spliced ​​integral bus box.

2. The horizontally placed structure for oil bushings of large power transformers according to claim 1 is characterized in that: The proximal busbar box (1) is provided with an operating hand hole (601), and the operating hand hole (601) is located directly above one end of the oil casing (4).

3. The horizontally placed structure for oil bushings of large power transformers according to claim 2 is characterized in that: The remote busbar box (3) is provided with a second operating hand hole (602) and a third operating hand hole (603), wherein the second operating hand hole (602) is located directly above the other end of the oil casing (4), and the third operating hand hole (603) is located directly above the valve (10), and both the second operating hand hole (602) and the first operating hand hole (601) are provided with air release plugs (7).

4. The horizontally placed structure for oil bushings of large power transformers according to claim 3 is characterized in that: The remote busbar box (3) is provided with an oil drain area adjustment mechanism (9), and the oil drain area adjustment mechanism (9) is located between the other end of the oil casing (4) and the operating hand hole three (603); The oil discharge area regulating mechanism (9) comprises an expandable partition assembly (91) connected to the inner wall of the remote busbar box (3), a one-way pumping assembly (92) connected to the outer wall of the remote busbar box (3), and a reset assembly (93) connected to the one-way pumping assembly (92); the reset assembly (93) is connected to the expandable partition assembly (91) via the one-way pumping assembly (92); the one-way pumping assembly (92) is used to introduce gas into the expandable partition assembly (91) in one direction; and the reset assembly (93) is used to discharge the gas in the expandable partition assembly (91); When the one-way pump air component (92) unidirectionally introduces a set amount of gas into the expandable partition component (91), the expandable partition component (91) is used to separate the space in the remote bus box (3) into an upper chamber and a lower chamber, and the operating hand hole three (603) and the valve (10) are both connected to the lower chamber.

5. The horizontally placed structure for oil bushings of large power transformers according to claim 4 is characterized in that: The expandable partition assembly (91) comprises an annular baffle plate (9101) fixedly connected to the inner wall of the remote bus box (3), an annular threading tube (9102) fixedly connected to the inner ring surface of the annular baffle plate (9101), an annular air bag (9103) connected to the inner ring surface of the annular threading tube (9102), and a channel one (9104) connected to the annular air bag (9103), wherein the channel one (9104) passes through the annular threading tube (9102), the annular baffle plate (9101) and the remote bus box (3) in sequence, and the other end of the channel one (9104) is connected to the one-way pump air assembly (92).

6. The horizontally placed structure for oil bushings of large power transformers according to claim 5 is characterized in that: The one-way air pumping assembly (92) comprises a telescopic air pumping assembly and a multi-directional air guide assembly connected to the outer wall of the remote busbar box (3); the telescopic air pumping assembly and the reset assembly (93) are both connected to the expandable partition assembly (91) via the multi-directional air guide assembly.

7. The horizontally placed structure for oil bushings of large power transformers according to claim 6 is characterized in that: The telescopic pump air assembly comprises a fixed plate (9201) fixedly connected to the outer wall of the remote busbar box (3), an elastic telescopic rod (9204) connected to the fixed plate (9201), a movable plate (9202) connected to the other end of the elastic telescopic rod (9204), a bellows (9203) connected between the fixed plate (9201) and the movable plate (9202), a slot one (9205) provided on the fixed plate (9201), an air guide plate (9206) connected to the open end of the slot one (9205), a plurality of air holes one (9207) provided on the air guide plate (9206), and a gas outlet (9207) connected to the air holes one (9207) and located inside the slot one (9205). A plastic sealing sheet (9208) on the end surface, a groove (9209) and a plurality of air holes (9210) provided on the movable plate (9202), and a plastic sealing sheet (9211) connected to the inner wall of the groove (9209), a sealed pump air chamber is formed between the fixed plate (9201), the movable plate (9202) and the bellows (9203), the plastic sealing sheet (9208) covers a plurality of air holes (9207), and only one end thereof is fixedly connected to the air guide plate (9206), and the plastic sealing sheet (9211) covers a plurality of air holes (9210), and only one end thereof is fixedly connected to the inner wall of the groove (9209); When the internal space of the moving plate (9202) is gradually reduced, a positive pressure is generated inside the sealed pump air chamber, and the air hole 1 (9207) and the air hole 2 (9210) are in an open state and a closed state respectively; When the internal space of the movable plate (9202) gradually recovers, positive pressure is generated inside the sealed pump air chamber, and the air hole 1 (9207) and the air hole 2 (9210) are in a closed state and an open state respectively.

8. The horizontally placed structure for oil bushings of large power transformers according to claim 7 is characterized in that: The multi-directional air guide assembly comprises an air guide tube (9212) fixedly connected to slot one (9205) and a three-way joint (9213) connected to the outer wall of the remote bus box (3); one end of the air guide tube (9212) is connected to slot one (9205), and the other end thereof is connected to channel one (9104) via the three-way joint (9213).

9. The horizontally placed structure for oil bushings of large power transformers according to claim 8 is characterized in that: The reset assembly (93) includes an exhaust pipe (9301) connected to a three-way joint (9213), a stepped channel (9302) provided inside the exhaust pipe (9301), a spring (9303) and a stepped piston (9304) provided inside the stepped channel (9302), a pressure rod (9305) connected to the stepped piston (9304), and a handle (9306) connected to the pressure rod (9305). When the spring (9303) is shortened to a set length, the stepped channel (9302) is connected to channel 1 (9104) via the three-way joint (9213).

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