CN117116618A - Oil immersed transformer and explosion-proof structure thereof - Google Patents
Oil immersed transformer and explosion-proof structure thereof Download PDFInfo
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- CN117116618A CN117116618A CN202311267011.1A CN202311267011A CN117116618A CN 117116618 A CN117116618 A CN 117116618A CN 202311267011 A CN202311267011 A CN 202311267011A CN 117116618 A CN117116618 A CN 117116618A
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- explosion
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- 239000007789 gas Substances 0.000 claims abstract description 61
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000012528 membrane Substances 0.000 claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 239000013589 supplement Substances 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 15
- 230000003014 reinforcing effect Effects 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 3
- 238000004880 explosion Methods 0.000 abstract description 12
- 239000002360 explosive Substances 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 description 11
- 241000282326 Felis catus Species 0.000 description 10
- 230000004044 response Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention discloses an explosion-proof structure of an oil-immersed transformer and the oil-immersed transformer, which comprise an oil tank, an air tank and an air charging device, wherein the oil tank comprises a plurality of tank walls, one of the tank walls is an elastic tank wall, the other tank walls are fixed tank walls, and flanges communicated with the inside of the oil tank are arranged on the elastic tank walls; the air box is connected to the elastic box wall and is covered outside the flange, the air box is communicated with the oil box through the flange, and the flange is provided with an explosion-proof film so that a closed cavity is formed in the air box; the air charging device is positioned in the closed cavity, and the air charging device can supplement nitrogen into the closed cavity so as to enable the closed cavity to be in a positive pressure state. The elastic tank wall provided by the invention can deform to absorb a large amount of pressure wave energy, so that the impact force of pressure waves on the oil tank is reduced, and the explosion-proof performance of the transformer is effectively improved. After the explosion-proof membrane breaks, nitrogen in the gas tank can quickly fill the oil tank to separate oil, explosive and air, so that further expansion of explosion is avoided, and the safety of the transformer is improved.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to an oil immersed transformer and an explosion-proof structure thereof.
Background
The oil immersed transformer is widely used in a power grid as a high-performance transformer with reasonable structure and excellent performance. When an arcing fault occurs in the oil immersed transformer, the oil immersed paper insulation in the transformer is instantaneously decomposed and exploded, and is transmitted to the inner wall of the oil tank in the form of pressure waves, so that impact is caused to the inner wall of the oil tank. When the impact pressure of the pressure wave on the oil tank exceeds the allowable pressure of the oil tank, a pressure release valve mounted on the transformer starts to operate and release the pressure, and the response speed of the pressure release valve is about 2ms. For the pressure wave with larger impact energy, the propagation speed of the pressure wave in the liquid can reach 1500m/s, the pressure wave can propagate for a distance of about 3m before the pressure release valve responds, the response time of the pressure release valve is enough to transmit the pressure wave to the inner wall of the oil tank, and in the case, the pressure release valve cannot prevent the impact damage of the impact wave to the oil tank, the tank wall of the oil tank is easy to crack, and the potential safety hazard is high.
Disclosure of Invention
The invention mainly aims to provide an oil-immersed transformer and an explosion-proof structure thereof, and aims to solve the technical problems that a pressure relief valve cannot protect an oil tank from being damaged and potential safety hazards are high when the oil-immersed transformer breaks down to generate shock waves with larger pressure in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides an explosion-proof structure of an oil immersed transformer, which comprises an oil tank, an air tank and an air charging device, wherein the oil tank comprises a plurality of tank walls, one of the tank walls is an elastic tank wall, the other tank walls are fixed tank walls, and flanges communicated with the inside of the oil tank are arranged on the elastic tank walls; the air box is connected to the elastic box wall, the air box is covered outside the flange, the air box is communicated with the oil box through the flange, and an explosion-proof membrane is arranged on the flange so that a closed cavity is formed in the air box; the air charging device is positioned in the closed cavity, and can supplement nitrogen into the closed cavity so as to enable the closed cavity to be in a positive pressure state.
Optionally, the air charging device comprises a gas storage bottle and an air pressure sensor, wherein nitrogen is stored in the gas storage bottle, the gas storage bottle is installed on one side, far away from the elastic box wall, of the closed cavity, and the air pressure sensor is used for detecting air pressure of the closed cavity.
Optionally, the flange is disposed on an upper portion of the elastic wall, and the gas cylinder is mounted on a lower portion of a side of the closed cavity away from the elastic wall.
Optionally, the gas tank is one side open setting, the gas tank includes gas tank roof, gas tank diapire and connects the gas tank roof reaches three gas tank lateral wall between the gas tank diapire, the gas tank open side with the elasticity case wall is connected, in order to pass through elasticity case wall gas tank roof gas tank diapire and three gas tank lateral wall enclose jointly airtight cavity.
Optionally, the top wall of the air tank is provided with an exhaust valve, and the bottom wall of the air tank is provided with an oil discharge valve; and/or, an access opening is formed in one side wall of the air box, and a sealing cover is arranged on the access opening cover; and/or, be provided with the maintenance cat ladder in the airtight cavity, the bottom support of maintenance cat ladder in the gas tank diapire, the top of maintenance cat ladder upwards extends to flange department.
Optionally, the oil tank is rectangular, the six tank walls of the oil tank are respectively the elastic tank wall, the oil tank top wall, the oil tank bottom wall and three oil tank side walls connected between the oil tank top wall and the oil tank bottom wall, the oil tank top wall, the oil tank bottom wall and the three oil tank side walls are respectively the fixed tank walls, and the top edge, the bottom edge and the two side edges of the elastic tank wall are respectively welded to the oil tank top wall, the oil tank bottom wall and the two oil tank side walls correspondingly; the three edges of the top wall of the oil tank, which are adjacent to the three side walls of the oil tank, are downwards folded to form three lower folded edges, the three edges of the bottom wall of the oil tank, which are adjacent to the three side walls of the oil tank, are upwards folded to form three upper folded edges, and the lower folded edges and the upper folded edges are welded on the side walls of the oil tank on the corresponding sides.
Optionally, a diagonal brace is connected between any two adjacent fixed tank walls, and the diagonal brace is positioned in the oil tank; a plurality of reinforcing pieces are arranged on the outer side of each oil tank side wall, and the air tank is connected with two adjacent oil tank side walls through the plurality of reinforcing pieces.
Optionally, the explosion-proof structure further comprises a detection device and an alarm device, wherein the detection device is arranged in the closed cavity, the detection device is used for detecting the integrity of the explosion-proof membrane, the alarm device is arranged outside the oil tank or the air tank, and the detection device is electrically connected with the alarm device.
Optionally, the quantity of gas tank is a plurality of, and a plurality of gas tank is followed the horizontal direction interval distribution, the flange with gas tank quantity is unanimous and the setting of one-to-one.
In a second aspect, the invention provides an oil-immersed transformer, which comprises the explosion-proof structure of the oil-immersed transformer.
According to the explosion-proof structure of the oil immersed transformer, one of the tank walls of the oil tank is set to be the elastic tank wall with the structural strength lower than that of the other tank walls, and when the oil tank fails to generate pressure waves, the elastic tank wall can deform greatly to absorb a large amount of pressure wave energy, so that the impact force of the pressure waves on the fixed tank wall is reduced. Meanwhile, the explosion-proof membrane breaks under the impact of pressure waves, the oil tank is communicated with the gas tank, so that part of oil in the oil tank can flow into the gas tank through the flange, the impact pressure in the oil tank is reduced rapidly, the fixed tank wall is protected, the oil tank is prevented from being damaged, and the explosion-proof performance of the transformer is improved effectively. After the explosion-proof membrane breaks, nitrogen in the gas tank can quickly fill the upper space in the oil tank, so that oil, explosives and air are separated, explosion is prevented from further expanding, and the safety of the transformer is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic side view of an explosion-proof structure of an oil-immersed transformer according to an embodiment of the present invention;
fig. 2 is a schematic top view of an explosion-proof structure of an oil-immersed transformer according to an embodiment of the invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 10 | Oil tank | 21 | Oil drain valve |
| 11 | Fixed box wall | 22 | Exhaust valve |
| 12 | Elastic box wall | 23 | Access hole |
| 13 | Flange | 24 | Maintenance cat ladder |
| 14 | Explosion-proof membrane | 25 | Viewing window |
| 15 | Reinforcing member | 30 | Air charging device |
| 16 | Diagonal bracing | 31 | Gas storage bottle |
| 20 | Air box |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides an explosion-proof structure of an oil immersed transformer, which comprises an oil tank 10, an air tank 20 and an air charging device 30, wherein the oil tank 10 comprises a plurality of tank walls, one of the tank walls is an elastic tank wall 12, the other tank walls are fixed tank walls 11, and the elastic tank wall 12 is provided with a flange 13 communicated with the inside of the oil tank 10; the gas tank 20 is connected to the elastic tank wall 12, the gas tank 20 is covered outside the flange 13, the gas tank 20 is communicated with the oil tank 10 through the flange 13, and the explosion-proof membrane 14 is arranged on the flange 13 so as to form a closed cavity in the gas tank 20; the inflator 30 is located in the closed chamber, and the inflator 30 can supplement nitrogen into the closed chamber to make the closed chamber in a positive pressure state.
Under the normal use state of the transformer, the oil tank 10 of the oil immersed transformer is filled with oil, the gas tank 20 is filled with nitrogen, the explosion-proof membrane 14 separates the oil in the oil tank 10 from the nitrogen in the gas tank 20, and the air charging device 30 can supplement the nitrogen into the gas tank 20 at any time according to the air pressure in the gas tank 20, so that the closed cavity is always in a positive pressure state. The explosion-proof membrane 14 is an explosion-proof membrane 14 in the prior art, when pressure waves are generated due to explosion in the oil tank 10, the elastic tank wall 12 is greatly deformed under the impact pressure of the pressure waves because the structural strength of the elastic tank wall 12 is lower than that of the fixed tank wall 11, so that the elastic tank wall 12 can absorb the impact pressure of a large amount of pressure waves, the explosion-proof membrane 14 is broken under the impact action of the pressure waves, part of oil in the oil tank 10 flows into the air tank 20 through the flange 13, the pressure in the oil tank 10 can be rapidly reduced, and the situation that the pressure waves generate cracks on the fixed tank wall 11 due to overlarge impact pressure of the pressure waves on the fixed tank wall 11 is avoided, so that the fixed tank wall 11 is effectively protected. In addition, when the rupture disk 14 breaks, part of the oil in the oil tank 10 flows into the gas tank 20, and the nitrogen in the gas tank 20 can quickly fill the upper space in the oil tank 10 to isolate the oil and explosives in the oil tank 10 from the air, thereby reducing the explosion risk and reducing the potential safety hazard.
According to the explosion-proof structure of the oil immersed transformer, one tank wall of the oil tank 10 is set to be the elastic tank wall 12 with the structural strength lower than that of the other tank walls, and when the oil tank 10 fails to generate pressure waves, the elastic tank wall 12 can absorb the energy of the pressure waves through elastic deformation, so that the impact force of the pressure waves on the fixed tank wall 11 is reduced. Meanwhile, the explosion-proof membrane 14 breaks under the impact of pressure waves, so that part of oil in the oil tank 10 can flow into the gas tank 20 through the flange 13, thereby rapidly reducing the impact pressure in the oil tank 10, protecting the fixed tank wall 11, avoiding the oil tank 10 from being damaged and effectively improving the explosion-proof performance of the transformer. After rupture of the rupture disc 14, the nitrogen in the gas tank 20 can isolate the oil and explosives from the air, thereby avoiding further expansion of the explosion, reducing potential safety hazards and improving the safety of the transformer.
In one embodiment, the inflator 30 includes a gas cylinder 31 and a pressure sensor, wherein nitrogen is stored in the gas cylinder 31, the gas cylinder 31 is installed on a side of the closed cavity away from the elastic wall 12, and the pressure sensor is used for detecting the pressure of the closed cavity.
It may be noted that the opening of the gas bomb 31 is provided with a valve, the valve and the gas pressure sensor are both electrically connected to the external controller, the gas pressure sensor sends the detected gas pressure value to the external controller, and the controller controls the opening and closing of the valve according to the detection result, so as to adjust the gas pressure of the closed cavity to a preset value, thereby realizing real-time adjustment of the gas pressure of the closed cavity. The preset air pressure value of the closed cavity is higher than the atmospheric pressure and lower than the pressure bearing limit value of the explosion-proof membrane 14, so that the nitrogen in the air tank 20 cannot break the explosion-proof membrane 14 in the normal state of the transformer, and when the explosion-proof membrane 14 breaks, the nitrogen in the air tank 20 can rapidly fill the oil tank 10.
The sealed cavity in the gas tank 20 keeps a positive pressure state, so that the nitrogen can respond more rapidly, and the oil tank 10 is filled with the nitrogen more completely, so that the effect of isolating the air by the nitrogen is better, further expansion of explosion in the oil tank 10 is avoided, and the safety of the transformer is effectively ensured.
In one embodiment, the flange 13 is disposed on the upper portion of the flexible wall 12, and the gas cylinder 31 is mounted on the lower portion of the side of the closed chamber remote from the flexible wall 12.
It should be noted that, the high-voltage bushing in the transformer is usually connected to the top of the oil tank 10, the connection between the high-voltage bushing and the oil tank 10 is weak, the pressure wave generated by explosion in the transformer may break the high-voltage bushing itself or the connection between the high-voltage bushing and the oil tank 10, the flange 13 is disposed on the upper side of the elastic wall 12, so that the distance between the flange 13 and the high-voltage bushing is shorter, the nitrogen in the air tank 20 can fill the upper portion of the oil tank 10 more rapidly, and the response speed of the nitrogen is effectively improved. Meanwhile, pressure waves generated by explosion impact the elastic tank wall 12 and the explosion-proof membrane 14, and the gas storage bottle 31 is arranged at the lower part of one side far away from the elastic tank wall 12, so that the gas storage bottle 31 is far away from the elastic tank wall 12 and the explosion-proof membrane 14 as far as possible, the pressure waves are prevented from impacting the gas storage bottle 31, and the gas storage bottle 31 is effectively protected.
In an embodiment, the air box 20 is provided with an open side, and the air box 20 includes an air box 20 top wall, an air box 20 bottom wall, and three air box 20 side walls connected between the air box 20 top wall and the air box 20 bottom wall, where the open side of the air box 20 is connected with the elastic box wall 12, so as to jointly enclose a closed cavity through the elastic box wall 12, the air box 20 top wall, the air box 20 bottom wall, and the three air box 20 side walls.
It can be explained that the three air box 20 side walls are integrally formed by bending plates, the upper and lower sides of the air box 20 side walls are respectively welded to the top wall of the air box 20 and the bottom wall of the air box 20, and the top wall of the air box 20, the bottom wall of the air box 20 and one side of the air box 20 side wall close to the opening are welded or flanged 13 is connected to the elastic box wall 12, so that the air box 20 has good air tightness. The air tank 20 and the oil tank 10 share the elastic tank wall 12, so that when the elastic side wall is impacted by pressure waves, the elastic side wall can deform towards the inside of the air tank 20, thereby ensuring that the elastic side wall has good elastic performance and saving materials.
In one embodiment, the top wall of the air box 20 is provided with an exhaust valve 22, and the bottom wall of the air box 20 is provided with an oil discharge valve 21; and/or, the side wall of one air box 20 is provided with an access hole 23, and the access hole 23 is covered with a sealing cover; and/or, be provided with the maintenance cat ladder 24 in the airtight cavity, the bottom support of maintenance cat ladder 24 is in the air tank 20 diapire, and the top of maintenance cat ladder 24 upwards extends to flange 13 department.
When the pressure wave is generated by explosion in the oil tank 10, the pressure in the oil tank 10 and the air tank 20 increases, and the exhaust valve 22 is automatically opened to quickly reduce the pressure in the oil tank 10 and the air tank 20, thereby protecting the transformer. The oil drain valve 21 is installed at the lowest point of the gas tank 20, after the explosion-proof membrane 14 breaks, part of the oil in the oil tank 10 flows into the gas tank 20, and at this time, the oil can be drained through the oil drain valve 21, so that the pressure in the oil tank 10 and the gas tank 20 is kept stable, and the subsequent use of the gas tank 20 is facilitated. The access opening 23 and the gas cylinder 31 are arranged on the side walls of different gas tanks 20, so that the interference between the access opening 23 and the gas cylinder 31 is avoided. The maintenance cat ladder 24 is welded on the elastic box wall 12, and the maintenance cat ladder 24 is arranged opposite to the flange 13, so that the maintenance and replacement of the explosion-proof membrane 14 are facilitated through the maintenance cat ladder 24. The bottom of the side wall of one of the air tanks 20 is also provided with an observation window 25, and the oil level at the bottom of the air tank 20 can be observed at any time through the observation window 25, so that whether the explosion-proof membrane 14 is broken or not can be rapidly judged.
In one embodiment, the oil tank 10 is in a cuboid shape, six tank walls of the oil tank 10 are respectively an elastic tank wall 12, an oil tank 10 top wall, an oil tank 10 bottom wall and three oil tank 10 side walls connected between the oil tank 10 top wall and the oil tank 10 bottom wall, the oil tank 10 top wall, the oil tank 10 bottom wall and the three oil tank 10 side walls are respectively a fixed tank wall 11, and top edges, bottom edges and two side edges of the elastic tank wall 12 are respectively welded to the oil tank 10 top wall, the oil tank 10 bottom wall and the two oil tank 10 side walls; the three edges of the top wall of the oil tank 10 adjacent to the three side walls of the oil tank 10 are all folded downwards to form three lower folds, the three edges of the bottom wall of the oil tank 10 adjacent to the three side walls of the oil tank 10 are all folded upwards to form three upper folds, and each lower fold and each upper fold are welded on the side wall of the oil tank 10 on the corresponding side.
It should be noted that, the top wall of the oil tank 10 is formed with three lower folds corresponding to three side walls of the oil tank 10, the bottom wall of the oil tank 10 is formed with three upper folds corresponding to three side walls of the oil tank 10, the welding position of the top wall of the oil tank 10 and the side walls of the oil tank 10 avoids the edge of the upper part of the oil tank 10, and the upper folds enable the welding position of the bottom of the oil tank 10 and the side walls of the oil tank 10 to avoid the edge of the lower part of the oil tank 10. Because the edges and the corner points of the oil tank 10 are stress concentration positions, welding seams with weak structural strength are arranged to avoid all edges and all corner points of the oil tank 10, the edges and the corner points of the oil tank 10 are ensured to have enough structural strength, the oil tank 10 is prevented from being damaged due to stress concentration of the edges and the corner points when being impacted by pressure waves, the structural strength of the oil tank 10 is effectively enhanced, and therefore the explosion-proof performance of a transformer is improved. Simultaneously, the oil tank 10 diapire passes through a plurality of high-strength bolted connection on the base, can further promote the structural strength of oil tank 10 to promote the explosion-proof performance of oil tank 10.
In one embodiment, diagonal braces 16 are connected between any two adjacent fixed tank walls 11, and each diagonal brace 16 is positioned in the oil tank 10; a plurality of reinforcing members 15 are provided on the outer side of the side wall of each tank 10, and the gas tank 20 and the side walls of the two tanks 10 adjacent thereto are connected by the plurality of reinforcing members 15.
Further, the diagonal braces 16 are connected between two adjacent fixed tank walls 11, so that each corner of the oil tank 10 can be reinforced, and the structural strength of the corner of the oil tank 10 is effectively improved. The plurality of reinforcing members 15 are arranged at the edge of the outer side of the side wall of the oil tank 10 along the vertical interval, the shape of each reinforcing member 15 is determined according to the specific shape of the side wall of the oil tank 10, each reinforcing member 15 is attached to the outer side of the side wall of the oil tank 10, the plurality of reinforcing members 15 are used for reinforcing the edge of the oil tank 10 together, and the structural strength of the side wall and the edge of the oil tank 10 is further improved. The reinforcing members 15 on the side walls of the two oil tanks 10 adjacent to the air tank 20 extend to the air tank 20 and are connected to the side walls of the air tank 20, so that the connection stability of the air tank 20 and the oil tank 10 is further improved, the side walls of the oil tank 10 and the side walls of the air tank 20 are reinforced, and the explosion-proof performance of the transformer is effectively improved.
In an embodiment, the explosion-proof structure further includes a detecting device and an alarm device, the detecting device is disposed in the closed cavity, the detecting device is used for detecting the integrity of the explosion-proof film 14, the alarm device is disposed outside the oil tank 10 or outside the air tank 20, and the detecting device is electrically connected to the alarm device.
It will be appreciated that when the detection means detects rupture of the rupture disc 14, the detection means sends information to the alarm means to trigger an alarm, facilitating a quick response after a failure of the transformer. The invention is not limited to the type of detection device and alarm device, but it can be stated that the detection device can be an optical detection device or a resistance detection device in the prior art, and the alarm device can be a buzzer or an audible and visual alarm in the prior art.
In an embodiment, the number of the air tanks 20 is plural, the plurality of air tanks 20 are distributed at intervals along the horizontal direction, and the flanges 13 are consistent in number and are arranged in one-to-one correspondence with the air tanks 20.
It should be noted that the flanges 13 are also arranged at intervals in the horizontal direction so that the heights of the flanges 13 are the same, and the explosion-proof films 14 having the same performance are mounted on each flange 13. When explosion occurs in the oil tank 10, the plurality of air tanks 20 can simultaneously charge nitrogen into the oil tank 10 from the plurality of flanges 13, and the plurality of exhaust valves 22 on the plurality of air tanks 20 can simultaneously release pressure generated by the explosion, so that the response speed in the case of failure is effectively improved, the possibility of further expansion of the explosion is reduced, and the safety of the transformer is improved.
The invention further provides an oil-immersed transformer, which comprises the explosion-proof structure of the oil-immersed transformer. The specific structure of the oil-immersed transformer refers to the above embodiments, and because the oil-immersed transformer adopts all the technical solutions of all the embodiments, the oil-immersed transformer has at least all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structural modifications made by the present description and accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. An explosion-proof structure of an oil immersed transformer, comprising:
the oil tank comprises a plurality of tank walls, wherein one tank wall is an elastic tank wall, the other tank walls are fixed tank walls, and flanges communicated with the inside of the oil tank are arranged on the elastic tank wall;
the air box is connected to the elastic box wall, the air box is covered outside the flange, the air box is communicated with the oil box through the flange, and an explosion-proof membrane is arranged on the flange so that a closed cavity is formed in the air box;
the air charging device is positioned in the closed cavity, and can supplement nitrogen into the closed cavity so as to enable the closed cavity to be in a positive pressure state.
2. The explosion-proof structure of an oil immersed transformer according to claim 1, wherein the air charging device comprises an air cylinder and an air pressure sensor, nitrogen is stored in the air cylinder, the air cylinder is arranged on one side of the closed cavity far away from the elastic box wall, and the air pressure sensor is used for detecting air pressure of the closed cavity.
3. The explosion-proof structure of an oil immersed transformer according to claim 2, wherein the flange is provided at an upper portion of the elastic tank wall, and the gas cylinder is mounted at a lower portion of a side of the closed cavity away from the elastic tank wall.
4. The explosion-proof structure of an oil immersed transformer according to claim 1, wherein the air tank is provided with an opening at one side, the air tank comprises an air tank top wall, an air tank bottom wall and three air tank side walls connected between the air tank top wall and the air tank bottom wall, and the opening side of the air tank is connected with the elastic tank wall so as to jointly enclose the closed cavity through the elastic tank wall, the air tank top wall, the air tank bottom wall and the three air tank side walls.
5. The explosion-proof structure of an oil immersed transformer according to claim 4, wherein,
the top wall of the air box is provided with an exhaust valve, and the bottom wall of the air box is provided with an oil discharge valve; and/or the number of the groups of groups,
one of the side walls of the air box is provided with an access opening, and the access opening is provided with a sealing cover; and/or the number of the groups of groups,
the inner portion of the closed cavity is provided with an overhaul ladder, the bottom of the overhaul ladder is supported by the bottom wall of the air box, and the top of the overhaul ladder extends upwards to the flange.
6. The explosion-proof structure of an oil immersed transformer according to any one of claims 1 to 5, wherein the oil tank is rectangular parallelepiped, six of the tank walls are respectively the elastic tank wall, the oil tank top wall, the oil tank bottom wall and three tank side walls connected between the oil tank top wall and the oil tank bottom wall, the oil tank top wall, the oil tank bottom wall and the three tank side walls are respectively the fixed tank walls, and top edges, bottom edges and two side edges of the elastic tank wall are respectively welded to the oil tank top wall, the oil tank bottom wall and two of the oil tank side walls; the three edges of the top wall of the oil tank, which are adjacent to the three side walls of the oil tank, are downwards folded to form three lower folded edges, the three edges of the bottom wall of the oil tank, which are adjacent to the three side walls of the oil tank, are upwards folded to form three upper folded edges, and the lower folded edges and the upper folded edges are welded on the side walls of the oil tank on the corresponding sides.
7. The explosion-proof structure of an oil immersed transformer according to claim 6, wherein diagonal braces are connected between any two adjacent fixed tank walls, and each diagonal brace is positioned in the oil tank; a plurality of reinforcing pieces are arranged on the outer side of each oil tank side wall, and the air tank is connected with two adjacent oil tank side walls through the plurality of reinforcing pieces.
8. The explosion-proof structure of an oil immersed transformer according to any one of claims 1 to 5, further comprising a detection device and an alarm device, wherein the detection device is disposed in the closed cavity, the detection device is used for detecting the integrity of the explosion-proof membrane, the alarm device is disposed outside the oil tank or outside the gas tank, and the detection device is electrically connected to the alarm device.
9. The explosion-proof structure of an oil immersed transformer according to any one of claims 1 to 5, wherein the number of the air tanks is plural, the air tanks are distributed at intervals in a horizontal direction, and the flanges are arranged in a one-to-one correspondence with the number of the air tanks.
10. An oil immersed transformer, characterized by comprising an explosion-proof structure of the oil immersed transformer according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311267011.1A CN117116618A (en) | 2023-09-27 | 2023-09-27 | Oil immersed transformer and explosion-proof structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311267011.1A CN117116618A (en) | 2023-09-27 | 2023-09-27 | Oil immersed transformer and explosion-proof structure thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117116618A true CN117116618A (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311267011.1A Pending CN117116618A (en) | 2023-09-27 | 2023-09-27 | Oil immersed transformer and explosion-proof structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117116618A (en) |
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2023
- 2023-09-27 CN CN202311267011.1A patent/CN117116618A/en active Pending
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