Ultrahigh-voltage coaxial cable

Abstract

The utility model belongs to the technical field of high-voltage cables, and discloses an ultrahigh-voltage coaxial cable. The ultrahigh-voltage coaxial cable comprises an inner conductor, an insulating layer, an outer conductor, a wrapping tape and an outer sheath, both the inner conductor and the outer conductor are formed by twisting six-category soft copper wires, the diameter of each six-category soft copper wire is 0.293 mm, the inner conductor comprises 37 first independent twisting units, each first independent twisting unit comprises 60 six-category soft copper wires, and the insulating layer is arranged between the outer conductor and the outer sheath. The outer conductor comprises 28 second independent stranded units which are wound in the same direction, and each second independent stranded unit comprises 80 category 6 soft copper wires. According to the ultrahigh-voltage coaxial cable, the inner conductor and the outer conductor are formed by twisting the six types of soft copper wires, and the outer conductor is arranged in the same-direction winding mode, so that the outer conductor can have high tensile strength and can meet the bending requirement. Meanwhile, the sectional area of the inner conductor also meets the technical requirements of ultrahigh-voltage pulse power, and the instantaneous current-carrying capacity of hundreds of thousands of amperes can be met.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage cable technology, and in particular to an ultra-high-voltage coaxial cable. Background Technology

[0002] As an emerging special power supply technology, pulsed power technology can achieve energy compression and power amplification through long-term energy storage and instantaneous release. It is widely used in electromagnetic emission, strong magnetic pulse, nuclear fusion and other fields. Typically, pulsed power systems adopt a modular design and are composed of several pulsed power units. The instantaneous power is huge, and the connecting cables between the load and the energy storage module must withstand high-voltage environment and high bending. The instantaneous current carrying capacity of a single cable can reach tens of thousands or even hundreds of thousands of amperes.

[0003] However, if existing cables are designed according to the general DC cable design, the cross-sectional area will reach tens of thousands of square millimeters, resulting in a large outer diameter and mass of the cable, making it difficult to bend and unable to be used in engineering.

[0004] Therefore, there is an urgent need for an ultra-high voltage coaxial cable to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide an ultra-high voltage coaxial cable that can withstand high voltage environments, high bending, and has a high instantaneous current carrying capacity.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Ultra-high voltage coaxial cable comprises, from the inside out, an inner conductor, an insulation layer, an outer conductor, a wrapping tape, and an outer sheath, wherein:

[0008] Both the inner conductor and the outer conductor are made of type 6 soft copper wire twisted together, and each type 6 soft copper wire has a diameter of 0.293 mm.

[0009] The inner conductor comprises 37 first independent stranded units, and each first independent stranded unit comprises 60 of the six types of soft copper wires.

[0010] The outer conductor includes 28 second independent stranded units, each of which includes 80 of the six types of soft copper wires, and all the second independent stranded units are wound in the same direction.

[0011] Preferably, the strand diameter ratio α of the outer conductor is 25-30.

[0012] Preferably, the cable section diameter ratio b of the outer conductor is 30-40.

[0013] Preferably, the outer diameter of the wrapping tape is 28.0 ± 0.5 mm.

[0014] Preferably, the outer diameter of the inner conductor is 17.1 ± 0.5 mm.

[0015] Preferably, the insulating layer is made of a soft cross-linked rubber.

[0016] Preferably, the outer diameter of the insulating layer is 22.1 ± 0.5 mm, and the nominal thickness of the insulating layer is 2.5 mm.

[0017] Preferably, the outer sheath is made of polyether polyurethane.

[0018] Preferably, the nominal thickness of the outer sheath is 2.0 mm.

[0019] Preferably, the outer diameter of the ultra-high voltage coaxial cable is 32.0±1.0mm.

[0020] The beneficial effects of this invention are as follows: This ultra-high voltage coaxial cable uses Category 6 soft copper wires stranded together to form an inner and outer conductor, and a second independent stranding unit is formed in the outer conductor by unidirectional winding. This allows the outer conductor to have high tensile strength and adapt to bending requirements. Simultaneously, the cross-sectional area of ​​the inner conductor meets the pulse power technology requirements of ultra-high voltage, adapting to power transmission needs from 330kV to below 1000kV, and capable of handling instantaneous current carrying capacity of hundreds of thousands of amperes. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the ultra-high voltage coaxial cable provided in this utility model;

[0022] Figure 2 This is a schematic diagram of the strand pitch ratio 'a' of the outer conductor;

[0023] Figure 3 This is a schematic diagram of the cabling section diameter ratio b of the outer conductor.

[0024] In the picture:

[0025] 1. Inner conductor; 2. First semiconducting strip; 3. Insulating layer; 4. Second semiconducting strip; 5. Outer conductor; 6. Wrapping tape; 7. Outer sheath. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," and "abutting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] The following is based on the appendix Figures 1 to 2 This invention introduces the ultra-high voltage coaxial cable provided by this utility model.

[0031] like Figure 1As shown, specifically, this ultra-high voltage coaxial cable mainly includes an inner conductor 1, an insulation layer 3, an outer conductor 5, a wrapping tape 6, and an outer sheath 7. The inner conductor 1, as the core conductive part of the cable, is typically made of copper wire and is responsible for transmitting current or electromagnetic wave signals. The insulation layer 3 is located around the inner conductor 1 to provide electrical isolation and prevent current leakage. The outer conductor 5 is located around the insulation layer 3 and serves as both electromagnetic shielding and a short-circuit current path. The outer conductor 5 is also made of copper wire, which can confine the electric field inside the cable, reducing external interference. Furthermore, in the event of a short circuit, it can carry fault current, protecting the safety of upstream and downstream systems. The wrapping tape 6 is located outside the outer conductor 5, filling the internal gaps of the cable, maintaining its roundness, and providing mechanical support and moisture protection. The outer sheath 7 is located on the outermost layer of the cable, forming a physical and chemical protective barrier to further protect the cable's interior.

[0032] More specifically, both the inner conductor 1 and the outer conductor 5 are made of Category 6 soft copper wire stranded together. Category 6 soft copper wire is specifically designed for flexible cables, possessing high flexibility and suitable for scenarios requiring frequent or high-degree bending. In this embodiment, the diameter of the Category 6 soft copper wire is 0.293 mm. The inner conductor 1 includes 37 first independent stranded units, each containing 60 Category 6 soft copper wires. The outer conductor 5 includes 28 second independent stranded units, each containing 80 Category 6 soft copper wires, and all second independent stranded units are wound in the same direction. For example, in this embodiment, all second independent stranded units are wound either right-handed or left-handed, exhibiting structural symmetry and uniformity. This stranding method can disperse stress, increase tensile strength, improve its resistance to electromagnetic forces and current carrying capacity, enhance operational safety, and prevent the sheath from deforming and bursting when the cable is bent, thereby further improving the overall service life of the cable in scenarios requiring frequent or high-degree bending.

[0033] This ultra-high voltage coaxial cable uses Category 6 soft copper wires stranded together to form an inner conductor 1 and an outer conductor 5. A second independent stranded unit is formed within the outer conductor 5 by unidirectional winding, giving it high tensile strength and adaptability to bending requirements. Simultaneously, the cross-sectional area of ​​the inner conductor 1 meets the pulse power technology requirements of ultra-high voltage, adapting to power transmission needs from 330kV to below 1000kV, and capable of handling instantaneous current carrying capacity of hundreds of thousands of amperes.

[0034] Preferably, the ultra-high voltage coaxial cable also includes a first semiconducting strip 2 and a second semiconducting strip 4. The first semiconducting strip 2 is disposed between the inner conductor 1 and the insulation layer 3, and the second semiconducting strip 4 is disposed between the insulation layer 3 and the outer conductor 5. The first semiconducting strip 2 serves as a shielding layer for the inner conductor 1, eliminating the risk of electric field concentration and air gap discharge on the surface of the inner conductor 1. Specifically, after stranding, the surface of the inner conductor 1 may have burrs or unevenness. The first semiconducting strip 2, by closely adhering to the conductor and being at the same potential, uniformly distributes the electric field, preventing partial discharge and insulation breakdown. The second semiconducting strip 4 can uniformly distribute the electric field on the outer surface of the insulation layer 3, preventing air gap discharge between the insulation layer 3 and the outer conductor 5.

[0035] It should be noted that in this embodiment, the outer diameter of the ultra-high voltage coaxial cable is 32.0±1.0mm. Compared with a cable with the same power transmission capacity designed according to a general DC cable, the ultra-high voltage coaxial cable in this embodiment has a smaller cross-sectional area and can better adapt to scenarios with frequent bending or high bending.

[0036] For example, in this embodiment, the outer diameter of the inner conductor 1 is 17.1 ± 0.5 mm. That is, after the inner conductor 1 is stranded, the total diameter formed by wrapping the first semiconducting strip 2 around the wire core or cable core in a spiral shape is 17.1 ± 0.5 mm to meet the adaptation requirements of subsequent processes. This arrangement can meet the pulse power technology requirements of ultra-high voltage and reserve sufficient space for the setting of structures such as the insulation layer 3 and the outer conductor 5.

[0037] The insulating layer 3 is preferably made of soft cross-linked rubber, possessing excellent electrical properties, heat aging resistance, ozone resistance, weather resistance, corona resistance, corrosion resistance, and processability. Its low-temperature resistance can reach -40℃, its long-term operating temperature is 90℃, its short-circuit operating temperature is 250℃, and its short-time operating temperature is 130℃. In this embodiment, the outer diameter of the insulating layer 3 is 22.1±0.5mm, and the nominal thickness of the insulating layer 3 is 2.5mm, to meet the insulation requirements for ultra-high voltage pulse power transmission.

[0038] Preferably, such as Figure 2 As shown, in this embodiment, the strand pitch ratio of the outer conductor 5 is 25-30, meaning the ratio of the strand pitch to the diameter of the Category 6 soft copper wire in each second independent stranding unit is between 25 and 30. When the strand pitch ratio of the outer conductor 5 is between 25 and 30, the degree of stranding is smaller, the structure is relatively looser, and there are more gaps between adjacent Category 6 soft copper wires, making the outer conductor 5 more flexible, suitable for scenarios requiring frequent bending, and achieving better mechanical strength.

[0039] When the strand pitch ratio is less than 25, the cable's flexibility decreases, making it unsuitable for high-degree bending or frequent bending. Conversely, when the strand pitch ratio is greater than 30, the overall resistance increases, reducing conductivity stability. Optionally, in this embodiment, the strand pitch ratio can be 25, 26, 27, 28, 29, 30, etc., and this invention does not impose a specific limitation on it.

[0040] Furthermore, such as Figure 3 As shown, in this embodiment, the cabling pitch ratio b of the outer conductor 5 is 30-40, which is the ratio of the cabling pitch to the outer diameter of the second independent stranding unit of the outer conductor 5. When the cabling pitch ratio is 30-40, the stranding pitch is longer and the gap is larger, making the cable more flexible after cabling, thus adapting to usage scenarios with high bending or frequent bending.

[0041] Furthermore, in this embodiment, the wrapping tape 6 is disposed on the outside of the outer conductor 5, and its outer diameter is 28.0±0.5mm. The wrapping tape 6 can fill the space between the outer conductor 5 and the sheath, thereby ensuring the roundness of the cable. Specifically, the wrapping tape 6 can be made of polypropylene tape, non-woven fabric, aluminum-plastic composite tape, etc., and this utility model does not make specific limitations on it.

[0042] Continue to refer to Figure 1 As shown, the outer sheath 7 is located on the outermost side of the ultra-high voltage coaxial cable and is made of polyether polyurethane. Polyether polyurethane has a low specific gravity and high mechanical strength, giving the outer sheath 7 properties such as oil resistance, ozone resistance, abrasion resistance, hydrolysis resistance, corrosion resistance, and low-temperature resistance. It can withstand low temperatures and can be used normally at an ambient temperature of -50℃. Optionally, in this embodiment, the nominal thickness of the outer sheath 7 is 2.0mm, which is sufficient to protect the internal structure and will not negatively affect the bending of the cable.

[0043] 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 various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. 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 this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An ultra-high voltage coaxial cable, characterized by, It includes an inner conductor (1), an insulating layer (3), an outer conductor (5), a wrapping tape (6), and an outer sheath (7) arranged from the inside out, wherein: Both the inner conductor (1) and the outer conductor (5) are made of type 6 soft copper wire twisted together, and each type 6 soft copper wire has a diameter of 0.293 mm. The inner conductor (1) comprises 37 first independent stranded units, each of which comprises 60 of the six types of soft copper wires. The outer conductor (5) includes 28 second independent stranded units, each of which includes 80 of the six types of soft copper wires, and all the second independent stranded units are wound in the same direction.

2. The ultra-high voltage coaxial cable according to claim 1, characterized in that, The strand diameter ratio a of the outer conductor (5) is 25-30.

3. The ultra-high voltage coaxial cable according to claim 2, characterized in that, The cable section diameter ratio b of the outer conductor (5) is 30-40.

4. The ultra-high voltage coaxial cable according to claim 3, characterized in that, The outer diameter of the wrapping tape (6) is 28.0 ± 0.5 mm.

5. The ultra-high voltage coaxial cable according to claim 4, characterized in that, The outer diameter of the inner conductor (1) is 17.1 ± 0.5 mm.

6. The ultra-high voltage coaxial cable according to claim 5, characterized in that, The insulating layer (3) is made of soft cross-linked rubber.

7. The ultra-high voltage coaxial cable according to claim 6, characterized in that, The outer diameter of the insulating layer (3) is 22.1±0.5mm, and the nominal thickness of the insulating layer (3) is 2.5mm.

8. The ultra-high voltage coaxial cable according to claim 7, characterized in that, The outer sheath (7) is made of polyether polyurethane.

9. The ultra-high voltage coaxial cable according to claim 7, characterized in that, The nominal thickness of the outer sheath (7) is 2.0 mm.

10. The ultra-high voltage coaxial cable according to any one of claims 1-9, characterized in that, The outer diameter of the ultra-high voltage coaxial cable is 32.0±1.0mm.

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