Copper core special-shaped monofilament conductor power cable

Abstract

The utility model discloses a copper core special-shaped monofilament conductor power cable, which comprises a cable conductor, the cable conductor comprises a circular monofilament, a plurality of first fan-shaped monofilaments, a plurality of second fan-shaped monofilaments and a plurality of third fan-shaped monofilaments, the first fan-shaped monofilaments are arranged on the outer side of the circular monofilament to form a first circular ring structure, and the second fan-shaped monofilaments are arranged on the outer side of the circular monofilament to form a second circular ring structure. The multiple second fan-shaped monofilaments are arranged on the outer side of the first circular ring structure to form a second circular ring structure, and the multiple third fan-shaped monofilaments are arranged on the outer side of the second circular ring structure to form a third circular ring structure. By changing the shape of the original circular monofilament, the situation that the resistivity of the monofilament is increased due to excessive deformation of the copper monofilament caused by extrusion is reduced; and meanwhile, through regular and tight arrangement and twisting during wire twisting, the compression coefficient of the conductor is improved, so that the direct-current resistance of the conductor is integrally reduced, and the current-carrying capacity and the operation safety of the cable are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a copper core special-shaped single-filament conductor power cable. Background Art

[0002] The safe operation of cables and the guarantee of power supply have become a livelihood issue that the whole society attaches great importance to after the Xi'an Aokai Cable incident. Therefore, as an enterprise serving the power grid and responsible for thousands of families, Kebao Cable produces cables that meet the State Grid's high-quality equipment standards, State Grid's solidification standards, and China Southern Power Grid's standards, which are far higher than national standards. However, for cables, the core is the cable conductor.

[0003] The current cable conductors are based on GBT 3956-2008 "Cable Conductors". This standard has clearly classified cable conductors and stipulated different standard requirements according to different performance and application conditions. However, the second type of stranded conductor is the most widely used.

[0004] Most of the current cable conductors are twisted with round single wires. This type of cable conductor structure will increase the resistivity of the single wire due to excessive deformation due to extrusion. Utility Model Content

[0005] The utility model aims to provide a copper core special-shaped monofilament conductor power cable, which reduces the situation that the copper monofilament is deformed excessively due to extrusion and increases the resistivity of the monofilament by changing the shape of the original round monofilament; at the same time, the conductor is twisted through regular and tight arrangement during twisting, so as to improve the compression coefficient of the conductor, thereby reducing the DC resistance of the conductor as a whole, and improving the current carrying capacity and operation safety of the cable.

[0006] In order to achieve the above purpose, the technical solutions adopted are as follows:

[0007] A copper core special-shaped monofilament conductor power cable comprises a cable conductor, wherein the cable conductor comprises a round monofilament, a first fan-shaped monofilament, a second fan-shaped monofilament and a third fan-shaped monofilament, wherein the first fan-shaped monofilament is arranged in plurality and all are arranged on the outside of the round monofilament to form a first circular ring structure, the second fan-shaped monofilament is arranged in plurality and all are arranged on the outside of the first circular ring structure to form a second circular ring structure, the third fan-shaped monofilament is arranged in plurality and all are arranged on the outside of the second circular ring structure to form a third circular ring structure, the size of the third fan-shaped monofilament is larger than the size of the second fan-shaped monofilament, and the size of the second fan-shaped monofilament is larger than the size of the first fan-shaped monofilament.

[0008] Furthermore, the plurality of first fan-shaped monofilaments in the first circular ring structure are connected to each other in pairs.

[0009] Furthermore, the plurality of second fan-shaped monofilaments in the second circular ring structure are connected to each other in pairs.

[0010] Furthermore, the plurality of third fan-shaped monofilaments in the third circular ring structure are connected to each other in pairs.

[0011] Furthermore, the first circular ring structure, the second circular ring structure and the third circular ring structure are all concentric with the circular monofilament.

[0012] Furthermore, the number of the first fan-shaped monofilaments is 6.

[0013] Furthermore, the number of the second fan-shaped monofilaments is 9.

[0014] Furthermore, the number of the third fan-shaped monofilaments is set to 12.

[0015] Furthermore, it also includes a mineral insulating mica tape, a wrapped phlogopite tape, a metal aluminum tape, a halogen-free low-smoke polyolefin shaped sleeve, a fireproof mud magnesium hydroxide layer, a flame-retardant low-smoke halogen-free tape and a halogen-free low-smoke polyolefin sheath, which are connected in sequence from the inside to the outside. The mineral insulating mica tape is arranged on the outside of the cable conductor.

[0016] Furthermore, the outer diameter ratio of the cable conductor to the mineral insulating mica tape is 1:1 to 1.5.

[0017] The beneficial effects of the utility model are:

[0018] 1. Since the cross section of the fan-shaped monofilament is increased, the number of monofilaments can be reduced while ensuring the conductor cross section, thus reducing labor costs. Monofilament molding can reduce the burr problem caused by mold scratches.

[0019] 2. Effective control of the cross section. While ensuring that the conductor resistance is qualified, the conductor cross section is reduced by more than 2%, saving a large amount of copper resources; the outer diameter of the conductor is reduced, thereby reducing the amount of insulating materials, wrapping materials, filling materials, and outer protection materials.

[0020] 3. The conductor resistance is stable. Since the conductor compression coefficient reaches above 0.98, the copper material inside the cable conductor is difficult to contact the moisture in the air, reducing the risk of conductor oxidation. During the long-term use or storage of the cable, the resistance can still be stable within the internal control standard at the time of initial measurement;

[0021] 4. The conductor has complete water-blocking function. The cable conductor can fully meet the requirements of longitudinal water-blocking in the GB / T 12706.2-2020 standard, and completely control and block the extension of water in the conductor.

[0022] 5. The utility model not only has strong fireproof performance, but also has reliable insulation. The mica tape insulation can make the rated voltage level of the cable reach 0.6 / 1kV, and its fastening performance is better than that of steel belt armored cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A cross-sectional view of a cable conductor of a copper core special-shaped single-filament conductor power cable according to an embodiment of the utility model is shown.

[0024] Figure 2 A schematic structural diagram of a copper core special-shaped single-filament conductor power cable according to an embodiment of the utility model is shown.

[0025] Reference numerals:

[0026] 100. Cable conductor; 101. Round monofilament; 102. First fan-shaped monofilament; 103. Second fan-shaped monofilament; 104. Third fan-shaped monofilament; 105. First circular ring structure; 106. Second circular ring structure; 107. Third circular ring structure; 200. Mineral insulating mica tape; 300. Wrapped phlogopite tape; 400. Metal aluminum tape; 500. Halogen-free and low-smoke polyolefin shaped sheath; 600. Fireproof mud magnesium hydroxide layer; 700. Flame-retardant low-smoke and halogen-free tape; 800. Halogen-free and low-smoke polyolefin sheath. DETAILED DESCRIPTION

[0027] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0028] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The specific implementation of the utility model is further described in detail below in conjunction with the drawings and embodiments.

[0031] The utility model provides a copper core special-shaped single-filament conductor power cable, such as Figure 1 As shown, the core improvement of the copper core special-shaped single-filament conductor power cable lies in the improvement of the cable conductor. For details, please refer to Figure 1 As shown, it includes a cable conductor 100, and the cable conductor 100 includes a round monofilament 101, a first fan-shaped monofilament 102, a second fan-shaped monofilament 103 and a third fan-shaped monofilament 104. The first fan-shaped monofilament 102 is set as a plurality and all are set on the outside of the round monofilament 101 to form a first circular ring structure 105. The second fan-shaped monofilament 103 is set as a plurality and all are set on the outside of the first circular ring structure to form a second circular ring structure 106. The third fan-shaped monofilament 104 is set as a plurality and all are set on the outside of the second circular ring structure 106 to form a third circular ring structure 107. The size of the third fan-shaped monofilament 104 is larger than the size of the second fan-shaped monofilament 103, and the size of the second fan-shaped monofilament 103 is larger than the size of the first fan-shaped monofilament 102.

[0032] Compared with the conventional cable conductor formed by twisting only round monofilaments 101, the present embodiment retains only the innermost round monofilament 101, and twists three first fan-shaped monofilaments 102, second fan-shaped monofilaments 103 and third fan-shaped monofilaments 104 with increasing sizes in sequence outside the monofilament, thereby forming a first circular ring structure 105, a second circular ring structure 106 and a third circular ring structure 107. Among them, the multiple first fan-shaped monofilaments 102 in the first circular ring structure 105 are connected to each other in pairs, the multiple second fan-shaped monofilaments 103 in the second circular ring structure 106 are connected to each other in pairs, and the multiple third fan-shaped monofilaments 104 in the third circular ring structure 107 are connected to each other in pairs. In addition, the first circular ring structure 105, the second circular ring structure 106 and the third circular ring structure 107 are all concentric with the round monofilament 101.

[0033] In this embodiment, the number of the first fan-shaped monofilaments 102, the second fan-shaped monofilaments 103 and the third fan-shaped monofilaments 104 increases in equal numbers. Figure 1As shown, the number of the first fan-shaped monofilament 102, the second fan-shaped monofilament 103 and the third fan-shaped monofilament 104 can be set to 6, 9 and 12. Of course, the number of the first fan-shaped monofilament 102, the second fan-shaped monofilament 103 and the third fan-shaped monofilament 104 can also be set to 3, 6 and 9, and the specific number is not limited in this embodiment.

[0034] refer to Figure 1 The structure of the cable conductor 100 shown has some structural changes. When preparing it, the following issues should be noted:

[0035] 1. Copper monofilament drawing problem: The previous cable conductors were twisted with round monofilaments, which are relatively easy to draw and anneal. For fan-shaped monofilaments, both the angle and direction of the monofilaments must be correct. The angle of each mold should be kept on the same horizontal line (same bottom and same height). In terms of mold materials, extremely high-precision CDR materials must be selected to avoid monofilament burrs.

[0036] 2. Single wire annealing: The cross-section of the fan-shaped single wire is generally larger, equivalent to the diameter of the round single wire of 3.0mm and above, which has extremely high requirements for equipment annealing. Strict control is required in terms of heat preservation and annealing. The resistivity should be ≤0.01704Ω·m.

[0037] 3. Conductor twisting: When twisting conductors, the angles of the single wires must match, and the main line cannot jump strands or curl up. The inner conductor pitch is controlled at 30-35 times the outer diameter, and the outer mold conductor pitch is controlled at 15-18 times the outer diameter, so that the conductor compression coefficient reaches 0.98. The stranding mold must be made of extremely high-precision CDR material to prevent conductor burrs.

[0038] 4. Resistance measurement: Due to the particularity of the fan-shaped conductor, a large amount of frictional heat is generated when the conductor is twisted. This part of the heat cannot be dissipated for a relatively long time, and the effect of constant temperature resistance detection cannot be achieved. This requires that the overall temperature be lowered for 15 minutes when measuring resistance, and then constant temperature measurement is performed on the fixture, so that the resistance can be accurately measured in a short and reasonable time.

[0039] Embodiment 2:

[0040] The utility model provides a copper core special-shaped single-filament conductor power cable, such as Figure 2 As shown, the copper core special-shaped single-filament conductor power cable includes a cable conductor 100, a mineral insulated mica tape 200, a wrapped phlogopite tape 300, a metal aluminum tape 400, a halogen-free low-smoke polyolefin special-shaped sheath 500, a fireproof mud magnesium hydroxide layer 600, a flame-retardant low-smoke halogen-free tape 700 and a halogen-free low-smoke polyolefin sheath 800 which are connected in sequence from the inside to the outside.

[0041] It should be noted that the structure of the cable conductor 100 is consistent with the description in Example 1 and will not be repeated here.

[0042] The copper core special-shaped single-filament conductor power cable is designed with mineral insulated mica tape 200 and wrapped phlogopite tape 300, so that the rated voltage level of the cable can reach 0.6 / 1kV, and the insulation is reliable. The combined structural design of halogen-free low-smoke polyolefin special-shaped sheath 500, fire-proof mud magnesium hydroxide layer 600, flame-retardant low-smoke halogen-free tape 700 and halogen-free low-smoke polyolefin sheath 800 makes it have excellent fireproof and waterproof properties. At the same time, the fastening performance of the overall structure is better than that of steel belt armored cable.

[0043] Exemplarily, this embodiment provides specific structural dimension parameters of the copper core special-shaped single-filament conductor power cable, as shown in Table 1.

[0044] Table 1. Cable size parameters

[0045] Structural elements Thickness / mm Outer diameter / mm Cable conductor —— 23.4 Mineral Insulation Mica Tape 0.2 26.2 Wrapped Phlogopite Tape 0.2 27.9 Aluminum Strip 1.0 32.0 Halogen-free low-smoke polyolefin profiled sleeve 1.5 35.0 Fireproof mud magnesium hydroxide layer 2.0 39.0 Flame retardant low smoke halogen free tape 0.2 39.8 Halogen-free low-smoke polyolefin sheath 2.3 44.4

[0046] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The scope of patent protection of the present invention should be limited by the claims.

Claims

1. A copper core special-shaped single-filament conductor power cable, characterized in that: The cable conductor includes a round monofilament, a first fan-shaped monofilament, a second fan-shaped monofilament and a third fan-shaped monofilament, wherein the first fan-shaped monofilament is provided in plurality and all are provided on the outside of the round monofilament to form a first circular ring structure, the second fan-shaped monofilament is provided in plurality and all are provided on the outside of the first circular ring structure to form a second circular ring structure, the third fan-shaped monofilament is provided in plurality and all are provided on the outside of the second circular ring structure to form a third circular ring structure, the size of the third fan-shaped monofilament is larger than the size of the second fan-shaped monofilament, and the size of the second fan-shaped monofilament is larger than the size of the first fan-shaped monofilament; It also includes a mineral insulating mica tape, a wrapped phlogopite tape, a metal aluminum tape, a halogen-free and low-smoke polyolefin shaped sleeve, a fire-proof mud magnesium hydroxide layer, a flame-retardant low-smoke halogen-free tape and a halogen-free and low-smoke polyolefin sheath, which are connected in sequence from the inside to the outside. The mineral insulating mica tape is arranged on the outside of the cable conductor.

2. The copper core special-shaped single-filament conductor power cable according to claim 1, characterized in that: The plurality of first fan-shaped monofilaments in the first circular ring structure are connected to each other in pairs.

3. The copper core special-shaped single-filament conductor power cable according to claim 1, characterized in that: The plurality of second fan-shaped monofilaments in the second circular ring structure are connected to each other in pairs.

4. The copper core special-shaped single-filament conductor power cable according to claim 1, characterized in that: The plurality of third fan-shaped monofilaments in the third circular ring structure are connected to each other in pairs.

5. The copper core special-shaped single-filament conductor power cable according to claim 1, characterized in that: The first circular ring structure, the second circular ring structure and the third circular ring structure are all concentric with the circular monofilament.

6. The copper core special-shaped single-filament conductor power cable according to claim 1, characterized in that: The number of the first fan-shaped monofilaments is 6.

7. The copper core special-shaped single-filament conductor power cable according to claim 1, characterized in that: The number of the second fan-shaped monofilaments is 9.

8. The copper core special-shaped single-filament conductor power cable according to claim 1, characterized in that: The number of the third fan-shaped monofilaments is 12.

9. The copper core special-shaped single-filament conductor power cable according to claim 1, characterized in that: The outer diameter ratio of the cable conductor to the mineral insulating mica tape is 1:1 to 1.5.

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