Light dry-type air-core reactor

Abstract

The utility model discloses a light dry-type air-core reactor, which comprises an upper star-shaped frame, a reactor coil, a lower star-shaped frame, a grading ring and a post insulator, an upper star-shaped frame is arranged at the upper end of the reactor coil, a lower star-shaped frame is arranged at the lower end of the reactor coil, grading rings are arranged on the upper star-shaped frame and the lower star-shaped frame, a flange is arranged at the bottom of the lower star-shaped frame, and a supporting insulator is arranged at the bottom of the reactor coil. According to the light reactor, the novel insulation combination film is adopted to wrap the rectangular transposition aluminum stranded wires to form the reactor package, the mode that a protection insulation layer wrapped by alkali-free glass fibers is impregnated with epoxy resin of a traditional reactor is omitted in the middle package, and the light reactor has the advantages of being small in size, light in weight and good in heat dissipation performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of reactors, and in particular relates to a light dry-type air-core reactor. Background Art

[0002] At present, the traditional dry-type air-core reactors used in power systems are usually closed products, which are characterized by the use of multiple layers of densely wound insulated wires and glass fiber tapes impregnated with epoxy resin for winding, which results in a large volume and weight of the product. In addition, the metal wires are enclosed in insulating materials, which is not conducive to the overall heat dissipation of the product.

[0003] Chinese patent (CN 214705681 U) a dry-type hollow filter reactor, including a reactor coil, the reactor coil is a multi-layer cylindrical parallel structure, a sound insulation cover is arranged outside the reactor coil, the airway formed between each layer of the reactor coil adopts a pull-out rod as a support between the coil packages, star frames are arranged at the upper and lower ends of the reactor coil, and grading rings are arranged at the upper and lower ends of the star frame, and a composite support insulator support is arranged at the lower end of the grading ring.

[0004] Compared with light dry-type air-core reactors, this enclosed product is not only heavy and large in size, but also has many manufacturing processes and is time-consuming. In addition, the product may suffer from local overtemperature and inter-turn insulation breakdown, which may easily lead to product safety failures. Summary of the invention

[0005] In order to overcome the defects of the above-mentioned prior art, the purpose of the utility model is to provide a lightweight dry-type air-core reactor. By using an insulating composite film to wrap the rectangular transposed aluminum stranded wire to wind the reactor encapsulation, the lightweight reactor has the characteristics of small size, light weight and good heat dissipation performance.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A light dry-type air-core reactor comprises an upper star frame, a reactor coil, a lower star frame, a grading ring, and a support insulator;

[0008] An upper star frame is arranged at the upper end of the reactor coil, and a lower star frame is arranged at the lower end. The upper star frame and the lower star frame are provided with grading rings. The bottom of the lower star frame is a flange. A support insulator is arranged at the bottom of the reactor coil.

[0009] The reactor coil is composed of multiple layers of cylindrical windings connected in parallel, and the heat dissipation channels are formed by drawing bars between each winding layer. The winding layer is a multi-layer cylindrical parallel structure. It has good heat dissipation. The drawing bar shape uses modified unsaturated polyester resin drawing rods as support between the wire packages to form a vertical heat dissipation airway, and the outer surface is coated with acrylic polyurethane enamel and RTV-Ⅱ glue.

[0010] The shape and structure of the pull-out stay is a rectangular strip, and is a glass fiber reinforced plastic product formed by a pultrusion process with unsaturated resin or epoxy resin as a matrix and alkali-free untwisted glass fiber as a reinforcing material.

[0011] The innermost winding layer and the outermost winding layer of the winding layer are wrapped with epoxy resin impregnated alkali-free glass fibers to form an insulating protective layer, and the remaining winding layers are not wrapped with epoxy resin impregnated alkali-free glass fibers to form an insulating protective layer.

[0012] Each winding layer is continuously wound with a rectangular transposed aluminum strand wrapped with an insulating composite film without joints. The outer layer of the transposed aluminum strand is wrapped with 2 to 3 layers of insulating film (polyester film or polyimide film), and the outermost layer is wrapped with polyester glass tape material.

[0013] The insulated composite film-wrapped rectangular transposed aluminum stranded wire is composed of one or more aluminum stranded wires, wherein each aluminum stranded wire is formed by twisting multiple film-wrapped small round aluminum conductors, and a single small round conductor is wrapped with one or more layers of insulation film.

[0014] Each of the winding layers is composed of a plurality of coils connected in parallel, and each coil has lead wires at both ends, and the lead wires are welded to the aluminum rows of the upper star frame and the lower star frame by argon arc welding.

[0015] The upper and lower star frames are welded by high-strength alloy aluminum bars (profiles), and are mesh-bound and horizontally bound by epoxy resin-impregnated glass fiber tapes.

[0016] End ring pads are arranged between the upper and lower star frames and each winding layer of the coil, and are vertically bound by epoxy glass fiber tapes.

[0017] The end ring gasket is made of rectangular insulating materials of different heights. The top of each end ring gasket is provided with a groove for fixing the wire, and the bottom is provided with a mounting hole for fixing the aluminum bar.

[0018] The upper and lower ends of each winding layer are fastened and connected by combining an insulating pull rod and an insulating spacer, and the two ends of the insulating pull rod are locked by insulating nuts.

[0019] The insulating spacers are made of rectangular insulating materials of different thicknesses. Each insulating spacer is designed to be stepped according to the height of the winding layer conductors, and a mounting hole is processed in the middle to facilitate the insulating pull rod to pass through for fixing.

[0020] Beneficial effects of the utility model:

[0021] (1) Light overall weight: The intermediate winding layers of the lightweight dry-type air-core reactor eliminate the inner and outer epoxy resin insulation encapsulation layers used in the traditional dry-type air-core reactor, and use insulated aluminum stranded wire for coil winding, thus saving a large amount of insulation materials, making the product lighter and more energy-efficient. Compared with traditional dry-type air-core reactors, the coil weight is reduced by 30%-45% at the same capacity; at the same time, the number of star-shaped frame arms and the number of bottom support insulators of the lightweight product are relatively reduced, which reduces the additional loss of the product and is conducive to the verification of seismic resistance.

[0022] (2) Good heat dissipation performance: Since the coil of the lightweight dry-type air-core reactor does not require an epoxy resin encapsulation layer, the aluminum stranded wire is in direct contact with the air, and the support bars between the coil winding layers can be adjusted according to the product capacity and external dimensions, the heat dissipation conditions of the entire product are better and the heat resistance level of the product is improved. At the same time, the reactor can be used directly outdoors after being treated with special external surface protection measures, without being restricted by any environmental conditions.

[0023] (3) Relatively small size: Under the same technical conditions, the outer diameter of lightweight reactors is smaller than that of traditional dry-type air-core reactors. For installation sites with limited construction areas, the small size of the reactor can reduce the electromagnetic installation distance of the product, thereby saving more floor space. For example, in offshore wind power projects, indoor compact projects and other projects, lightweight solutions have obvious advantages.

[0024] (4) Easier operation and maintenance: Most of the conductors of the lightweight dry-type air-core reactor are exposed to the air, so the operating status of the product can be observed intuitively. At the same time, it is made of flame-retardant materials, does not require strict fire prevention measures, has a small maintenance workload, and has high operational safety and reliability.

[0025] (5) High cost performance: Under the same engineering requirements, the overall price of this patented lightweight product is lower than that of traditional dry-type air-core reactors. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a lightweight dry-type air-core reactor.

[0027] Figure 2 This is a partial schematic diagram of a lightweight dry-type air-core reactor coil.

[0028] Figure 3 It is the 3D schematic diagram and three-view drawing of the end ring gasket.

[0029] Figure 4 It is the 3D schematic diagram and three-view drawing of the insulating spacer.

[0030] Figure 5 This is the front view of the insulating pull rod.

[0031] Figure 6 This is the three-view drawing of the insulating nut. DETAILED DESCRIPTION

[0032] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0033] like Figure 1 As shown: the light dry-type air-core reactor as a whole comprises, from top to bottom, an upper star frame 1, a reactor coil 2, a lower star frame 3, a product grading ring 4, and a support insulator 5.

[0034] The upper star frame 1 and the lower star frame 3 mainly bring together the wires of each winding layer 7 and transmit current through an external connecting busbar; since the inductor is suitable for higher system voltages, in order to prevent corona from being generated during operation, product grading rings 4 are arranged at high field strength positions at the upper and lower ends of the inductor coil 2.

[0035] like Figure 2 As shown: the reactor coil 2 is composed of multiple layers of cylindrical winding layers 7 in parallel, and is wound with combined film-wrapped rectangular transposed aluminum stranded wire. Except for the innermost layer and the outermost layer, which are wrapped with epoxy resin impregnated alkali-free glass fibers to form an insulating protective layer, the other winding layers are not provided with such protective layers. The heat dissipation channels are formed by drawing and pulling struts between each winding layer 7. The wires are continuously wound in each winding layer 7 without joints, and all the external lead wires are welded to the aluminum bars of the upper and lower star frames by argon arc welding. The upper and lower star frames are welded with high-strength alloy aluminum bars (profiles), and are mesh-bound and horizontally bound with epoxy resin impregnated glass fiber tapes. The reactor coil uses epoxy glass fiber tapes to vertically bind the metal star frame and each winding layer. The wires of each winding layer are impregnated with epoxy glue, and the upper and lower ends are fastened by insulating pull rods. After high-temperature curing, they become a solid whole to reduce noise transmission. The coil airway support of the reactor uses modified unsaturated polyester resin lead rods as the support between the coil packages to form a vertical heat dissipation airway, and the outer surface is coated with acrylic polyurethane enamel and RTV-Ⅱ glue. The product grading ring 4 is designed at the upper and lower ends of the reactor to prevent corona during operation.

[0036] The utility model adopts a closed product of a traditional dry-type air-core reactor. The reactor coil is wound with a flat transposed aluminum stranded wire using a tool, and is wrapped with epoxy resin-impregnated alkali-free glass fibers. A multi-layer cylindrical parallel structure (with airway struts between each layer) is used. An upper star frame 1 and a lower star frame 3 are vertically and horizontally tied together with epoxy resin-impregnated glass fiber tapes, and are cured and formed at high temperature.

[0037] like Figure 3-Figure 6 As shown, end ring spacers 6 are arranged between the upper and lower star frames and each winding layer 7 of the coil, and are vertically bound by epoxy glass fiber tape.

[0038] The end ring spacers 6 are made of rectangular insulating materials of different heights. Each end ring spacer 6 has a groove for fixing the wire on the top and a mounting hole for fixing the aluminum bar on the bottom.

[0039] The upper and lower ends of each winding layer 7 are fastened and connected by a combination of an insulating tie rod 8 and an insulating spacer 9 , and both ends of the insulating tie rod are locked by insulating nuts 10 .

[0040] The insulating spacers 9 are made of rectangular insulating materials of different thicknesses. Each insulating spacer 9 is designed to be stepped according to the height of the winding layer conductors, and a mounting hole is processed in the middle to facilitate the insulating pull rod to pass through for fixing.

[0041] The working principle of this utility model:

[0042] The lightweight dry-type hollow reactor installs the coil of the reactor product on the ground through the support insulator 5 at the bottom. The reserved terminals on the upper star frame 1 and the lower star frame 3 of the reactor coil 2 connect the product to the power line through the hardware busbar, which plays different roles such as reactive power compensation, inrush current suppression, harmonic filtering, current stabilization and current limiting according to the needs of the power line design. The product equalizing ring 4 is configured at both ends of the reactor to prevent the product from generating corona discharge under high electric field for a long time and causing product failure. The metal star frame and each winding layer of the reactor coil 2 are vertically tied with epoxy glass fiber tape. The wires of each winding layer are impregnated with epoxy glue, and the upper and lower ends are fastened by insulating pull rods. After high-temperature curing, it becomes a solid whole to reduce noise transmission. The coil airway support of the reactor uses modified unsaturated polyester resin pull-out rods as support between the wire packages to form a vertical heat dissipation airway; the outer surface is coated with acrylic polyurethane enamel and RTV-Ⅱ glue to protect against ultraviolet rays and reduce the probability of surface flashover in rainy climates.

Claims

1. A lightweight dry-type air-core reactor, characterized in that: It comprises an upper star frame (1), a reactor coil (2), a lower star frame (3), a grading ring (4), and a support insulator (5); An upper star frame (1) is arranged at the upper end of the reactor coil (2), and a lower star frame (3) is arranged at the lower end; voltage grading rings (4) are arranged on the upper star frame (1) and the lower star frame (3); the bottom of the lower star frame (3) is a flange; and a support insulator (5) is arranged at the bottom of the reactor coil (2); The reactor coil (2) is composed of multiple layers of cylindrical winding layers (7) connected in parallel, and a heat dissipation channel is formed by using a pull-out support bar between each winding layer (7). The winding layer (7) is a multi-layer cylindrical parallel structure, and the pull-out support bar uses a modified unsaturated polyester resin pull-out rod as a support between the coils to form a vertical heat dissipation airway, and the outer surface is coated with acrylic polyurethane enamel and RTV-Ⅱ glue; Each winding layer (7) is continuously wound with a rectangular transposed aluminum stranded wire wrapped with an insulating composite film without joints, and the outer layer of the transposed aluminum stranded wire is wrapped with 2 to 3 layers of insulating film.

2. A lightweight dry-type air-core reactor according to claim 1, characterized in that: The shape and structure of the pull-out support bar is a rectangular long strip.

3. A lightweight dry-type air-core reactor according to claim 1, characterized in that: The innermost winding layer and the outermost winding layer of the winding layer (7) are wrapped with alkali-free glass fibers impregnated with epoxy resin to form an insulating protective layer.

4. A lightweight dry-type air-core reactor according to claim 1, characterized in that: The insulated composite film-wrapped rectangular transposed aluminum stranded wire is composed of one or more aluminum stranded wires, wherein each aluminum stranded wire is formed by twisting multiple film-wrapped small round aluminum conductors, and a single small round conductor is wrapped with one or more layers of insulation film.

5. A lightweight dry-type air-core reactor according to claim 1, characterized in that: Each of the winding layers (7) is composed of a plurality of coils connected in parallel, and each coil has lead wires at both ends, and the lead wires are welded to the aluminum bars of the upper star frame (1) and the lower star frame (3) by argon arc welding; End coil pads (6) are arranged between the star frame and each coil winding layer (7), and are vertically bound by epoxy glass fiber tape.

6. A light dry-type air-core reactor according to claim 5, characterized in that: The end ring gasket (6) is made of rectangular insulating materials of different heights. The top of each end ring gasket (6) is provided with a groove for fixing the wire, and the bottom is provided with a mounting hole for fixing the aluminum bar.

7. A light dry-type air-core reactor according to claim 1, characterized in that: The upper and lower ends of each winding layer (7) are fastened and connected by combining an insulating pull rod (8) and an insulating spacer (9), and the two ends of the insulating pull rod are locked by insulating nuts (10).

8. A light dry-type air-core reactor according to claim 7, characterized in that: The insulating spacer (9) is made of rectangular insulating materials of different thicknesses. Each insulating spacer (9) is designed to be stepped according to the height of the winding layer conductors, and a mounting hole is processed in the middle.

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