Special-shaped medium-voltage cable

Abstract

The utility model provides a special-shaped medium-voltage cable. The special-shaped medium-voltage cable comprises a cable body and a protective sleeve arranged on the outer surface of the cable body, through the arrangement of the inner shielding layer and the outer shielding layer, signal interference among the wire cores is effectively avoided, signal interference of the outside to the wire cores can also be shielded, and the signal transmission quality is effectively improved; meanwhile, the waterproof layer, the flame-retardant layer and the heat dissipation layer are arranged, so that the waterproof, flame-retardant and heat dissipation performance of the cable is guaranteed, the cable is made to adapt to various working environments, safety accidents are reduced when the cable is used, the use safety of the cable is effectively guaranteed, and the service life of the cable is prolonged; and finally, a fluorescent agent and a coloring agent are added into the cooling liquid, so that the cooling liquid with the coloring agent and the fluorescent agent flows out when the cable burns or is stretched and torn to cause damage to the protective sleeve, warning is provided for related personnel in time, safety accidents are avoided, and the use safety of the cable is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable manufacturing technical field especially is a kind of special-shaped medium voltage cable. BACKGROUND

[0002] Medium voltage cable usually refers to power cable with rated voltage between 1kV and 35kV, which is used for power transmission and distribution under medium current or medium voltage level. The application range of medium voltage cable is very wide, almost covering all fields requiring power transmission and distribution.

[0003] Therefore, during use, it is necessary to ensure stable operation and safe use of medium voltage cable under different working environments. In actual application, the safety problems often encountered by medium voltage cable come from two aspects. On the one hand, the cable is wet inside due to excessive humidity of working environment, which leads to decline of insulation performance of insulation layer, and the heat of cable cannot be dissipated in time, which leads to temperature rise of cable and causes insulation aging, and further causes short circuit and other faults. On the other hand, the cable sheath is damaged due to external fire burning or excessive stretching, sheath aging, which leads to power interruption or leakage and causes safety accidents.

[0004] Therefore, it is necessary to provide a special-shaped medium voltage cable with good safety performance and capable of discovering damage of cable sheath in time. SUMMARY

[0005] In view of the technical problem that cable has high safety requirement during use in the prior art, the utility model provides a special-shaped medium voltage cable.

[0006] The special-shaped medium voltage cable comprises a cable body and a protective sheath arranged on the outer surface of the cable body. The cable body comprises an inner sheath layer, and a grounding wire core, a plurality of medium voltage insulation wire cores and an optical fiber wire core are arranged in the inner sheath layer. Each of the medium voltage insulation wire cores comprises a twisted conductor and an inner shielding layer and a first insulation layer arranged outside the twisted conductor in sequence. The twisted conductor comprises a first conductor layer made of a plurality of circular tight-pressed conductors twisted with each other and a second conductor layer tightly pressed outside the first conductor layer. The second conductor layer comprises a plurality of trapezoidal conductors twisted with each other. The protective sheath comprises an outer shielding layer, a water-blocking layer, a flame-retardant layer, a heat dissipation layer and an outer sheath layer arranged in sequence away from the cable body. The water-blocking layer comprises a water-blocking tape and a plurality of water-blocking ropes uniformly distributed on the outer surface of the water-blocking tape. The water-blocking tape is wrapped outside the outer shielding layer. The flame-retardant layer comprises two layers of halogen-free low-smoke flame-retardant non-woven fabric belts. A plurality of heat dissipation pipes are arranged in the heat dissipation layer, and the heat dissipation pipes are filled with cooling liquid, and the cooling liquid is added with fluorescent agent and dyeing agent.

[0007] Further, a graphite coating layer is arranged between the first conductor layer and the second conductor layer.

[0008] Further, the heat dissipation layer comprises a heat dissipation inner layer and a heat dissipation outer layer arranged in sequence along the direction away from the cable body, a plurality of support rods are arranged between the heat dissipation inner layer and the heat dissipation outer layer along the length direction of the cable body, the heat dissipation pipes are arranged between the adjacent support rods, and a plurality of partitions are formed in the heat dissipation pipes, and the cooling liquid is contained in the heat dissipation pipes between the adjacent partitions; the heat dissipation inner layer, the heat dissipation outer layer, the heat dissipation pipes, the support rods and the partitions are all made of elastic material.

[0009] Further, the grounding wire core comprises a grounding conductor composed of a plurality of copper filaments which are bundled or twisted, and a grounding conductor isolation layer, a second insulation layer and a first aluminum foil shielding layer are arranged in sequence outside the grounding conductor.

[0010] Further, the optical fiber core comprises a plurality of optical fiber conductors and a third insulation layer and a second aluminum foil shielding layer arranged in sequence outside the optical fiber conductors.

[0011] Further, the water-blocking rope comprises a glass fiber rope core and a plurality of water-blocking yarns woven outside the glass fiber rope core.

[0012] Further, the outer surface of the outer sheath layer is concave inward along the length direction of the cable body to form a plurality of grooves.

[0013] Further, the dyeing agent is a red dyeing agent, and the fluorescent agent is a red fluorescent agent.

[0014] Further, the inner sheath layer is provided with a plurality of reinforcing steel wires.

[0015] Further, the inner sheath layer is a cross-linked polyethylene layer, and the outer sheath layer is a chloroprene rubber layer.

[0016] The utility model discloses a special-shaped medium-voltage cable, which comprises a cable body and a protective sleeve arranged on the outer surface of the cable body. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structure schematic view of a special-shaped medium-voltage cable is provided.

[0018] Figure 2 For Figure 1 A structure schematic view of A part is enlarged;

[0019] Figure 3 A structure schematic view of a grounding wire core is provided.

[0020] Figure 4 A structure schematic view of a medium-voltage insulation wire core is provided.

[0021] Figure 5 A structure schematic view of an optical fiber wire core is provided.

[0022] The drawing label

[0023] 1, inner sheath layer; 2, grounding wire core; 21, grounding conductor; 22, grounding conductor isolation layer; 23, second insulation layer; 24, first aluminum foil shielding layer; 3, medium-voltage insulation wire core; 31, first insulation layer; 32, inner shielding layer; 33, first conductor layer; 34, second conductor layer; 4, optical fiber wire core; 41, optical fiber conductor; 42, third insulation layer; 43, second aluminum foil shielding layer; 5, outer shielding layer; 6, water blocking layer; 61, water blocking tape; 62, water blocking rope; 7, flame-retardant layer; 8, heat dissipation layer; 9, outer sheath layer; 10, groove; 11, reinforcing steel wire. DETAILED DESCRIPTION

[0024] In order to further detail the utility model, the following will be described in conjunction with the drawings. It is particularly pointed out that the embodiments described below are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0025] Reference Figure 1 As shown in the figure, a special-shaped medium-voltage cable, comprising a cable body and a protective sleeve arranged on the outer surface of the cable body.

[0026] Specifically, the cable body comprises an inner sheath layer 1, the inner sheath layer 1 is provided with a grounding wire core 2, a plurality of medium-voltage insulation wire cores 3 and an optical fiber wire core 4. In this embodiment, the medium-voltage insulation wire core 3 is provided with three, and the three medium-voltage insulation wire cores 3 are arranged between the grounding wire core 2 and the optical fiber wire core 4 in turn.

[0027] Among them, reference Figure 2As shown, the grounding core 2 comprises a grounding conductor 21 made of copper wire bundles or complex strands, and the grounding conductor 21 is sequentially provided with a grounding conductor isolation layer 22, a second insulation layer 23 and a first aluminum foil shielding layer 24.

[0028] The grounding conductor 21 made of copper wire bundles or complex strands has good electrical conductivity, and cooperates with the grounding conductor isolation layer 22, the second insulation layer 23 and the first aluminum foil shielding layer 24 to effectively improve the electrical isolation, insulation protection and electromagnetic shielding capability, and enhance the safety and stability of the cable.

[0029] Reference Figure 3 As shown, the medium-voltage insulation core 3 comprises a twisted conductor and an inner shielding layer 32 and a first insulation layer 31 sequentially provided outside the twisted conductor.

[0030] The twisted conductor comprises a first conductor layer 33 made of a plurality of circular tight-pressed conductors twisted with each other and a second conductor layer 34 tightly pressed outside the first conductor layer 33, and the second conductor layer 34 comprises a plurality of trapezoidal conductors twisted with each other. In the embodiment, a graphite coating is provided between the first conductor layer 33 and the second conductor layer 34. The second conductor layer 34 is composed of three layers of trapezoidal conductors.

[0031] The trapezoidal conductors of the second conductor layer 34 can reduce the cross section of the twisted conductor, have good tight-pressing effect, and make the structure of the twisted conductor more compact. The circular tight-pressed conductors of the first conductor layer 33 can make the cable have good bending performance, which helps to reduce the bending stress of the cable in use. The graphite coating can reduce the gap of the bonding surface of the first conductor layer 33 and the second conductor layer 34, and help to balance the electric field distribution and prevent the occurrence of partial discharge, thereby improving the electrical performance and service life of the cable.

[0032] Reference Figure 4 As shown, the optical fiber core 4 comprises a plurality of optical fiber conductors 41 and a third insulation layer 42 and a second aluminum foil shielding layer 43 sequentially provided outside the optical fiber conductors 41.

[0033] Reference Figure 1 and Figure 2 As shown, the protective sleeve comprises an outer shielding layer 5, a water-blocking layer 6, a flame-retardant layer 7, a heat dissipation layer 8 and an outer sheath layer 9 sequentially provided in the direction away from the cable body.

[0034] The inner shielding layer 32 and the outer shielding layer 5 are both aluminum foil shielding layers. The inner shielding layer 32 and the outer shielding layer 5 are mainly used for shielding electromagnetic interference. The inner shielding layer 32 can effectively avoid signal interference between the grounding wire core 2, the medium-voltage insulated wire core 3 and the optical fiber wire core 4. The outer shielding layer 5 can shield the signal interference of the grounding wire core 2, the medium-voltage insulated wire core 3 and the optical fiber wire core 4 from the outside, thereby avoiding the distortion of the signals transmitted by the grounding wire core 2, the medium-voltage insulated wire core 3 and the optical fiber wire core 4 due to external interference, effectively improving the signal transmission quality, and ensuring that the cable will not interfere with each other when operating with other electrical equipment, thereby ensuring the safe and stable operation of the entire power system.

[0035] The water-blocking layer 6 comprises a water-blocking tape 61 and a plurality of water-blocking ropes 62 evenly distributed on the outer surface of the water-blocking tape 61; the water-blocking tape 61 is wrapped on the outside of the outer shielding layer 5.

[0036] The water-blocking tape 61 is a multi-layer water-absorbing resin water-blocking tape. The multi-layer water-absorbing resin water-blocking tape can absorb and lock a large amount of water, form an effective waterproof barrier, prevent further penetration of water from the outside of the cable, and improve the water-blocking performance of the cable.

[0037] The water-blocking rope 62 comprises a glass fiber rope and a plurality of water-blocking yarns woven on the outside of the glass fiber rope core. The water-blocking rope 62 uses the glass fiber rope as the rope core and weaves the water-blocking yarns on the outside of the glass fiber rope, thereby improving the structural strength, stability and durability of the water-blocking rope 62. The water-blocking yarns can quickly expand into a gel-like substance when encountering water, which can effectively prevent water from continuing to penetrate and spread, thereby protecting the inside of the cable from water damage, avoiding cable electrical faults and short circuit problems caused by water, and ensuring the stable operation of the cable in a humid environment.

[0038] The flame-retardant layer 7 comprises two layers of halogen-free low-smoke flame-retardant non-woven fabric belts. The halogen-free low-smoke flame-retardant non-woven fabric belt not only has excellent flame-retardant performance, but also has good mechanical properties and durability. The two layers of halogen-free low-smoke flame-retardant non-woven fabric belts not only can further improve the flame-retardant grade of the cable, effectively prevent the spread and diffusion of fire when the cable is on fire, but also can further enhance the overall strength and durability of the cable, and improve the anti-external damage ability of the cable.

[0039] The heat dissipation layer 8 is provided with a plurality of heat dissipation pipes 81, the heat dissipation pipes 81 are filled with cooling liquid (not shown in the figure), and the cooling liquid is added with fluorescent agent and dyeing agent. In this embodiment, the dyeing agent is a red dyeing agent; the fluorescent agent is a red fluorescent agent.

[0040] The cooling liquid in the heat dissipation pipe 81 can absorb and take away the heat generated inside the cable, and dissipate to the surrounding environment through the surface of the heat dissipation layer 8, further improving the heat dissipation performance of the composite cable. When the cable surface is burned, stretched and torn, or the surface is severely worn, the cooling liquid with red dye and red fluorescent agent leaks out when the structure of the heat dissipation pipe 81 is broken, emitting a more conspicuous red light to prompt maintenance personnel to check the cable in time, avoiding the occurrence of safety accidents due to the failure to find the cable damage in time. When the cable works underwater, the red dye can dye the water red when the heat dissipation pipe 81 is broken, prompting maintenance personnel to check in time; thus, the safety of the cable in use is improved while the heat dissipation performance is ensured.

[0041] By adding fluorescent agent and dye to the cooling liquid, when the cable is burned or stretched and torn to cause damage to the protective sleeve, the cooling liquid with dye and fluorescent agent flows out, providing warning to relevant personnel in time, avoiding the occurrence of safety accidents such as power leakage and interruption, and further improving the safety of the cable in use.

[0042] The heat dissipation layer 8 comprises a heat dissipation inner layer (not shown in the figure) and a heat dissipation outer layer (not shown in the figure) arranged in sequence in the direction away from the cable body, and a plurality of support rods 82 are arranged between the heat dissipation inner layer and the heat dissipation outer layer in the length direction of the cable body. The heat dissipation pipe is arranged between the adjacent support rods, and a plurality of partitions (not shown in the figure) are formed in the heat dissipation pipe. The cooling liquid is contained in the heat dissipation pipe 81 between the adjacent partitions; the heat dissipation inner layer, the heat dissipation outer layer, the heat dissipation pipe, the support rod 82 and the partition are all made of elastic material.

[0043] The support rod 82 not only separates the space between the heat dissipation inner layer and the heat dissipation outer layer, but also provides structural support to prevent the heat dissipation layer 8 from deforming or being damaged under temperature change or external force. The partitions divide the heat dissipation pipe 7 into a plurality of independent spaces to contain the cooling liquid, ensuring that the cooling liquid does not flow out during use. The heat dissipation inner layer, the heat dissipation outer layer, the heat dissipation pipe, the support rod 82 and the partition are all made of elastic material, which can adapt to the slight deformation of the composite cable during use, while maintaining stable heat dissipation performance.

[0044] The outer surface of the outer sheath layer 9 is recessed inward along the length direction of the cable body to form a plurality of grooves 10, increasing the surface friction and heat dissipation area of the outer sheath layer 9.

[0045] The inner sheath layer 1 is provided with a plurality of reinforcing steel wires 11. The addition of the reinforcing steel wires 11 improves the strength and further tensile strength of the cable body, and the overall structure is more stable

[0046] Preferably, the first, second and third insulation layers are all layers of polypropylene insulation material.

[0047] The preferred embodiments of the utility model disclosed above are only used for helping to set forth the utility model, and do not limit the utility model to the specific embodiments described. Obviously, according to the content of the description, other modifications and changes can be made. The embodiments selected and specifically described in the description are for better explaining the principle and practical application of the utility model, so that the person skilled in the art can well understand and utilize the utility model, and are not a limitation on the utility model, and any scheme simply transformed from the utility model belongs to the protection scope of the utility model.

Claims

1. A profiled medium voltage cable, characterized in that, The cable body comprises an inner sheath layer, and a grounding wire core, a plurality of medium-voltage insulated wire cores and an optical fiber wire core are arranged in the inner sheath layer. The medium-voltage insulated wire core comprises a twisted conductor and an inner shielding layer and a first insulation layer arranged outside the twisted conductor in sequence. The twisted conductor comprises a first conductor layer made of a plurality of circular tight-pressed conductors twisted with each other and a second conductor layer tight-pressed outside the first conductor layer, and the second conductor layer comprises a plurality of trapezoidal conductors twisted with each other. The protective sheath comprises an outer shielding layer, a water-blocking layer, a flame-retardant layer, a heat-dissipation layer and an outer sheath layer arranged in sequence along the direction away from the cable body. The water-blocking layer comprises a water-blocking tape and a plurality of water-blocking ropes uniformly distributed on the outer surface of the water-blocking tape. The flame-retardant layer comprises two layers of halogen-free low-smoke flame-retardant non-woven fabric tapes. The heat-dissipation layer is provided with a plurality of heat-dissipation pipes filled with cooling liquid, and the cooling liquid is added with fluorescent agent and dyeing agent.

2. A profiled medium voltage cable according to claim 1, characterized in that The heat-dissipation layer comprises a heat-dissipation inner layer and an outer heat-dissipation layer arranged in sequence along the direction away from the cable body, a plurality of support rods are arranged between the heat-dissipation inner layer and the outer heat-dissipation layer along the length direction of the cable body, the heat-dissipation pipes are arranged between the adjacent support rods, and a plurality of partitions are formed in the heat-dissipation pipes, and the cooling liquid is contained in the heat-dissipation pipes between the adjacent partitions; the heat-dissipation inner layer, the outer heat-dissipation layer, the heat-dissipation pipes, the support rods and the partitions are all made of elastic material.

3. A profiled medium voltage cable according to claim 1, characterized in that The grounding wire core comprises a grounding conductor composed of a plurality of copper wire bundles or compound twists, and a grounding conductor isolation layer, a second insulation layer and a first aluminum foil shielding layer arranged outside the grounding conductor in sequence.

4. A profiled medium voltage cable according to claim 1, characterized in that The optical fiber wire core comprises a plurality of optical fiber conductors and a third insulation layer and a second aluminum foil shielding layer arranged outside the optical fiber conductors in sequence.

5. A profiled medium voltage cable according to claim 1, characterized in that The water-blocking rope comprises a glass fiber rope core and a plurality of water-blocking yarns woven outside the glass fiber rope core.

6. A profiled medium voltage cable according to claim 1, characterized in that The outer surface of the outer sheath layer is recessed inward along the length direction of the cable body to form a plurality of grooves.

7. A profiled medium voltage cable according to claim 1, characterized in that The dyeing agent is a red dyeing agent, and the fluorescent agent is a red fluorescent agent.

8. A profiled medium voltage cable according to claim 1, characterized in that The inner sheath layer is provided with a plurality of reinforcing steel wires.

9. A profiled medium voltage cable according to claim 1, characterized in that The inner sheath layer is a cross-linked polyethylene layer, and the outer sheath layer is a chloroprene rubber layer.

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