Supporting structure for multi-layer stacked dry-type air-core reactor

Abstract

The invention discloses a supporting structure for a multi-layer stacked dry-type air-core reactor, and belongs to the technical field of reactors, the supporting structure comprises a plurality of all-insulation coils, each all-insulation coil is independently supported through an inner side flange insulator and an outer side flange insulator, mechanical decoupling is achieved among all the all-insulation coils, and the all-insulation coils are separated from each other through the inner side flange insulator and the outer side flange insulator. The inner side flange insulator is connected to the center of the all-insulation coil, and the outer side flange insulator is connected to the outer end of the all-insulation coil. Through the stacking design and the independent supporting mechanism of the multi-layer all-insulation coil, high modular adaptability is achieved, the number of layers can be flexibly adjusted according to the extra-high voltage grade, the universality of equipment is enhanced, the all-insulation coil is combined with the inner side flange insulator and the outer side flange insulator for independent supporting, and the reliability of the equipment is improved. The mechanical decoupling flexible structure greatly reduces the overall natural vibration frequency, improves the anti-seismic performance, meets the requirement of a high-intensity earthquake area, and comprehensively guarantees the insulation safety under extra-high voltage.

Description

Technical Field

[0001] This invention belongs to the field of reactor technology, and particularly relates to a support structure for multi-layer stacked dry air reactors. Background Technology

[0002] With the continuous increase in voltage levels of ultra-high voltage and extra-high voltage power grids, the performance requirements for reactors in main lines are becoming increasingly stringent. Currently, oil-immersed reactors are mostly used in extra-high voltage main lines, but they have significant drawbacks: the use of air-gap iron cores leads to large leakage flux, strong inherent vibration, high noise, and is prone to internal spiral loosening, voltage equalization ball breakage, and even discharge fires; in addition, there are risks of bushing failure and oil leakage, and high-cost annual regular maintenance is required.

[0003] Dry-type air-core reactors are favored for their stable operation and maintenance-free nature, and have played an important role in the localization of my country's ultra-high voltage AC / DC projects. Depending on the voltage and connection method, dry-type air-core reactors are available in two forms: flat and stacked. Among them, the stacked form is more advantageous due to its high mutual inductance utilization and small footprint. However, the traditional stacking scheme is limited by electrical insulation capacity and supporting structure strength, and can usually only be applied to low-voltage lines. It is difficult to meet the stringent requirements of ultra-high voltage environment for insulation level and seismic performance (such as the seismic resistance coefficient needs to reach 0.5g).

[0004] Therefore, there is an urgent need to design a support structure for multi-layer stacked dry air reactors to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a support structure for multi-layer stacked dry-type air-core reactors, which has the advantages of high insulation reliability, excellent seismic performance, low loss and high stability, and solves the problems of insufficient insulation strength, poor structural stability, weak seismic performance and eddy current heating faced by dry-type air-core reactors when stacked in multiple layers in ultra-high voltage lines.

[0006] To achieve the above objectives, the specific technical solution of the support structure for a multi-layer stacked dry-type hollow reactor of the present invention is as follows: A support structure for a multi-layer stacked dry-type air-core reactor includes multiple fully insulated coils. Each fully insulated coil is independently supported by an inner flange insulator and an outer flange insulator, thereby achieving mechanical decoupling between the fully insulated coils. The inner flange insulator is connected to the center of the fully insulated coil, and the outer flange insulator is connected to the outer end of the fully insulated coil.

[0007] Furthermore, the fully insulated coil includes multiple diamond-shaped supports, which are arranged in a circular array with the same spacing to form a support ring. Wires are wound around the support ring, and the fully insulated coil is formed after the wires and the support ring are cured.

[0008] Furthermore, the rhomboid support includes a first star-shaped arm and a second star-shaped arm, with wires wound around the first star-shaped arm and the second star-shaped arm.

[0009] Furthermore, the first star-shaped arm is located above the second star-shaped arm.

[0010] Furthermore, the outer side of the second star-shaped arm is provided with a first connecting part, which is connected to the outer flange insulator.

[0011] Furthermore, a second connecting hole is provided on the inner side of the second star-shaped arm. After multiple diamond-shaped supports form a support ring, multiple second connecting holes form a second connecting part, which is connected to the inner flange insulator through the second connecting part.

[0012] Furthermore, the first and second star-shaped arms are rhomboid in shape to increase the contact area with the conductor, reduce the pressure per unit area, increase the creepage distance on the inner and outer sides, and reduce the risk of surface discharge.

[0013] Furthermore, the support structure also includes binding pads, which are used to bind and reinforce the coil during the encapsulation stage of wire winding.

[0014] Furthermore, the inner flange insulator is made of non-metallic material.

[0015] Furthermore, the outer flange insulator is made of metal.

[0016] The present invention has the following advantages: (1) High insulation reliability: The use of fully insulated coils combined with independent support of inner and outer flange insulators, as well as the increased creepage distance of the diamond-shaped support arm, fully ensures the insulation safety under ultra-high voltage.

[0017] (2) Excellent seismic performance: The flexible support structure with mechanical decoupling of each coil greatly reduces the overall natural frequency, making the seismic resistance coefficient of the reactor reach 0.5g, which can meet the requirements of use in high-intensity earthquake zones.

[0018] (3) High modularity and adaptability: The multi-layer stacked design can flexibly adjust the number of layers according to the voltage level, which is highly versatile and has a wide range of applications. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the support structure of the present invention; Figure 2 This is a schematic diagram of the structure of the third outer flange insulator of the present invention; Figure 3 This is a schematic diagram of the structure of the fourth outer flange insulator of the present invention; Figure 4 This is a schematic diagram of the structure of the first inner flange insulator of the present invention; Figure 5 This is a schematic diagram of the structure of the second inner flange insulator of the present invention; Figure 6 This is a schematic diagram of the structure of the fully insulated coil of the present invention; Figure 7 This is a schematic diagram of the structure of the first star-shaped arm of the present invention; Figure 8 This is a schematic diagram of the structure of the second star-shaped arm of the present invention; Figure 9 This is a schematic diagram of the binding pad of the present invention.

[0020] The markings in the diagram are as follows: 1. Fully insulated coil; 11. First star-shaped arm; 12. Second star-shaped arm; 121. First connecting part; 122. Second connecting hole; 13. Conductor; 14. Binding pad; 141. First slot; 142. Second slot; 2. Outer flange insulator; 21. Third outer flange insulator; 22. Fourth outer flange insulator; 3. Inner flange insulator; 31. First inner flange insulator; 32. Second inner flange insulator. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

[0022] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0023] The following is a reference to the appendix. Figure 1 To be continued Figure 9 This invention describes a support structure for a multilayer stacked dry air reactor.

[0024] This support structure includes multiple fully insulated coils 1, which are stacked one on top of the other. The multi-layer stacking design allows for adjustment of the number of coil layers according to the ultra-high voltage level, enhancing the versatility and adaptability of the equipment. Each fully insulated coil 1 is independently supported by an inner flange insulator 3 and an outer flange insulator 2, which enables mechanical decoupling between the fully insulated coils 1. The inner flange insulator 3 is connected to the center of the fully insulated coil 1, and the outer flange insulator 2 is connected to the outer end of the fully insulated coil 1.

[0025] Each fully insulated coil 1 is independently fixed by an inner flange insulator 3 and an outer flange insulator 2. The inner insulator connects to the center of the fully insulated coil 1 to provide radial support, and the outer insulator connects to the outer end of the coil to provide circumferential reinforcement. This allows the fully insulated coil 1 to move independently during vibration or thermal expansion and contraction, reducing mutual interference and thus achieving mechanical decoupling. Multiple fully insulated coils 1 constitute a system similar to a multi-degree-of-freedom system. By reducing stiffness, resonance is suppressed, which meets the requirements of dynamic stability in ultra-high voltage environments.

[0026] Specifically, the inner flange insulator 3 is made of non-metallic material. The inner flange insulator 3 is integrally cast to ensure the connection strength and stability between its flange and the composite material core rod. The specific structural dimensions and strength of its flange need to be accurately calculated and designed according to the total weight and number of layers of the stacked coils. Furthermore, the flange of the inner non-metallic flange insulator needs to be made of non-magnetic, high-strength materials such as high-strength fiberglass to eliminate eddy current effects.

[0027] There are two types of inner flange insulators 3: a first inner flange insulator 31 and a second inner flange insulator 32. The first inner flange insulator 31 is longer than the second inner flange insulator 32. The first inner flange insulator 31 and the second inner flange insulator 32 are made of the same material. Adjacent fully insulated coils 1 are connected by the second inner flange insulator 32. The lower center of the lowest fully insulated coil 1 is connected to the first inner flange insulator 31 and is connected to the ground or support through the first inner flange insulator 31. The graded support of the first inner flange insulator 31 and the second inner flange insulator 32 allows the load to be transferred step by step from the upper layer to the base, reducing stress concentration. At the same time, the consistent material of the inner flange insulators 3 ensures insulation continuity.

[0028] Specifically, the outer flange insulator 2 is made of metal and can be a conventional insulator structure. The number of outer flange insulators 2 is the same as the number of diamond brackets, so that each diamond bracket corresponds to one outer flange insulator 2, forming circumferentially evenly spaced supports. This one-to-one correspondence allows the load to be evenly transferred to the outer frame, preventing local overload.

[0029] There are two types of outer flange insulators 2: the third outer flange insulator 21 and the fourth outer flange insulator 22. The length of the third outer flange insulator 21 is longer than that of the fourth outer flange insulator 22. The third outer flange insulator 21 and the fourth outer flange insulator 22 are made of the same material. Adjacent fully insulated coils 1 are connected by the fourth outer flange insulator 22. The lower outer side of the fully insulated coil 1 located at the bottom of the multi-layer fully insulated coil 1 is connected to the third outer flange insulator 21, and is connected to the ground or support through the third outer flange insulator 21.

[0030] The fully insulated coil 1 includes multiple rhomboid supports, which are arranged in a circular array with the same spacing to form a support ring. Wires 13 are wound around the support ring. After the wires 13 and the support ring are cured, the fully insulated coil 1 is formed. The rhomboid supports are arranged in a circular array to form a support ring, which serves as the base for winding the wires 13. After winding, the entire coil assembly is sent to a curing oven for curing treatment, so that the wires 13 and the support ring are firmly combined into a complete fully insulated coil 1, eliminating internal gaps, improving vibration resistance and heat resistance, and the circular layout of the support ring optimizes the magnetic field distribution and reduces edge effects.

[0031] Preferably, the specific number of diamond-shaped supports is eight. In other embodiments of the present invention, other numbers may be selected according to the coil diameter to optimize stress and manufacturing process.

[0032] The rhomboid support includes a first star-shaped arm 11 and a second star-shaped arm 12. A wire 13 is wound around the first star-shaped arm 11 and the second star-shaped arm 12. The first star-shaped arm 11 and the second star-shaped arm 12 together form a rhomboid support surface. The wire 13 is directly wound around the arm, providing continuous support through the geometry of the first star-shaped arm 11 and the second star-shaped arm 12. During winding, the wire 13 makes full contact with the surfaces of the first star-shaped arm 11 and the second star-shaped arm 12, and after curing, a firm bond is formed to prevent loosening.

[0033] Specifically, the first star-shaped arm 11 is located above the second star-shaped arm 12.

[0034] The outer side of the second star-shaped arm 12 is provided with a first connecting part 121, which is connected to the outer flange insulator 2. Specifically, the first connecting part 121 is provided with a first connecting hole, the number of which is the same as the number of flange holes on the outer flange insulator 2. After the first connecting hole and the flange hole on the outer flange insulator 2 coincide, they are fastened together by bolts.

[0035] The inner side of the second star-shaped arm 12 is provided with a second connecting hole 122. After multiple diamond-shaped brackets form a bracket ring, multiple second connecting holes 122 form a second connecting part, which is connected to the inner flange insulator 3 through the second connecting part. Specifically, the number of second connecting holes 122 is the same as the number of flange holes on the inner flange insulator 3. After the second connecting holes 122 coincide with the flange holes on the inner flange insulator 3, they are fastened together by bolts.

[0036] The second connecting hole 122 on the inner side of the second star-shaped arm 12 forms an annular connecting interface, i.e., the second connecting part, after the bracket ring is assembled. It is fixed to the flange hole of the inner flange insulator 3 by bolts. This design allows the load to be evenly transferred from the center of the coil to the inner flange insulator 3. The shear strength of the bolts is used to resist the radial force and ensure the overall concentricity.

[0037] The first star-shaped arm 11 and the second star-shaped arm 12 are rhomboid in order to increase the contact area with the conductor 13, reduce the pressure per unit area, increase the creepage distance on the inner and outer sides, and reduce the risk of surface discharge.

[0038] This support structure also includes binding pads 14, which are used to bind and reinforce the coil during the encapsulation stage of winding the wire 13. Specifically, the binding pads 14 have a first slot 141 and a second slot 142. The binding pads 14 can be engaged with the first star arm 11 or the second star arm 12 through the first slot 141, and can be engaged with fiberglass straps through the second slot 142. After curing, the binding pads 14 become part of the fully insulated coil 1, providing additional support points to resist vibrations caused by electromagnetic forces during operation.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A support structure for multi-layer stacked dry-type air-core reactors, characterized in that, It includes multiple fully insulated coils, each of which is independently supported by an inner flange insulator and an outer flange insulator, thereby achieving mechanical decoupling between the fully insulated coils. The inner flange insulator is connected to the center of the fully insulated coil, and the outer flange insulator is connected to the outer end of the fully insulated coil.

2. The support structure for multi-layer stacked dry-type hollow reactors according to claim 1, characterized in that, The fully insulated coil consists of multiple diamond-shaped supports arranged in a circular array with the same spacing to form a support ring. Wires are wound around the support ring, and the fully insulated coil is formed after the wires and support ring are cured.

3. The support structure for multi-layer stacked dry-type hollow reactors according to claim 2, characterized in that, The diamond-shaped support includes a first star-shaped arm and a second star-shaped arm, with wires wound around the first and second star-shaped arms.

4. The support structure for multi-layer stacked dry-type hollow reactors according to claim 3, characterized in that, The first star-shaped arm is located above the second star-shaped arm.

5. The support structure for multi-layer stacked dry-type hollow reactors according to claim 3, characterized in that, The second star-shaped arm has a first connecting part on its outer side, which is connected to the outer flange insulator.

6. The support structure for multi-layer stacked dry-type air-core reactors according to claim 3, characterized in that, The inner side of the second star-shaped arm has a second connecting hole. After multiple diamond-shaped brackets form a bracket ring, multiple second connecting holes form a second connecting part, which is connected to the inner flange insulator through the second connecting part.

7. The support structure for multi-layer stacked dry-type hollow reactors according to claim 3, characterized in that, The first and second star-shaped arms are rhomboid in shape to increase the contact area with the conductor, reduce the pressure per unit area, increase the creepage distance on the inner and outer sides, and reduce the risk of surface discharge.

8. The support structure for multi-layer stacked dry-type air-core reactors according to claim 3, characterized in that, It also includes binding pads, which are used to bind and reinforce the coil during the encapsulation stage of wire winding.

9. The support structure for multi-layer stacked dry-type air-core reactors according to claim 1, characterized in that, The inner flange insulator is made of non-metallic material.

10. The support structure for multi-layer stacked dry-type air-core reactors according to claim 1, characterized in that, The outer flange insulator is made of metal.

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