Forced oil zigzag guide foil coil heat dissipation system

Abstract

The invention provides application of a strong oil zigzag guiding heat dissipation system in heat dissipation of a foil coil low-voltage winding of a transformer. The foil winding coil is provided with a foil winding structure formed by winding a conductive foil; the forced oil zigzag guide cooling system comprises an axial cooling oil duct group arranged between the conductive foil layers and a forced oil circulation guide cooling system; the axial cooling oil duct group consists of a plurality of axial long oil ducts which are arranged side by side; the single axial long oil ducts are arranged in a segmented and staggered mode in the axial direction, and the single segmented and staggered axial long oil ducts are formed. And the axial cooling oil duct group is communicated with an oil inlet pipeline and an oil outlet pipeline of the forced oil circulation guide cooling system. The axial oil ducts are additionally arranged in the foil coil, the oil ducts are arranged in a segmented and staggered mode, each oil duct is guaranteed to be smooth, dead oil ducts are avoided, the oil flow speed is reduced, and therefore the reliability and heat dissipation performance of overall operation are improved, and the service life of the coil is prolonged. The problems of heat dissipation of the foil coil and oil flow speed limitation under large current are solved.

Description

Technical Field

[0001] This invention belongs to the field of heat dissipation technology for low-voltage windings of foil-wound coils in transformers, and relates to the application of a strong oil zigzag-guided heat dissipation system in the heat dissipation of low-voltage windings of foil-wound coils in transformers, as well as a strong oil zigzag-guided foil-wound coil heat dissipation system, particularly a strong oil zigzag-guided foil-wound coil heat dissipation system. Background Technology

[0002] As transformer capacity (such as offshore wind power transformers) increases, the low-voltage winding current also increases to meet higher power transmission demands. The low-voltage winding of a transformer can be constructed using foil-wound coils. Foil-wound coils, also known as foil coils, are inductor devices made by winding high-conductivity foils such as copper or aluminum foil using a foil winding machine. They offer numerous advantages, including high mechanical strength, good electrical performance, ease of winding and processing, high production efficiency, compact and stable structure, high thermal conductivity, strong corrosion resistance, and effective resistance to electromagnetic interference and vibration.

[0003] However, when foil-wound coils are used in the low-voltage winding, as the low-voltage winding current increases, the surface heat dissipation area of ​​the foil-wound coil cannot meet the heat dissipation requirements caused by the increased losses, leading to a sharp rise in coil temperature, which affects the transformer's performance and lifespan. Even with forced oil circulation cooling, the cooled insulating oil cannot fully reach the innermost area of ​​the transformer body because the foil-wound coil is located there.

[0004] Therefore, finding a more suitable foil-wound coil heat dissipation system to solve the above-mentioned problems in the heat dissipation of the low-voltage winding of foil-wound coils in existing transformers has become one of the focuses of attention for many researchers in the industry. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide an application of a forced oil zigzag-guided heat dissipation system in the heat dissipation of the low-voltage winding of a foil-wound coil in a transformer, and a forced oil zigzag-guided foil-wound coil heat dissipation system. The foil-wound coil heat dissipation system provided by the present invention employs axial oil channels and a segmented staggered arrangement scheme to solve the heat dissipation problem faced by the foil-wound coil under high current conditions and the problem of limiting oil flow velocity. Moreover, this heat dissipation system has a simple structure, is easy to use, has good stability, and is highly operable, making it more suitable for promotion and application in industrial production.

[0006] This invention provides the application of a strong oil-driven zigzag heat dissipation system in the heat dissipation of the low-voltage winding of a transformer foil-wound coil;

[0007] The foil-wound coil has a foil-wound structure formed by winding conductive foil sheets;

[0008] The forced oil tortuous heat dissipation system includes an axial cooling oil channel group disposed between conductive foil layers and a forced oil circulation guided cooling system.

[0009] The axial cooling oil passage group consists of multiple long axial oil passages arranged side by side;

[0010] A single axially long oil passage is arranged in staggered segments along the axial direction to form a single staggered axially long oil passage;

[0011] The axial cooling oil passage assembly is connected to the inlet and outlet oil pipes of the forced oil circulation guided cooling system.

[0012] Preferably, the transformer includes an inner foil-wound low-voltage winding and an outer high-voltage winding;

[0013] The applications include reducing the cooling oil flow rate of the outer high-voltage winding;

[0014] The application also includes the use of preventing blockage of cooling oil channels in the low-voltage windings of foil-wound coils;

[0015] The low-voltage winding of the foil-wound coil is specifically a low-voltage winding of a high-current foil-wound coil.

[0016] The present invention also provides a foil-wound coil heat dissipation system with forced oil circulation, comprising: a foil-wound coil and a forced oil circulation guided cooling system associated with the foil-wound coil;

[0017] The foil-wound coil includes a foil-wound structure formed by winding conductive foil sheets and an axial cooling oil channel assembly disposed between the conductive foil sheet layers.

[0018] The axial cooling oil passage group consists of multiple long axial oil passages arranged side by side;

[0019] A single axially long oil passage is arranged in staggered segments along the axial direction to form a single staggered axially long oil passage;

[0020] The axial cooling oil passage assembly is connected to the inlet and outlet oil pipes of the forced oil circulation guided cooling system.

[0021] Preferably, the foil-wound coil includes one or more axial cooling oil passage groups;

[0022] The plurality of axial cooling oil passages are respectively arranged between different conductive foil layers;

[0023] The number of the plurality of axial cooling oil passage groups is 2 to 5.

[0024] Preferably, the axially elongated oil passage is a cooling oil passage in which the cooling oil is forced to flow in the axial direction;

[0025] The width of the axially elongated oil passage is 6–10 mm;

[0026] Specifically, the single axial long oil passage is segmented and staggered along the axial direction, meaning that along the axial direction, the single axial long oil passage is composed of multiple axial short oil passages, and adjacent axial short oil passages are staggered to allow the cooling oil to form staggered flow in the axial direction.

[0027] Adjacent single axially long oil passages and axially short oil passages in the same segment have the same and / or different axial lengths.

[0028] Preferably, the axial length of the axial short oil passage is 50-100 mm;

[0029] The number of the plurality of axial short oil passages is 5 to 15;

[0030] In the single axial long oil passage, there is a gap between adjacent axial short oil passages;

[0031] The interval between the axially short oil passages in a single axially long oil passage is connected to the interval between the axially short oil passages in adjacent axially long oil passages, forming transverse and / or oblique oil passages.

[0032] Preferably, the interval is 5-10 mm;

[0033] The axial cooling oil passage group has a grid-like distribution of oil passages;

[0034] The axial short oil passages are formed between adjacent conductive foil layers and supported by insulating struts;

[0035] The support height of the insulating support strip is 4-6 mm.

[0036] Preferably, the oil inlet end of the axial cooling oil channel assembly is located at the bottom of the foil winding coil and is connected to the cooling oil outlet pipe of the forced oil circulation guided cooling system;

[0037] The oil outlet of the axial cooling oil channel assembly is located at the top of the foil winding coil and is connected to the cooling oil inlet pipe of the forced oil circulation guided cooling system.

[0038] The outlet temperature of the cooling oil after cooling by the forced oil circulation cooling system is 40-50℃.

[0039] Preferably, the foil-wound coil heat dissipation system further includes an oil guide box disposed below the foil-wound coil;

[0040] The oil inlet of the axial cooling oil passage assembly is connected to the cooling oil outlet pipeline of the forced oil circulation cooling system via an oil guide box.

[0041] The oil guide box is specifically a multi-chamber oil guide box with internal flow guide baffles.

[0042] Preferably, the different chambers of the multi-chamber oil guide box are respectively connected to different oil passages of the axial cooling oil passage group;

[0043] The connection is specifically achieved through honeycomb-shaped through holes;

[0044] In the axial cooling oil passage assembly, the oil flow velocity of the cooling oil is 0.2 to 0.5 m / s;

[0045] The foil-wound coil heat dissipation system is a foil-wound coil heat dissipation system used for the low-voltage windings of large-capacity transformers.

[0046] This invention provides the application of a forced oil zigzag guided cooling system in the heat dissipation of the low-voltage winding of a foil-wound coil in a transformer. The foil-wound coil has a foil structure formed by winding conductive foil sheets. The forced oil zigzag guided cooling system includes an axial cooling oil channel group disposed between the conductive foil sheet layers and a forced oil circulation guided cooling system. The axial cooling oil channel group consists of multiple parallel axial long oil channels. Each axial long oil channel is segmented and staggered along the axial direction to form a single segmented staggered axial long oil channel. The axial cooling oil channel group is connected to the inlet and outlet oil pipes of the forced oil circulation guided cooling system. Compared with the prior art, this invention suggests that as the low-voltage winding current increases, the surface heat dissipation area of ​​the foil-wound coil cannot meet the heat dissipation requirements caused by increased losses. Although a forced oil circulation cooling method is adopted, the insulating oil after cooling cannot fully reach this area because the foil-wound coil is located at the innermost part of the transformer body. Moreover, the oil flow through the foil-wound coil is insufficient, resulting in a high temperature of the foil-wound coil, while the flow through the external coil is excessive, resulting in a high oil flow velocity, which can easily lead to oil flow electrification and damage the transformer insulation. However, if the oil circulation cooling capacity is further increased, it will make the external coil more prone to oil flow electrification.

[0047] Based on this, the present invention specifically designs a strong oil-guided heat dissipation device with a specific structure for heat dissipation of the low-voltage winding of the foil-wound coil in a transformer. The present invention adds axial oil channels inside the foil-wound coil, and the oil channels adopt a segmented staggered arrangement to ensure that each oil channel is unobstructed. This avoids the formation of dead oil channels and reduces the oil flow velocity, thereby improving the overall operational reliability and heat dissipation performance.

[0048] In this invention, the insulating oil, after being cooled by the cooler, is pumped from the oil pipe into the oil box and then into the interior of the transformer body through the insulating pad at the bottom. Under the action of its own guiding structure, the insulating oil rises along a predetermined tortuous guiding path, concentrating on cooling the high-temperature area and avoiding local overheating, thus achieving the effect of cooling the transformer body.

[0049] The oil-guided foil winding structure provided in this application can solve the heat dissipation problem faced by foil-wound coils under high current conditions and the problem of limiting oil flow velocity. Moreover, this heat dissipation system has a simple structure, is easy to use, has good stability, and is highly operable, making it more suitable for promotion and application in industrial production. Attached Figure Description

[0050] Figure 1 A simplified structural diagram of the axial cooling oil passage assembly of the forced oil tortuous guide heat dissipation system provided by the present invention;

[0051] Figure 2 A simplified schematic diagram of the structure of the forced oil-guided cooling system for the low-voltage winding of the transformer provided by the present invention. Detailed Implementation

[0052] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims.

[0053] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0054] The purity of all raw materials used in this invention is not particularly limited. However, this invention preferably uses industrial-grade pure materials or materials with conventional purity used in the preparation of foil-wound coil heat dissipation devices for transformers.

[0055] All process apparatuses of this invention are referred to by their conventional names and abbreviations. Each name and abbreviation is clear and distinct within its relevant application. Based on the name, abbreviation, and corresponding application, those skilled in the art can purchase them from commercially available sources or prepare them by conventional methods.

[0056] This invention provides the application of a strong oil-driven zigzag heat dissipation system in the heat dissipation of the low-voltage winding of a transformer foil-wound coil;

[0057] The foil-wound coil has a foil-wound structure formed by winding conductive foil sheets;

[0058] The forced oil tortuous heat dissipation system includes an axial cooling oil channel group disposed between conductive foil layers and a forced oil circulation guided cooling system.

[0059] The axial cooling oil passage group consists of multiple long axial oil passages arranged side by side;

[0060] A single axially long oil passage is arranged in staggered segments along the axial direction to form a single staggered axially long oil passage;

[0061] The axial cooling oil passage assembly is connected to the inlet and outlet oil pipes of the forced oil circulation guided cooling system.

[0062] In this invention, the transformer preferably includes an inner foil-wound low-voltage winding and an outer high-voltage winding.

[0063] In this invention, the forced oil circulation guided cooling system connects both the low-voltage winding and the high-voltage winding for transformer heat dissipation. The connection method is typically parallel.

[0064] In this invention, the application preferably includes the application of reducing the cooling oil flow rate of the outer high-voltage winding.

[0065] In this invention, the application also preferably includes the application in preventing blockage of the cooling oil channels of the low-voltage winding of the foil-wound coil.

[0066] In this invention, the low-voltage winding of the foil-wound coil is preferably a high-current foil-wound coil low-voltage winding. Specifically, the high-current value is preferably ≥4000A, more preferably ≥5000A, more preferably ≥6000A, and can be 4000~10000A, or 5000~9000A, or 6000~8000A.

[0067] In this invention, the forced oil circulation guided cooling system further includes a cooling oil delivery pump, wherein the pump pressure of the cooling oil delivery pump is 0.1 to 0.3 MPa, more preferably 0.12 to 0.28 MPa, more preferably 0.15 to 0.25 MPa, and even more preferably 0.18 to 0.26 MPa.

[0068] The present invention provides a foil-wound coil heat dissipation system with forced oil circulation, comprising: a foil-wound coil and a forced oil circulation guided cooling system associated with the foil-wound coil;

[0069] The foil-wound coil includes a foil-wound structure formed by winding conductive foil sheets and an axial cooling oil channel assembly disposed between the conductive foil sheet layers.

[0070] The axial cooling oil passage group consists of multiple long axial oil passages arranged side by side;

[0071] A single axially long oil passage is arranged in staggered segments along the axial direction to form a single staggered axially long oil passage;

[0072] The axial cooling oil passage assembly is connected to the inlet and outlet oil pipes of the forced oil circulation guided cooling system.

[0073] In this invention, the foil-wound coil preferably includes one or more axial cooling oil passages.

[0074] In this invention, the plurality of axial cooling oil passage groups are preferably respectively arranged between different conductive foil layers.

[0075] In this invention, the number of the plurality of axial cooling oil passage groups is preferably 2 to 5, more preferably 2, 3, 4 or 5.

[0076] In this invention, the axially elongated oil passage is preferably a cooling oil passage in which the direction of forced flow of cooling oil is axial.

[0077] In this invention, the width of the axially elongated oil passage is preferably 6-10 mm, more preferably 6.5-9.5 mm, more preferably 7-9 mm, and even more preferably 7.5-8.5 mm.

[0078] In this invention, the segmented and staggered arrangement of the single axially long oil passage is preferably composed of multiple axially short oil passages along the axial direction. Adjacent axially long oil passages of the single axially long oil passage are staggered to allow the cooling oil to flow in an alternating manner along the axial direction. Specifically, adjacent single axially long oil passages can be a first axially long oil passage and a second axially long oil passage. The first and second segments of the first axially long oil passage are staggered. Thus, a portion of the cooling oil flowing out of the first segment of the first axially long oil passage enters the second segment of the first axially long oil passage, and the other portion enters the second segment of the second axially long oil passage, and so on.

[0079] In this invention, the axial lengths of adjacent single axially long oil passages and axially short oil passages in the same segment are preferably the same and / or different, more preferably the same or different.

[0080] In this invention, "same segment" refers to a single axially long oil passage that can be divided into a first axially short oil passage, a second axially short oil passage, and so on up to the nth axially short oil passage. In adjacent axially long oil passages, i.e., the first axially long oil passage and the second axially long oil passage, the lengths of the first axially short oil passages can be the same or different, to satisfy the staggered setting as a reference.

[0081] In this invention, the axial length of the axial short oil passage is preferably 50-100 mm, more preferably 60-90 mm, and even more preferably 70-80 mm.

[0082] In this invention, the number of the plurality of axial short oil passages is preferably 5 to 15, more preferably 7 to 13, and even more preferably 9 to 11.

[0083] In this invention, in the single axially long oil passage, there is preferably a gap between adjacent axially short oil passages.

[0084] In this invention, the interval between the axial short oil passages in a single axial long oil passage is connected to the interval between the axial short oil passages in adjacent axial long oil passages, preferably forming transverse and / or oblique oil passages, more preferably forming transverse or oblique oil passages.

[0085] In this invention, the distance of the interval is preferably 5 to 10 mm, more preferably 6 to 9 mm, and even more preferably 7 to 8 mm.

[0086] In this invention, the axial cooling oil passage group preferably has a grid-like distribution of oil passages.

[0087] In this invention, the axial short oil channel is preferably formed between adjacent conductive foil layers by an insulating support bar.

[0088] In this invention, the support height of the insulating support strip is preferably 4-6 mm, more preferably 4.4-5.6 mm, and even more preferably 4.8-5.2 mm.

[0089] In this invention, the oil inlet end of the axial cooling oil channel assembly is located at the bottom of the foil winding coil, and is preferably connected to the cooling oil outlet pipeline of the forced oil circulation guided cooling system.

[0090] In this invention, the oil outlet of the axial cooling oil channel assembly is located at the top of the foil-wound coil, and is preferably connected to the cooling oil inlet pipe of the forced oil circulation guided cooling system.

[0091] In this invention, the outlet temperature of the cooling oil after cooling by the forced oil circulation guided cooling system is preferably 40-50°C, more preferably 42-48°C, and even more preferably 44-46°C.

[0092] In this invention, the foil-wound coil heat dissipation system preferably includes an oil guide box disposed below the foil-wound coil.

[0093] In this invention, the oil inlet of the axial cooling oil passage assembly is preferably connected to the cooling oil outlet pipeline of the forced oil circulation guided cooling system via an oil guide box.

[0094] In this invention, the oil guide box is preferably a multi-chamber oil guide box with internal flow guide baffles.

[0095] In this invention, the different chambers of the multi-chamber oil guide box are preferably connected to different oil passages of the axial cooling oil passage group.

[0096] In this invention, the connection is preferably made through honeycomb-shaped through holes.

[0097] In this invention, the flow velocity of the cooling oil in the axial cooling oil passage assembly is preferably less than or equal to 0.5 m / s, more preferably 0.2 to 0.5 m / s, more preferably 0.25 to 0.45 m / s, and even more preferably 0.3 to 0.4 m / s.

[0098] In this invention, the foil-wound coil heat dissipation system is specifically a foil-wound coil heat dissipation system for the low-voltage winding of a large-capacity transformer.

[0099] To complete and refine the overall technical solution, better ensure the structure of the foil-wound coil heat dissipation system, and further improve the heat dissipation performance of the foil-wound coil heat dissipation system, the application of the above-mentioned strong oil zigzag guiding heat dissipation system in the heat dissipation of the low-voltage winding of the foil-wound coil of the transformer, and a strong oil zigzag guiding foil-wound coil heat dissipation system, specifically may include the following:

[0100] This invention provides a foil winding structure employing strong oil guidance:

[0101] Insulating oil, cooled to 40-50°C by an external cooler (usually a plate or tube-fin heat exchanger), is driven by an oil pump and enters the oil guide box through an oil guide pipe. The oil guide box adopts a chambered design (with internal flow guide baffles) to evenly distribute the oil flow to the bottom of the transformer body, and then permeates into the transformer body through the honeycomb-shaped through-holes on the insulating pad. Utilizing the guide grooves of the coil frame and the oil guide baffles of the iron core clamps, the oil flow is forced to rise along a preset path, directly flushing the high-temperature area and reducing "ineffective circulation." Centralized cooling capacity can reduce hot spot temperature fluctuations and extend the life of the insulation material.

[0102] Insulating support strips are embedded between each copper foil segment of the foil-wound coil to form axial oil channels with a height of 4-6 mm. Each axial oil channel is divided into multiple segments, with a 5-10 mm interval between segments forming a parallel network. This avoids blockages in single paths that could lead to "dead oil channels." The staggered arrangement ensures uniform oil distribution within the winding and prevents localized overheating. A shunt design controls the oil flow velocity to below 0.5 m / s to prevent the oil from becoming charged.

[0103] See Figure 1 , Figure 1 A simplified structural diagram of the axial cooling oil channel assembly of the forced oil tortuous guiding heat dissipation system provided by the present invention. Wherein, 1-foil-wound coil; 2-segmented axial oil channel.

[0104] See Figure 2 , Figure 2 This is a simplified structural diagram of the forced oil-guided cooling system for the low-voltage winding of a transformer provided by the present invention. In the diagram, 3 is the oil guide pipe; 4 is the oil guide box; and 5 is the insulating pad.

[0105] The present invention provides the application of a forced oil tortuous guiding heat dissipation system in the heat dissipation of the low-voltage winding of a transformer foil-wound coil, and a forced oil tortuous guiding foil-wound coil heat dissipation system. The present invention features a specially designed forced oil tortuous guiding heat dissipation device with a specific structure for heat dissipation of the low-voltage winding of a transformer foil-wound coil. The present invention adds axial oil channels inside the foil-wound coil, and the oil channels adopt a segmented staggered arrangement to ensure that each oil channel is unobstructed, thus avoiding the formation of dead oil channels and reducing the oil flow velocity, thereby improving the overall operational reliability and heat dissipation performance.

[0106] In this invention, the insulating oil, after being cooled by the cooler, is pumped from the oil pipe into the oil box and then into the interior of the transformer body through the insulating pad at the bottom. Under the action of its own guiding structure, the insulating oil rises along a predetermined tortuous guiding path, concentrating on cooling the high-temperature area and avoiding local overheating, thus achieving the effect of cooling the transformer body.

[0107] The oil-guided foil winding structure provided in this application can solve the heat dissipation problem faced by foil-wound coils under high current conditions and the problem of limiting oil flow velocity. Moreover, this heat dissipation system has a simple structure, is easy to use, has good stability, and is highly operable, making it more suitable for promotion and application in industrial production.

[0108] To further illustrate the present invention, the following describes in detail, with reference to embodiments, the application of the strong oil zigzag guiding heat dissipation system provided by the present invention in the heat dissipation of the low-voltage winding of the foil-wound coil of the transformer, and a strong oil zigzag guiding foil-wound coil heat dissipation system. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, only to further illustrate the features and advantages of the present invention, and not to limit the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0109] Example 1

[0110] like Figure 1 and 2 As shown, the heat dissipation experiment of the low-voltage winding of the 8000A high-current foil-wound coil was carried out using the strong oil zigzag guiding heat dissipation system provided by the present invention.

[0111] The insulating oil, cooled by the external cooler, is driven by the oil pump at 0.2MPa and enters the oil guide box 4 through the oil guide pipe 3. The oil guide box 4 evenly distributes the oil flow to the bottom of the transformer body and penetrates into the foil winding coil 1 through the insulating pad 5. The insulating oil flows through the foil winding coil 1 along the path of the segmented axial oil channel 2, flows out from the top of the foil winding coil 1, and re-enters the external cooler through the pipeline at the top of the oil tank.

[0112] The transformer foil-wound coil heat dissipation system, which employs a strong oil-driven zigzag guide, achieves an average temperature rise of 50K for the coil and a hot spot temperature rise of 54K. This significantly reduces the hot spot temperature rise, and the temperature rise index is better than the standard value, thereby improving product lifespan and operational reliability.

[0113] Compared to the previous oil circuit, which had a conventional long oil channel spacing arrangement, the average temperature rise of the transformer foil winding coil was 52K and the hot spot temperature rise was 60K under the same pump pressure.

[0114] To achieve the same heat dissipation effect as in this embodiment, the oil pump pressure needs to be increased, but this will cause the oil flow velocity in the winding cooling oil circuit to exceed 0.5m / s, resulting in the oil flow becoming electrified.

[0115] The above provides a detailed description of the application of the strong oil zigzag-guided heat dissipation system in the heat dissipation of the low-voltage winding of the foil-wound coil in a transformer, as well as a strong oil zigzag-guided foil-wound coil heat dissipation system. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the embodiments above are merely to help understand the method and core ideas of the invention, including the best mode, and to enable any person skilled in the art to practice the invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those skilled in the art, several improvements and modifications can be made to the invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements that are not different from the textual description of the claims, or if they include equivalent structural elements that are not substantially different from the textual description of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. The application of strong oil meandering guiding heat dissipation system in the heat dissipation of foil winding coil low voltage winding of transformer; The foil winding coil has a foil winding structure formed by winding of conductive foil sheets; The strong oil meandering guiding heat dissipation system comprises an axial cooling oil channel group arranged between the conductive foil sheet layers and a forced oil circulation guiding cooling system; The axial cooling oil channel group is composed of a plurality of axially long oil channels arranged side by side; The single axially long oil channel is arranged in an axial segmented staggered manner to form a single segmented staggered axially long oil channel; The axial cooling oil channel group is connected with the oil inlet pipeline and the oil outlet pipeline of the forced oil circulation guiding cooling system.

2. Use according to claim 1, characterized in that, The transformer comprises an inner foil winding coil low voltage winding and an outer high voltage winding; The application comprises the application in reducing the cooling oil flow of the outer high voltage winding; The application also comprises the application in avoiding the blockage of the cooling oil channel of the foil winding coil low voltage winding; The foil winding coil low voltage winding is specifically a large current foil winding coil low voltage winding.

3. A foil-wound coil heat dissipation system with strong oil meandering guide, characterized in that, Comprise: A foil winding coil and a forced oil circulation guiding cooling system associated with the foil winding coil; The foil winding coil comprises a foil winding structure formed by winding of conductive foil sheets and an axial cooling oil channel group arranged between the conductive foil sheet layers; The axial cooling oil channel group is composed of a plurality of axially long oil channels arranged side by side; The single axially long oil channel is arranged in an axial segmented staggered manner to form a single segmented staggered axially long oil channel; The axial cooling oil channel group is connected with the oil inlet pipeline and the oil outlet pipeline of the forced oil circulation guiding cooling system.

4. The foil-wound coil heat dissipation system of claim 3, wherein, The foil winding coil comprises one or more axial cooling oil channel groups; The plurality of axial cooling oil channel groups are respectively arranged between different conductive foil sheet layers; The number of the plurality of axial cooling oil channel groups is 2-5.

5. The foil-wound coil heat dissipation system of claim 3, wherein, The axially long oil channel is specifically a cooling oil forced flow direction axial cooling oil channel; The width of the axially long oil channel is 6-10 mm; The single axially long oil channel arranged in an axial segmented staggered manner is specifically that, along the axial direction, the single axially long oil channel is composed of a plurality of axially short oil channels, and adjacent axially short oil channels are arranged in a staggered manner to form staggered flow of the cooling oil in the axial direction; Adjacent single axially long oil channels have the same and / or different axial lengths of the same segment axially short oil channel.

6. The foil-wound coil heat sink system of claim 5, wherein, The axial length of the axially short oil channel is 50-100 mm; The number of the plurality of axially short oil channels is 5-15; In the single axially long oil channel, adjacent axially short oil channels have a spacing; The spacing between the axially short oil channels in the single axially long oil channel is connected with the spacing between the axially short oil channels in the adjacent axially long oil channel to form a transverse and / or oblique oil channel.

7. The foil-wound coil heat sink system of claim 6, wherein, The distance of the spacing is 5-10 mm; The axial cooling oil channel group has a grid-shaped distribution of oil paths; The axially short oil channel is supported by an insulating support strip between adjacent conductive foil sheet layers; The support height of the insulating support strip is 4-6 mm.

8. The foil-wound coil heat sink system of claim 3, wherein, The oil inlet end of the axial cooling oil channel group is located at the bottom of the foil winding coil and is connected with the cooling oil outlet pipeline of the forced oil circulation guiding cooling system; The oil outlet end of the axial cooling oil channel group is located at the top of the foil winding coil and is connected with the cooling oil inlet pipeline of the forced oil circulation guiding cooling system; The cooling oil after being cooled by the forced oil circulation guide cooling system has an outlet temperature of 40-50 DEG C.

9. The foil-wound coil heat sink system of claim 8, wherein, The foil-wound coil heat dissipation system further comprises an oil guide box arranged below the foil-wound coil. An oil inlet end of the axial cooling oil channel group is connected to an oil outlet pipeline of the forced oil circulation guide cooling system through the oil guide box. The oil guide box is a multi-chamber oil guide box with a flow guide partition plate arranged inside.

10. The foil-wound coil heat dissipation system of claim 9, wherein, Different chambers of the multi-chamber oil guide box are connected to different oil channels of the axial cooling oil channel group. The connection is specifically a connection through honeycomb-shaped through holes. In the axial cooling oil channel group, the oil flow speed of the cooling oil is 0.2-0.5 m / s. The foil-wound coil heat dissipation system is a foil-wound coil heat dissipation system for low-voltage windings of large-capacity transformers.

Images