An extra-high voltage oil-immersed shunt core reactor and method

Abstract

This invention discloses an ultra-high voltage oil-immersed parallel core reactor and its method, belonging to the field of reactor technology. The reactor's yoke frame has a core structure between the upper and lower yokes. The core structure includes a core column, each comprising multiple first core discs stacked axially. Two second core discs are stacked axially at each end of the core column. Air gaps are provided between adjacent first core discs, between first and second core discs, between adjacent second core discs, and between the second core disc and the yoke frame. The height of the air gaps between adjacent second core discs and between the second core disc and the yoke frame is less than the height of the air gaps between adjacent first core discs and between the first and second core discs. The height of the second core disc is greater than the height of the first core disc. This effectively reduces reactor noise and solves the problem of high noise in oil-immersed parallel core reactors.

Description

Technical Field

[0001] This invention relates to the field of parallel core reactor technology, and in particular to an ultra-high voltage oil-immersed parallel core reactor and method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Oil-immersed parallel core reactors are mainly used in transmission lines to suppress power frequency overvoltage, balance reactive power, and improve system stability.

[0004] In related technologies, the core column and the air gap between the core column and the yoke of the oil-immersed parallel core reactor are equal and relatively large, which results in a weak ability to collect and conduct leakage flux at the coil end, leading to higher noise in the parallel core reactor. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes an ultra-high voltage oil-immersed parallel core reactor and method. By reducing the air gap between the second core cakes and increasing the stacking thickness of the yoke, the noise of the reactor is effectively reduced.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention proposes an ultra-high voltage oil-immersed parallel iron core reactor, comprising: an iron yoke frame, an iron core structure disposed between the upper iron yoke and the lower iron yoke of the iron yoke frame; clamps disposed on the front and rear sides of the iron yoke frame respectively, and the two clamps being connected to the iron yoke frame.

[0008] The core structure includes a core column, which includes multiple first core discs stacked along the axial direction; two stacked second core discs are arranged between the upper end of the core column and the upper yoke, and two more stacked second core discs are arranged between the lower end of the core column and the lower yoke; air gaps are provided between two adjacent first core discs, between a first core disc and a second core disc, between two adjacent second core discs, and between a second core disc and the yoke frame;

[0009] The air gap height between two adjacent second iron core discs and between the second iron core disc and the iron yoke frame is smaller than the air gap height between two adjacent first iron core discs and between the first iron core disc and the second iron core disc;

[0010] The height of the second iron core disc is greater than the height of the first iron core disc.

[0011] Furthermore, multiple spacers are placed between two adjacent first core discs and between the first core disc and the second core disc to form air gaps; 55%-65% of the area of ​​each first core disc is covered by spacers.

[0012] Multiple insulating blocks are set between two adjacent second core discs and between the second core disc and the yoke frame to form an air gap; the number of insulating blocks in each layer is a multiple of the number of pads in each layer.

[0013] Furthermore, the clamps and the yoke frame are fixed together by screws and straps; the two clamps are also connected by a connecting beam.

[0014] Furthermore, the connecting beam includes two crossbeams, a pressure beam, and a pad. One crossbeam connects the upper middle position of the two clamps, and the other crossbeam connects the lower middle position of the two clamps. The pressure beam connects the upper two ends of the two clamps, and the pad connects the lower two ends of the two clamps.

[0015] The iron core structure has an axial through-channel; the axial tie rod passes through the upper iron yoke of the iron yoke frame and the through-channel of the iron core structure and is connected to the crossbeam connecting the lower part of the two clamps.

[0016] Furthermore, the yoke frame includes an upper yoke, a lower yoke, a left yoke, and a right yoke; the upper and lower yokes are arranged opposite each other; the upper and lower ends of the left yoke are connected to the upper and lower yokes respectively; the two ends of the right yoke are connected to the upper and lower yokes respectively; the upper yoke, lower yoke, left yoke, and right yoke all have multiple yoke plates stacked in the yoke thickness direction; the left and right yokes are located on both sides of the core structure.

[0017] Furthermore, the thickness of the iron yoke frame is 1.6 to 1.9 times the diameter of the iron core column.

[0018] Furthermore, the clamping components include an upper clamping component and a U-shaped lower clamping component; the two upper clamping components clamp the upper yoke; the U-shaped lower clamping component clamps the lower yoke, the left yoke, and the right yoke; the upper clamping components and the U-shaped lower clamping component are connected by a hanging plate.

[0019] Furthermore, a cooling oil channel is provided in the middle of the upper yoke.

[0020] Furthermore, an insulating layer is provided between the clamp and the iron yoke frame.

[0021] Secondly, the present invention proposes an assembly method for an ultra-high voltage oil-immersed parallel core reactor as described in the first aspect, comprising:

[0022] Remove the upper end of the clamp from the upper yoke of the yoke frame as a whole;

[0023] The iron core structure is stacked on the lower iron yoke of the iron yoke frame;

[0024] After the coil and core structure are assembled, the upper end of the clamp and the upper yoke of the yoke frame are installed on the upper end of the core structure to clamp the core structure.

[0025] Remove the upper clamp and the upper yoke of the yoke frame as a whole;

[0026] Stack the core structure on the lower yoke of the yoke frame; and assemble the body insulation and coils;

[0027] Install the upper clamp and the upper yoke of the yoke frame onto the upper end of the core structure to clamp the core structure.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] This invention proposes an ultra-high voltage oil-immersed parallel iron-core reactor and method. The reactor has two second iron-core cakes superimposed on both ends of the iron-core column. The air gap between two adjacent second iron-core cakes and between the second iron-core cake and the iron yoke frame is smaller than the air gap inside the iron-core column and between the iron-core column and the second iron-core cake. This improves the ability of the second iron-core cake to collect and conduct leakage magnetic flux at the coil end, alleviates the problem of increased magnetic flux diffraction width caused by excessive air gap between adjacent iron-core cakes in the coil end range, and effectively reduces noise.

[0030] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0032] Figure 1 This is a front view of an ultra-high voltage oil-immersed parallel core reactor disclosed in this invention;

[0033] Figure 2 This is a side view of an ultra-high voltage oil-immersed parallel core reactor disclosed in this invention;

[0034] Figure 3 This is a top view of an ultra-high voltage oil-immersed parallel core reactor disclosed in this invention;

[0035] Figure 4 This is a schematic diagram of the iron core structure disclosed in this invention;

[0036] Figure 5 This is a schematic diagram of the bonding of the second iron core disc and the pad block disclosed in this invention;

[0037] Figure 6 This is a schematic diagram of the iron yoke stack and its shape disclosed in this invention;

[0038] Figure 7 This is a schematic diagram of the iron core post and side yoke installation disclosed in this invention;

[0039] Figure 8 This is a schematic diagram of the upper yoke clamping method disclosed in this invention.

[0040] The components are: 1. Iron core column, 2. Second iron core disc, 3. Pad block, 4. Insulating block, 5. Axial tie rod, 6. Iron yoke frame, 7. Clamp, 8. Pull strap, 9. Horizontal tie rod, 10. Through-core screw, 11. Clamp insulation layer, 12. First iron core disc, 13. Crossbeam, 14. Pressure beam, 15. Pad foot, 16. Clamp grounding, 17. Iron core grounding, 18. Side beam. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0042] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] First, the application scenarios of the ultra-high voltage oil-immersed parallel iron core reactor proposed in this invention will be described.

[0045] This invention proposes an ultra-high voltage oil-immersed parallel core reactor for use in scenarios where noise from parallel core reactors is reduced.

[0046] The higher the transmission voltage level and the longer the transmission line, the greater the demand for the capacity and voltage level of the parallel iron-core reactor, which in turn increases the vibration and noise of the parallel iron-core reactor. How to control reactor noise is currently a hot research topic.

[0047] In related technologies, the core column and the air gap between the core column and the yoke of the oil-immersed parallel core reactor are equal and relatively large, which results in a weak ability to collect and conduct leakage flux at the coil end, leading to higher noise in the parallel core reactor.

[0048] The noise level of 1000kV UHV oil-immersed parallel iron-core reactors has always been in the range of 70dB(A) to 78dB(A). For the 320MVar product with larger capacity, the noise level will be even higher. However, this does not meet the requirement of UHV reactors at the substation boundary that the noise level should be below 64dB(A).

[0049] In the absence of readily available experience, reducing the noise of parallel-core reactors requires a thorough exploration of the first principles of noise generation. Given the numerous disciplines involved and the potential discrepancies between theory and practice, extensive model experiments, simulation analyses, and practical verification are necessary. Based on these research findings, effective noise reduction measures must be implemented to mitigate the noise.

[0050] To reduce the noise of parallel core reactors, this invention focuses on addressing the source of noise and provides a high-voltage oil-immersed parallel core reactor that is structurally sound, easy to operate, cost-effective, stable, and reliable.

[0051] like Figures 1-8 As shown, the present invention proposes an ultra-high voltage oil-immersed parallel iron core reactor, comprising: an iron yoke frame 6, an iron core structure being provided between the upper iron yoke and the lower iron yoke of the iron yoke frame 6; clamps 7 being provided on the front and rear sides of the iron yoke frame 6 respectively, and the two clamps 7 being connected to the iron yoke frame.

[0052] The core structure includes a core post 1, which includes multiple first core discs stacked along the axial direction; two stacked second core discs 2 are arranged between the upper end of the core post 1 and the upper yoke, and two more stacked second core discs 2 are arranged between the lower end of the core post 1 and the lower yoke; air gaps are provided between two adjacent first core discs 12, between the first core disc 12 and the second core disc 2, between two adjacent second core discs 2, and between the second core disc 2 and the yoke frame;

[0053] The air gap height between two adjacent second iron core discs 2 and between the second iron core disc 2 and the iron yoke frame is smaller than the air gap height between two adjacent first iron core discs 12 and between the first iron core disc 12 and the second iron core disc 2.

[0054] The height of the second iron core disc 2 is greater than the height of the first iron core disc 12.

[0055] The reactor proposed in this invention has two second iron core cakes 2 superimposed on both ends of the iron core column, and the air gap between two adjacent second iron core cakes and between the second iron core cake and the iron yoke frame is smaller than the air gap inside the iron core column and between the iron core column and the second iron core cake. This improves the ability of the second iron core cake to collect and conduct leakage magnetic flux at the coil end, alleviates the problem of the magnetic flux diffraction width increasing due to the excessive air gap between adjacent second iron core cakes in the coil end range, and effectively reduces noise.

[0056] The reactor proposed in this invention is unique in that it is a single-phase product with a core structure consisting of a main column with an air gap, surrounded by a rectangular yoke frame. The main column is composed of stacked first and second core discs of varying thicknesses, spacers, and insulating blocks; the yoke frame is composed of stacked yoke plates of equal width, which not only facilitates the transmission of clamping forces but also provides a low magnetic reluctance circuit for the main magnetic flux and most of the leakage magnetic flux.

[0057] In some embodiments, multiple spacers 3 are provided between two adjacent first core discs and between the first core disc and the second core disc 2 to form an air gap; 55%-65% of the area of ​​each first core disc is covered by spacers 3, and the lower the noise requirement, the larger the value is selected.

[0058] Multiple insulating blocks 4 are set between two adjacent second iron core cakes 2 and between the second iron core cake 2 and the iron yoke frame to form an air gap; the number of insulating blocks 4 in each layer is a multiple of the number of pad blocks 3 in each layer.

[0059] The height of the second iron core disc is greater than the height of the first iron core disc. Specifically, the height of the second iron core disc is 3 times the height of the first iron core disc. Approximately 1.5 times, where H is the height of the second iron core disc and h is the height of the first iron core disc.

[0060] The air gap heights between two adjacent second core discs 2 and between the second core disc and the yoke frame are equal; the air gap heights between two adjacent first core discs and between the first and second core discs are equal; however, the air gap heights between two adjacent second core discs 2 and between the second core disc and the yoke frame are less than the air gap heights between two adjacent first core discs and between the first and second core discs. Specifically, the air gap heights between two adjacent second core discs 2 and between the second core disc and the yoke frame satisfy the following relationship with the air gap heights between two adjacent first core discs: 6%. ( ±10%, H 1 represents the air gap height between two adjacent first core discs. h 1 represents the air gap height between two adjacent second iron core discs; the gap is small at the corresponding position at the end of the iron core column, which can collect more leakage flux at the end of the coil and effectively control the flux; the air gap is large in the middle of the iron core column, mainly to meet the requirements of the parallel reactor for the main inductance.

[0061] like Figure 5 As shown, multiple pads 3 are evenly distributed around the circumference of the first iron core disc, and the pads are bonded to the first iron core disc.

[0062] The pad 3 is made of high compressive strength aluminum ceramic pad; the insulating block 4 is made of NOMEX paper; the first and second core discs are made of special low-noise silicon steel sheets B23P090-LM in a ring structure, with the rolling direction of the silicon steel sheets parallel to the central axis of the core column.

[0063] The outer diameters of the first and second core discs are determined by the magnetic flux density of the core structure and the relevant technical parameters of the reactor.

[0064] In some embodiments, the yoke frame 6 includes an upper yoke, a lower yoke, a left yoke, and a right yoke; the upper and lower yokes are arranged opposite to each other; the upper and lower ends of the left yoke are respectively connected to the upper and lower yokes; the two ends of the right yoke are respectively connected to the upper and lower yokes; the upper yoke, lower yoke, left yoke, and right yoke all have multiple yoke plates stacked in the yoke thickness direction; the left and right yokes are located on both sides of the core structure.

[0065] A rectangular yoke frame 6 is formed by the upper yoke, lower yoke, left yoke, and right yoke; the upper and lower yokes are located at the upper and lower ends of the core structure, respectively, and the core column structure is axially clamped by the upper and lower yokes.

[0066] like Figure 6 - Figure 8 As shown, the iron yoke pieces include A-shaped iron yoke pieces, B-shaped iron yoke pieces, C-shaped iron yoke pieces, D-shaped iron yoke pieces, E-shaped iron yoke pieces, F-shaped iron yoke pieces, and G-shaped iron yoke pieces. Among them, the A-shaped iron yoke piece has 45° angled ends; the B-shaped iron yoke piece has a 45° angled end and a right-angled side at the other end; the C-shaped iron yoke piece is an isosceles right-angled triangular iron yoke piece; the D-shaped iron yoke piece has 45° angled ends, but the length of the D-shaped iron yoke piece is less than the length of the A-shaped iron yoke piece; the E-shaped iron yoke piece has the same structure as the D-shaped iron yoke piece; the F-shaped iron yoke piece and the G-shaped iron yoke piece have the same structure, both having a 45° angled end and a right-angled side at the other end, but the length of the F-shaped iron yoke piece and the G-shaped iron yoke piece is less than the length of the B-shaped iron yoke piece.

[0067] C-shaped and B-shaped iron yoke pieces can be spliced ​​together to form A-shaped iron yoke pieces, which is called spliced ​​iron yoke.

[0068] The left yoke is formed by overlapping A-shaped yoke pieces and spliced ​​yoke pieces at intervals. One end of the A-shaped yoke piece is aligned with the end of the B-shaped yoke piece at a 45° angle, and the other end of the A-shaped yoke piece is aligned with the hypotenuse of the C-shaped yoke piece.

[0069] The right yoke and the left yoke are symmetrical.

[0070] The upper and lower yokes are symmetrical structures. Taking the upper yoke as an example, the structure of the upper and lower yokes will be explained. The upper yoke includes D-shaped yoke plates, E-shaped yoke plates, F-shaped yoke plates, and G-shaped yoke plates. Among them, the D-shaped and E-shaped yoke plates are located on both sides of the upper yoke. Two parts of F-shaped and G-shaped yoke plates are sandwiched between the D-shaped and E-shaped yoke plates. The hypotenuses of each part of the F-shaped and G-shaped yoke plates are aligned with the hypotenuses of the left or right yoke, and spliced ​​at a right angle. The straight edges of the two parts of the F-shaped and G-shaped yoke plates are arranged opposite each other, and a channel is reserved between the straight edges of the two parts of the F-shaped and G-shaped yoke plates for the axial tie rod 5 to pass through.

[0071] After the iron yoke frame 6 is formed by stacking iron yoke pieces, a pull strap 8 and a horizontal pull rod 9 are arranged on the inner and outer sides respectively, and a through-core screw 10 is arranged in the middle of the width of the iron yoke pieces; the pull strap 8 and the horizontal pull rod 9 tighten the stacked iron yoke pieces, and the through-core screw 10 connects and fastens the stacked iron yoke pieces together.

[0072] The distance between the through-bolt 10, the horizontal tie rod 9 and the pull belt 8 is normally about 200mm. At the joint of the iron yoke plate, the distance between them is appropriately increased to reduce the distance between them to about 120mm.

[0073] In some embodiments, a heat dissipation oil channel is provided in the middle of the upper yoke. The traditional structure of three cooling oil channels in the yoke is improved by reserving only one w-width heat dissipation oil channel in the middle. Under the premise of meeting the temperature rise limit requirements of the yoke, the magnetic flux distribution in the yoke tends to be more uniform, thereby reducing noise.

[0074] In some embodiments, clamps 7 are provided on both sides of the yoke frame, and the two clamps 7 are connected by a connecting beam, a horizontal tie rod and a strap to clamp the yoke frame.

[0075] The connecting beam includes two crossbeams 13, a pressure beam 14, and a pad 15. One crossbeam connects the upper middle position of the two clamps, and the other crossbeam connects the lower middle position of the two clamps. The pressure beam connects the upper two ends of the two clamps, and the pad connects the lower two ends of the two clamps.

[0076] An axial through-channel is provided in the core structure; the axial tie rod 5 passes through the upper yoke of the yoke frame and the through-channel of the core structure, and then connects to the crossbeam connecting the lower parts of the two clamps. This clamps the core structure.

[0077] The pressure of the second core disc 2 is controlled between 5.5 MPa and 7 MPa, which is 6 to 7 times the rated electromagnetic force between the second (first) core discs. F The calculation formula is: Where B represents magnetic flux density; A represents the cross-sectional area of ​​the second iron core disc; and the pressure of the iron yoke laminations is controlled within the range of 0.1 MPa to 0.15 MPa.

[0078] The clamping components include an upper clamp and a U-shaped lower clamp; the two upper clamps clamp the upper yoke; the U-shaped lower clamp clamps the lower yoke, left yoke, and right yoke; the upper clamp and the U-shaped lower clamp are connected by a hanging plate.

[0079] To ensure uniform stress on the yoke plates, each side clamp is a "U"-shaped stable frame formed by an insulated connection between a straight upper clamp and a "U"-shaped lower clamp. The front and rear clamps are connected by a crossbeam 13, a pressure beam 14, pads 15, side beams 18, horizontal tie rods, steel straps, and insulating straps, forming a rigid frame that stably connects the two sides. An insulating layer 11 is provided between the clamps and the yoke frame. The insulating layer is made of hot-pressed polyester resin, which has excellent electrical properties, a heat resistance temperature above 180 degrees Celsius, and excellent hardness and oil impregnation properties. The clamps are connected to the clamp grounding 16, and the iron core structure is connected to the iron core grounding 17.

[0080] Because silicon steel sheets with lower noise and higher performance are more delicate, proper use and management are essential to fully realize their potential; otherwise, their overall cost-effectiveness will be affected. To ensure that the performance of the B23P090-LM low-noise cold-rolled silicon steel sheet is fully realized, the assembly process of an ultra-high voltage oil-immersed parallel core reactor proposed in this invention is described in detail.

[0081] The assembly process of an ultra-high voltage oil-immersed parallel core reactor proposed in this invention includes:

[0082] (1) Preparation work, including strict control of the shearing dimensions of silicon steel sheets used for the second iron core disc 2, the first iron core disc and the iron yoke, wherein the shearing burrs are no more than 10μm; the materials of axial tie rod 5, horizontal tie rod 9, through-core tie rod 10, etc. are all TSMF166; all pads that serve as air gaps in the iron core column are aluminum ceramic pads; the insulation layer 11 of the clamping parts is made of hot-pressed polyester resin plastic laminate with excellent comprehensive performance in heat resistance, mechanical and electrical properties; when welding iron core structural parts such as clamping parts 7, in order to control residual stress, it is not allowed to weld to the position in one go with coarse welding rods. Fine welding rods should be used to weld at least twice. After welding, the stress is released by knocking. After all metal parts are processed, they are pre-assembled. The flatness, parallelism, diagonal tolerance, etc. are strictly controlled with the help of measuring platform and measuring instruments. Any non-compliance is corrected in time to avoid uneven stress on the silicon steel sheets when the iron core is clamped. NOMEX paper is also a high-temperature resistant material used between the core post and the upper and lower yokes, mainly for adjustment. Its diameter is the same as that of pad 3. The insulation block is 1mm thick, and the pad is 1.5mm thick. The number of insulation blocks is a multiple of the number of pads of the same diameter.

[0083] (2) The iron yoke frame and clamps are horizontally stacked, and the process includes:

[0084] On the iron core stacking platform, one side of the clamping component 7 and clamping insulation layer 11 are placed. Using certain through-bolt holes in the yoke frame and employing pin positioning, a single-piece stacking process is used to sequentially stack the yoke pieces and iron core oil channels to the target size. During stacking, every 100mm of thickness requires comprehensive measurement to control dimensional tolerances at each location for timely correction. Finally, the other side of the clamping insulation layer 11 and clamping component 7 are installed. When fastening the clamping components and yoke frame with fasteners such as the pull strap 8, horizontal pull rod 9, through-bolt 10, crossbeam 13, and side beam 18, a "C-type" clamping fixture is used. The yoke frame and clamping components are first clamped to the specified size and pressure before the fasteners are installed, ensuring uniform torque throughout. Because the stacking and clamping are performed horizontally at this stage, tolerances at each location can be controlled more precisely.

[0085] (3) Installing the iron core structure, the process includes:

[0086] The structural feature of the reactor proposed in this invention is that, during the disassembly of the upper yoke, it is not necessary to separate the upper clamping parts and the upper yoke laminations; instead, they are disassembled and assembled as a whole I. The lower yoke and side yokes are also a whole, marked H. The specific operation method is as follows: loosen the side beams and connectors at the upper left and right corners of the yoke frame and clamping assembly J, and remove the C-shaped piece from the yoke frame laminations 6, marked K in this description. Then, the upper yoke clamping assembly I can be removed as a whole. Subsequently, the core structure, body insulation, and coils can be assembled according to the process requirements. The upper yoke clamping assembly I and the upper yoke corner connecting piece K are then reassembled. The upper yoke corner connecting piece K not only acts as a magnetic circuit but also serves a connecting function. This avoids the impact of repeated disassembly and reassembly of the laminations used in the upper yoke on the core performance. At the same time, because the upper yoke and side yokes (left yoke and right yoke) are accurately controlled and clamped very well during the initial stacking, the dimensions of the yoke frame and clamping components at the upper left and right corners of the final assembly can be well controlled during the reassembly of the upper yoke. This plays a very important role in ensuring noise control.

[0087] This invention proposes an ultra-high voltage oil-immersed parallel core reactor. Through ingenious design of the thickness and arrangement order of the second core cake, first core cake, aluminum ceramic pad, and insulating block, it further enhances the ability of the second core cake to collect and conduct leakage flux at the coil end while meeting the reactor's technical parameter requirements. This alleviates the problem of increased flux diffraction width caused by excessive air gaps between adjacent second core cakes within the coil end range. Furthermore, by increasing the yoke stack thickness—typically about 1.1 times the core column diameter—it increases it to over 1.6 times, reducing... While low yoke magnetic flux density and magnetostriction generate noise, they also provide a wider path for coil leakage flux. By designing a high-strength TSMF166 tie rod in the middle of the core structure, the displacement of the second and first core discs caused by electromagnetic force is effectively limited, controlling their displacement amplitude to single digits in the μm range, significantly reducing the intensity of the sound source. Components such as through-core screws, pull straps, tie rods, insulation layers, side beams, and crossbeams are used, and clamps and their insulation layers are employed to uniformly clamp the yoke sheets, ultimately resulting in uniform pressure across the yoke sheets and eliminating localized residual stress. This ultimately makes the magnetostriction level of the low-noise silicon steel sheet nearly equal to laboratory data, achieving precise control and long-term stability of the noise in oil-immersed parallel core reactors.

[0088] The present invention proposes an ultra-high voltage oil-immersed parallel iron core reactor, which has the characteristics of reasonable structure, easy operation, high cost performance, and stable reliability. It is suitable for widespread application in ultra-high voltage, large capacity, low noise parallel iron core reactors.

[0089] This invention also proposes an assembly method for an ultra-high voltage oil-immersed parallel core reactor, comprising:

[0090] Remove the upper end of the clamp from the upper yoke of the yoke frame as a whole;

[0091] The iron core structure is stacked on the lower iron yoke of the iron yoke frame;

[0092] After the coil and core structure are assembled, the upper end of the clamp and the upper yoke of the yoke frame are installed on the upper end of the core structure to clamp the core structure.

[0093] The assembly method proposed in this invention involves first removing the upper yoke and upper clamp after the core structure is erected, then installing the coil and body insulation components, and finally reassembling the upper yoke and upper clamp back together.

[0094] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A super-high voltage oil-immersed parallel core reactor, characterized in that, include: The iron yoke frame has an iron core structure between the upper and lower iron yokes; clamps are set on the front and rear sides of the iron yoke frame, and the two clamps are connected to the iron yoke frame. The iron yoke frame includes an upper iron yoke, a lower iron yoke, a left iron yoke, and a right iron yoke; the upper and lower iron yokes are arranged opposite each other; the upper and lower ends of the left iron yoke are connected to the upper and lower iron yokes respectively; the two ends of the right iron yoke are connected to the upper and lower iron yokes respectively; the upper iron yoke, lower iron yoke, left iron yoke, and right iron yoke all have multiple iron yoke plates stacked in the iron yoke thickness direction; the left and right iron yokes are located on both sides of the iron core structure; a heat dissipation oil channel is provided in the middle of the upper iron yoke; The core structure includes a core column, which comprises multiple first core discs stacked axially. Two stacked second core discs are disposed between the upper end of the core column and the upper yoke, and two more stacked second core discs are disposed between the lower end of the core column and the lower yoke. Air gaps are provided between adjacent first core discs, between first and second core discs, between adjacent second core discs, and between second core discs and the yoke frame. The thickness of the yoke frame is 1.6 to 1.9 times the diameter of the core column. The air gap height between two adjacent second core discs and between a second core disc and the yoke frame is less than the air gap height between two adjacent first core discs and between a first core disc and a second core disc; the air gap height between two adjacent second core discs and between a second core disc and the yoke frame is equal; the air gap height between two adjacent first core discs and between a first core disc and a second core disc is equal; the air gap height between two adjacent second core discs and between a second core disc and the yoke frame satisfies the following relationship with the air gap height between two adjacent first core discs: 6% ( ±10%, H1 is the air gap height between two adjacent first iron core discs, and h1 is the air gap height between two adjacent second iron core discs; The height of the second iron core disc is greater than the height of the first iron core disc.

2. The ultra-high voltage oil-immersed parallel core reactor as described in claim 1, characterized in that, Multiple spacers are placed between adjacent first core discs and between the first and second core discs to form air gaps; 55%-65% of the area of ​​each first core disc is covered by spacers. Multiple insulating blocks are set between two adjacent second core discs and between the second core disc and the yoke frame to form an air gap; the number of insulating blocks in each layer is a multiple of the number of pads in each layer.

3. The ultra-high voltage oil-immersed parallel core reactor as described in claim 1, characterized in that, The clamps and the iron yoke frame are fixed together by screws and straps; the two clamps are also connected by a connecting beam.

4. The ultra-high voltage oil-immersed parallel core reactor as described in claim 3, characterized in that, The connecting beam includes two crossbeams, a pressure beam, and a pad. One crossbeam connects the upper middle position of the two clamps, and the other crossbeam connects the lower middle position of the two clamps. The pressure beam connects the upper ends of the two clamps, and the pad connects the lower ends of the two clamps. The iron core structure has an axial through-channel; the axial tie rod passes through the upper iron yoke of the iron yoke frame and the through-channel of the iron core structure and is connected to the crossbeam connecting the lower part of the two clamps.

5. The ultra-high voltage oil-immersed parallel core reactor as described in claim 1, characterized in that, The clamping components include an upper clamp and a U-shaped lower clamp; the two upper clamps clamp the upper yoke; the U-shaped lower clamp clamps the lower yoke, left yoke, and right yoke; the upper clamp and the U-shaped lower clamp are connected by a hanging plate.

6. The ultra-high voltage oil-immersed parallel core reactor as described in claim 1, characterized in that, An insulating layer is provided between the clamp and the iron yoke frame.

7. The assembly method of an ultra-high voltage oil-immersed parallel core reactor as described in any one of claims 1-6, characterized in that, include: Remove the upper end of the clamp from the upper yoke of the yoke frame as a whole; The iron core structure is stacked on the lower iron yoke of the iron yoke frame; After the coil and core structure are assembled, the upper end of the clamp and the upper yoke of the yoke frame are installed on the upper end of the core structure to clamp the core structure.

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