Full-insulated flat transposed aluminum conductor for high-voltage shunt reactor

Abstract

The utility model discloses a kind of full-insulation flat transposed aluminum conductors for high-voltage shunt reactors, belong to the technical field of electromagnetic wire, the aluminum conductor includes transposed line, after combination, multiple transposed lines are coated with multiple second film layers on its outer surface to form a combination line, the outer surface of combination line is bonded with polyimide film. In the coil curing, the adhesive on the polyimide film is activated and forms a permanent bond, improves the power frequency withstand voltage and breakdown voltage level, while enhancing the tightness of the overall structure, preventing moisture intrusion and surface creepage, solving the problems in the background art, providing excellent insulation reliability and electrical performance improvement, unlike ordinary film, its self-adhesive property forms an "integrated" structure after curing.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic wire technology, and in particular relates to fully insulated flat transposed aluminum conductors for high-voltage parallel reactors. Background Technology

[0002] In high-voltage, ultra-high-voltage, and extra-high-voltage transmission systems, line capacitance generates a large amount of capacitive reactive power, leading to voltage increases and affecting the stability of the power system. Dry-type high-voltage shunt reactors of 500kV and above can be used for reactive power regulation, absorbing excess capacitive reactive power, solving the problems of excess reactive power and high voltage in the power grid, and improving the stability of the power system.

[0003] The core component of this type of reactor is the winding conductor, which must meet the following stringent requirements:

[0004] (1) Electrical performance: withstands high power frequency voltage and operating overvoltage, and avoids partial discharge or insulation breakdown;

[0005] (2) Structural stability: After being wound into a coil, it needs to be solidified and shaped to prevent deformation or displacement due to vibration during operation.

[0006] However, traditional high-voltage reactor conductors have significant shortcomings:

[0007] (1) Poor insulation reliability: The multilayer insulating film is only physically covered and stacked. During the winding and curing process, micro gaps are easily generated due to thermal expansion and contraction, resulting in surface creep or insufficient power frequency withstand voltage.

[0008] (2) Loose structure: After the coil is cured, the wires of each layer are not firmly bonded. During operation, noise is generated due to electromagnetic vibration, and insulation wear is easily caused by displacement.

[0009] Therefore, there is an urgent need to design fully insulated flat transposed aluminum conductors for high-voltage parallel reactors to solve the problems mentioned above. Utility Model Content

[0010] The purpose of this invention is to provide a fully insulated flat transposed aluminum conductor for high-voltage parallel reactors, which has the advantages of high insulation reliability and stable structure, and solves the problems mentioned in the background art.

[0011] To achieve the above objectives, the specific technical solution for the fully insulated flat transposed aluminum conductor used in the high-voltage parallel reactor of this utility model is as follows:

[0012] The high-voltage shunt reactor uses fully insulated flat transposed aluminum conductors, including transposed wires. Multiple transposed wires are combined and coated with multiple layers of second film to form a combined wire. The outer surface of the combined wire is bonded with a polyimide film so that the adhesive on the polyimide film is activated and forms a permanent bond when the coil is cured.

[0013] Furthermore, the outer surface of the polyimide film is coated with a polyester-glass blended tape to form a protective layer.

[0014] Furthermore, the transposition line comprises multiple thin-film wrapped round aluminum wires. After transposition, combination and shaping, the multiple thin-film wrapped round aluminum wires are coated with multiple layers of first thin film to form the transposition line.

[0015] Furthermore, by swapping the positions of multiple thin-film wrapped round aluminum wires, the multiple thin-film wrapped round aluminum wires are repositioned, thereby reducing eddy current losses and skin effect.

[0016] Furthermore, multiple transposed thin-film-wrapped round aluminum wires are combined to increase the conductor cross-sectional area and enhance current carrying capacity.

[0017] Furthermore, the combined film is pressed into a first shape around the round aluminum wire to facilitate tight winding in the reactor coil.

[0018] Furthermore, multiple layers of the first thin film are coated on the outer surface of the shaped thin film surrounding the round aluminum wire to form a transposition line.

[0019] Furthermore, the polyimide film is a single-sided self-adhesive polyimide film, and an adhesive layer is provided on the single-sided self-adhesive polyimide film. The polyimide film is bonded to the outer surface of the assembly line through the adhesive layer.

[0020] This invention has the following advantages: during coil curing, the adhesive on the polyimide film is activated and forms a permanent bond, improving the power frequency withstand voltage and breakdown voltage levels, while enhancing the overall structural tightness, preventing moisture intrusion and surface creep, solving the problems in the prior art, and providing excellent insulation reliability and improved electrical performance. Unlike ordinary films, its self-adhesive properties form an "integrated" structure after curing. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the aluminum conductor of this utility model;

[0022] The markings in the diagram are as follows: 1. Combination line; 11. Transposition line; 111. Film-wrapped round aluminum wire; 112. First film layer; 12. Second film layer; 2. Polyimide film; 3. Polyester-glass blended tape. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] 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 this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0025] The following is a reference to the appendix. Figure 1 This invention describes a fully insulated flat transposed aluminum conductor for a high-voltage shunt reactor.

[0026] Traditional high-voltage reactor conductors have significant shortcomings:

[0027] (1) Poor insulation reliability: The multilayer insulating film is only physically covered and stacked. During the winding and curing process, micro gaps are easily generated due to thermal expansion and contraction, resulting in surface creep or insufficient power frequency withstand voltage.

[0028] (2) Loose structure: After the coil is cured, the wires of each layer are not firmly bonded. During operation, noise is generated due to electromagnetic vibration, and insulation wear is easily caused by displacement.

[0029] Therefore, the aluminum conductor used in this high-voltage parallel reactor includes a transposed wire 11. After multiple transposed wires 11 are combined, multiple layers of second film 12 are coated on their outer surface to form a combined wire 1. A polyimide film 2 is bonded to the outer surface of the combined wire 1. When the coil is cured, the adhesive on the polyimide film 2 is activated and forms a permanent bond, which improves the power frequency withstand voltage and breakdown voltage level, while enhancing the overall structural tightness, preventing moisture intrusion and surface creep, solving the problems in the prior art, and providing excellent insulation reliability and improved electrical performance. Unlike ordinary films, its self-adhesive properties form an "integrated" structure after curing.

[0030] Preferably, the second thin film layer 12 has three layers to further enhance the overall insulation and mechanical protection. In other embodiments of this utility model, other numbers of layers may also be applied, which can be set according to the actual situation.

[0031] Specifically, the outer surface of the polyimide film 2 is covered with a polyester-glass blended tape 3 to form a protective layer. The polyester-glass blended tape 3, as the outermost covering, provides mechanical strength, thermal stability, and final insulation to ensure the durability of the conductor during winding, transportation, and operation, while reducing overall noise. The polyester-glass blended tape 3 is woven from a blend of polyester (polyester) and glass fiber, and is resistant to high temperatures, tensile strength, and abrasion, protecting the inner layers from physical damage and environmental factors.

[0032] The transposition line 11 includes multiple thin-film wrapped round aluminum wires 111. After transposition, combination and shaping, the multiple thin-film wrapped round aluminum wires 111 are covered with multiple layers of first thin film 112 to form the transposition line 11. By covering the multiple thin-film wrapped round aluminum wires 111 after transposition, combination and shaping with second thin film 12, a primary insulation barrier is provided to prevent electrical breakdown.

[0033] Specifically, both the first film layer 112 and the second film layer 12 can be polyester film or polyimide film 2, with a thickness of about 0.11-0.15 mm, and have high dielectric strength, heat resistance and flexibility.

[0034] Preferably, the first thin film layer 112 consists of two layers, providing the main insulating barrier to prevent electrical breakdown. In other embodiments of this invention, other layers may be applied, which can be set according to actual conditions.

[0035] The first thin film layer 112 serves as an intermediate insulating layer, bearing the working voltage, isolating the internal strands, and reducing the risk of partial discharge. The second thin film layer 12 provides redundant insulation for the composite line 1 structure, ensuring multi-layer protection under high voltage.

[0036] Transposition: By exchanging the positions of multiple thin-film wrapped round aluminum wires 111, the multiple thin-film wrapped round aluminum wires 111 are transposed, thereby reducing eddy current loss and skin effect, ensuring that the current is evenly distributed in the conductor cross-section, thereby improving the efficiency and thermal stability of the conductor.

[0037] Assembly: Multiple transposed thin-film wrapped round aluminum wires 111 are combined to increase the cross-sectional area of ​​the conductor and improve the current carrying capacity. The assembly process ensures that the strands are closely arranged and the gaps are reduced to form a larger conductor to meet the high current requirements of high voltage reactors.

[0038] Shaping: The combined film-wrapped round aluminum wire 111 is pressed into a first shape so that it can be tightly wound in the reactor coil, improving space utilization and heat dissipation efficiency.

[0039] Preferably, the first shape is flat to optimize the coil structure, enhance mechanical stability, and reduce vibration and noise during operation. In other embodiments of this utility model, it can also be other shapes such as rectangle, as long as it can be easily wound tightly in the reactor coil.

[0040] Multiple layers of first film 112 are coated on the outer surface of the shaped film-wrapped round aluminum wire 111 to form the transposition line 11.

[0041] Furthermore, the polyimide film 2 is a single-sided self-adhesive polyimide film 2, and an adhesive layer is provided on the single-sided self-adhesive polyimide film 2. The polyimide film 2 is bonded to the outer surface of the assembly line 1 through the adhesive layer.

[0042] Taking this utility model for manufacturing a dry-type hollow high-voltage parallel reactor as an example:

[0043] The monofilament aluminum wire has a conductor diameter of 1.98mm, and the film layer is covered with two layers of polyimide film and polyester film, with a thickness of 0.15mm.

[0044] A single cable uses 34 monofilament aluminum wires, and the first film layer 112 is covered with two layers of polyimide film.

[0045] The composite cable consists of four single cables. The second film layer 12 is covered with three layers of polyimide film and polyester film, followed by one layer of single-sided self-adhesive polyimide film, and then the outermost layer of polyester-glass hybrid woven tape 3 is covered with a thickness of 0.89mm.

[0046] This invention relates to a fully insulated flat transposed aluminum conductor for high-voltage parallel reactors. After the winding coil is cured, it can improve the conductor's power frequency withstand voltage and breakdown voltage levels, effectively prevent creepage phenomena that may occur when carrying large currents, reduce the overall operating noise of the reactor, and ensure the safe and stable operation of the conductor in high-voltage, high-current environments.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A fully insulated flat transposed aluminum conductor for a high-voltage shunt reactor, characterized in that, It includes transposition lines. Multiple transposition lines are combined and then coated with multiple layers of second film to form a composite line. The outer surface of the composite line is bonded with a polyimide film so that the adhesive on the polyimide film is activated and forms a permanent bond when the coil is cured.

2. The fully insulated flat transposed aluminum conductor for high-voltage parallel reactors according to claim 1, characterized in that, The outer surface of the polyimide film is covered with a polyester-glass blended tape to form a protective layer.

3. The fully insulated flat transposed aluminum conductor for high-voltage parallel reactors according to claim 1, characterized in that, The transposition line consists of multiple thin-film wrapped round aluminum wires. After transposition, combination and shaping, the multiple thin-film wrapped round aluminum wires are coated with multiple layers of first thin film to form the transposition line.

4. The fully insulated flat transposed aluminum conductor for high-voltage parallel reactors according to claim 3, characterized in that, By swapping the positions of multiple thin-film wrapped aluminum wires, the eddy current loss and skin effect can be reduced.

5. The fully insulated flat transposed aluminum conductor for high-voltage parallel reactors according to claim 3, characterized in that, Multiple transposed thin-film wrapped round aluminum wires are combined to increase the conductor cross-sectional area and improve current carrying capacity.

6. The fully insulated flat transposed aluminum conductor for high-voltage shunt reactors according to claim 3, characterized in that, The combined film is wrapped around a round aluminum wire and pressed into a first shape so that it can be tightly wound in the reactor coil.

7. The fully insulated flat transposed aluminum conductor for high-voltage shunt reactors according to claim 6, characterized in that, Multiple layers of the first thin film are coated on the outer surface of the shaped aluminum wire to form a transposition line.

8. The fully insulated flat transposed aluminum conductor for high-voltage parallel reactors according to claim 1, characterized in that, The polyimide film is a single-sided self-adhesive polyimide film with an adhesive layer. The polyimide film is bonded to the outer surface of the assembly line through the adhesive layer.

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