Power transformer winding and power transformer

Abstract

The utility model provides power transformer winding and power transformer. Power transformer winding includes: coil cylinder body, is formed by coil cake, forms radial cooling oil channel between adjacent coil cake, inner cylinder body is formed with the inner layer cooling oil channel between coil cylinder body, and outer cylinder body is formed with the outer layer cooling oil channel between coil cylinder body, power transformer winding still includes: a plurality of support strip, is fixed to the inner circumferential surface and outer circumferential surface of coil cylinder body, and support strip has support strip connecting portion, and oil baffle ring is arranged in the inner layer cooling oil channel and / or outer layer cooling oil channel, and oil baffle ring makes the cooling oil flowing in the inner layer cooling oil channel and / or outer layer cooling oil channel change direction and flow to radial cooling oil channel, and oil baffle ring has oil baffle ring connecting portion, and oil baffle ring and support strip are fixedly connected together through the connection between oil baffle ring connecting portion and support strip connecting portion. The oil baffle ring of power transformer winding is convenient to install and improves the effect of partial oil flow resistance of winding.

Description

Technical Field

[0001] This application relates to the field of power transformer manufacturing technology. Specifically, this application relates to power transformer windings and power transformers. Background Technology

[0002] The cooling oil flow distribution of traditional power transformers is based on the equivalent distribution of oil flow resistance inside the transformer windings. If an oil baffle structure is added to a local area of ​​the transformer windings, the direction of oil flow can be changed in the local area of ​​the windings, and the oil flow velocity can be increased in the local area of ​​the windings to improve the local hot spot temperature of the windings. However, the current oil baffle structure is usually a thin paper structure, which has many problems in application.

[0003] First, local slots need to be made in the insulating pads between the coil discs of the transformer windings to accommodate a special oil-blocking structure, which is a challenging process. It should be noted that the coil discs can also be called coil reels.

[0004] Secondly, the existing oil baffle structure is an oil baffle plate, which is usually made of 1mm thick bent cardboard and placed in the inner and outer cooling oil channels of the winding. The oil baffle plate structure is relatively thin and is prone to bending and damage during installation. When the oil flow is large or the placement is not ideal, the oil flow sealing effect is poor. Utility Model Content

[0005] This application aims to provide a power transformer winding and a power transformer that facilitates the installation of an oil-blocking structure and improves the effect of localized oil flow obstruction in the winding.

[0006] According to one aspect of this application, a power transformer winding is provided, comprising: a coil cylinder composed of a plurality of coil discs arranged in an axial direction, wherein a radial cooling oil channel is formed between two adjacent coil discs, the coil cylinder having a first end and a second end opposite to the first end in the axial direction; an inner cylinder disposed on the inner side of the inner circumferential surface of the coil cylinder, the space between the outer circumferential surface of the inner cylinder and the inner circumferential surface of the coil cylinder forming an inner layer cooling oil channel; and an outer cylinder disposed on the outer side of the outer circumferential surface of the coil cylinder, the space between the inner circumferential surface of the outer cylinder and the outer circumferential surface of the coil cylinder forming an outer layer cooling oil channel. Specifically, the power transformer winding has a cooling oil flow path, the cooling oil flow path including: a cooling oil inlet located at the first end of the coil cylinder, a cooling oil outlet located at the second end of the coil cylinder, and a radial cooling oil channel formed by the radial cooling oil channel. The cooling oil passage, the inner cooling oil passage, and the outer cooling oil passage together form a cooling oil channel, through which cooling oil flows in from the cooling oil inlet, passes through the cooling oil passage, and flows out from the cooling oil outlet to cool the coil body. The power transformer winding also includes: a plurality of support bars extending along the axial direction and fixed to the inner and outer circumferential surfaces of the coil body, the support bars having support bar connecting portions; and an oil baffle ring disposed in the inner cooling oil passage and / or the outer cooling oil passage, the oil baffle ring extending along the circumferential direction of the coil body, the oil baffle ring causing the cooling oil flowing in the inner cooling oil passage and / or the outer cooling oil passage to flow toward the radial cooling oil passage, the oil baffle ring having an oil baffle ring connecting portion; the oil baffle ring and the plurality of support bars are fixedly connected together by a connection between the oil baffle ring connecting portion and the support bar connecting portion.

[0007] In this way, the power transformer winding of this utility model utilizes the connection between the support bar connecting part and the oil baffle ring connecting part to facilitate the installation of the oil baffle ring, while improving the effect of local blocking of oil flow in the winding.

[0008] According to an exemplary embodiment of this application, the plurality of support bars include: a plurality of inner support bars, the outer surfaces of which are fixed to the inner circumferential surface of the coil cylinder, and the inner surfaces of which contact the inner cylinder; and a plurality of outer support bars, the inner surfaces of which are fixed to the outer circumferential surface of the coil cylinder, and the outer surfaces of which contact the outer cylinder. The oil baffle ring includes: one or more inner oil baffle rings extending circumferentially at the inner circumferential surface of the coil cylinder for guiding cooling oil from the inner cooling oil channel to the radial cooling oil channel; and one or more outer oil baffle rings extending circumferentially at the outer circumferential surface of the coil cylinder for guiding cooling oil from the outer cooling oil channel to the radial cooling oil channel. The support bar connecting portion includes: The device includes multiple inner support bar connecting portions and multiple outer support bar connecting portions; the oil baffle ring connecting portion includes multiple inner oil baffle ring connecting portions and multiple outer oil baffle ring connecting portions; the inner oil baffle ring is provided with multiple inner oil baffle ring connecting portions, and the multiple inner support bars are provided with multiple inner support bar connecting portions for connecting with the multiple inner oil baffle ring connecting portions, thereby fixing the inner oil baffle ring to the multiple inner support bars; and the outer oil baffle ring is provided with multiple outer oil baffle ring connecting portions, and the multiple outer support bars are provided with multiple outer support bar connecting portions for connecting with the multiple outer oil baffle ring connecting portions, thereby fixing the outer oil baffle ring to the multiple outer support bars.

[0009] In this way, the power transformer winding of this invention effectively guides the cooling oil from the inner and outer cooling oil channels to the radial cooling oil channels, significantly improving the effect of localized oil flow obstruction in the winding.

[0010] According to an exemplary embodiment of this application, the plurality of inner oil baffle ring connecting portions include a plurality of inner oil baffle ring grooves formed on the inner oil baffle rings, and the plurality of inner support strip connecting portions include a plurality of inner support strip grooves formed on the plurality of inner support strips, the positions and shapes of the plurality of inner oil baffle ring grooves being adapted to the positions and shapes of the plurality of inner support strip grooves for overlapping and fixing together; and the plurality of outer oil baffle ring connecting portions include a plurality of outer oil baffle ring grooves formed on the outer oil baffle rings, and the plurality of outer support strip connecting portions include a plurality of outer support strip grooves formed on the plurality of outer support strips, the positions and shapes of the plurality of outer oil baffle ring grooves being adapted to the positions and shapes of the plurality of outer support strip grooves for overlapping and fixing together.

[0011] In this way, by using the snap-fit ​​connection between the inner oil baffle ring groove and the inner support strip groove, as well as the snap-fit ​​connection between the outer oil baffle ring groove and the outer support strip groove, the assembly process of the inner and outer oil baffle rings is significantly simplified, while the overlapping structure of the grooves enhances the reliability of the mechanical connection.

[0012] According to an exemplary embodiment of this application, a plurality of inner oil baffle ring grooves are formed on the inner surface of the inner oil baffle ring opposite to the coil cylinder, and a plurality of inner support strip grooves are formed on the outer surface of the plurality of inner support strips facing the coil cylinder; and a plurality of outer oil baffle ring grooves are formed on the outer surface of the outer oil baffle ring opposite to the coil cylinder, and a plurality of outer support strip grooves are formed on the inner surface of the plurality of outer support strips facing the coil cylinder.

[0013] In this way, by utilizing the specific positions of the inner oil baffle ring groove and the inner support strip groove, as well as the specific positions of the outer oil baffle ring groove and the outer support strip groove, the inner support strip is located inside the inner oil baffle ring at the connection position between the inner support strip and the inner oil baffle ring, making the fixation of the inner oil baffle ring more reliable. Similarly, the outer support strip is located outside the outer oil baffle ring at the connection position between the outer support strip and the outer oil baffle ring, making the fixation of the outer oil baffle ring more reliable.

[0014] According to an exemplary embodiment of this application, the thickness of the inner oil baffle ring in the radial direction is the same as the thickness of the inner support strip in the radial direction; the groove of the inner oil baffle ring extends through the inner oil baffle ring in the axial direction, and the depth of the groove in the radial direction is half the thickness of the inner oil baffle ring in the radial direction; the groove of the inner support strip extends through the inner support strip in the circumferential direction, and the depth of the groove in the radial direction is half the thickness of the inner support strip in the radial direction; the groove of the inner oil baffle ring and the groove of the inner support strip overlap each other, such that the inner surface of the inner oil baffle ring and the inner surface of the inner support strip are aligned with each other, the outer surface of the inner oil baffle ring and the outer surface of the inner support strip are aligned with each other, and the inner surface of the inner oil baffle ring contacts the outer circumferential surface of the inner cylinder;

[0015] Furthermore, the thickness of the outer oil baffle ring in the radial direction is the same as the thickness of the outer support strip in the radial direction; the groove of the outer oil baffle ring extends through the outer oil baffle ring in the axial direction, and the depth of the groove in the radial direction is half the thickness of the outer oil baffle ring in the radial direction; the groove of the outer support strip extends through the outer support strip in the circumferential direction, and the depth of the groove in the radial direction is half the thickness of the outer support strip in the radial direction; the groove of the outer oil baffle ring and the groove of the outer support strip overlap each other, so that the inner surface of the outer oil baffle ring and the inner surface of the outer support strip are aligned with each other, the outer surface of the outer oil baffle ring and the outer surface of the outer support strip are aligned with each other, and the outer surface of the outer oil baffle ring contacts the inner circumferential surface of the outer cylinder.

[0016] In this way, the inner surface of the inner oil baffle ring contacts the outer circumferential surface of the inner cylinder to form a closed flow path of the cooling oil in the inner cooling oil channel, and the outer surface of the outer oil baffle ring contacts the inner circumferential surface of the outer cylinder to form a closed flow path of the cooling oil in the outer cooling oil channel. This achieves a better oil flow sealing effect in a localized manner.

[0017] According to an exemplary embodiment of this application, the width of the inner oil baffle in the axial direction is the same as the width of one of the coil cakes in the axial direction, and the width of the outer oil baffle in the axial direction is the same as the width of one of the coil cakes in the axial direction; and the position of the inner oil baffle in the axial direction is aligned with the position of one of the coil cakes in the axial direction, and the position of the outer oil baffle in the axial direction is aligned with the position of the other coil cake in the axial direction.

[0018] In this way, the width of the inner and outer oil baffles achieves a better oil flow sealing effect. If the width of the inner and outer oil baffles is too thin, the oil flow sealing effect will be poor. If the width of the inner and outer oil baffles is too thick, it will cause blockage of some radial cooling oil passages.

[0019] According to an exemplary embodiment of this application, the inner oil baffle ring and the outer oil baffle ring are arranged at different positions along the axial direction.

[0020] In this way, the inner and outer oil baffle rings expand the distribution range of the oil flow and enhance the overall heat dissipation capacity.

[0021] According to an exemplary embodiment of this application, the inner oil baffle ring includes a first inner oil baffle ring and a second inner oil baffle ring, the first inner oil baffle ring being located at the first end of the coil cylinder, the second inner oil baffle ring being located at the middle position of the coil cylinder in the axial direction, and the outer oil baffle ring includes a first outer oil baffle ring and a second outer oil baffle ring, the first outer oil baffle ring being located at the middle position between the first inner oil baffle ring and the second inner oil baffle ring, and the second outer oil baffle ring being located at the middle position between the second inner oil baffle ring and the second end of the coil cylinder.

[0022] In this way, the positional arrangement of the inner and outer oil baffles optimizes the axial distribution of oil flow, which helps with heat dissipation.

[0023] According to an exemplary embodiment of this application, the inner oil baffle ring is a 360-degree ring composed of multiple interconnected segments, and the outer oil baffle ring is a 360-degree ring composed of multiple interconnected segments.

[0024] In this way, the multi-section connection design improves the flexibility of transporting and assembling the various components of the power transformer winding, while maintaining the integrity of the oil baffle ring and better oil flow sealing effect.

[0025] According to another aspect of the present invention, a power transformer is provided, the power transformer including the power transformer windings according to any of the above embodiments.

[0026] In summary, the power transformer winding and power transformer of this utility model achieve many beneficial technical effects. For example, firstly, the placement of the oil baffle ring can be determined based on the design, providing more optimization possibilities; secondly, the snap-fit ​​connection between the support bar connecting part and the oil baffle ring connecting part facilitates the installation of the oil baffle ring; and thirdly, the oil baffle ring significantly improves the effect of locally blocking oil flow in the winding. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a schematic perspective view of a power transformer winding according to an exemplary embodiment of this application.

[0029] Figure 2 This is a schematic perspective view of a power transformer winding according to an exemplary embodiment of this application, compared to Figure 1 In this regard, the inner cylinder and the outer inner cylinder are omitted.

[0030] Figure 3 This is a schematic perspective view of a quarter section of a power transformer winding according to an exemplary embodiment of this application.

[0031] Figure 4 This is a schematic perspective view of a quarter section of a power transformer winding according to an exemplary embodiment of this application, compared to Figure 3 In this regard, the inner cylinder has been omitted.

[0032] Figure 5 yes Figure 4 The diagram shows a partially enlarged perspective view of a quarter section of a power transformer winding, omitting the inner cylinder and inner support bars.

[0033] Figure 6 This is a schematic perspective view of a quarter section of a power transformer winding according to an exemplary embodiment of this application, showing the relationship with... Figure 3 Different angles.

[0034] Figure 7 This is a schematic perspective view of a quarter section of a power transformer winding according to an exemplary embodiment of this application, compared to Figure 6 In this regard, the outer cylinder has been omitted.

[0035] Figure 8 yes Figure 7 The diagram shows a partially enlarged perspective view of a quarter section of the power transformer winding, omitting the outer cylinder and outer support bars.

[0036] Figure 9 This is a schematic perspective view of the outer oil retaining ring of a power transformer winding according to an exemplary embodiment of this application.

[0037] Figure 10 This is a schematic perspective view of the inner oil retaining ring of a power transformer winding according to an exemplary embodiment of this application.

[0038] Figure 11 This is a schematic perspective view of an inner oil baffle ring and inner support bar of a power transformer winding assembled together according to an exemplary embodiment of this application.

[0039] Figure 12 This is a schematic perspective view of a power transformer winding with its outer oil retaining ring and outer support bar assembled together, according to an exemplary embodiment of this application.

[0040] Figure 13 This is a schematic perspective view of the inner support bar of a power transformer winding according to an exemplary embodiment of this application.

[0041] Figure 14This is a schematic perspective view of the outer support bar of a power transformer winding according to an exemplary embodiment of this application.

[0042] The accompanying figure is labeled as follows:

[0043] 100. Coil cylinder

[0044] 110. Coil cake

[0045] 120. Radial cooling oil passage

[0046] 300, Inner Support Strip

[0047] 310. Connecting part of inner support bar

[0048] 320. Inner support strip groove

[0049] 400, External support strip

[0050] 410. External support strip connection part

[0051] 420. Outer support strip groove

[0052] 500, inner cylinder

[0053] 600. Outer cylinder

[0054] 700, Inner Oil Ring

[0055] 710. Inner oil baffle ring connection part

[0056] 720. Inner oil baffle ring groove

[0057] 800, outer oil ring

[0058] 810. Outer oil ring connection part

[0059] 820. Outer oil baffle ring groove

[0060] 900, End support block

[0061] 910. Inner cooling oil passage

[0062] 920. Outer cooling oil passage

[0063] 930. Insulating pad Detailed Implementation

[0064] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application. The nouns and pronouns related to persons in this patent application are not limited to specific genders.

[0065] It should be noted that directional terms used in the specification of this application, such as up, down, inside, outside, etc., are all references to... Figure 1 The schematic three-dimensional diagram of a power transformer winding is used to illustrate this concept, especially for cylindrical structures. "Inner" refers to the direction closer to the central axis of the cylinder, while "outer" refers to the direction farther from the central axis. For example, for the inner oil baffle ring, inner support strip, outer oil baffle ring, and outer support strip, the side closer to the central axis of the power transformer winding is the "inner" surface, and the side farther from the central axis is the "outer" surface.

[0066] Reference Figure 1 and Figure 2 The image shows a power transformer winding according to an exemplary embodiment of this application. To more clearly illustrate the internal structure of the power transformer winding of this application, Figure 3 A quarter section of a power transformer winding is shown. (See also...) Figures 1 to 3 As can be seen, the power transformer winding includes: a coil body 100, composed of multiple coil discs 110 arranged axially, with a radial cooling oil channel 120 formed between each pair of adjacent coil discs 110; the coil body 100 having a first end and a second end opposite to the first end in the axial direction; an inner cylinder 500, disposed on the inner side of the inner circumferential surface of the coil body 100, the space between the outer circumferential surface of the inner cylinder 500 and the inner circumferential surface of the coil body 100 forming an inner cooling oil channel 910; and an outer cylinder 600, disposed on the outer side of the outer circumferential surface of the coil body 100, the space between the inner circumferential surface of the outer cylinder 600 and the outer circumferential surface of the coil body 100 forming an outer cooling oil channel 920. It is noted here that... Figure 1 and Figure 2 In the proposed design, the coil cylinder 100 is in a vertical position, and the first end of the coil cylinder 100 in the axial direction is... Figure 1 The lower end of the coil cylinder shown is shown, while the second end of the coil cylinder 100 in the axial direction is... Figure 1 The upper end of the coil cylinder shown.

[0067] Reference Figure 4The power transformer winding has a cooling oil flow path, which includes: a cooling oil inlet located at the first end of the coil cylinder 100, a cooling oil outlet located at the second end of the coil cylinder 100, and a cooling oil passage formed by the radial cooling oil passage 120, the inner cooling oil passage 910, and the outer cooling oil passage 920. Thus, the cooling oil flows in from the cooling oil inlet, passes through the cooling oil passage, and flows out from the cooling oil outlet to cool the coil cylinder 100. Figure 4 The arrowed lines schematically illustrate the overall flow path of the cooling oil. It's understandable that the actual flow path of the cooling oil is more complex. Figure 4 The image shown is a simplified view created solely for ease of understanding.

[0068] Reference Figure 5 and Figure 8 It can be seen that an insulating pad 930 can be arranged between every two adjacent coil discs 110. It should be understood that in the prior art, it is necessary to cut grooves in the insulating pad 930 to place a thin oil-blocking sheet structure, such as 1mm, which leads to a series of problems such as difficult processing, poor oil blocking effect and easy damage to the oil-blocking sheet.

[0069] This utility model solves the above-mentioned problems. In this utility model, the power transformer winding further includes: multiple support bars extending axially and fixed to the inner and outer circumferential surfaces of the coil cylinder 100, each support bar having a support bar connecting portion; and an oil baffle ring disposed in the inner cooling oil channel 910 and / or the outer cooling oil channel 920, the oil baffle ring extending circumferentially along the coil cylinder 100, the oil baffle ring causing the cooling oil flowing in the inner cooling oil channel 910 and / or the outer cooling oil channel 920 to change direction and flow towards the radial cooling oil channel 120, the oil baffle ring having an oil baffle ring connecting portion; the oil baffle ring and the multiple support bars are fixedly connected together through the connection between the oil baffle ring connecting portion and the support bar connecting portion.

[0070] Reference Figure 4 and Figure 7 The support bars include: multiple inner support bars 300 extending axially, fixed to the inner circumferential surface of the coil cylinder 100, and covered and in contact with the inner cylinder 500. Figure 4 The inner cylinder 500 is omitted in the text. Figure 3 The diagram shows an inner cylinder 500 and multiple outer support bars 400 extending axially, fixed to the outer circumferential surface of the coil cylinder 100, and covered and in contact with the outer cylinder 600. Figure 7 The outer cylinder 600 is omitted. Figure 6 The outer cylinder 600 is shown in the figure.

[0071] from Figure 4As can be seen, the upper ends of the multiple inner support strips 300 can be fixed to the upper end support block 900, and the lower ends of the multiple inner support strips 300 can be fixed to the lower end support block. The multiple inner support strips 300 can be fixed to the inner circumferential surface of the corresponding coil cake by known connection means, such as by adhesive bonding. Figure 7 As can be seen, the upper ends of the multiple outer support bars 400 can be fixed to the upper end support block 900, and the lower ends of the multiple outer support bars 400 can be fixed to the lower end support block. The multiple outer support bars 400 can be fixed to the outer circumferential surface of the corresponding coil cake by known connection means, such as by using glue to bond to the outer circumferential surface of the corresponding coil cake.

[0072] Reference Figure 4 and Figure 7 The oil baffle ring includes: one or more inner oil baffle rings 700, which extend circumferentially on the inner circumferential surface of the coil cylinder 100 to guide the cooling oil of the coil cylinder 100 from the inner cooling oil passage 910 to the radial cooling oil passage 120; and one or more outer oil baffle rings 800, which extend circumferentially on the outer circumferential surface of the coil cylinder 100 to guide the cooling oil of the coil cylinder 100 from the outer cooling oil passage 920 to the radial cooling oil passage 120.

[0073] Reference Figure 13 and Figure 14 The support bar connecting portion includes multiple inner support bar connecting portions 310 and multiple outer support bar connecting portions 410. (Refer to...) Figure 9 and Figure 10 The oil baffle ring connecting portion includes multiple inner oil baffle ring connecting portions 710 and multiple outer oil baffle ring connecting portions 810. Each inner oil baffle ring 700 is provided with multiple inner oil baffle ring connecting portions 710, and multiple inner support bars 300 are provided with multiple inner support bar connecting portions 310 for connecting with the multiple inner oil baffle ring connecting portions 710. The inner oil baffle ring 700 is fixed to the multiple inner support bars 300 by the connection between the multiple inner oil baffle ring connecting portions 710 and the multiple inner support bar connecting portions 310. Each outer oil baffle ring 800 is provided with multiple outer oil baffle ring connecting portions 810, and multiple outer support bars 400 are provided with multiple outer support bar connecting portions 410 for connecting with the multiple outer oil baffle ring connecting portions 810. The outer oil baffle ring 800 is fixed to the multiple outer support bars 400 by the connection between the multiple outer oil baffle ring connecting portions 810 and the multiple outer support bar connecting portions 410.

[0074] Reference Figure 10 The multiple inner oil baffle ring connecting portions 710 can be formed as multiple inner oil baffle ring grooves 720 opened on the inner oil baffle ring 700, as shown in the figure. Figure 13The multiple inner support bar connecting portions 310 can be formed as multiple inner support bar grooves 320 opened on the multiple inner support bars 300, while referring to Figure 11 The position and shape of each inner oil baffle ring groove 720 are adapted to the position and shape of the corresponding inner support strip groove 320 to overlap and fix them together. (Refer to...) Figure 9 Multiple outer oil ring connecting portions 810 can be formed as multiple outer oil ring grooves 820 opened on the outer oil ring 800, as shown in the figure. Figure 14 The multiple outer support strip connecting portions 410 can be formed as multiple outer support strip grooves 420 opened on the multiple outer support strips 400, while referring to Figure 12 The position and shape of each outer oil baffle groove 820 are adapted to the position and shape of the corresponding outer support strip groove 420 to overlap and fix them together.

[0075] Reference Figure 10 and Figure 11 Multiple inner oil-blocking ring grooves 720 are formed on the surface of the inner oil-blocking ring 700 opposite to the coil cylinder 100. (Refer to...) Figure 11 and Figure 13 Multiple inner support strip grooves 320 are formed on the surfaces of multiple inner support strips 300 that face the coil cylinder 100. (Refer to...) Figure 9 and Figure 12 Multiple outer oil baffle ring grooves 820 are formed on the surface of the outer oil baffle ring 800 opposite to the coil cylinder 100. (Refer to...) Figure 12 and Figure 14 Multiple outer support bar grooves 420 are formed on the surfaces of multiple outer support bars 400 that face the coil cylinder 100.

[0076] Reference Figure 10 The thickness of the inner oil baffle ring 700 in the radial direction is the same as the thickness of the inner support strip 300 in the radial direction; the inner oil baffle ring groove 720 extends through the inner oil baffle ring 700 in the axial direction, and the depth of the inner oil baffle ring groove 720 in the radial direction is half the thickness of the inner oil baffle ring 700 in the radial direction. (Refer to...) Figure 13 The inner support strip groove 320 extends circumferentially through the corresponding inner support strip 300, and the depth of the inner support strip groove 320 in the radial direction is half the thickness of the corresponding inner support strip 300 in the radial direction. (Refer to...) Figure 10 , Figure 11 and Figure 13Each inner oil baffle ring groove 720 overlaps with the corresponding inner support strip groove 320, such that the inner surface of the inner oil baffle ring 700 and the inner surface of the inner support strip 300 are aligned, and the outer surface of the inner oil baffle ring 700 and the outer surface of the inner support strip 300 are aligned. In particular, the inner surface of the inner oil baffle ring 700 contacts the outer circumferential surface of the inner cylinder 500 to form a closed flow path for the cooling oil in the inner cooling oil passage.

[0077] Reference Figure 9 The outer oil baffle ring 800 has the same radial thickness as the outer support strip 400; the outer oil baffle ring groove 820 extends through the outer oil baffle ring 800 in the axial direction, and the radial depth of the outer oil baffle ring groove 820 is half the radial thickness of the outer oil baffle ring 800. (Refer to...) Figure 14 Each outer support strip groove 420 extends circumferentially through the corresponding outer support strip 400, and the depth of each outer support strip groove 420 in the radial direction is half the thickness of the corresponding outer support strip 400 in the radial direction. (Refer to...) Figure 9 , Figure 12 and Figure 14 Each outer oil baffle ring groove 820 overlaps with the corresponding outer support strip groove 420, such that the inner surface of the outer oil baffle ring 800 and the inner surface of the outer support strip 400 are aligned, and the outer surface of the outer oil baffle ring 800 and the outer surface of the outer support strip 400 are also aligned. Specifically, the outer surface of the outer oil baffle ring 800 contacts the inner circumferential surface of the outer cylinder 600 to form a closed flow path for the cooling oil in the outer cooling oil channels.

[0078] Reference Figure 4 The inner oil baffle ring 700 has the same axial width as a coil disc 110, and the outer oil baffle ring 800 has the same axial width as a coil disc 110. The inner and outer oil baffle rings 700 are arranged at different positions along the axial direction, for example, staggered. Furthermore, the axial position of the inner oil baffle ring 700 is aligned with the axial position of a corresponding coil disc 110, and the axial position of the outer oil baffle ring 800 is aligned with the axial position of a corresponding coil disc 110.

[0079] Reference Figure 4The inner oil retaining ring 700 includes a first inner oil retaining ring and a second inner oil retaining ring. The first inner oil retaining ring is located at the first end of the coil cylinder 100, i.e., the upper end position. The second inner oil retaining ring is located at the middle position of the coil cylinder 100 in the axial direction. The outer oil retaining ring 800 includes a first outer oil retaining ring and a second outer oil retaining ring. The first outer oil retaining ring is located at the middle position between the first inner oil retaining ring and the second inner oil retaining ring. The second outer oil retaining ring is located at the middle position between the second inner oil retaining ring and the second end of the coil cylinder 100.

[0080] It should be noted that the inner oil baffle ring 700 can be a 360-degree ring composed of multiple segments (such as four segments or two segments) connected to each other, and the outer oil baffle ring 800 can be a 360-degree ring composed of multiple segments (such as four segments or two segments) connected to each other.

[0081] This utility model also provides a power transformer, specifically, the power transformer includes any of the above-mentioned power transformer windings.

[0082] Compared with the existing oil baffle structure, the oil baffle ring of the power transformer winding of this utility model has at least the following advantages:

[0083] First, the placement of the oil baffle ring can be determined based on the design, allowing for more optimization possibilities.

[0084] Secondly, the installation of the oil baffle ring is facilitated by the snap-fit ​​connection between the support bar connecting part and the oil baffle ring connecting part.

[0085] Third, the oil retaining ring of the power transformer winding of this utility model significantly improves the effect of locally blocking oil flow in the winding.

[0086] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A power transformer winding, comprising: A coil cylinder (100) is composed of a plurality of coil discs (110) arranged along the axial direction, and a radial cooling oil channel (120) is formed between two adjacent coil discs (110). The coil cylinder (100) has a first end and a second end opposite to the first end in the axial direction. An inner cylinder (500) is disposed on the inner side of the inner circumferential surface of the coil cylinder (100), and the space between the outer circumferential surface of the inner cylinder (500) and the inner circumferential surface of the coil cylinder (100) forms an inner cooling oil channel (910). An outer cylinder (600) is disposed on the outer side of the outer circumferential surface of the coil cylinder (100), and the space between the inner circumferential surface of the outer cylinder (600) and the outer circumferential surface of the coil cylinder (100) forms an outer cooling oil channel (920). The power transformer winding is characterized in that it has a cooling oil flow path, which includes: a cooling oil inlet located at the first end of the coil cylinder (100), a cooling oil outlet located at the second end of the coil cylinder (100), and a cooling oil passage formed by the radial cooling oil channel, the inner cooling oil channel (910), and the outer cooling oil channel (920), wherein cooling oil flows in from the cooling oil inlet, passes through the cooling oil passage, and flows out from the cooling oil outlet to cool the coil cylinder; the power transformer winding further includes: Multiple support bars extend along the axial direction and are fixed to the inner and outer circumferential surfaces of the coil cylinder (100), each support bar having a support bar connecting portion; and An oil baffle ring is disposed in the inner cooling oil channel (910) and / or the outer cooling oil channel (920). The oil baffle ring extends along the circumferential direction of the coil cylinder (100). The oil baffle ring causes the cooling oil flowing in the inner cooling oil channel (910) and / or the outer cooling oil channel (920) to change direction and flow toward the radial cooling oil channel (120). The oil baffle ring has an oil baffle ring connecting portion. The oil baffle ring and the plurality of support bars are fixedly connected together through the connection between the oil baffle ring connecting part and the support bar connecting part.

2. The power transformer winding according to claim 1, characterized in that, The plurality of support bars include: Multiple inner support strips (300), the outer surfaces of which are fixed to the inner circumferential surface of the coil cylinder (100), and the inner surfaces of which are in contact with the inner cylinder (500); and Multiple outer support strips (400) are provided, the inner surfaces of which are fixed to the outer circumferential surface of the coil cylinder (100), and the outer surfaces of which are in contact with the outer cylinder (600). The oil baffle ring includes: One or more inner oil baffle rings (700) extending circumferentially on the inner circumferential surface of the coil cylinder (100) for guiding cooling oil from the inner cooling oil passage (910) to the radial cooling oil passage (120); and One or more outer oil baffle rings (800) extending circumferentially on the outer circumferential surface of the coil cylinder (100) for guiding cooling oil from the outer cooling oil passage (920) to the radial cooling oil passage (120). The support bar connecting part includes multiple inner support bar connecting parts (310) and multiple outer support bar connecting parts (410); The oil baffle ring connecting part includes multiple inner oil baffle ring connecting parts (710) and multiple outer oil baffle ring connecting parts (810); The inner oil baffle ring (700) is provided with a plurality of inner oil baffle ring connecting parts (710), and the plurality of inner support bars (300) are provided with a plurality of inner support bar connecting parts (310) for connecting with the plurality of inner oil baffle ring connecting parts (710). The inner oil baffle ring (700) is fixed to the plurality of inner support bars (300) by the connection between the plurality of inner oil baffle ring connecting parts (710) and the plurality of inner support bar connecting parts (310). Furthermore, the outer oil baffle ring (800) is provided with a plurality of outer oil baffle ring connecting portions (810), and the plurality of outer support bars (400) are provided with a plurality of outer support bar connecting portions (410) for connecting with the plurality of outer oil baffle ring connecting portions (810). The outer oil baffle ring (800) is fixed to the plurality of outer support bars (400) by the connection between the plurality of outer oil baffle ring connecting portions (810) and the plurality of outer support bar connecting portions (410).

3. The power transformer winding according to claim 2, characterized in that, The plurality of inner oil baffle ring connecting portions (710) include a plurality of inner oil baffle ring grooves (720) formed on the inner oil baffle ring (700), and the plurality of inner support strip connecting portions (310) include a plurality of inner support strip grooves (320) formed on the plurality of inner support strips (300). The positions and shapes of the plurality of inner oil baffle ring grooves (720) are adapted to the positions and shapes of the plurality of inner support strip grooves (320) to overlap and fix them together. Furthermore, the plurality of outer oil baffle ring connecting portions (810) include a plurality of outer oil baffle ring grooves (820) opened on the outer oil baffle ring (800), and the plurality of outer support strip connecting portions (410) include a plurality of outer support strip grooves (420) opened on the plurality of outer support strips (400). The positions and shapes of the plurality of outer oil baffle ring grooves (820) are adapted to the positions and shapes of the plurality of outer support strip grooves (420) to overlap and fix them together.

4. The power transformer winding according to claim 3, characterized in that, Multiple inner oil baffle ring grooves (720) are formed on the inner surface of the inner oil baffle ring (700) opposite to the coil cylinder (100), and multiple inner support strip grooves (320) are formed on the outer surface of the multiple inner support strips (300) facing the coil cylinder (100). Furthermore, multiple outer oil baffle ring grooves (820) are formed on the outer surface of the outer oil baffle ring (800) opposite to the coil cylinder (100), and multiple outer support strip grooves (420) are formed on the inner surface of the multiple outer support strips (400) facing the coil cylinder (100).

5. The power transformer winding according to claim 4, characterized in that, The thickness of the inner oil baffle ring (700) in the radial direction is the same as the thickness of the inner support strip (300) in the radial direction; the inner oil baffle ring groove (720) extends through the inner oil baffle ring (700) in the axial direction, and the depth of the inner oil baffle ring groove (720) in the radial direction is half the thickness of the inner oil baffle ring (700) in the radial direction; the inner support strip groove (320) extends through the inner support strip (300) in the circumferential direction, and the inner support strip groove... (320) The depth in the radial direction is half the thickness of the inner support strip (300) in the radial direction; the inner oil baffle ring groove (720) overlaps with the inner support strip groove (320), such that the inner surface of the inner oil baffle ring (700) and the inner surface of the inner support strip (300) are aligned with each other, the outer surface of the inner oil baffle ring (700) and the outer surface of the inner support strip (300) are aligned with each other, and the inner surface of the inner oil baffle ring (700) contacts the outer circumferential surface of the inner cylinder (500); Furthermore, the thickness of the outer oil baffle ring (800) in the radial direction is the same as the thickness of the outer support strip (400) in the radial direction; the outer oil baffle ring groove (820) extends through the outer oil baffle ring (800) in the axial direction, and the depth of the outer oil baffle ring groove (820) in the radial direction is half the thickness of the outer oil baffle ring (800) in the radial direction; the outer support strip groove (420) extends through the outer support strip (400) in the circumferential direction, and the outer support strip... The depth of the groove (420) in the radial direction is half the thickness of the outer support strip (400) in the radial direction; the outer oil baffle ring groove (820) overlaps with the outer support strip groove (420), such that the inner surface of the outer oil baffle ring (800) and the inner surface of the outer support strip (400) are aligned with each other, the outer surface of the outer oil baffle ring (800) and the outer surface of the outer support strip (400) are aligned with each other, and the outer surface of the outer oil baffle ring (800) contacts the inner circumferential surface of the outer cylinder (600).

6. The power transformer winding according to claim 2, characterized in that, The width of the inner oil baffle ring (700) in the axial direction is the same as the width of one of the coil cakes (110) in the axial direction, and the width of the outer oil baffle ring (800) in the axial direction is the same as the width of one of the coil cakes (110) in the axial direction. Furthermore, the inner oil baffle ring (700) is aligned with the position of one of the coil discs (110) in the axial direction, and the outer oil baffle ring (800) is aligned with the position of one of the coil discs (110) in the axial direction.

7. The power transformer winding according to claim 2, characterized in that, The inner oil baffle ring (700) and the outer oil baffle ring (800) are arranged at different positions along the axial direction.

8. The power transformer winding according to claim 7, characterized in that, The inner oil baffle ring (700) includes a first inner oil baffle ring and a second inner oil baffle ring. The first inner oil baffle ring is located at the first end of the coil cylinder (100), and the second inner oil baffle ring is located at the middle position of the coil cylinder (100) in the axial direction. Furthermore, the outer oil baffle ring (800) includes a first outer oil baffle ring and a second outer oil baffle ring. The first outer oil baffle ring is located at the middle position between the first inner oil baffle ring and the second inner oil baffle ring, and the second outer oil baffle ring is located at the middle position between the second inner oil baffle ring and the second end of the coil cylinder (100).

9. The power transformer winding according to claim 2, characterized in that, The inner oil baffle ring (700) is a 360-degree ring composed of multiple interconnected segments, and the outer oil baffle ring (800) is a 360-degree ring composed of multiple interconnected segments.

10. A power transformer, characterized in that, The power transformer includes power transformer windings according to any one of claims 1 to 9.

Images