Oil-immersed series reactor with low loss and high short-circuit resistance

Abstract

The present application relates to the technical field of electric reactors, and particularly relates to a low-loss high short-circuit resistance oil-immersed series reactor, which comprises a core assembly, a coil assembly and a shell. The core column of the core assembly is stacked by circular radial pie, the radial pie contains a radial iron sheet assembly and is poured with resin; the coil assembly comprises inner and outer coil spiral windings, which are coupled and supported by dovetail support blocks and corresponding support bars; the core insulation cylinder contains a shielding cylinder, and the shell inner wall is attached with a grounded box shielding layer. The present application optimizes the magnetic circuit, strengthens the winding support, shields the magnetic leakage and optimizes the heat dissipation, effectively reduces the loss and noise, improves the short-circuit resistance and operation stability, reduces the operation and maintenance cost, and adapts to the demand of high-voltage power grid.

Description

Technical Field

[0001] This invention relates to the field of reactor technology, specifically to an oil-immersed series reactor with low loss and high short-circuit withstand capability. Background Technology

[0002] As a key voltage stabilizer and harmonic control device in high-voltage power grids, the performance of series reactors directly affects the stability and energy efficiency of the grid. However, existing oil-immersed series reactors generally suffer from many technical defects: the core often uses conventional silicon steel sheets and traditional magnetic circuit structures, the selection of winding conductor materials and structural design are unreasonable, and the oil tank lacks effective leakage magnetic shielding measures, resulting in high overall equipment losses and susceptibility to additional losses and local overheating due to leakage magnetic field; the winding support structure is weak, and there is a lack of reliable support and positioning between the core and the winding. The electrodynamic force generated by the short-circuit current can easily cause the coil to loosen, rotate, shift between phases, or even deform and be damaged, resulting in insufficient short-circuit withstand capability; the core has a large hysteresis expansion and contraction, and vibration and noise are prone to exceed the standard. At the same time, the heat dissipation structure design is not perfect, resulting in excessive temperature rise of the core and winding, accelerating insulation aging and shortening the service life of the equipment; sharp-angle discharge is prone to occur between the high-voltage coil and the core, there is no reliable mechanical connection between the reactor body and the oil tank, and parts are prone to loosening during transportation. On-site installation also requires core lifting and debugging, resulting in poor equipment insulation performance and operational stability, and high operation and maintenance costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a low-loss, high-short-circuit-resistance oil-immersed series reactor, specifically achieved through the following technical solution:

[0004] A low-loss, high-short-circuit-resistance oil-immersed series reactor includes a core assembly. The core column of the core assembly is formed by stacking several circular spokes from bottom to top. Each spoke has a circular hole in its center, and several first pads are placed between adjacent spokes. A coil assembly is mounted on the core column. The coil assembly consists of a core insulating cylinder, an inner winding, an outer winding, and a second paper tube, arranged sequentially from the inside out. Both the inner and outer windings are composed of several layers of spiral coil structures stacked sequentially from top to bottom. Adjacent spiral coil structures are electrically connected. The two adjacent spiral coils of the inner winding are connected... A second dovetail support block is installed between each of the structures. One end of the second dovetail support block is coupled to the fourth support bar, and the other end is coupled to the third support bar. The side of the fourth support bar away from the second dovetail support block abuts against the iron core insulating cylinder, and the side of the third support bar away from the second dovetail support block abuts against the first paper tube. A first dovetail support block is installed between each of the two adjacent spiral coil structures of the outer winding. One end of the first dovetail support block is coupled to the second support bar, and the other end is coupled to the first support bar. The side of the second support bar away from the first dovetail support block abuts against the first paper tube, and the side of the first support bar away from the first dovetail support block abuts against the second paper tube.

[0005] The iron core insulating cylinder includes a third paper cylinder located in the inner ring and a fourth paper cylinder located in the outer ring. The inner wall of the fourth paper cylinder is tightly connected to the outer wall of the cable paper cylinder, and a shielding cylinder is installed between the cable paper cylinder and the third paper cylinder.

[0006] The shielding cylinder is composed of several annular shielding strips stacked from top to bottom. Each shielding strip includes a U-shaped paper tube with an aluminum strip inside. The opening of the paper tube faces the third paper tube.

[0007] A fifth support bar is installed between the third paper tube and the shielding tube, as well as between the shielding tube and the cable paper tube.

[0008] A sixth support bar is installed between the third paper tube and the core column.

[0009] The disc comprises several radially arranged, closely spaced iron sheet components cast in resin.

[0010] The core assembly includes a core and a clamping device. The core includes an upper horizontal section, a lower horizontal section, and three core posts installed between the upper and lower horizontal sections. The clamping device also includes a lower clamp that engages with the lower horizontal section and an upper clamp that engages with the upper horizontal section. The lower clamp and the upper clamp are fastened by a pull rod.

[0011] The iron core assembly is installed inside the housing, and the inner wall of the housing is equipped with a box shielding layer.

[0012] The enclosure shielding layer includes several sets of clips fixed to the inner wall of the enclosure, and a shielding plate is installed between two adjacent sets of clips. Each shielding plate is grounded.

[0013] The core assembly is equipped with an elastic element to dampen the coil assembly.

[0014] The technical solution of this invention has the following advantages:

[0015] The oil-immersed series reactor with low loss and high short-circuit withstand capability provided by this invention effectively overcomes the pain points of high loss, insufficient short-circuit withstand capability and poor operation stability in the prior art through the coordinated optimization design of key parts such as core assembly, winding structure, insulation shield and shell, and achieves the comprehensive technical effect of low loss, high short-circuit withstand performance and long-term stable operation.

[0016] The core column adopts a structure with circular spokes stacked from bottom to top and a first pad between adjacent spokes. Combined with the design where the spokes are made of radially closely arranged iron sheet components cast in resin, this not only optimizes the magnetic circuit distribution to reduce core unit loss but also suppresses core vibration to reduce noise, while simultaneously creating unobstructed oil channels for heat dissipation. Both the inner and outer windings employ a helical coil structure. Through the coupling support of the first and second dovetail supports with their corresponding support bars, a stable winding support system is constructed, significantly improving the winding's ability to withstand short-circuit electrodynamic forces, preventing coil loosening, deformation, or displacement, and facilitating full contact of the cooling oil with the winding for efficient heat dissipation. The iron core insulation cylinder consists of a third paper cylinder, a fourth paper cylinder, and a shielding cylinder. The shielding cylinder is made of stacked U-shaped paper cylinders covered with aluminum bars, which not only blocks the electric field concentration between the high-voltage coil and the iron core, avoiding sharp-angle discharge, but also effectively shields leakage magnetic field to reduce additional losses. The box shielding layer installed on the inner wall of the shell absorbs leakage magnetic field through a grounded shielding plate, further reducing leakage magnetic field loss and local overheating. The clamping fixture of the iron core assembly, through the tight cooperation of the lower clamp, upper clamp, and pull rod, makes the iron core form a stable whole, improving the reliability of the equipment during short-circuit impact and transportation. The overall structural design also reduces the difficulty and cost of operation and maintenance, and enhances the adaptability to outdoor operation. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the installation structure of the coil assembly;

[0020] Figure 3 A schematic diagram of the installation structure of the enclosure's shielding layer;

[0021] Figure 4 for Figure 1 Schematic diagram of the structure at point B;

[0022] Figure 5 This is a schematic diagram of the structure of a disc;

[0023] Figure 6 This is a schematic diagram of the iron sheet assembly.

[0024] Figure 7 for Figure 2 Schematic diagram of the structure at point C;

[0025] Figure 8 This is a schematic diagram of the structure of an iron core insulating cylinder;

[0026] Figure 9 This is a partial cross-sectional view of the iron core insulating cylinder.

[0027] Figure 10 This is a schematic diagram of the outer winding structure;

[0028] Figure 11 This is a schematic diagram of the inner winding structure;

[0029] Figure 12 for Figure 1 A schematic diagram of the structure at point A in the middle.

[0030] In the diagram, 1-shell, 2-iron core, 3-lower clamp, 4-pull rod, 5-box shielding layer, 6-core column, 7-upper clamp, 8-insulating sleeve, 9-coil assembly, 10-positioning plate, 11-clamp, 12-shielding plate, 13-spoke, 14-first pad, 15-radial oil passage, 16-iron sheet assembly, 17-iron sheet, 18-iron core insulating cylinder, 19-gas relay horizontal tube, 20-inner winding, 21-first paper tube, 22-... - Outer winding, 23- Second paper tube, 24- First dovetail support block, 25- First support bar, 26- Second support bar, 27- Third support bar, 28- Second dovetail support block, 29- Fourth support bar, 30- Terminal block, 31- Brush wire, 32- Crepe paper, 33- Copper busbar, 34- Shielding strip, 35- Third paper tube, 36- Fourth paper tube, 37- Covered paper tube, 38- Aluminum busbar, 39- Fixing nut, 40- Spring telescopic column, 41- Top plate. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the module or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] As attached Figure 1 and attached Figure 2 As shown, the present invention provides an oil-immersed series reactor with low loss and high short-circuit withstand capability, including a housing 1 and an iron core assembly installed in the housing 1, the iron core assembly being grounded.

[0036] Positioning plates 10 are fixedly installed on both sides of the bottom of the housing 1, and the positioning plates 10 install the housing 1 on the work station.

[0037] The core assembly includes a core 2 and a clamping fixture. The core 2 includes an upper horizontal section, a lower horizontal section, and three core posts 6 installed between the upper and lower horizontal sections. The clamping fixture includes a lower clamp 3, a pull rod 4, and an upper clamp 7. The lower clamp 3 and the upper clamp 7 have the same structure and are both U-shaped. The upper clamp 7 is fastened to the upper horizontal section, and the lower clamp 3 is fastened to the lower horizontal section from the bottom. The pull rod 4 passes through the lower clamp 3 and the upper clamp 7 and is equipped with nuts at both ends. Tightening the nuts tightens the lower clamp 3 and the upper clamp 7, so that the core 2 and the clamping fixture form a structurally stable core assembly.

[0038] A base is installed at the bottom of the lower clamp 3, and the length direction of the base is the same as the width direction of the housing 1; the base sits on the bottom wall of the housing 1. The base and the housing 1 can be fixed together by positioning bolts, studs, etc.

[0039] A coil assembly 9 is mounted on the core post 6, and the coil assembly 9 is connected to an insulating sleeve 8 mounted on the top of the housing via wires.

[0040] An elastic element is provided between the coil assembly 9 and the upper clamp 7 to buffer the impact force generated by the short-circuit current, prevent the coil from loosening, rotating or shifting between phases, and further improve the short-circuit resistance.

[0041] As attached Figure 12 As shown, the elastic element includes a fixing nut 39 fixed to the upper clamp 7, and a spring telescopic column 40 is bolted to the fixing nut 39. A top plate 41 that abuts against the coil assembly 9 is mounted on the piston of the spring telescopic column 40.

[0042] In this embodiment, the elastic element can also be a disc spring, with one end of the disc spring abutting against the upper clamp 7 and the other end abutting against the coil assembly 9.

[0043] The inner walls of the casing 1, namely the bottom wall and the four side walls, are all fitted with enclosure shielding layers 5. The installation method of the enclosure shielding layers 5 is shown in the attached figure. Figure 3 As shown, the housing includes several sets of clips 11 fixed to the inner wall of the housing 1, with a shielding plate 12 installed between adjacent sets of clips 11. The shielding plates 12 cover the inner wall of the housing 1. Each shielding plate 12 is grounded.

[0044] The shell 1 is made of high-strength steel plate, which meets the requirements of vacuum and positive pressure mechanical strength test, and is free from damage and permanent deformation; the inner wall is covered with box shielding layer 5, which effectively absorbs leakage magnetic flux generated by the winding, reduces leakage magnetic flux loss, and avoids local overheating of the shell 1;

[0045] All sealing surfaces of housing 1 adopt a multi-layer sealing structure, and no leakage was found after static pressure testing, ensuring the sealing reliability of the oil-immersed equipment; butterfly valves are installed at both ends of the gas relay horizontal pipe 19 of housing 1, which facilitates observation and gas sampling during operation.

[0046] The structure of core 6 is shown in the attached figure. Figure 1 and attached Figure 4 As shown, it is composed of several circular spokes 13 stacked from bottom to top, with a circular hole in the middle of each spoke 13; the circular holes of all the spokes 13 that make up the core column 6 together form an axial oil passage.

[0047] Several first pads 14 are placed between two adjacent spokes 13. These first pads 14 are arranged in a circumferential array, and a radial oil passage 15 is formed between two adjacent first pads 14.

[0048] Core 6 is designed to be circular to optimize the magnetic field distribution.

[0049] Core 2 is made of cold-rolled high-permeability grain-oriented silicon steel sheet with low hysteresis expansion and contraction, and the magnetic flux density is controlled to be far below the saturation point, thereby reducing the unit loss of the core from the material level.

[0050] The first pad 14 is made of marble, is insulated, and has no compression.

[0051] The structure of disc 13 is shown in the attached figure. Figure 5 As shown, it consists of several radially arranged iron sheet components 16.

[0052] In this embodiment, the structure of the iron sheet assembly 16 is as shown in the attached figure. Figure 6 As shown, it includes seventeen iron plates 17, the length of which decreases sequentially in a counterclockwise direction.

[0053] In two adjacent sheet assemblies 16, the first ends of all the sheets 17 in the first sheet assembly 16 abut against the longest sheet 17 in the second sheet assembly 16.

[0054] After the spokes 13 are assembled, they are placed in a vacuum furnace, vacuumed, and then resin is poured. After the resin solidifies, they form a whole, which can optimize the magnetic circuit direction, further reduce the unit loss of the iron core, suppress the vibration of the iron core, and reduce noise sources.

[0055] As attached Figure 2 and attached Figure 7 As shown, the core post 6 is equipped with an iron core insulating cylinder 18, an inner winding 20, an outer winding 22, and a second paper tube 23, which are installed sequentially from the inside out.

[0056] The structure of the iron core insulating cylinder 18 is shown in the attached figure. Figure 8 and attached Figure 9 As shown, it includes a third paper tube 35 located in the inner ring and a fourth paper tube 36 located in the outer ring, with the inner wall of the fourth paper tube 36 tightly bonded to the outer wall of the cable paper tube.

[0057] A shielding tube is installed between the cable paper tube and the third paper tube 35. The shielding tube is composed of several annular shielding strips 34 stacked from top to bottom. The shielding strip 34 includes a U-shaped covering paper tube 37, and an aluminum strip 38 is wrapped inside the covering paper tube 37. The opening of the covering paper tube 37 faces the third paper tube 35.

[0058] A fifth support bar (not shown) is installed between the third paper tube 35 and the shielding tube, as well as between the shielding tube and the cable paper tube, to maintain the structural stability of the iron core insulation tube 18; it also allows the cooling oil to fully contact the aluminum busbar 38.

[0059] A sixth support bar (not shown) is installed between the third paper tube 35 and the core post 6. This structure can maintain the stability of the position of the iron core insulating tube 18 and allow each of the spokes 13 of the core post 6 to be immersed in the heat dissipation oil, so that the heat of the iron core 2 can be evenly distributed and the temperature rise of the iron core 2 can be effectively reduced.

[0060] The iron core 2 and all metal components are coated with an anti-corrosion protective layer and reliably grounded, improving their adaptability to outdoor operation.

[0061] The 18-inch iron core insulating cylinder blocks the electric field concentration between the high-voltage coil and the iron core, completely avoiding sharp-angle discharge phenomena.

[0062] As attached Figure 8 and attached Figure 9 As shown, all aluminum busbars 38 are electrically connected to vertical copper busbars 33. Specifically, both ends of the aluminum busbars 38 are fixed to the copper busbars 33, and the parts of the copper busbars 33 that do not contact the aluminum busbars 38 are covered with crepe paper 32. The top of the copper busbars 33 is connected to the terminal block 30 through the brush wire 31. The terminal block 30 is used for grounding.

[0063] The structure of the inner winding 20 is shown in the attached figure. Figure 11 As shown in the attached diagram, the structure of the outer winding 22 is as follows. Figure 10 As shown, each structure consists of several layers of spiral coils stacked sequentially from top to bottom, with adjacent spiral coil structures electrically connected.

[0064] As attached Figure 7 As shown, a second dovetail support block 28 is installed between each of the two adjacent helical coil structures of the inner winding 20. One end of the second dovetail support block 28 is coupled to the fourth support bar 29, and the other end is coupled to the third support bar 27. The side of the fourth support bar 29 away from the second dovetail support block 28 abuts against the iron core insulating cylinder 18, and the side of the third support bar 27 away from the second dovetail support block 28 abuts against the first paper tube 21. This structure ensures that each spoke 13 of the core post 6 and each helical coil structure of the inner winding 20 can be immersed in cooling oil.

[0065] A first dovetail support block 24 is installed between two adjacent spiral coil structures of the outer winding 22. One end of the first dovetail support block 24 is coupled to the second support bar 26, and the other end is coupled to the first support bar 25.

[0066] The side of the second support bar 26 away from the first dovetail support block 24 abuts against the first paper tube 21, and the side of the first support bar 25 away from the first dovetail support block 24 abuts against the second paper tube 23. This structure allows each helical coil structure of the outer winding 22 to be completely immersed in the cooling oil.

[0067] Both the inner winding 20 and the outer winding 22 are single-helix coils, with the inner winding 20 winding to the right and the outer winding 22 winding to the left; the inner winding 20 and the outer winding 22 are connected end to end.

[0068] The inner winding 20 and the outer winding 22 are made of high-quality self-adhesive enameled round wire from the same manufacturer and batch. The wire has a layer of self-adhesive varnish on the outside of the ordinary enameled layer, which increases the electrical strength by more than 200% and the mechanical strength by 100% compared with conventional wires. After high temperature curing, the wires and the insulation material form an integrated structure, which greatly improves the resistance to short circuit impact.

[0069] The interlayer insulation grid of the inner winding 20 and the outer winding 22 adopts an adhesive paper design, and the dovetail support block of the conductor and the interlayer insulation oil channel is cured into one piece at high temperature to avoid winding deformation caused by short circuit electrodynamics.

[0070] In this embodiment, there are twelve of each of the second support bar 26 and the fourth support bar 29.

[0071] This invention achieves a comprehensive technical effect of low loss, high short-circuit resistance, and stable operation through a series of targeted technical designs. The core 2 is made of cold-rolled high-permeability grain-oriented silicon steel sheets with low hysteresis and the magnetic flux density is controlled to be far below the saturation point. Combined with the radially arranged iron sheet assembly 16 of the radial disc 13, which is formed by vacuum casting resin, the core not only significantly reduces the unit loss of the core from the perspective of material and magnetic circuit optimization, but also effectively suppresses core vibration and reduces noise sources. At the same time, the clamping fixture, through the tight fit of the lower clamp 3, the upper clamp 7 and the pull rod 4, makes the core assembly a stable whole, which improves the deformation resistance of the core 2 under short-circuit impact. The core column 6 adopts a stacked design of circular spokes 13, which, together with the first marble pad 14 arranged in a circular array between adjacent spokes 13, not only optimizes the magnetic field distribution, but also forms a smooth radial oil channel 15. The circular holes in the middle of the spokes 13 together form an axial oil channel. The dual oil channel design ensures that the heat dissipation oil can flow fully through the core column 6, realize the uniform diffusion of heat in the iron core 2, and reduce the temperature rise of the iron core 2. The inner winding 20 and the outer winding 22 use the same batch of high-quality self-adhesive enameled round wire. The self-adhesive coating on the outer layer increases the electrical strength by more than 200% and the mechanical strength by 100% compared to conventional wires. After high-temperature curing, the wires and the insulation material form an integrated structure. Combined with the single-helix right-hand and left-hand winding connection method and the adhesive paper design of the interlayer insulation grid, along with the coupling support of the second dovetail support block 28, the fourth support bar 29 and the third support bar 27, and the first dovetail support block 24, the second support bar 26 and the first support bar 25, not only can the spiral coil structure of the inner winding 20 and the outer winding 22 be completely immersed in the heat dissipation oil, ensuring efficient heat dissipation of the winding, but also significantly improve the overall structural strength of the winding, effectively resisting the electrodynamic force generated by the short-circuit current and preventing coil loosening, rotation, phase displacement and deformation damage. The iron core insulating cylinder 18 has a double-layer structure consisting of a third paper cylinder 35 and a fourth paper cylinder 36, combined with a shielding cylinder composed of a shielding strip 34 in the middle. The shielding strip 34 adopts a U-shaped design that wraps the paper cylinder 37 around the aluminum busbar 38 and the opening faces the third paper cylinder 35. This design not only blocks the electric field concentration between the high-voltage coil and the iron core, completely avoiding the sharp-angle discharge phenomenon, but also achieves effective shielding of leakage magnetic field through the electrical connection between the aluminum busbar 38 and the grounded copper busbar 33, reducing leakage magnetic field loss. At the same time, the fifth support strip between the third paper cylinder 35 and the shielding cylinder, the shielding cylinder and the cable paper cylinder, and the sixth support strip between the third paper cylinder 35 and the core column 6 not only ensure the structural stability of the iron core insulating cylinder 18, but also ensure that the heat dissipation oil is in full contact with the aluminum busbar 38 and the core column 6, further improving the heat dissipation effect.The housing 1 is made of high-strength steel plate and undergoes multi-layer sealing treatment. Combined with the shielding layer 5 of the enclosure, which consists of shielding plates 12 fixed to the inner wall by clips 11 and fully grounded, it effectively absorbs leakage magnetic flux generated by the windings, preventing localized overheating and leakage magnetic loss in the oil tank. Simultaneously, it meets the mechanical strength requirements for vacuum and positive pressure, without damage or permanent deformation. The sealing surface has undergone static pressure testing with no leakage, ensuring the sealing reliability of the oil-immersed equipment. The butterfly valve design at both ends of the gas relay's horizontal pipe also facilitates observation and gas sampling during operation, reducing maintenance costs. Furthermore, the anti-corrosion protective layer coated on the iron core 2 and all metal components enhances the equipment's adaptability to outdoor operation. The overall structural design ensures a reliable mechanical connection between the device body and the oil tank, preventing loosening of parts during transportation and eliminating the need for on-site core lifting and debugging, further reducing maintenance difficulty and costs.

[0072] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An oil-immersed series reactor with low loss and high short-circuit resistance, characterized by, The application relates to a core assembly, a coil assembly and a shell.

2. The low-loss high short-circuit resistance oil-immersed series reactor according to claim 1, characterized by, The core assembly comprises core columns (6), the core columns (6) are stacked from bottom to top by a plurality of circular radial cakes (13), the middle part of the radial cakes (13) is provided with a circular hole, and a plurality of first supporting blocks (14) are arranged between two adjacent radial cakes (13); the core column (6) is provided with a coil assembly (9), the coil assembly (9) is sequentially provided with a core insulation cylinder (18), an inner coil winding (20), an outer coil winding (22) and a second paper cylinder (23) from inside to outside, the inner coil winding (20) and the outer coil winding (22) are both composed of a plurality of layers of spiral coil structures which are stacked from top to bottom, two adjacent spiral coil structures are electrically connected, a second dovetail supporting block (28) is arranged between two adjacent spiral coil structures of the inner coil winding (20), one end of the second dovetail supporting block (28) is coupled with a fourth supporting strip (29), and the other end is coupled with a third supporting strip (27), the fourth supporting strip (29) is in abutment with the core insulation cylinder (18) on the side far away from the second dovetail supporting block (28), the third supporting strip (27) is in abutment with a first paper cylinder (21) on the side far away from the second dovetail supporting block (28), a first dovetail supporting block (24) is arranged between two adjacent spiral coil structures of the outer coil winding (22), one end of the first dovetail supporting block (24) is coupled with a second supporting strip (26), and the other end is coupled with a first supporting strip (25); the second supporting strip (26) is in abutment with the first paper cylinder (21) on the side far away from the first dovetail supporting block (24), and the first supporting strip (25) is in abutment with the second paper cylinder (23) on the side far away from the first dovetail supporting block (24).

3. The low-loss high short-circuit resistant oil-immersed series reactor according to claim 2, characterized by The core insulation cylinder (18) comprises a third paper cylinder (35) located at the inner coil and a fourth paper cylinder (36) located at the outer coil, the inner wall of the fourth paper cylinder (36) is tightly combined with the outer wall of a cable paper cylinder, and a shielding cylinder is arranged between the cable paper cylinder and the third paper cylinder (35).

4. The low-loss high short-circuit resistant oil-immersed series reactor according to claim 3, characterized by The shielding cylinder is composed of a plurality of annular shielding strips (34) which are stacked from top to bottom, the shielding strip (34) comprises a U-shaped covering paper cylinder (37), and the covering paper cylinder (37) covers an aluminum row (38); the opening of the covering paper cylinder (37) faces the third paper cylinder (35).

5. The low-loss high short-circuit resistant oil-immersed series reactor according to claim 3, characterized by Fifth supporting strips are arranged between the third paper cylinder (35) and the shielding cylinder and between the shielding cylinder and the cable paper cylinder.

6. The low-loss high short-circuit resistance oil-immersed series reactor according to claim 1, characterized by Sixth supporting strips are arranged between the third paper cylinder (35) and the core column (6).

7. The low-loss high short-circuit resistant oil-immersed series reactor according to claim 1, characterized by The radial cake (13) comprises a plurality of iron sheet assemblies (16) which are arranged in a radial mode and are tightly arranged in resin.

8. The low-loss high short-circuit resistant oil-immersed series reactor according to claim 1, characterized by The core assembly comprises a core (2) and a clamping device, the core (2) comprises an upper horizontal part, a lower horizontal part and three core columns (6) arranged between the upper horizontal part and the lower horizontal part, the clamping device comprises a lower clamp (3) buckled on the lower horizontal part and an upper clamp (7) buckled on the upper horizontal part, and the lower clamp (3) and the upper clamp (7) are fastened by a pull rod (4). The core assembly is arranged in a shell (1), and a box shielding layer (5) is arranged on the inner wall of the shell (1).

9. The low-loss high short-circuit resistant oil-immersed series reactor according to claim 8, characterized by The box shielding layer (5) comprises several groups of clamps (11) fixed on the inner wall of the shell (1), and a shielding plate (12) is installed between two adjacent groups of clamps (11), and each shielding plate (12) is grounded.

10. The low-loss high short-circuit resistant oil-immersed series reactor according to claim 1, characterized by The iron core assembly is provided with elastic elements for damping the coil assembly (9).

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