Oil conservator and oil-immersed transformer

Abstract

The invention discloses an oil conservator and an oil-immersed transformer, which can ensure that the height space occupied by the oil conservator is smaller and reduce the overall height of the oil-immersed transformer under the condition that the oil conservator has higher volume. The oil conservator comprises a cabinet body (11). The cabinet body (11) is arranged above the transformer body, and the interior of the cabinet body (11) is used for containing transformer oil. The cross section of the cabinet body (11) is in an N-polygon shape, the height of the N-polygon shape is smaller than the diameter of a circle with the same area as the N-polygon shape, N is a positive integer, and N is larger than or equal to 5 and smaller than or equal to 9. The cabinet body (11) comprises a top plate, N-3 side plates, a first bottom plate and a second bottom plate, the top plate is horizontally arranged, one end of the first bottom plate is connected with one end of the second bottom plate, and the end, away from the second bottom plate, of the first bottom plate is connected with one end of the top plate through at least one side plate after being obliquely upwards expanded outwards; the end, away from the first bottom plate, of the second bottom plate is connected with the other end of the top plate through at least one side plate after obliquely upwards expanding outwards.

Description

Technical Field

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

[0002] Oil-immersed transformers use transformer oil as insulating liquid and cooling liquid. The oil conservator, as an important storage container for transformer oil, needs to compensate for the volume change of transformer oil and isolate oil and air to prevent deterioration. At the same time, the oil conservator is usually set on the upper part of the transformer body and also has the function of providing oil level difference, promoting transformer oil flow and heat dissipation.

[0003] The commonly used oil conservator is a capsule type oil conservator. The capsule is set inside the oil conservator. The volume of the capsule is adjusted to adjust the volume of the transformer oil discharged by the capsule, thereby compensating for the change in the volume of the transformer oil when the transformer is working. In order to ensure the effective flow of transformer oil in the transformer and ensure the heat dissipation effect, the minimum height of the oil level in the oil conservator must be greater than the maximum height of the plate radiator.

[0004] At present, conventional oil storage cabinets adopt cylindrical cabinets. When the transformer is running cold, the oil temperature is much lower than the normal working temperature. Due to thermal expansion and contraction, the oil level in the transformer is much lower than the oil level under normal working conditions. In order to compensate for the change of oil level and ensure the minimum oil level, a greater demand is put forward for the effective capacity of the oil storage cabinet, that is, the overall volume of the cylindrical cabinet needs to be increased, which requires increasing the diameter of the cylindrical cabinet, resulting in a larger height space occupied by the cylindrical cabinet and causing the overall height of the transformer to be too high, which is not conducive to the transportation and lifting operation of the transformer.

[0005] In addition, in the prior art, auxiliary equipment of the oil conservator (such as various pipelines, etc.) is usually arranged on the top of the oil conservator body, which further increases the height space occupied by the oil conservator and further causes the overall height of the transformer to be too high. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an oil conservator and an oil-immersed transformer in view of the above-mentioned deficiencies in the prior art, which can reduce the height space occupied by the oil conservator while ensuring that the oil conservator has a high volume, thereby reducing the overall height of the oil-immersed transformer.

[0007] In a first aspect, an embodiment of the present invention provides an oil storage cabinet, which includes a cabinet body. The cabinet body is arranged above the transformer body, and its interior is used to accommodate transformer oil. The cross-section of the cabinet body is in the shape of an N-gon, and the height of the N-gon is less than the diameter of a circle with the same area as the N-gon, where N is a positive integer, and 5≤N≤9. The cabinet body includes a top plate, N-3 side plates, a first bottom plate, and a second bottom plate, the top plate is arranged horizontally, one end of the first bottom plate and one end of the second bottom plate are connected to each other, one end of the first bottom plate away from the second bottom plate is obliquely expanded upward and then connected to one end of the top plate through at least one side plate, and one end of the second bottom plate away from the first bottom plate is obliquely expanded upward and then connected to the other end of the top plate through at least one side plate.

[0008] In some embodiments, the polygon is a pentagon; the number of the side panels is two, and the end of the first bottom plate away from the second bottom plate is obliquely expanded upward and outward and then connected to one end of the top plate through a side panel, and the end of the second bottom plate away from the first bottom plate is obliquely expanded upward and outward and then connected to the other end of the top plate through another side panel.

[0009] In some embodiments, the oil storage cabinet further comprises a capsule assembly, the capsule assembly is arranged inside the cabinet, and the capsule assembly comprises a capsule holder slide rail, a capsule holder and a capsule. The capsule holder slide rail is fixed to the lower surface of the top plate; the capsule holder slide rail extends along the axial direction of the cabinet. The capsule holder is slidably connected to the capsule holder slide rail. The capsule is connected to the capsule holder, and the volume of the capsule can be changed.

[0010] In some embodiments, the capsule holder is provided with a plurality of pulleys, which are rollingly arranged on the capsule holder slide rail.

[0011] In some embodiments, the capsule support is provided with a plurality of capsule hooks, and the capsule hooks are in the shape of a multi-layered ring. The top of the capsule is provided with a plurality of mounting holes, and the capsule hooks can be inserted into the mounting holes.

[0012] In some embodiments, the oil storage cabinet further comprises a cabinet cover, which is disposed on one end surface of the cabinet body. A capsule limiting plate is disposed on the lower surface of the top plate near the cabinet cover, and a first positioning hole is disposed on the capsule limiting plate; a support positioning plate and a positioning rod are disposed on the end of the capsule holder near the cabinet cover, and a second positioning hole is disposed on the support positioning plate, and the positioning rod can fix the capsule holder on the capsule limiting plate after passing through the first positioning hole and the second positioning hole.

[0013] In some embodiments, the oil storage cabinet further includes a booster assembly. The booster assembly includes a booster pump and a first connecting pipe. The booster pump is fixed to the outside of the first side plate and is used to transport external air to the inside of the capsule. One end of the first connecting pipe is connected to the booster pump, and the other end is connected to the inside of the capsule.

[0014] In some embodiments, the boosting assembly further includes an oil level sensor and a first controller. The oil level sensor is fixed on a side wall of the cabinet, and is used to detect the oil level of the transformer oil in the cabinet and output a first detection signal. The first controller is electrically connected to the oil level sensor and the boosting pump, respectively, and is used to receive the first detection signal of the oil level sensor, and control the start and stop of the boosting pump according to the first detection signal, so as to control the boosting pump to start when the oil level of the transformer oil in the cabinet reaches a first oil level, and to control the boosting pump to stop when the oil level of the transformer oil in the cabinet reaches a second oil level.

[0015] In some embodiments, the boosting assembly further includes an oil temperature sensor and a second controller. The oil temperature sensor is disposed inside the cabinet, and is used to detect the temperature of the transformer oil in the cabinet and output a second detection signal. The second controller is electrically connected to the oil temperature sensor and the boosting pump, respectively, and is used to receive the second detection signal of the oil temperature sensor, and control the start and stop of the boosting pump according to the second detection signal, so as to control the boosting pump to start when the temperature of the transformer oil in the cabinet reaches a first temperature, and to control the boosting pump to stop when the temperature of the transformer oil in the cabinet reaches a second temperature.

[0016] In some embodiments, a desiccant device is provided on the first connecting pipe, and the interior of the desiccant device is filled with desiccant material for drying the air flowing through the first connecting pipe.

[0017] In some embodiments, the first connecting pipe is further provided with a deflation plug, which is provided on a portion of the first connecting pipe between the moisture absorbing device and the top plate, and is used to exhaust the air from the capsule.

[0018] In some embodiments, the oil storage cabinet further includes an oil tank pipeline. The oil tank pipeline includes a second connecting pipe and a gas relay. The second connecting pipe is arranged between the first bottom plate and the transformer body; one end of the second connecting pipe passes through the first bottom plate or the second bottom plate and is connected to the interior of the cabinet, and the other end is connected to the top of the transformer body. The gas relay is arranged on the second connecting pipe and is used to monitor the gas composition in the second connecting pipe.

[0019] In some embodiments, the oil storage cabinet further includes a filter assembly; the filter assembly includes a second connecting pipe, an oil pump and a filter. The second connecting pipe is arranged directly below the connection between the first bottom plate and the second bottom plate, and both ends of the second connecting pipe are connected to the interior of the cabinet. The oil pump is arranged on the second connecting pipe to drive the transformer oil in the second connecting pipe to flow. The filter is arranged on the second connecting pipe to filter the transformer oil.

[0020] In some embodiments, the oil conservator further comprises an oil conservator bracket, wherein the oil conservator bracket is fixed above the transformer body, a V-shaped groove is formed on the top of the oil conservator bracket, and the first bottom plate and the second bottom plate of the cabinet body are fixed in the V-shaped groove.

[0021] Therefore, the oil storage cabinet provided in the embodiment of the present invention sets the cross-sectional shape of the cabinet body to an N-gon, and makes the height of the N-gon smaller than the diameter of a circle with the same area as the N-gon. Compared with the cylindrical oil storage cabinet, when the length and volume of the cabinet body are the same, the N-gon cabinet body in this embodiment has a smaller height. Therefore, when the cabinet body has a higher volume, the height space occupied by the cabinet body is smaller, thereby reducing the height of the oil storage cabinet. By making one end of the first bottom plate away from the second bottom plate expand obliquely upward and outward and then connect to one end of the top plate through at least one side plate, and by making one end of the second bottom plate away from the first bottom plate expand obliquely upward and outward and then connect to the other end of the top plate through at least one side plate, the first bottom plate and the second bottom plate can be arranged obliquely. Compared with the arc-shaped bottom of the cylindrical oil conservator, the lower sides of the first bottom plate and the second bottom plate have more idle space for installing auxiliary equipment of the oil conservator such as oil tank pipelines. Compared with the prior art, the height space occupied by the auxiliary equipment of the oil conservator can be reduced, thereby further reducing the overall height of the oil conservator, further reducing the overall height of the oil-immersed transformer, and facilitating the transportation and lifting operations of the oil-immersed transformer.

[0022] In a second aspect, an embodiment of the present invention further provides an oil-immersed transformer, the oil-immersed transformer comprising a transformer body and the oil conservator in the first aspect, wherein the oil conservator is arranged above the transformer body.

[0023] The oil-immersed transformer provided in the embodiment of the present invention has the same beneficial effects as the above-mentioned oil storage cabinet, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 : A structural diagram of an oil storage cabinet provided by an embodiment of the present invention;

[0025] Figure 2 : A structural diagram of the interior of an oil storage cabinet provided by an embodiment of the present invention;

[0026] Figure 3: A cross-sectional view of an oil storage cabinet provided by an embodiment of the present invention;

[0027] Figure 4 : A structural diagram of a capsule support provided by an embodiment of the present invention;

[0028] Figure 5 : A structural diagram of another oil storage cabinet provided by an embodiment of the present invention;

[0029] Figure 6 : A structural diagram of an oil storage cabinet bracket provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0031] Embodiment 1:

[0032] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an oil conservator 1, which is applied to an oil-immersed transformer to store transformer oil and compensate for changes in the volume of transformer oil. The oil conservator 1 includes a cabinet 11. The cabinet 11 is arranged above the transformer body, and the interior thereof is used to accommodate transformer oil.

[0033] During the operation of the oil-immersed transformer, the total volume of the transformer oil inside the oil-immersed transformer will change due to temperature changes, and the volume of the transformer body cannot be changed. When the total volume of the transformer oil inside the oil-immersed transformer changes, a part of the transformer oil in the transformer body will enter the cabinet 11, or a part of the transformer oil in the cabinet 11 will enter the transformer body. In addition, the height of the cabinet 11 is higher than the transformer body, and the less transformer oil stored in the cabinet 11 can increase the overall oil level height in the oil-immersed transformer, so that the overall oil level in the oil-immersed transformer is kept above the maximum height of the plate radiator, ensuring the normal heat dissipation effect of the plate radiator.

[0034] In some examples, such as Figure 3 As shown, a plug seat 12 and a hanging plate 13 are provided on the cabinet body 11 .

[0035] The number of plug seats 12 can be 2-4, and the plug seats 12 include a plug seat base 121 and a plug 122. The plug seat base 121 is located at a position of the top plate close to the two end surfaces of the cabinet 11, and the first bottom plate and / or the second bottom plate are close to the two end surfaces of the cabinet 11. The plug seat base 121 is connected to the cabinet 11 by welding.

[0036] There are two hanging plates 13 , which are located on the center line of the upper surface of the top plate and are symmetrically distributed.

[0037] like Figure 1 and Figure 2 As shown, the cross-section of the cabinet 11 is in the shape of an N-gon, the height of which is less than the diameter of a circle of the same area as the N-gon, where N is a positive integer, and 5≤N≤9. The cabinet 11 includes a top plate, N-3 side plates, a first bottom plate, and a second bottom plate, the top plate is arranged horizontally, one end of the first bottom plate and one end of the second bottom plate are connected to each other, one end of the first bottom plate away from the second bottom plate is obliquely expanded upward and then connected to one end of the top plate through at least one side plate, and one end of the second bottom plate away from the first bottom plate is obliquely expanded upward and then connected to the other end of the top plate through at least one side plate.

[0038] It should be noted that the N-gon is a convex N-gon.

[0039] Exemplarily, the N-gon may also be a pentagon, a heptagon, a nonagon, or the like.

[0040] Exemplarily, the lengths of the multiple sides of the N-gon may be the same or different. The N-gon may be a regular N-gon or may not be a regular N-gon.

[0041] By making the height of the N-gon smaller than the diameter of a circle with the same area as the N-gon, compared with the cylindrical oil conservator 1, when the length and volume of the cabinet 11 are the same, the N-gon cabinet 11 in this embodiment has a smaller height, so the height space occupied by the oil conservator 1 can be smaller, thereby reducing the overall height of the oil-immersed transformer and facilitating the transportation and hoisting operations of the oil-immersed transformer.

[0042] It can be understood that the first bottom plate and the second bottom plate are arranged to be inclined upward, and the connection between the first bottom plate and the second bottom plate is located at the lowest point of the cabinet 11, and the top plate of the cabinet 11 is located at the highest point of the cabinet 11.

[0043] Furthermore, because the first bottom plate and the second bottom plate are inclined, compared with the arc-shaped bottom of the cylindrical oil conservator 1, the lower sides of the first bottom plate and the second bottom plate have more idle space for installing auxiliary equipment of the oil conservator 1 (such as the oil tank pipeline 5 described below). Compared with the prior art, the height space occupied by the auxiliary equipment of the oil conservator 1 can be reduced, and the upper space of the oil conservator 1 can be optimized, thereby reducing the overall height of the oil conservator 1, reducing the overall height of the oil-immersed transformer, and facilitating the transportation and hoisting operations of the oil-immersed transformer.

[0044] Therefore, the oil conservator 1 provided in the embodiment of the present invention, by setting the cross-sectional shape of the cabinet body 11 to an N-gon, and making the height of the N-gon smaller than the diameter of a circle with the same area as the N-gon, compared with the cylindrical oil conservator 1, when the length and volume of the cabinet body 11 are the same, the N-gon cabinet body 11 in this embodiment has a smaller height, so that the cabinet body 11 can have a smaller height space when the cabinet body 11 has a higher volume, thereby reducing the height of the oil conservator 1. By making one end of the first bottom plate away from the second bottom plate expand obliquely upward and outward and then connect to one end of the top plate through at least one side plate, and by making one end of the second bottom plate away from the first bottom plate expand obliquely upward and outward and then connect to the other end of the top plate through at least one side plate, the first bottom plate and the second bottom plate can be arranged obliquely. Compared with the arc-shaped bottom of the cylindrical oil conservator 1, the lower sides of the first bottom plate and the second bottom plate have more idle space for installing auxiliary equipment of the oil conservator 1 (such as the oil tank pipeline 5). Compared with the prior art, the height space occupied by the auxiliary equipment of the oil conservator 1 can be reduced, thereby further reducing the overall height of the oil conservator 1, further reducing the overall height of the oil-immersed transformer, and facilitating the transportation and hoisting operations of the oil-immersed transformer.

[0045] In some embodiments, Figure 1 and Figure 2 As shown, the N-gon is a pentagon. There are two side panels, one end of the first bottom panel away from the second bottom panel is diagonally expanded upward and connected to one end of the top panel through a side panel, and one end of the second bottom panel away from the first bottom panel is diagonally expanded upward and connected to the other end of the top panel through another side panel.

[0046] Exemplarily, the sides of the pentagon are equal in length.

[0047] Furthermore, the pentagon is a longitudinally compressed regular pentagon, and compared with an uncompressed regular pentagon, the height of the pentagon can be made smaller than that of the regular pentagon, so that the pentagon can be flatter, thereby reducing the height of the cabinet 11. In this case, it has been verified that the height of the cabinet 11 can be reduced by about 20% compared with a circle with the same cross-sectional area.

[0048] Through the above arrangement, the number of side panels is small, thereby reducing the difficulty of processing the cabinet body 11 .

[0049] In the prior art, capsule oil storage cabinets require operators to drill into the cabinet to install capsule hooks, which is very inconvenient. The hooks at the deepest part of the cabinet are often missed. After long-distance transportation, the capsules are easily curled and deformed, affecting the use of oil-immersed transformers.

[0050] Based on this, in some embodiments, such as Figure 3 and Figure 4As shown, the oil storage cabinet 1 further includes a capsule assembly 19, which is arranged inside the cabinet 11. The capsule assembly 19 includes a capsule holder slide rail 191, a capsule holder 6 and a capsule. The capsule holder slide rail 191 is fixed to the lower surface of the top plate; the capsule holder slide rail 191 extends along the axial direction of the cabinet 11. The capsule holder 6 is slidably connected to the capsule holder slide rail 191. The capsule is connected to the capsule holder 6, and the volume of the capsule can be changed.

[0051] Exemplarily, the capsule holder slide rails 191 are bent flat steels, two of which form a group with a gap in between, and two groups are symmetrically distributed on the lower surface of the top plate.

[0052] The capsule holder 6 is used to mount the capsule.

[0053] Exemplarily, the capsule is made of a flexible material, and the interior of the capsule is connected to the external air, so that the gas outside the capsule in the cabinet 11 can be isolated from the external air.

[0054] The working principle of the capsule is as follows: when the temperature of the transformer oil rises, the volume of the transformer oil expands, the gas pressure outside the capsule in the cabinet 11 increases, the capsule is squeezed to exhaust air to make it shrink, so that the gas pressure outside the capsule in the cabinet 11 is reduced, the air pressure inside and outside the capsule is maintained stable, and the transformer oil in the transformer body is facilitated to flow back into the cabinet 11; when the oil temperature decreases, the volume of the transformer oil decreases, the volume of the gas outside the capsule in the cabinet 11 increases and the pressure decreases, and gas is filled into the capsule to make it expand, which can compensate for the change in the volume of the gas outside the capsule in the cabinet 11, maintain the air pressure of the gas outside the capsule in the cabinet 11, thereby maintaining the air pressure inside and outside the capsule stable, and facilitating the transformer oil in the cabinet 11 to flow back into the transformer body.

[0055] Through the above arrangement, it is easy to pull the capsule holder 6 out of the capsule holder slide rail 191, so that the operator can install the capsule on the capsule holder 6 outside the cabinet 11, reducing the difficulty of the operator's operation. After the capsule is installed, the capsule can be sent into the cabinet 11 by sliding the capsule holder 6, which reduces the difficulty of installing the capsule, thereby reducing the probability of errors made by the operator when installing the capsule to a certain extent.

[0056] In some embodiments, Figure 4 As shown, a plurality of pulleys 64 are provided on the capsule holder 6. The plurality of pulleys 64 are rollingly arranged on the capsule holder slide rail 191.

[0057] Exemplarily, the positions of the multiple pulleys 64 on the capsule holder 6 correspond to the capsule holder slide rail 191. The multiple pulleys 64 on the capsule holder 6 are inserted through the gap in the middle of the capsule holder slide rail 191 and pressed on the upper surface of the capsule holder slide rail 191, so that the capsule holder 6 can slide on the capsule holder slide rail 191 through the pulleys 64, so that the capsule can be pushed into the oil storage cabinet 1.

[0058] Through the above arrangement, the resistance of the capsule holder 6 sliding on the capsule holder slide rail 191 can be reduced.

[0059] In some embodiments, Figure 4 As shown, a plurality of capsule hooks 63 are provided on the capsule support 6, and the shape of the capsule hooks 63 is a multi-layered ring. A plurality of mounting holes are provided on the top of the capsule, and the capsule hooks 63 can be inserted into the mounting holes.

[0060] For example, Figure 4 As shown, the capsule support 6 includes a longitudinal flat steel 61 , a transverse round steel 62 , and a capsule hook 63 .

[0061] The longitudinal flat steel 61 and the transverse round steel 62 are welded in the normal direction to form a mesh support structure. The spacing and number of the longitudinal flat steels 61 are determined by the spacing between the capsule holder slide rails 191. If the spacing between the capsule holder slide rails 191 is large, the spacing of the longitudinal flat steels 61 can be set larger and the number can be set larger. The welding position and spacing of the transverse round steels 62 are determined by the length of the capsule holder slide rails 191. If the length of the capsule holder slide rails 191 is long, the spacing between two adjacent transverse round steels 62 can be set larger.

[0062] The capsule hook 63 is welded to the corresponding position of the transverse round steel 62 according to the position of the mounting hole on the capsule.

[0063] The pulleys 64 are welded to the upper part of the longitudinal flat steel 61 and are evenly distributed along the longitudinal flat steel 61 on both sides.

[0064] Exemplarily, the capsule hook 63 is in the shape of a bent paper clip.

[0065] Through the above arrangement, the capsules can be fixed by a plurality of capsule hooks 63 to prevent the capsules from falling off the capsule hooks 63, thereby preventing the capsules from curling and deforming during transportation.

[0066] In some embodiments, Figure 3 As shown, the oil storage cabinet 1 further includes a cabinet cover 18, which is disposed on one end surface of the cabinet body 11. A capsule stop plate 192 is disposed on the lower surface of the top plate near the cabinet cover 18, and a first positioning hole is disposed on the capsule stop plate 192. Figure 4 As shown, a bracket positioning plate 65 and a positioning rod are provided at one end of the capsule bracket 6 close to the cabinet cover 18, and a second positioning hole is provided on the bracket positioning plate 65. After the positioning rod passes through the first positioning hole and the second positioning hole, the capsule bracket 6 can be fixed on the capsule limiting plate 192.

[0067] Exemplarily, the outer edge of one end face of the cabinet body 11 forms a cabinet cover flange 17, and holes are evenly opened on the cabinet cover flange 17. The cabinet cover 18 is opened with holes, and the positions of the holes on the cabinet cover 18 correspond to the cabinet cover flange 17. The cabinet cover 18 is connected to the cabinet cover flange 17 by fastening bolts. A sealing gasket is also arranged between the cabinet cover 18 and the cabinet cover flange 17.

[0068] Exemplarily, the capsule limiting plate 192 is a steel plate with holes, and the capsule limiting plate 192 is welded to the lower surface of the top plate.

[0069] Exemplarily, the positioning rod may be a bolt.

[0070] Through the above arrangement, the capsule holder 6 can be fixed on the capsule limiting plate 192 to maintain the stability of the position of the capsule holder 6 and prevent the capsule holder 6 from sliding during transportation, thereby ensuring the stability of the capsule.

[0071] In some embodiments, in combination Figure 1 and Figure 5 The oil storage tank 1 further includes a booster assembly 4. The booster assembly 4 includes a booster pump 46 and a first connecting pipe. The booster pump 46 is fixed to the outside of the first side plate and is used to transport external air to the inside of the capsule. One end of the first connecting pipe is connected to the booster pump 46, and the other end is connected to the inside of the capsule.

[0072] For example, Figure 3 As shown, a booster pump support plate 14 is disposed on the outer side of a side plate of the cabinet 11 , and the booster pump 46 is fixed on the booster pump support plate 14 .

[0073] For example, Figure 3 As shown, a moisture absorption and pressurization pipeline connecting pipe 16 is arranged on the top plate, and the moisture absorption and pressurization pipeline connecting pipe 16 includes a first connecting pipe 161 and a first flange 162. The first connecting pipe 161 is located at the center of the upper surface of the top plate, and the first connecting pipe 161 is connected to the inside of the capsule. The first flange 162 is arranged on the first connecting pipe 161, which is a circular flange with an annular opening, and a sealing gasket groove is provided on its upper surface.

[0074] In some examples, a moisture absorbing device 44 is provided on the first connecting pipe, and the interior of the moisture absorbing device 44 is filled with moisture absorbing material for drying the air flowing through the first connecting pipe.

[0075] like Figure 5 As shown, the first connecting pipe includes a second flange 41, a fourth connecting pipe 42, a third flange 43, and a fifth connecting pipe 45 which are connected in sequence.

[0076] Combination Figure 3 and Figure 5The second flange 41 is connected to the first flange 162 by fastening bolts. A sealing gasket is provided between the second flange 41 and the first flange 162. The sealing gasket is arranged in a sealing gasket groove on the upper surface of the sealing gasket. The sealing gasket is made of high-quality nitrile rubber or acrylic ester.

[0077] The desiccant device 44 is arranged between the third flange 43 and the fifth connecting pipe 45. The desiccant device 44 is a cylindrical container filled with water-absorbing silica gel. The upper part is connected to the third flange 43 through a connecting hole, and the lower part is provided with a breathing hole. The desiccant device 44 is connected to the fifth connecting pipe 45 through the breathing hole.

[0078] The fifth connecting pipe 45 is in communication with the boosting pump 46 .

[0079] Exemplarily, the booster pump 46 is a small gas pump, which is started when the oil level in the transformer body is low, pumps air into the capsule and pressurizes it. The pumped air enters the capsule through the fifth connecting pipe 45, the moisture absorption device 44 and the fourth connecting pipe 42, so that the volume of the capsule becomes larger, the pressure of the air in the oil storage cabinet increases, and the transformer oil in the oil storage cabinet is pressurized, so that the transformer oil in the cabinet 11 can flow back to the transformer body.

[0080] For the transformer body, each 1000Pa increase in the pressure of the transformer oil in the oil conservator is equivalent to increasing the oil level in the oil conservator 1 by about 125mm, which brings about the effect of maintaining the oil level stable.

[0081] Through the above arrangement, air can be input into the capsule through the booster pump 46 to adjust the volume of the capsule, so that the transformer oil in the cabinet 11 flows back into the transformer body, thereby maintaining the stability of the oil level inside the oil-immersed transformer.

[0082] In some embodiments, Figure 2 As shown, the boosting assembly 4 also includes an oil level sensor 47 and a first controller. The oil level sensor 47 is fixed on a side plate of the cabinet 11, and is used to detect the oil level of the transformer oil in the cabinet 11 and output a first detection signal. The first controller is electrically connected to the oil level sensor 47 and the boosting pump 46, respectively, and is used to receive the first detection signal of the oil level sensor 47, and control the start and stop of the boosting pump 46 according to the first detection signal, so as to control the boosting pump 46 to start when the oil level of the transformer oil in the cabinet 11 reaches the first oil level, and to control the boosting pump 46 to stop when the oil level of the transformer oil in the cabinet 11 reaches the second oil level.

[0083] Exemplarily, the oil storage tank 1 further includes an oil level gauge 15, which is disposed on one end face of the cabinet 11, and includes a dial 151, a connecting rod 152, and a floating ball 153. The dial 151 is located on the outside of the cabinet 11, and the connecting rod 152 and the floating ball 153 are located on the inside of the cabinet 11. The oil level in the cabinet 11 can be quickly obtained through the oil level gauge 15.

[0084] Exemplarily, the second oil level is an alarm oil level, which is generally slightly higher than the oil level of the fin radiator, at which point the oil level can maintain the normal heat dissipation effect of the fin radiator. The first oil level can be the same as the second oil level, or slightly lower than the second oil level.

[0085] Exemplarily, when the oil level of the transformer oil in the cabinet 11 reaches a first oil level, the first controller sends a first control signal to the booster pump 46 to control the booster pump 46 to start pumping air into the capsule, and the capsule expands, which is conducive to the transformer oil in the cabinet 11 to flow back to the transformer body; when the oil level of the transformer oil in the cabinet 11 reaches a second oil level, the oil level is relatively high, and the oil level height at this time can maintain the normal heat dissipation effect of the plate radiator. The first controller sends a second control signal to the booster pump 46 to control the booster pump 46 to stop.

[0086] Through the above arrangement, the start and stop of the booster pump 46 can be automatically controlled by the first controller to maintain the air pressure inside and outside the capsule stable, thereby facilitating the flow of transformer oil in the cabinet 11 .

[0087] In other embodiments, the boosting assembly 4 further includes an oil temperature sensor and a second controller. The oil temperature sensor is disposed inside the cabinet 11, and is used to detect the temperature of the transformer oil in the cabinet 11 and output a second detection signal. The second controller is electrically connected to the oil temperature sensor and the boosting pump 46, respectively, and is used to receive the second detection signal of the oil temperature sensor, and control the start and stop of the boosting pump 46 according to the second detection signal, so as to control the boosting pump 46 to start when the temperature of the transformer oil in the cabinet 11 reaches the first temperature, and to control the boosting pump 46 to stop when the temperature of the transformer oil in the cabinet 11 reaches the second temperature.

[0088] It can be understood that when the oil-immersed transformer is working, there is a certain corresponding relationship between the temperature and volume of the transformer oil.

[0089] Exemplarily, the second temperature is the temperature of the transformer oil corresponding to the second oil level, and the first temperature is the temperature of the transformer oil corresponding to the first oil level.

[0090] Exemplarily, when the temperature of the transformer oil in the cabinet 11 reaches the first temperature, it indicates that the oil level of the transformer oil in the cabinet 11 is low, and the second controller sends a third control signal to the boost pump 46 to control the boost pump 46 to start pumping air into the capsule, so that the capsule expands, which is beneficial for the transformer oil in the cabinet 11 to flow back into the transformer body; when the temperature of the transformer oil in the cabinet 11 reaches the second temperature, the oil level of the transformer oil in the cabinet 11 is high, and the oil level at this time can maintain the normal heat dissipation effect of the plate radiator, and the second controller sends a fourth control signal to the boost pump 46 to control the boost pump 46 to stop.

[0091] Through the above arrangement, the start and stop of the booster pump 46 can be automatically controlled by the second controller to maintain the air pressure inside and outside the capsule stable, thereby facilitating the flow of transformer oil in the cabinet 11 .

[0092] In some embodiments, Figure 5 As shown, the first connecting pipe is also provided with a degassing plug 421. The degassing plug 421 is provided on the portion of the first connecting pipe between the moisture absorbing device 44 and the top plate, and is used for degassing the capsule.

[0093] For example, Figure 5 As shown, the fourth connecting pipe 42 is welded to the central circular hole of the second flange 41. The fourth connecting pipe 42 is a seamless steel pipe bent into a U shape, and a hole is opened upward at the first bend and connected to a vent plug 421, which is used for venting the capsule during the oil storage cabinet 1 filling process. A sealing gasket is provided between the vent plug 421 and the fourth connecting pipe 42.

[0094] Through the above arrangement, it is convenient to discharge the air in the capsule, thereby changing the volume of the capsule.

[0095] In some embodiments, Figure 5 As shown, the oil storage cabinet 1 also includes an oil tank pipeline 5. The oil tank pipeline 5 includes a second connecting pipe and a gas relay 54. The second connecting pipe is arranged between the first bottom plate and the transformer body. One end of the second connecting pipe passes through the first bottom plate or the second bottom plate and is connected to the inside of the cabinet 11, and the other end is connected to the top of the transformer body. The gas relay 54 is arranged on the second connecting pipe and is used to monitor the gas composition in the second connecting pipe.

[0096] The second connecting pipe can make the transformer oil in the oil conservator 1 and the transformer oil in the transformer body communicate with each other, so that the transformer oil in the oil conservator 1 can compensate for the transformer oil in the transformer body.

[0097] For example, Figure 5 As shown, the oil tank pipeline 5 includes a sixth connecting pipe 51 , a fourth flange 52 , a butterfly valve 53 , a fifth flange 55 and a seventh connecting pipe 56 , and a gas relay 54 is arranged between the butterfly valve 53 and the fifth flange 55 .

[0098] The sixth connecting pipe 51 is a seamless steel pipe, and the sixth connecting pipe 51 is welded to the first bottom plate or the second bottom plate. After the sixth connecting pipe 51 is bent, the other parts of the oil tank pipeline 5 occupy the side lower space of the cabinet body 11, which can optimize the overall layout and occupied space of the oil storage cabinet 1.

[0099] The fourth flange 52 is welded to the sixth connecting pipe 51 and connected with the butterfly valve 53, the gas relay 54 and the fifth flange 55 by fastening bolts. The butterfly valve 53 is used to close the pipeline between the cabinet 11 and the transformer body for easy disassembly.

[0100] The gas relay 54 is used to monitor the generation of abnormal gas during the operation of the transformer. When abnormal gas is detected, an alarm can be generated to remind the operator.

[0101] The seventh connecting pipe 56 is a seamless steel pipe bent into an L-shape. One end of the seventh connecting pipe 56 is welded to the fifth flange 55 , and the other end is connected to the box cover of the transformer body.

[0102] Through the above arrangement, the cabinet 11 is connected with the transformer body, and the gas composition in the second connecting pipe is monitored through the gas relay 54, so as to timely discover abnormal conditions inside the oil-immersed transformer.

[0103] In some embodiments, Figure 5 As shown, the oil storage cabinet 1 also includes a filter assembly. The filter assembly includes a second connecting pipe, an oil pump and a filter. The second connecting pipe is arranged directly below the connection between the first bottom plate and the second bottom plate, and both ends of the second connecting pipe are connected to the interior of the cabinet body 11. The oil pump is arranged on the second connecting pipe to drive the transformer oil in the second connecting pipe to flow. The filter is arranged on the second connecting pipe to filter the transformer oil.

[0104] Exemplarily, the oil pump and filter are integrated in Figure 5 The second connecting pipe includes a second connecting pipe 31 and a third connecting pipe 33. The second connecting pipe 31 and the third connecting pipe 33 are seamless steel pipes, and are bent into an L shape. One end of the second connecting pipe 31 is welded to the filtering device 32, and the other end is welded to the first bottom plate or the second bottom plate; one end of the third connecting pipe 33 is welded to the filtering device 32, and the other end is welded to the first bottom plate or the second bottom plate.

[0105] Exemplarily, the second connecting pipe 31 or the third connecting pipe 33 is also provided with a butterfly valve.

[0106] The filter device 32 is a cylindrical container, and an inlet filter, a gear oil pump, a high-mesh filter, activated carbon and graphene, and an outlet filter are arranged inside. During the normal operation of the oil-immersed transformer, the gear oil pump starts to operate, and the transformer oil in the cabinet 11 is sucked into the filter device 32. After filtering by the filter and adsorbed by activated carbon and graphene, the micron-level wood chips, paper scraps, iron filings and other impurities in the transformer oil are effectively filtered and removed, thereby avoiding abnormal discharge during the operation of the oil-immersed transformer, reducing the deterioration rate of the transformer oil, and effectively improving the reliability of the equipment operation.

[0107] In some embodiments, Figure 1 and Figure 6 As shown, the oil conservator 1 further includes an oil conservator bracket 2. The oil conservator bracket 2 is fixed above the transformer body, and a V-shaped groove is formed on the top of the oil conservator bracket 2. The first bottom plate and the second bottom plate of the cabinet body 11 are fixed in the V-shaped groove.

[0108] Exemplarily, the oil storage cabinet bracket 2 is located below the cabinet body 11 , and two are generally provided, distributed at symmetrical positions on both sides of the center line of the cabinet body 11 .

[0109] like Figure 6 As shown, the oil storage cabinet bracket 2 includes a bracket side plate 21 , a bracket bottom plate 22 and a bracket reinforcement plate 23 .

[0110] The bracket side plate 21 is a steel plate bent into a U-shape, and is provided with a V-shaped notch to be welded to the first bottom plate and the second bottom plate of the cabinet body 11 .

[0111] The bracket bottom plate 22 is a flat steel plate, a round hole or an oblong hole is opened on the bracket bottom plate 22, and the bracket bottom plate 22 is connected with the transformer body by fastening bolts.

[0112] The support reinforcement plate 23 is a flat steel and is used to enhance the overall strength of the oil storage cabinet support 2 .

[0113] Through the above arrangement, the cabinet 11 can be stably fixed on the transformer body.

[0114] Embodiment 2:

[0115] The embodiment of the present invention further provides an oil-immersed transformer, which includes a transformer body and the oil conservator 1 in Embodiment 1. The oil conservator 1 is arranged above the transformer body.

[0116] Compared with the cylindrical oil conservator in the prior art, the oil conservator 1 in the embodiment of the present invention has a lower height, thereby reducing the overall height of the oil-immersed transformer; and there is more idle space at the lower side of the oil conservator 1 to install the auxiliary equipment of the oil conservator 1, which can reduce the height space occupied by the auxiliary equipment of the oil conservator 1, thereby further reducing the overall height of the oil conservator 1, further reducing the overall height of the oil-immersed transformer, and facilitating the transportation and hoisting operations of the oil-immersed transformer.

[0117] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An oil storage cabinet, characterized in that: comprising a cabinet (11); The cabinet (11) is arranged above the transformer body, and its interior is used to contain transformer oil; The cross-section of the cabinet (11) is in the shape of an N-gon, the height of the N-gon being smaller than the diameter of a circle having the same area as the N-gon, wherein N is a positive integer and 5≤N≤9; The cabinet (11) comprises a top plate, N-3 side plates, a first bottom plate and a second bottom plate, wherein the top plate is arranged horizontally, one end of the first bottom plate and one end of the second bottom plate are connected to each other, one end of the first bottom plate away from the second bottom plate is obliquely expanded upward and outward and then connected to one end of the top plate through at least one side plate, and one end of the second bottom plate away from the first bottom plate is obliquely expanded upward and outward and then connected to the other end of the top plate through at least one side plate.

2. The oil storage tank according to claim 1, characterized in that: The polygon is a pentagon; There are two side panels, one end of the first bottom panel away from the second bottom panel is obliquely expanded upward and outward and then connected to one end of the top panel through a side panel, and one end of the second bottom panel away from the first bottom panel is obliquely expanded upward and outward and then connected to the other end of the top panel through another side panel.

3. The oil storage tank according to claim 2, characterized in that: It also includes a capsule assembly (19), which is arranged inside the cabinet (11), and includes: A capsule holder slide rail (191) is fixed on the lower surface of the top plate; the capsule holder slide rail (191) extends along the axial direction of the cabinet (11); a capsule holder (6) slidably connected to the capsule holder slide rail (191); and A capsule is connected to the capsule support (6), and the volume of the capsule can be changed.

4. The oil storage tank according to claim 3, characterized in that: The capsule support (6) is provided with a plurality of pulleys (64); The plurality of pulleys (64) are rollingly arranged on the capsule support slide rail (191).

5. The oil storage tank according to claim 3, characterized in that: The capsule support (6) is provided with a plurality of capsule hooks (63), and the capsule hooks (63) are in the shape of a multi-layered ring; The top of the capsule is provided with a plurality of mounting holes, and the capsule hook (63) can be inserted into the mounting holes.

6. The oil storage tank according to claim 3, characterized in that: It also includes a cabinet cover (18), which is arranged on an end surface of the cabinet body (11); A capsule limiting plate (192) is arranged on the side of the lower surface of the top plate close to the cabinet cover (18), and a first positioning hole is arranged on the capsule limiting plate (192); a bracket positioning plate (65) and a positioning rod are arranged on the end of the capsule bracket (6) close to the cabinet cover (18), and a second positioning hole is arranged on the bracket positioning plate (65), and the positioning rod can fix the capsule bracket (6) on the capsule limiting plate (192) after passing through the first positioning hole and the second positioning hole.

7. The oil storage tank according to claim 3, characterized in that: The oil storage cabinet (1) further comprises a pressure boosting component (4); The booster assembly (4) comprises: a booster pump (46), fixed to the outside of the first side plate, for delivering external air to the interior of the capsule; and, A first connecting pipe has one end connected to the booster pump (46) and the other end connected to the interior of the capsule.

8. The oil storage tank according to claim 7, characterized in that: The booster assembly (4) further comprises: an oil level sensor (47), fixed on a side wall of the cabinet (11), for detecting the oil level of the transformer oil in the cabinet (11) and outputting a first detection signal; and, A first controller is electrically connected to the oil level sensor (47) and the booster pump (46), respectively, and is used to receive a first detection signal from the oil level sensor (47), and control the start and stop of the booster pump (46) according to the first detection signal, so as to control the booster pump (46) to start when the oil level of the transformer oil in the cabinet (11) reaches a first oil level, and to control the booster pump (46) to stop when the oil level of the transformer oil in the cabinet (11) reaches a second oil level.

9. The oil storage tank according to claim 7, characterized in that: The booster assembly (4) further comprises: an oil temperature sensor, arranged inside the cabinet (11), for detecting the temperature of the transformer oil in the cabinet (11) and outputting a second detection signal; and, A second controller is electrically connected to the oil temperature sensor and the booster pump (46) respectively, and is used to receive a second detection signal from the oil temperature sensor and control the start and stop of the booster pump (46) according to the second detection signal, so as to control the booster pump (46) to start when the temperature of the transformer oil in the cabinet (11) reaches a first temperature, and to control the booster pump (46) to stop when the temperature of the transformer oil in the cabinet (11) reaches a second temperature.

10. The oil storage tank according to claim 7, characterized in that: The first connecting pipe is provided with a moisture absorbing device (44), the interior of which is filled with moisture absorbing material for drying the air flowing through it.

11. The oil storage tank according to claim 10, characterized in that: The first connecting pipe is also provided with a venting plug (421); The degassing plug (421) is arranged on the portion of the first connecting pipe between the moisture absorbing device (44) and the top plate, and is used to exhaust the capsule.

12. The oil storage tank according to any one of claims 1 to 11, characterized in that: Also includes a fuel tank pipeline (5); The oil tank pipeline (5) comprises: a second connecting pipe, arranged between the first bottom plate and the transformer body; one end of the second connecting pipe passes through the first bottom plate or the second bottom plate and is connected to the interior of the cabinet (11), and the other end of the second connecting pipe is connected to the top of the transformer body; and, A gas relay (54) is arranged on the second connecting pipe and is used to monitor the gas composition in the second connecting pipe.

13. The oil storage tank according to any one of claims 1 to 11, characterized in that: Also included is a filtration component; The filter assembly comprises: A second connecting pipe is arranged directly below the connection between the first bottom plate and the second bottom plate, and both ends of the second connecting pipe are connected to the interior of the cabinet (11); an oil pump, disposed on the second connecting pipe, for driving the transformer oil in the second connecting pipe to flow; and, The filter is arranged on the second connecting pipe and is used for filtering the transformer oil.

14. The oil storage tank according to any one of claims 1 to 11, characterized in that: Also includes an oil storage cabinet bracket (2); The oil conservator bracket (2) is fixed above the transformer body, and a V-shaped groove is formed on the top of the oil conservator bracket (2); the first bottom plate and the second bottom plate of the cabinet body (11) are fixed in the V-shaped groove.

15. An oil-immersed transformer, characterized in that: include: Transformer body; and, The oil conservator (1) according to any one of claims 1 to 14, wherein the oil conservator (1) is arranged above the transformer body.

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