Axially split coil structure and transformer

Abstract

The utility model discloses an axial split coil structure and a transformer, comprising an innermost base cylinder, a first coil component and a second coil component, wherein the first coil component and the second coil component are axially distributed up and down, and a ferrule component is arranged between the first coil component and the second coil component; the utility model arranges the split coil at the low-voltage end of the transformer as the first coil component and the second coil component of two independent structures, and adopts this structure to separate the first coil component and the second coil component from the innermost base cylinder respectively during the winding process, so as to facilitate the measurement and adjustment of the height of each coil after winding and drying, thereby ensuring that the actual size of the coil at the low-voltage end of the transformer is consistent with the design size, so as to improve the product quality.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-immersed transformers, in particular to an axially split coil structure and a transformer. Background Art

[0002] In recent years, the pace of global energy transformation and energy infrastructure construction has accelerated, bringing about vigorous development in the field of new energy and a new upgrade of traditional power systems. Against this background, global new energy power generation projects are also increasing year by year, such as wind power and solar power generation. The capacity of a single unit of new energy power generation is relatively small, but the number of units is large. In the process of step-up transmission, considering the economy, high-voltage, large-capacity, low-voltage split transformers are often used to reduce transformer costs and floor space. For high-voltage split transformers, if the coil adopts a radial split structure, it often brings about a complex coil end insulation design, so it is often more inclined to adopt an axial split coil structure.

[0003] In addition to the need for reasonable design, high-voltage split transformers also need to ensure that the structure meets the designed dimensions during the manufacturing process, which is crucial to the quality of the transformer. The coil is an important component of the transformer. How to ensure that the coil meets the design requirements during winding is also a key consideration during transformer manufacturing. Based on the existing conventional coil structure, the coil is often unable to be calibrated and adjusted after winding, which can easily cause deviations between the actual production size of the coil and the designed size.

[0004] In view of the above-mentioned defects, the inventor of the present invention finally obtained the present invention after a long period of research and practice. Utility Model Content

[0005] In order to solve the above-mentioned technical defects, the technical solution adopted by the utility model is to provide an axially split coil structure, including an innermost basic tube, a first coil assembly and a second coil assembly, the first coil assembly is sleeved on the lower part of the innermost basic tube, the second coil assembly is sleeved on the upper part of the innermost basic tube, the first coil assembly and the second coil assembly are axially distributed up and down, a ring assembly is arranged between the first coil assembly and the second coil assembly, the lower part of the first coil assembly is provided with a bottom oil baffle plate group, a bottom end ring group, a bottom pad group and a bottom sleeve plate group, the bottom sleeve plate group, the bottom pad group, the bottom end ring group and the bottom oil baffle plate group are arranged in sequence from bottom to top on the support end ring, the lower part of the second coil assembly is supported by the ring assembly, and the upper part of the second coil assembly is provided with a top oil baffle plate group, a top end ring group, a top sleeve plate group and a top pad group in sequence from bottom to top.

[0006] Preferably, the first coil assembly includes a first inner coil, a first insulating cylinder and a first outer coil arranged in sequence from the inside to the outside, a first innermost supporting strut is arranged between the first inner coil and the innermost base cylinder, a first inner separating strut is arranged between the first inner coil and the first insulating cylinder, a first outer separating strut is arranged between the first insulating cylinder and the first outer coil, and a first outermost supporting strut is arranged outside the first outer coil;

[0007] The second coil assembly includes a second inner coil, a second insulating cylinder and a second outer coil which are arranged in sequence from the inside to the outside. A second innermost support strut is arranged between the second inner coil and the innermost base cylinder, a second inner partition strut is arranged between the second inner coil and the second insulating cylinder, a second outer partition strut is arranged between the second insulating cylinder and the second outer coil, a second outermost support strut is arranged on the outside of the second outer coil to support and stabilize the overall structure of the second coil assembly, and a support pad is arranged at the bottom of the second outer coil.

[0008] Preferably, a first inner sleeve plate, a first inner electrostatic ring and a first inner angle ring are arranged on the inner diameter side above the first inner coil, the first inner electrostatic ring is arranged between the first inner angle ring and the first inner coil, the first inner sleeve plate is arranged between the first inner electrostatic ring and the first inner angle ring, and between the first inner electrostatic ring and the first inner coil, and a first outer sleeve plate, a first outer electrostatic ring and a first outer angle ring are arranged on the outer diameter side above the first outer coil, the first outer electrostatic ring is arranged between the first outer angle ring and the first outer coil, the first outer sleeve plate is arranged between the first outer electrostatic ring and the first outer angle ring, and between the first outer electrostatic ring and the first outer coil.

[0009] Preferably, a second inner sleeve plate, a second inner electrostatic ring and a second inner angle ring are provided on the inner diameter side below the second inner coil, the second inner electrostatic ring is provided between the second inner angle ring and the second inner coil, the second inner sleeve plate is provided between the second inner electrostatic ring and the second inner angle ring, and between the second inner electrostatic ring and the second inner coil, and a second outer sleeve plate, a second outer electrostatic ring and a second outer angle ring are provided on the outer diameter side below the second outer coil, the second outer electrostatic ring is provided between the second outer angle ring and the second outer coil, the second outer sleeve plate is provided between the second outer electrostatic ring and the second outer angle ring, and between the second outer electrostatic ring and the second outer coil.

[0010] Preferably, the ferrule assembly includes a septum gasket block group and a septum sleeve plate group, and the septum gasket block group is arranged between the septum sleeve plate group and the first coil assembly and the second coil assembly.

[0011] Preferably, the middle spacer block group includes a first lower block, a second lower block and an upper block, the first lower block and the second lower block are arranged at the bottom of the middle spacer sleeve group, the first lower block and the second lower block correspond to the first inner coil and the first outer coil respectively, and the upper block is arranged at the top of the middle spacer sleeve group.

[0012] Preferably, the first inner coil and the first outer coil are both spiral structures and are connected by transition transposition at the top of the first coil assembly to form a ∩-shaped coil structure; the second inner coil and the second outer coil are spiral structures and are connected by transition transposition at the bottom of the second coil assembly to form a U-shaped coil structure; the first coil assembly and the second coil assembly are both provided with a strong oil-guided cooling structure.

[0013] Preferably, the bottom oil baffle plate group includes a bottom inner oil baffle plate and a bottom outer oil baffle plate, the bottom inner oil baffle plate is correspondingly arranged below the first inner coil, the bottom outer oil baffle plate is correspondingly arranged below the first outer coil, and the bottom inner oil baffle plate and the bottom outer oil baffle plate are separated by the first insulating tube; the bottom end ring group includes a bottom inner end ring and a bottom outer end ring, the bottom inner end ring and the bottom inner oil baffle plate are correspondingly arranged, and the bottom outer end ring and the bottom outer oil baffle plate are correspondingly arranged.

[0014] Preferably, the top oil baffle plate group includes a top inner oil baffle plate and a top outer oil baffle plate, the top end ring group includes a top inner end ring and a top outer end ring, the top sleeve plate group includes a top inner sleeve plate and a top outer sleeve plate, the top gasket block group includes a top inner gasket block and a top outer gasket block, the top inner oil baffle plate, the top inner end ring, the top inner sleeve plate and the top inner gasket block are correspondingly arranged above the second inner coil, and the top outer oil baffle plate, the top outer end ring, the top outer sleeve plate and the top outer gasket block are correspondingly arranged above the second outer coil.

[0015] Preferably, a transformer includes a winding part, which is sleeved on an iron core in an oil tank, the winding assembly includes a low-voltage winding and a high-voltage winding, the low-voltage winding and the high-voltage winding are arranged correspondingly, and the low-voltage winding adopts the axial split coil structure.

[0016] Compared with the prior art, the beneficial effect of the utility model is that the utility model sets the split coil at the low-voltage end of the transformer as the first coil component and the second coil component of two independent structures. With this structure, the first coil component and the second coil component can be separated from the innermost base cylinder during the winding process, which is convenient for measuring and adjusting the height of each coil after winding and drying, thereby ensuring that the actual size of the transformer low-voltage end coil is consistent with the design size, so as to improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural view of the axial split coil structure;

[0018] Figure 2 is a schematic diagram of the structure after the first coil assembly in step S1 is wound;

[0019] Figure 3 It is a structural schematic diagram of placing the ferrule assembly in the step S1;

[0020] Figure 4 is a schematic diagram of the structure after the second coil assembly in step S1 is wound;

[0021] Figure 5 is a schematic diagram of the structure after the second coil assembly is detached in step S3;

[0022] Figure 6 is a schematic diagram of the structure after the first coil assembly is detached in the step S3;

[0023] Figure 7 It is a structural schematic diagram of installing the corner ring in the step S3;

[0024] Figure 8 A front view of the structure of the winding tooling;

[0025] Fig. 9 A top view of the structure of the winding tooling;

[0026] Fig.10 A front view of the structure of using the winding tool to wind the first outer coil;

[0027] Fig.11 A bottom view of the structure for winding the first outer coil using the winding tool;

[0028] Fig.12 A front view of the structure for winding the second inner coil using the winding tool;

[0029] Fig.13This is a bottom view of the structure for winding the second inner coil using the winding tool.

[0030] The numbers in the figure represent:

[0031] 1-innermost base tube; 2-first coil assembly; 3-second coil assembly; 4-ferrule assembly; 5-support end ring; 8-winding tooling; 9-tightening belt; 21-first inner coil; 22-first insulating tube; 23-first outer coil; 24-first innermost support stay; 25-first inner partition stay; 26-first outer partition stay; 27-first outermost support stay; 31-second inner coil; 32-second insulating tube; 33-second outer coil; 34-second innermost support stay; 35-second inner partition stay; 36-second outer partition stay; 37-second outermost support stay; 38-support pad; 41-first lower pad; 42-second lower pad; 43-upper pad; 44-middle spacer sleeve assembly; 61-bottom oil baffle assembly; 6 2-bottom end ring group; 63-bottom pad group; 64-bottom sleeve group; 71-top oil baffle group; 72-top end ring group; 73-top sleeve group; 74-top pad group; 81-connecting plate; 82-support plate; 83-clamping groove; 211-first inner sleeve; 212-first inner electrostatic ring; 213-first inner angle ring; 231-first outer sleeve; 232-first outer electrostatic ring; 233-first outer angle ring; 311-second inner sleeve; 312-second inner electrostatic ring; 313-second inner angle ring; 331-second outer sleeve; 332-second outer electrostatic ring; 333-second outer angle ring; 611-bottom inner oil baffle; 612-bottom outer oil baffle; 621-bottom inner end ring; 622-bottom outer end ring. DETAILED DESCRIPTION

[0032] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0033] Embodiment 1

[0034] like Figure 1 As shown, Figure 1 A structural view of the axially split coil structure.

[0035] The axial split coil structure of the utility model comprises an innermost base tube 1, a first coil assembly 2 and a second coil assembly 3, wherein the first coil assembly 2 is sleeved on the lower part of the innermost base tube 1, and the second coil assembly 3 is sleeved on the upper part of the innermost base tube 1, the first coil assembly 2 and the second coil assembly 3 are axially distributed up and down, a ferrule assembly 4 is arranged between the first coil assembly 2 and the second coil assembly 3, and a bottom oil baffle plate group 61, a bottom end coil group 62, and a bottom end coil group 63 are arranged at the lower part of the first coil assembly 2. The bottom gasket group 63 and the bottom sleeve plate group 64, the bottom gasket group 63, the bottom end ring group 62 and the bottom oil baffle plate group 61 are arranged in sequence from bottom to top on the support end ring 5, the first coil assembly 2 is supported by the support end ring 5 to fix the overall structure and position, the bottom of the second coil assembly 3 is supported by the sleeve plate assembly 4, and the upper part of the second coil assembly 3 is arranged in sequence from bottom to top on the top oil baffle plate group 71, the top end ring group 72, the top sleeve plate group 73 and the top gasket group 74.

[0036] Specifically, the first coil assembly 2 includes a first inner coil 21, a first insulating tube 22 and a first outer coil 23 which are arranged in sequence from the inside to the outside. A first innermost supporting strut 24 is arranged between the first inner coil 21 and the innermost base tube 1, a first inner separating strut 25 is arranged between the first inner coil 21 and the first insulating tube 22, a first outer separating strut 26 is arranged between the first insulating tube 22 and the first outer coil 23, and a first outermost supporting strut 27 is arranged on the outside of the first outer coil 23 to support and stabilize the overall structure of the first coil assembly 2.

[0037] A first inner sleeve plate 211, a first inner electrostatic ring 212 and a first inner angle ring 213 are arranged on the inner diameter side above the first inner coil 21. The first inner electrostatic ring 212 is arranged between the first inner angle ring 213 and the first inner coil 21. The first inner sleeve plate 211 is arranged between the first inner electrostatic ring 212 and the first inner angle ring 213, and between the first inner electrostatic ring 212 and the first inner coil 21. A first outer sleeve plate 231, a first outer electrostatic ring 232 and a first outer angle ring 233 are arranged on the outer diameter side above the first outer coil 23. The first outer electrostatic ring 232 is arranged between the first outer angle ring 233 and the first outer coil 23. The first outer sleeve plate 231 is arranged between the first outer electrostatic ring 232 and the first outer angle ring 233, and between the first outer electrostatic ring 232 and the first outer coil 23.

[0038] The second coil assembly 3 includes a second inner coil 31, a second insulating tube 32 and a second outer coil 33 which are arranged in sequence from the inside to the outside. A second innermost support strut 34 is arranged between the second inner coil 31 and the innermost base tube 1, a second inner partition strut 35 is arranged between the second inner coil 31 and the second insulating tube 32, a second outer partition strut 36 is arranged between the second insulating tube 32 and the second outer coil 33, a second outermost support strut 37 is arranged on the outside of the second outer coil 33 to support and stabilize the overall structure of the second coil assembly 3, and a support pad 38 is arranged at the bottom of the second outer coil 33, and the support pad 38 is used to support the second outermost support strut 37.

[0039] A second inner sleeve plate 311, a second inner electrostatic ring 312 and a second inner angle ring 313 are arranged on the inner diameter side below the second inner coil 31, the second inner electrostatic ring 312 is arranged between the second inner angle ring 313 and the second inner coil 31, the second inner sleeve plate 311 is arranged between the second inner electrostatic ring 312 and the second inner angle ring 313, and between the second inner electrostatic ring 312 and the second inner coil 31, a second outer sleeve plate 331, a second outer electrostatic ring 332 and a second outer angle ring 333 are arranged on the outer diameter side below the second outer coil 33, the second outer electrostatic ring 332 is arranged between the second outer angle ring 333 and the second outer coil 33, the second outer sleeve plate 331 is arranged between the second outer electrostatic ring 332 and the second outer angle ring 333, and between the second outer electrostatic ring 332 and the second outer coil 33.

[0040] The utility model adopts this insulation structure to effectively ensure the insulation of the upper end of the first coil component 2 and the lower end of the second coil component 3 to the inner diameter side iron core, the insulation between the upper end of the first coil component 2 and the lower end of the second coil component 3, and the insulation between the first coil component 2 and the second coil component 3 to the outer high-voltage coil.

[0041] The ferrule assembly 4 includes a spacer block group and a spacer sleeve group 44. The spacer block group is arranged between the spacer sleeve group 44 and the first coil assembly 2 and the second coil assembly 3 to provide stable support for the second coil assembly 3.

[0042] Preferably, the middle spacer block group includes a first lower block 41, a second lower block 42 and an upper block 43, the first lower block 41 and the second lower block 42 are arranged at the bottom of the middle spacer sleeve group 44, the first lower block 41 and the second lower block 42 correspond to the first inner coil 21 and the first outer coil 23 respectively, and the upper block 43 is arranged at the top of the middle spacer sleeve group 44 to support the second inner coil 31, the second insulating tube 32 and the second outer coil 33.

[0043] When both low-voltage sides of the split transformer are connected to the power supply, it is necessary to consider the short-circuit situation between the two split low-voltage sides. In order to improve the short-circuit resistance of a large-capacity axial split transformer when a short circuit occurs between the two split low-voltage sides, the transformer is usually required to have a high impedance splitting coefficient to increase the impedance between the two split low-voltage coils. The impedance between the two axially split coil structures can be increased by increasing the axial distance between the two axially split coil structures, but this also brings about insulation problems. The utility model provides a reliable insulation structure by arranging electrostatic rings and angle rings on the inner and outer diameter sides between the two axially split coil structures to ensure the insulation of the two axially split coil structures to the inner iron core, the insulation between the two axially split coil structures, and the insulation between the two axially split coil structures to the outer high-voltage coils.

[0044] Specifically, the first inner coil 21 and the first outer coil 23 are both spiral structures and are connected by transition transposition at the top of the first coil assembly 2 to form a ∩-shaped coil structure; the second inner coil 31 and the second outer coil 33 are spiral structures and are connected by transition transposition at the bottom of the second coil assembly 3 to form a U-shaped coil structure; the first coil assembly 2 and the second coil assembly 3 are both provided with a strong oil-guided cooling structure.

[0045] Preferably, the bottom oil baffle plate group 61 includes a bottom inner oil baffle plate 611 and a bottom outer oil baffle plate 612, the bottom inner oil baffle plate 611 is correspondingly arranged below the first inner coil 21, and the bottom outer oil baffle plate 612 is correspondingly arranged below the first outer coil 23, the bottom inner oil baffle plate 611 and the bottom outer oil baffle plate 612 are separated by the first insulating tube 22 to ensure the stability of the strong oil-guided cooling structure of the first inner coil 21 and the first outer coil 23; the bottom end circle group 62 includes a bottom inner end circle 621 and a bottom outer end circle 622, the bottom inner end circle 621 and the bottom inner oil baffle plate 611 are correspondingly arranged, and the bottom outer end circle 622 and the bottom outer oil baffle plate 612 are correspondingly arranged to ensure the stability of the positions of the bottom inner oil baffle plate 611 and the bottom outer oil baffle plate 612.

[0046] The top oil baffle plate group 71 includes a top inner oil baffle plate and a top outer oil baffle plate, the top end ring group 72 includes a top inner end ring and a top outer end ring, the top sleeve plate group 73 includes a top inner sleeve plate and a top outer sleeve plate, the top gasket block group 74 includes a top inner gasket block and a top outer gasket block, the top inner oil baffle plate, the top inner end ring, the top inner sleeve plate and the top inner gasket block are correspondingly arranged above the second inner coil 31, and the top outer oil baffle plate, the top outer end ring, the top outer sleeve plate and the top outer gasket block are correspondingly arranged above the second outer coil 33, so as to ensure the stability of the strong oil-guided cooling structure of the second inner coil 31 and the second outer coil 33.

[0047] Since the coil loss of large-capacity axially split transformers is relatively large, the structural setting of the utility model adopts strong oil-guided cooling and structure, which will more effectively reduce the coil temperature rise, extend the service life of the transformer and reduce the number of cooling equipment used compared with the conventional self-cooling cooling method.

[0048] The utility model sets the split coil of the low-voltage end of the transformer as the first coil component 2 and the second coil component 3 of two independent structures. With this structure, the first coil component 2 and the second coil component 3 can be separated from the innermost base tube 1 during the winding process, so as to facilitate the measurement and adjustment of the height of each coil after winding and drying, thereby ensuring that the actual size of the transformer low-voltage end coil is consistent with the designed size, so as to improve product quality.

[0049] Embodiment 2

[0050] The transformer of the utility model comprises a winding part, which is sleeved on an iron core in an oil tank. The winding assembly comprises a low-voltage winding and a high-voltage winding. The low-voltage winding and the high-voltage winding are arranged correspondingly, and the low-voltage winding adopts the axial split coil structure.

[0051] The utility model sets the split coil of the low-voltage end of the transformer as the first coil component 2 and the second coil component 3 of two independent structures. With this structure, the first coil component 2 and the second coil component 3 can be separated from the innermost base tube 1 during the winding process, so as to facilitate the measurement and adjustment of the height of each coil after winding and drying, thereby ensuring that the actual size of the transformer low-voltage end coil is consistent with the designed size, so as to improve product quality.

[0052] Embodiment 3

[0053] The specific manufacturing method of the axial split coil structure of the utility model comprises the following steps:

[0054] S1, the first coil assembly 2 and the second coil assembly 3 are wound on the innermost base tube 1 to form a prefabricated split coil;

[0055] S2, drying the prefabricated split coil under pressure;

[0056] S3, detaching the first coil assembly 2 and the second coil assembly 3 from the innermost base tube 1, adjusting their sizes, and then installing them again.

[0057] like Figures 2 to 7 As shown, Figure 2 is a schematic diagram of the structure after the first coil assembly in step S1 is wound; Figure 3 It is a structural schematic diagram of placing the ferrule assembly in the step S1; Figure 4 is a schematic diagram of the structure after the second coil assembly in step S1 is wound; Figure 5 is a schematic diagram of the structure after the second coil assembly is detached in step S3; Figure 6 is a schematic diagram of the structure after the first coil assembly is detached in the step S3; Figure 7 It is a schematic diagram of the structure of installing the corner ring in step S3.

[0058] Specifically, in step S1, the support end ring 5 is placed on the support platform at the bottom of the vertical winding machine, and then the innermost base tube 1 is inserted into the vertical winding machine and placed on the support end ring 5; secondly, the first innermost support struts 24 are placed equidistantly in a circle on the outer surface of the innermost base tube 1, and the first innermost support struts 24 are lifted up so as not to contact the support end ring 5; then, the bottom sleeve plate group 64, the bottom gasket group 63, the bottom end ring group 62 and the bottom oil baffle plate group 61 are placed in sequence on the support end ring 5.

[0059] Then, the first inner coil 21 is wound upward from the bottom of the first coil assembly 2. After winding to the top of the first inner coil 21, the first inner electrostatic ring 212 is welded to the single wire of the conductor. After welding, the first inner dividing strut 25, the first insulating tube 22 and the first outer dividing strut 26 are placed, and then the conductor is transitioned to the outer diameter side of the first coil assembly 2 to start winding the first outer coil 23, and the conductor of the first outer coil 23 is supported by the winding tool 8. After the first cake wire on the upper part of the first outer coil 23 is wound, the first outer electrostatic ring 232 is welded to the single wire of the conductor.

[0060] Since the first outer coil 23 is wound from the upper part to the lower part, the winding tool 8 needs to support the wire along the winding direction during winding, and the outer side of the winding tool 8 is tightened with a tightening belt 9. After the first outer coil 23 is wound, it is located on the previously placed bottom end coil group 62 and the bottom oil baffle plate group 61.

[0061] After the first coil assembly 2 is wound, a sleeve plate is placed on the first inner electrostatic ring 212 and the first outer electrostatic ring 232, and the ring assembly 4 is arranged on the sleeve plate, and the second innermost supporting stay 34 is arranged on the ring assembly 4, and then the second inner coil 31 is wound from top to bottom. The winding process of the second inner coil 31 adopts the winding tool 8 to support the wire along the winding direction, and the outer side of the winding tool 8 is tightened with the tightening belt 9.

[0062] After winding to the bottom of the second inner coil 31, the outlet wire of the second inner electrostatic ring 312 is welded to the single wire of the conductor; after welding, the second inner partition support 35, the second insulating cylinder 32 and the second outer partition support 36 are placed, and then the second outer electrostatic ring 332 is placed, and then the conductor of the second inner coil 31 is transitioned to the outer diameter side of the second coil assembly 3 to start winding the second outer coil 33. When the first pancake wire at the lower part of the second outer coil 33 is wound, the outlet wire of the second outer electrostatic ring 332 is welded to the single wire of the conductor; after welding, the second outer coil 33 is continued to be wound from the bottom to the top, and after the second outer coil 33 is wound, it is located on the previously placed ferrule assembly 4.

[0063] In step S2, after the prefabricated split coil wound in step S1 is hoisted out from the vertical winding machine, the upper part of the second coil assembly 3 is pressed with a conventional clamping device, and the first coil assembly 2 is subjected to the clamping force transmitted from the second coil assembly 3 from top to bottom, and then the prefabricated split coil and the clamping device are placed in a vacuum drying tank; in addition, insulating parts such as angle rings, struts and end rings that need to be assembled later are also placed in the vacuum drying tank. Then, the vacuum drying system is turned on to dry the prefabricated split coil and its subsequent installation components. After drying is completed, the prefabricated split coil and its subsequent installation components are removed from the vacuum drying tank.

[0064] In step S3, the second coil assembly 3 is pulled out from the prefabricated split coil, and then the second coil assembly 3 is pressurized by the clamping device, and the heights of the second inner coil 31 and the second outer coil 33 are measured; according to the height measurement results, the inner oil channel dimensions of the second inner coil 31 and the second outer coil 33 are adjusted so that their heights are within the design requirements, and finally the second outermost support stay 37 is installed so that it falls on the support pad 38 extending from the lower part of the second outer coil 33, and the outer side of the second outermost support stay 37 is tied and tightened with a polyester belt.

[0065] After pulling out the innermost base tube 1, remove the ring assembly 4, and lightly knock the first innermost support strut 24 downward to make it fall on the support end ring 5; use the clamping device to pressurize the first coil assembly 2, and measure the height of the first inner coil 21 and the first outer coil 23; according to the height measurement results, adjust the internal oil channel size of the first inner coil 21 and the first outer coil 23 so that their heights are within the design requirements, and finally install the first outermost support strut 27, and tie and tighten the outside of the first outermost support strut 27 with a polyester belt.

[0066] After the height adjustment of the first coil component 2 is completed, the innermost base tube 1 is re-embedded into the first coil component 2, and then the first inner angle ring 213 and the first outer angle ring 233 of the first coil component 2 are installed; secondly, the ring assembly 4 is placed on the first inner angle ring 213 and the first outer angle ring 233 of the first coil component 2; then the second coil component 3 is inserted into the innermost base tube 1 for a distance, and the second inner angle ring 313 and the second outer angle ring 333 of the second coil component 3 are installed; after the second inner angle ring 313 and the second outer angle ring 333 are placed, the second coil component 3 is continued to be inserted downward until it falls on the ring assembly 4; finally, the top oil baffle plate group 71, the top end ring group 72, the top sleeve plate group 73 and the top pad group 74 are placed on the upper part of the second coil component 3, thereby completing the winding of the axial split coil structure.

[0067] In order to prevent the innermost base tube 1 and other insulating parts from being exposed to moisture for too long after the coil is baked, which may cause the size of the insulating parts to change, the step S3 must be completed within 24 hours after the prefabricated split coil is baked.

[0068] The axial split coil structure is wound on a vertical winding machine; compared with winding on a horizontal winding machine, winding on a vertical winding machine is more conducive to the axial positioning of the axial split coil structure and facilitates the welding of the electrostatic ring wire and the wire.

[0069] After the first inner coil 21 is wound, the height of the first inner coil 21 will be higher than the design because it is not dried and pressed. If the first innermost support strut 24 is not long enough, the upper end surface of the wound first inner coil 21 may exceed the upper end of the first innermost support strut 24. However, if the overall length of the first innermost support strut 24 is set too long, it is easy to cause structural interference with the first inner angle ring 213. Therefore, before the first inner coil 21 is wound, the first innermost support strut 24 is raised upward by a certain distance so that the winding range of the first inner coil 21 is on the first innermost support strut 24 to prevent the upper end surface of the first inner coil 21 from exceeding the upper end of the first innermost support strut 24, thereby avoiding the situation where the first inner electrostatic ring 212 is stuck by the first innermost support strut 24 during the downward movement due to the eccentric pressure of the first inner coil 21 when the first inner coil 21 is dried and pressed. The lifted first innermost support strut 24 can be tightened and fixed by a thin tension band first, and then the thin tension band will be cut off after completing part of the coil. After the first inner layer coil 21 is dried and pressed, the first innermost support strut 24 will be lightly knocked downwards to make it fall on the support end ring 5.

[0070] The outgoing wires of each electrostatic ring are directly welded to the single element wire of the corresponding conductor; and there is no need to lead out the outgoing wires of the electrostatic ring.

[0071] The winding tooling 8 is used in the process of winding the first outer coil 23 from top to bottom and the process of winding the second inner coil 31 from top to bottom. The winding tooling 8 is fixed on the corresponding support bar, and the outer periphery of each tooling is tightened with a tightening belt 9 to support the upper coil.

[0072] like Figures 8 to 13 As shown, Figure 8 A front view of the structure of the winding tooling; Fig. 9 A top view of the structure of the winding tooling; Fig.10 A front view of the structure of using the winding tool to wind the first outer coil; Fig.11 A bottom view of the structure for winding the first outer coil using the winding tool; Fig.12 A front view of the structure for winding the second inner coil using the winding tool; Fig.13 This is a bottom view of the structure for winding the second inner coil using the winding tool.

[0073] Specifically, the winding tool 8 includes a connecting plate 81 and a supporting plate 82, wherein the supporting plate 82 is vertically fixed to one end of the connecting plate 81 to form an L-shaped structure, and a clamping groove 83 is provided on one side of the connecting plate 81 away from the supporting plate 82, and the extending direction of the clamping groove 83 is consistent with the extending direction of the connecting plate 81, and the corresponding first outer partitioning strut 26 or the second innermost supporting strut 34 is arranged in the clamping groove 83 to realize the fixing of the winding tool 8 at the corresponding position. The upper end surface of the supporting plate 82 is horizontally arranged to support the upper coil, and the tightening belt 9 is sleeved on the connecting plates 81 of the plurality of winding tools 8 arranged in an annular manner to realize the position fixing of the plurality of winding tools 8.

[0074] After the second coil assembly 3 is dried, the height of the second inner coil 31 and the second outer coil 33 are compressed, measured and adjusted by pulling out the innermost base tube 1 from the innermost side, thereby ensuring that the coil height is within the design requirement.

[0075] After the first coil assembly 2 is dried, the height of the first inner coil 21 and the first outer coil 23 are compressed, measured and adjusted by pulling out the innermost base tube 1 from the innermost side, thereby ensuring that the coil height is within the design requirement.

[0076] The first inner corner ring 213 and the first outer corner ring 233 of the first coil assembly 2 are not installed in step S1, but are installed after the heights of the first inner coil 21 and the first outer coil 23 are adjusted, thereby preventing the first inner corner ring 213 from being stabbed by the first innermost supporting bar 24 during the drying process and from being damaged during the removal of the innermost base tube 1.

[0077] The second inner corner ring 313 and the second outer corner ring 333 of the second coil assembly 3 are not installed in step S1, but are installed after the height of the second inner coil 31 and the second outer coil 33 are adjusted, thereby preventing the second inner corner ring 313 from being stabbed by the second innermost supporting bar 34 during the drying process and being damaged during the removal of the innermost base tube 1.

[0078] In order to prevent the insulating parts such as the innermost base tube 1 from being exposed to moisture for too long after the coil is baked, which may cause the size of the insulating parts to change, making it difficult to re-embed the innermost base tube 1 and affecting the measurement results such as the coil height, step S3 must be completed within twenty-four hours after the coil is baked.

[0079] The above is only a preferred embodiment of the utility model, which is only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences can be made within the spirit and scope defined by the claims of the utility model, but they will all fall within the scope of protection of the utility model.

Claims

1. An axially split coil structure, characterized in that: It includes an innermost basic tube, a first coil assembly and a second coil assembly, wherein the first coil assembly is sleeved on the lower part of the innermost basic tube, and the second coil assembly is sleeved on the upper part of the innermost basic tube, and the first coil assembly and the second coil assembly are axially distributed in an upper and lower direction, and a collar assembly is arranged between the first coil assembly and the second coil assembly, and a bottom oil baffle plate group, a bottom end ring group, a bottom pad group and a bottom sleeve plate group are arranged at the lower part of the first coil assembly, and the bottom sleeve plate group, the bottom pad group, the bottom end ring group and the bottom oil baffle plate group are arranged in sequence from bottom to top on the supporting end ring, and the lower part of the second coil assembly is supported by the collar assembly, and a top oil baffle plate group, a top end ring group, a top sleeve plate group and a top pad group are arranged in sequence from bottom to top on the upper part of the second coil assembly.

2. The axially split coil structure according to claim 1, characterized in that: The first coil assembly includes a first inner coil, a first insulating cylinder and a first outer coil arranged in sequence from the inside to the outside, a first innermost supporting strut is arranged between the first inner coil and the innermost base cylinder, a first inner separating strut is arranged between the first inner coil and the first insulating cylinder, a first outer separating strut is arranged between the first insulating cylinder and the first outer coil, and a first outermost supporting strut is arranged outside the first outer coil; The second coil assembly includes a second inner coil, a second insulating tube and a second outer coil, which are arranged in sequence from the inside to the outside. A second innermost support strut is arranged between the second inner coil and the innermost base tube, a second inner partition strut is arranged between the second inner coil and the second insulating tube, a second outer partition strut is arranged between the second insulating tube and the second outer coil, a second outermost support strut is arranged on the outside of the second outer coil, and a support pad is arranged at the bottom of the second outer coil.

3. The axially split coil structure according to claim 2, characterized in that: A first inner sleeve plate, a first inner electrostatic ring and a first inner angle ring are arranged on the inner diameter side above the first inner coil, the first inner electrostatic ring is arranged between the first inner angle ring and the first inner coil, the first inner sleeve plate is arranged between the first inner electrostatic ring and the first inner angle ring, and between the first inner electrostatic ring and the first inner coil, a first outer sleeve plate, a first outer electrostatic ring and a first outer angle ring are arranged on the outer diameter side above the first outer coil, the first outer electrostatic ring is arranged between the first outer angle ring and the first outer coil, the first outer sleeve plate is arranged between the first outer electrostatic ring and the first outer angle ring, and between the first outer electrostatic ring and the first outer coil.

4. The axially split coil structure according to claim 2, characterized in that: A second inner sleeve plate, a second inner electrostatic ring and a second inner angle ring are arranged on the inner diameter side below the second inner coil, the second inner electrostatic ring is arranged between the second inner angle ring and the second inner coil, the second inner sleeve plate is arranged between the second inner electrostatic ring and the second inner angle ring, and between the second inner electrostatic ring and the second inner coil, a second outer sleeve plate, a second outer electrostatic ring and a second outer angle ring are arranged on the outer diameter side below the second outer coil, the second outer electrostatic ring is arranged between the second outer angle ring and the second outer coil, the second outer sleeve plate is arranged between the second outer electrostatic ring and the second outer angle ring, and between the second outer electrostatic ring and the second outer coil.

5. The axially split coil structure according to claim 2, characterized in that: The ferrule assembly includes a septum gasket block group and a septum sleeve plate group, and the septum gasket block group is arranged between the septum sleeve plate group and the first coil assembly and the second coil assembly.

6. The axially split coil structure according to claim 5, characterized in that: The middle spacer block group includes a first lower block, a second lower block and an upper block, the first lower block and the second lower block are arranged at the bottom of the middle spacer sleeve group, the first lower block and the second lower block correspond to the first inner coil and the first outer coil respectively, and the upper block is arranged at the top of the middle spacer sleeve group.

7. The axially split coil structure according to claim 2, characterized in that: The first inner coil and the first outer coil are both spiral structures and are connected by transition transposition at the top of the first coil assembly to form a ∩-shaped coil structure; the second inner coil and the second outer coil are spiral structures and are connected by transition transposition at the bottom of the second coil assembly to form a U-shaped coil structure; the first coil assembly and the second coil assembly are both provided with a strong oil-guided cooling structure.

8. The axially split coil structure according to claim 2, characterized in that: The bottom oil baffle plate group includes a bottom inner oil baffle plate and a bottom outer oil baffle plate, the bottom inner oil baffle plate is correspondingly arranged below the first inner coil, the bottom outer oil baffle plate is correspondingly arranged below the first outer coil, and the bottom inner oil baffle plate and the bottom outer oil baffle plate are separated by the first insulating tube; the bottom end ring group includes a bottom inner end ring and a bottom outer end ring, the bottom inner end ring and the bottom inner oil baffle plate are correspondingly arranged, and the bottom outer end ring and the bottom outer oil baffle plate are correspondingly arranged.

9. The axially split coil structure according to claim 2, characterized in that: The top oil baffle plate group includes a top inner oil baffle plate and a top outer oil baffle plate, the top end ring group includes a top inner end ring and a top outer end ring, the top sleeve plate group includes a top inner sleeve plate and a top outer sleeve plate, the top gasket block group includes a top inner gasket block and a top outer gasket block, the top inner oil baffle plate, the top inner end ring, the top inner sleeve plate and the top inner gasket block are correspondingly arranged above the second inner coil, and the top outer oil baffle plate, the top outer end ring, the top outer sleeve plate and the top outer gasket block are correspondingly arranged above the second outer coil.

10. A transformer, characterized in that: It includes a winding part, which is sleeved on an iron core in an oil tank. The winding assembly includes a low-voltage winding and a high-voltage winding. The low-voltage winding and the high-voltage winding are arranged correspondingly. The low-voltage winding adopts an axial split coil structure as described in any one of claims 1-9.

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