A large cross-section layered combined direct current high voltage cable

Abstract

The utility model discloses a big section layering combination type direct current high -voltage cable, include: cable cover, the inside of cable cover is provided with cable conductor, the inner wall bonding of cable cover has waterproof cover, the inner wall bonding of waterproof cover has spiral copper wire cover, the inner wall bonding of spiral copper wire cover has galvanized steel band, the utility model relates to high -voltage cable technical field, this cable cover, through the setting of galvanized steel band spiral winding and spiral copper wire cover and filling cover, the mechanical strength of cable is enhanced significantly, makes cable can bear tension, pressure, distortion force and bending force, in the complex laying environment and long -term operation process, effectively resist the destruction of external force, maintain cable structure integrity, and waterproof cover is closely bonded in the inner wall of cable cover, constructs high -efficient waterproof barrier, prevents the moisture of outside from invading cable inside, avoids the insulation performance decline and metal part corrosion problem because of moisture.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage cable technology, specifically a large-section layered composite DC high-voltage cable. Background Technology

[0002] In modern power transmission systems, DC high-voltage cables are used as key equipment for long-distance, high-capacity power transmission and are widely used in new energy grid connection, urban power grid transformation and island power transmission. With the continuous growth of social electricity demand and the advancement of high-power DC transmission projects, higher requirements are placed on the performance of large-section DC high-voltage cables.

[0003] Traditional DC high-voltage cables have some shortcomings in structural design. In terms of mechanical performance, they are unable to withstand large tensile, compressive, torsional and bending forces when facing complex laying environments, such as the compression of underground pipelines, the wind pull when laying overhead, and the water flow impact when laying underwater. This can easily lead to problems such as conductor breakage and insulation damage, resulting in a shortened cable life and even safety accidents. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a large-section layered composite DC high-voltage cable, which solves the problem that traditional DC high-voltage cables are unable to withstand large tensile, compressive, torsional, and bending forces in terms of mechanical properties.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A large-section layered composite DC high-voltage cable includes: a cable sheath, the inside of which is a cable conductor; a waterproof sleeve is bonded to the inner wall of the cable sheath, a spiral copper wire sleeve is bonded to the inner wall of the waterproof sleeve, a galvanized steel strip is bonded to the inner wall of the spiral copper wire sleeve, a metal shielding sleeve is bonded to the inner wall of the galvanized steel strip, the metal shielding sleeve is made of copper alloy, has high conductivity and good electromagnetic shielding performance, and is used to shield the electromagnetic field inside the cable; a filler sleeve is bonded to the inner wall of the metal shielding sleeve.

[0009] Preferably, the galvanized steel strip is spirally wound and bonded to the outer wall of the metal shielding sleeve. Together with the spiral copper wire sleeve, it enhances the mechanical strength of the cable, enabling the cable to withstand certain tensile, compressive, torsional, and bending forces. On the other hand, it further improves the electromagnetic shielding effect, forming a double shielding structure to better protect the internal electrical performance of the cable.

[0010] Preferably, the outer wall of the cable conductor is bonded with a conductor shielding sleeve, which is made of semi-conductive shielding material, generally composed of conductive fillers such as carbon black mixed with a polymer matrix. Its function is to uniform the electric field on the conductor surface. The outer wall of the conductor shielding sleeve is bonded with an insulating sleeve, and the outer wall of the insulating sleeve is bonded with an insulating shielding sleeve. The insulating shielding sleeve is made of semi-conductive cross-linked polyethylene, which has excellent electrical insulation performance, chemical corrosion resistance and mechanical properties, and can further uniformize the electric field outside the insulation layer.

[0011] Preferably, the cable conductors are arranged in a ring array along the central point of the filling sleeve, which can achieve large cross-sectional conductivity within a limited space and meet the requirements of high current transmission.

[0012] Preferably, the inner wall of the filler sleeve is bonded to the outer wall of the insulating shield sleeve. Its function is to fill the space inside the cable and provide insulation, so that the various components are tightly combined and the overall structural stability of the cable is maintained.

[0013] (III) Beneficial Effects

[0014] This utility model provides a large-section layered composite DC high-voltage cable. It has the following advantages:

[0015] (I) The cable sheath, through the spiral winding of galvanized steel strip, the spiral copper wire sheath, and the filler sleeve, significantly enhances the mechanical strength of the cable, enabling it to withstand tensile, compressive, torsional, and bending forces. In complex laying environments and long-term operation, it effectively resists external damage, maintains the integrity of the cable structure, and extends its service life. The waterproof sleeve is tightly bonded to the inner wall of the cable sheath, forming an efficient waterproof barrier that prevents external moisture from penetrating the cable, avoiding the degradation of insulation performance and corrosion of metal components caused by moisture, and improving the applicability and reliability of the cable in harsh environments such as humid and underwater environments. Attached Figure Description

[0016] Fig. 1 This is a front view of the structure of this utility model;

[0017] Fig. 2 This is a partial cross-sectional structural diagram of the present invention;

[0018] Fig. 3 This is a schematic diagram of the overall structure of this utility model.

[0019] In the diagram: 1. Cable sheath; 2. Waterproof sheath; 3. Spiral copper wire sheath; 4. Galvanized steel strip; 5. Metal shielding sheath; 6. Filler sheath; 7. Insulating shielding sheath; 8. Insulating sheath; 9. Conductor shielding sheath; 10. Cable conductor. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figs. 1-3 This utility model provides a technical solution: a large-section layered composite DC high-voltage cable, comprising: a cable sleeve 1, with a cable conductor 10 disposed inside the cable sleeve 1; a waterproof sleeve 2 is bonded to the inner wall of the cable sleeve 1, a spiral copper wire sleeve 3 is bonded to the inner wall of the waterproof sleeve 2, a galvanized steel strip 4 is bonded to the inner wall of the spiral copper wire sleeve 3, a metal shielding sleeve 5 is bonded to the inner wall of the galvanized steel strip 4, the metal shielding sleeve 5 is made of copper alloy material, has high conductivity and good electromagnetic shielding performance, and is used to shield the electromagnetic field inside the cable; a filler sleeve 6 is bonded to the inner wall of the metal shielding sleeve 5.

[0022] The galvanized steel strip 4 is spirally wound and bonded to the outer wall of the metal shielding sleeve 5. Together with the spiral copper wire sleeve 3, it enhances the mechanical strength of the cable, enabling the cable to withstand certain tensile, compressive, torsional, and bending forces. On the other hand, it further improves the electromagnetic shielding effect, forming a double shielding structure to better protect the internal electrical performance of the cable.

[0023] The outer wall of the cable conductor 10 is bonded with a conductor shielding sleeve 9. The conductor shielding sleeve 9 is made of semi-conductive shielding material, which is generally made of conductive fillers such as carbon black mixed with a polymer matrix. Its function is to uniform the electric field on the conductor surface. The outer wall of the conductor shielding sleeve 9 is bonded with an insulating sleeve 8. The outer wall of the insulating sleeve 8 is bonded with an insulating shielding sleeve 7. The insulating shielding sleeve 7 is made of semi-conductive cross-linked polyethylene, which has excellent electrical insulation performance, chemical corrosion resistance and mechanical properties, and can further uniformize the electric field outside the insulation layer.

[0024] The cable conductor 10 is arranged in a ring array along the central point of the filling sleeve 6, which can achieve large cross-section conductivity in a limited space and meet the requirements of high current transmission.

[0025] The inner wall of the filler sleeve 6 is bonded to the outer wall of the insulating shield sleeve 7. Its function is to fill the space inside the cable and provide insulation, so that the various components are tightly combined and the overall structural stability of the cable is maintained.

[0026] In use, the cable conductor 10 is the channel for current transmission and is used to carry DC high voltage. Multiple cable conductors 10 are distributed in a ring array along the central point of the filling sleeve 6. This design can achieve large cross-section conductivity in a limited space and meet the needs of high current transmission.

[0027] The conductor shielding sleeve 9 is tightly bonded to the outer wall of the cable conductor 10. The conductor shielding sleeve 9 is made of semi-conductive shielding material, which is generally made of conductive fillers such as carbon black mixed with a polymer matrix. Its function is to uniform the electric field on the conductor surface and avoid electric field concentration. The insulating sleeve 8 provides electrical insulation, prevents current leakage, and withstands the high voltage during cable operation. The insulating shielding sleeve 7 is made of semi-conductive cross-linked polyethylene, which has excellent electrical insulation performance, chemical corrosion resistance and mechanical properties. It can further uniformize the electric field outside the insulation layer, protect the insulating sleeve 8 from external electric field interference, and also prevent the electric field inside the insulation layer from affecting the outside.

[0028] The metal shielding sleeve 5 is located outside the insulating shielding sleeve 7. The metal shielding sleeve 5 is made of copper alloy, which has high conductivity and good electromagnetic shielding performance. It is used to shield the electromagnetic field inside the cable and prevent electromagnetic interference from leaking into the external environment. At the same time, it can also prevent external electromagnetic interference from affecting the signal transmission inside the cable. The galvanized steel strip 4 is spirally wound on the outer wall of the metal shielding sleeve 5. Together with the spiral copper wire sleeve 3, it enhances the mechanical strength of the cable, enabling the cable to withstand certain tensile, compressive, torsional and bending forces. On the other hand, it further improves the electromagnetic shielding effect, forming a double shielding structure to better protect the internal electrical performance of the cable.

[0029] The waterproof sleeve 2 is bonded to the inner wall of the cable sleeve 1, which can effectively prevent external moisture from entering the cable and avoid damage to the cable's insulation performance and metal components, thereby improving the cable's reliability and service life. The filler sleeve 6 is located between the metal shielding sleeve 5 and the insulating shielding sleeve 7. Its function is to fill the space inside the cable and provide insulation, so that all components are tightly connected and the overall structural stability of the cable is maintained. As the outermost protective structure of the cable, the cable sleeve 1 provides mechanical protection for the entire cable and prevents the cable from being physically damaged by the outside world.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-section layered composite DC high-voltage cable, characterized in that, include: A cable sleeve (1) is provided inside the cable sleeve (1); The inner wall of the cable sleeve (1) is bonded with a waterproof sleeve (2), the inner wall of the waterproof sleeve (2) is bonded with a spiral copper wire sleeve (3), the inner wall of the spiral copper wire sleeve (3) is bonded with a galvanized steel strip (4), the inner wall of the galvanized steel strip (4) is bonded with a metal shielding sleeve (5), and the inner wall of the metal shielding sleeve (5) is bonded with a filler sleeve (6).

2. The large-section layered composite DC high-voltage cable according to claim 1, characterized in that: The galvanized steel strip (4) is spirally wound and bonded to the outer wall of the metal shielding sleeve (5).

3. The large-section layered composite DC high-voltage cable according to claim 1, characterized in that: The outer wall of the cable conductor (10) is bonded with a conductor shielding sleeve (9), the outer wall of the conductor shielding sleeve (9) is bonded with an insulating sleeve (8), and the outer wall of the insulating sleeve (8) is bonded with an insulating shielding sleeve (7).

4. A large-section layered composite DC high-voltage cable according to claim 1, characterized in that: The cable conductor (10) is arranged in a ring array along the central point of the filling sleeve (6).

5. A large-section layered composite DC high-voltage cable according to claim 1, characterized in that: The inner wall of the filling sleeve (6) is bonded to the outer wall of the insulating shielding sleeve (7).

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