15434results about "Insulated conductors" patented technology

The invention relates to the technical field of cables, and discloses a multi-layer composite wrapped high-temperature-resistant anti-aging cable which sequentially comprises a conductor, an insulating cable core, a shielding layer, an outer insulating layer, a fireproof layer, a heat insulation layer, a buffer cushion layer, an armor layer, an anti-aging layer and an outer sheath layer from inside to outside. The fireproof layer is formed by alternately laminating synthetic mica tapes and ceramic boron silicone rubber tapes, a reliable fireproof barrier is formed, and the heat insulation layer is arranged to achieve efficient heat insulation and stable structure through cooperation of gradient pore nano aerogel, ceramic silicone rubber round rods and phase change capsules. The buffering cushion layer is combined with the composite layer, the aluminum oxide hollow ball array and the composite capsule, so that the mechanical buffering and auxiliary heat insulation functions are achieved; the armor layer is woven by stainless steel fibers, the mechanical protection capability is improved, and the anti-aging layer is of a double-layer structure composed of montmorillonite composite fluororubber and an anti-oxidation layer, so that thermal oxidation aging is delayed.

Highly flame-retardant, heat-insulating and environmentally friendly cable with a copper core, wherein an insulating sheath (2) is permanently provided on the outside of the copper core (1), and a protective layer (3) is permanently provided on the outside of the insulating sheath (2), wherein four cavities (4) are arranged in the protective layer (3) in a uniform circular arrangement, wherein each of the four cavities (4) is filled with a flame retardant consisting of magnesium hydroxide powder, wherein a reinforcing layer (5) is permanently provided on the outside of the protective layer (3), and a hardening layer (6) is permanently provided on the outside of the reinforcing layer (5), wherein a thermal insulation layer (7) is permanently provided on the outside of the hardening layer (6), and wherein four protective units are provided on the outside of the copper core (1) in a uniform circular arrangement.

The invention provides a high-speed parallel paired wire with a heat dissipation function, which comprises two wire cores, a shielding layer, a heat dissipation layer and a sheath layer, and is characterized in that the two wire cores are arranged in parallel along a first direction; the shielding layer wraps the peripheries of the two wire cores; the heat dissipation layer wraps the periphery of the shielding layer; the sheath layer wraps the periphery of the heat dissipation layer; wherein the heat dissipation layer comprises a cold end layer, an electric refrigeration main body layer and a hot end layer which are arranged in sequence, the cold end layer is thermally coupled with the shielding layer, the hot end layer is thermally coupled with the sheath layer, and the electric refrigeration main body layer is configured to form a temperature difference between the cold end layer and the hot end layer after being electrified so as to transfer heat of the shielding layer to the sheath layer.

The invention relates to the technical field of cross-linked polyethylene cables, in particular to a mining cross-linked polyethylene insulated armored self-repairing cable and a manufacturing method thereof.The mining cross-linked polyethylene insulated armored self-repairing cable comprises a center conductor unit, a cross-linked polyethylene insulating layer, a shielding layer and an armored layer sequentially wrap the outer side of the center conductor unit from inside to outside, and an outer sheath layer is extruded on the outer side of the armored layer; the shielding layer comprises a semi-conductive shielding layer wrapping the outer side of the cross-linked polyethylene insulating layer, and the outer side of the semi-conductive shielding layer is wrapped with a copper strip shielding layer. By arranging the composite conductor structure in the central conductor unit and cooperating with the graphene heat dissipation filaments and the paraffin heat absorption and heat dissipation layer, the heat dissipation performance of the cable is improved, the temperature of the cable during operation is effectively reduced, faults caused by overheating are reduced, and the service life of the cable is prolonged; the armor layer and the copper strip shielding layer realize multipoint equipotential grounding through a sectional conductive adhesive tape, electromagnetic interference can be effectively shielded, and fault current diffusion is limited.

The invention discloses a longitudinal waterproof cable and a production process, and relates to the technical field of cables, the longitudinal waterproof cable comprises a cable body, the cable body comprises a cable core, a belting layer is arranged outside the cable core, a gap between the belting layer and the cable core is filled with water-blocking powder, an inner lining layer is arranged outside the belting layer, and the inner lining layer is filled with water-blocking powder. The outer portion of the inner lining layer is provided with an aluminum-plastic composite belt, the outer portion of the aluminum-plastic composite belt is provided with an outer sheath, the end portion of the outer sheath is provided with a sealing assembly, the sealing assembly is used for sealing the end portion of the cable body, and the outer sheath is sleeved with a protection assembly. The protection assembly is used for protecting the outer sheath, and the sealing assembly is matched with the protection assembly to seal the joint between the two adjacent cable bodies. The cable sheath can be effectively protected, corrosion and aging are delayed, the waterproof effect of the end of the cable is effectively improved, and water is prevented from invading from the end of the cable.

The invention discloses a direct-current flame-retardant tensile cable for a charging pile, and relates to the technical field of cables, the direct-current flame-retardant tensile cable comprises a conductor, the outer side of the conductor is wrapped with an insulating layer, the outer side of the insulating layer is wrapped with a shielding layer, the outer side of the shielding layer is provided with a protective layer, the direct-current flame-retardant tensile cable further comprises a flame-retardant assembly and a tensile assembly, and the flame-retardant assembly comprises a plurality of fixing pieces; a fire extinguishing chamber is formed by every two adjacent partition pieces, the fixing piece, the protective layer and the shielding layer, and the tensile assembly comprises a plurality of tensile pieces. Through arrangement of the flame-retardant pieces, when a fire breaks out in the fire extinguishing chamber, a fire breakout point can be covered to form a sealed space, and therefore the good flame-retardant effect is achieved; and through cooperation of the tensile member, the flame-retardant member, the telescopic air bag and inert gas in the fire extinguishing chamber, the tensile capability of the tensile member can be enhanced, so that the problem of poor flame-retardant and tensile capability of the existing charging pile cable is effectively solved.

The invention discloses a preparation process of a self-repairing intelligent cable and an intelligent repairing system of the self-repairing intelligent cable. The preparation process of the self-repairing intelligent cable comprises the steps of conductor pretreatment, preparation of the inner-layer basic insulating layer, preparation of the middle intelligent regulation and control layer, preparation of the outer-layer repairing layer and preparation of the outermost-layer protective layer. The intelligent repairing system of the self-repairing intelligent cable comprises the steps of damage sensing, repairing strategy selection, repairing triggering and dynamic modeling, performance optimization and closed-loop feedback. The preparation technology of the self-repairing intelligent cable has the following beneficial effects that the preparation technology of the self-repairing intelligent cable can have efficient self-repairing capability and a long-acting protection effect in an extreme environment. The intelligent repairing system can automatically adjust a repairing strategy according to changes of environmental conditions, and it is ensured that the cable can keep good self-repairing capacity in various severe environments.

The invention provides a submarine cable with a large cross section and high heat dissipation performance. The submarine cable comprises an inner protection layer, a center assembly, a plurality of electric units, a plurality of power assemblies and a first heat dissipation assembly. An accommodating cavity is formed in the inner protective layer; the central component is positioned in the accommodating cavity; the plurality of electric units are located in the accommodating cavity, and the plurality of electric units are arranged around the central assembly; the multiple power assemblies are located in the containing cavity, the multiple power assemblies and the multiple electric units are correspondingly arranged, and the power assemblies are configured to enable the electric units to move towards or away from the inner protection layer; the first heat dissipation assembly is arranged around the periphery of the inner protection layer, and the first heat dissipation assembly is configured to dissipate heat of the electric units making contact with the inner protection layer through the inner protection layer.

The invention relates to a photo-thermal super-hydrophobic multifunctional anti-icing coating as well as a preparation method and application thereof. The photo-thermal super-hydrophobic multifunctional anti-icing coating comprises primer and finish paint, the primer comprises the following raw materials in parts by weight: 20-25 parts of bisphenol A type epoxy resin and / or fluorine modified epoxy resin, 10-20 parts of fluorine modified polyacrylic resin and / or polyurethane resin, 5-10 parts of a curing agent and 40-55 parts of a solvent; the finish paint comprises the following components in parts by weight: 2-5 parts of polytetrafluoroethylene, 1-3 parts of soluble polytetrafluoroethylene, 1-5 parts of polydimethylsiloxane and 85-90 parts of fluorinated MOF dispersion liquid. Compared with the prior art, the photo-thermal super-hydrophobic multifunctional anti-icing coating provided by the invention has the characteristics of super-hydrophobicity, rapid ice melting, wear resistance, reduction of ice adhesion strength and reduction of icing amount, can effectively solve the problem of icing of an aluminum conductor of a power transmission line of a power system, and can be applied to power equipment such as the aluminum conductor of the power transmission line.

The invention discloses an explosive environment airtight medium-voltage power transmission cable, and relates to the technical field of power cables, the explosive environment airtight medium-voltage power transmission cable comprises a central conductor, the outer side of the central conductor is tightly coated with an internal conductor insulator, and the outer side of the internal conductor insulator is tightly coated with an insulated conductor shield; the outer sides of the multiple insulated conductor shields are jointly coated with a steel tape armoring, the outer side of the steel tape armoring is tightly coated with a PVC protection sleeve, and the outer side of the PVC protection sleeve is provided with an external telescopic expansion protection mechanism. A fireproof barrier is constructed on the outer side of the cable through the flame-retardant metal thin net, it is ensured that combustible gas outside the cable cannot be ignited even if open fire appears in the cable, the overall fireproof and explosion-proof performance of the cable is further effectively improved, and meanwhile the outer diameter of a fault position is actively increased, so that the service life of the cable is prolonged. A high-voltage breakdown protection layer in the cable is prevented from igniting external combustible gas, and the overall protection performance of the cable is improved.

A production device for high-quality corrosion-resistant steel core aluminum stranded wire, comprising a frame stranding machine (1), an electrolyte tank 1 (2), a roller (3) and an electrolyte tank 2 (4) arranged in sequence from top to bottom. The frame stranding machine (1) is arranged vertically to strand an aluminum conductor (6) on a steel core (5). The electrolyte tank 1 (2) contains a cylindrical electrode 1 (7) and an electrolyte. The cylindrical electrode 1 (7) has openings at both ends and is placed vertically with the steel core (5) as an axis. The stranding part is located in the cylindrical electrode 1 (7). The production device for high-quality corrosion-resistant steel core aluminum stranded wire of the present invention places the frame stranding machine vertically and surrounds the stranding part with the cylindrical electrode 1, so that the distance between the steel core and the aluminum conductor and the cylindrical electrode 1 at the stranding part is roughly equal, and the steel core and the aluminum conductor at the stranding part are immersed in the electrolyte at the same depth, so that the ceramic film layer formed on the surface of the steel core and the aluminum conductor is more uniform, which can greatly improve the overall corrosion resistance of the steel core aluminum stranded wire.

The invention discloses an anti-fracture low-voltage power cable, and relates to the technical field of low-voltage cables, the anti-fracture low-voltage power cable comprises three core bodies, the surfaces of the three core bodies are all sleeved with shielding layers, the surfaces of the shielding layers are wrapped with insulating layers, the outer sides of the three core bodies are sleeved with an inner protection layer, the surface of the inner protection layer is sleeved with a thermal insulation layer, and the thermal insulation layer is wrapped with an outer protection layer. The outer side of the thermal insulation layer is sleeved with an outer protection layer, the surface of the outer protection layer is provided with a sliding protection mechanism, and the inner side of the outer protection layer is provided with a reinforcing anti-breaking mechanism in an embedded manner. And when the cable slides, the outer protection layer is not rubbed with the ground, so that the outer protection layer of the cable is prevented from being rubbed and scraped to influence subsequent normal use, the cable is protected to a certain degree, and impurities such as dust and soil adhered to the surface of the cable in the cable transportation and laying process can be scraped.

The invention discloses a preparation method of a B1-grade flame-retardant fire-resistant control cable, belongs to the technical field of flame-retardant fire-resistant cables, and aims to solve the technical problem that the mechanical strength and the fire-resistant and flame-retardant performance of an inorganic flame-retardant modified fire-resistant fire-resistant control cable in the prior art need to be further improved. The method comprises the following steps that a plurality of cable cores are arranged in parallel, gaps among the cable cores are filled with filling ropes to form filling layers, the cable cores filled with the filling layers are wrapped together through a wrapping tape, and a wrapping layer is formed outside the cable cores. According to the invention, maleic anhydride modified polyethylene is used as a phase solvent, and polyethylene is cross-linked and enhanced by modified graphite and modified polysiloxane, so that not only is the mechanical strength of the cable material effectively improved, but also the fire resistance and flame retardance of the cable material are improved.

The invention discloses an environment-friendly safe high-voltage smooth aluminum sheath power cable, which relates to the technical field of power cables and comprises a conductor mechanism, and a water blocking mechanism is arranged on the outer surface wall of the conductor mechanism. In the use process, under the action of the waterproof film, a blocking effect can be achieved on permeating rainwater, then under the action of the water blocking tape, the permeating rainwater can be absorbed, gelatinous substances are formed to block a water seepage channel, then the rainwater is further absorbed and blocked through the water absorption expansion materials placed in the containing grooves, and therefore the rainwater seepage effect is improved. Meanwhile, rainwater can be fully absorbed through a water blocking material in the storage box, the rainwater is prevented from continuously permeating into the cable, and the rainwater can be blocked under the action of a waterproof sleeve, so that the cable is protected, the situation that the cable is short-circuited and spontaneously ignited due to the influence of the rainwater during power transmission is avoided, and the service life of the cable is prolonged. And the maintenance cost of the cable is greatly reduced.

The invention relates to a fire-resistant cable and a preparation method and application thereof. The fire-resistant cable comprises a conductor core layer, a silicone rubber insulating layer, a fire-resistant mica filling layer, a shielding layer and a fire-resistant flame-retardant sheath layer. When the magnesium hydroxide flame retardant is prepared, piperazine phytate is added and is adsorbed on the surface of magnesium hydroxide to form electrostatic repulsion or steric hindrance, so that a protective layer is constructed on the surface of a particle, and particle aggregation is prevented. In addition, after the piperazine phytate modified magnesium hydroxide is compounded with the expanded graphite and the zinc stannate, a remarkable synergistic flame-retardant effect is shown, and efficient flame-retardant and fire-resistant performance of the cable material is achieved. The fireproof filler is added in the polypropylene cable sheath layer, so that the flame retardance and fire resistance of the cable are further improved, and it is ensured that the cable does not drip in the combustion process; therefore, the cable can still keep safe and reliable performance under extreme conditions such as fire disasters and the like, and powerful guarantee is provided for personnel safety and fire rescue.

The present invention relates to the technical field of electrical connectors, and in particular to an anti-loosening electrical connector for electromechanical equipment, comprising a coaxially plugged core barrel and a piercing barrel, wherein a plurality of cables are clamped on the core barrel, and the ends of the plurality of cables extend along the radial direction of the core barrel and are evenly distributed around the circumference of the core barrel, and the piercing barrel is provided with a plurality of piercing pieces, one end of the piercing piece is provided with a clamping groove, and the interior of the clamping groove is provided with a cutting section, a pressing section and a conductive section in sequence from bottom to top, the cutting section is used for cutting the insulating sheath of the cable, the pressing section is used for clamping the insulating sheath of the cable, and the conductive section is used for conductive connection with the wire core of the cable, and a clamping ring is rotatably provided on the piercing piece, and the clamping ring is U-shaped; in the initial state, the center line of the clamping ring coincides with the center line of the clamping groove, and the clamping ring can be clamped with the insulating sheath of the cable; the clamping ring can be rotated 90°, so that the insulating sheath is in closer contact with the wire core.

The invention discloses an impact-resistant and distortion-resistant outdoor polyethylene power cable, and relates to the technical field of cables, the impact-resistant and distortion-resistant outdoor polyethylene power cable comprises a cable core, four annularly distributed wire cores are arranged in the cable core, each wire core is composed of an inner-layer conductor, an outer-layer conductor, a heat conduction enhancement layer, an inner enhancement layer and an inner insulation layer, a shielding combination layer is arranged outside a wrapping layer, and a shielding layer is arranged outside the wrapping layer. The shielding combination layer is composed of a high-conductivity metal thin film layer, a nanometer shielding layer and a protective coating, the anti-impact combination layer is arranged outside the shielding combination layer, the anti-impact combination layer is composed of an impact dispersion layer and an energy absorption layer, the anti-distortion combination layer is arranged outside the anti-impact combination layer, and the anti-distortion combination layer is composed of an impact dispersion layer and an energy absorption layer. The anti-distortion combination layer is composed of a core layer and an elastic buffer layer, an outer sheath is arranged outside the anti-distortion combination layer, and the outer sheath is composed of a reinforcing layer, a blocking layer and an outer protective layer, so that the problems that the power cable is poor in impact resistance and distortion resistance and inconvenient to maintain are solved.

The invention relates to the technical field of power transmission, and discloses a composite single-core power cable, comprising: a composite core composed of carbon fibers, glass fibers and a resin matrix containing a self-repairing microcapsule, the self-repairing microcapsule being capable of releasing a repairing monomer and repairing a microcrack when the composite core generates the microcrack; the conductor layer is arranged around the composite core and is composed of an aluminum conductor containing nano graphene; the insulating layer wraps the conductor layer and is made of a temperature-sensitive polymer material; and the outer sheath wraps the insulating layer and is made of a waterproof corrosion-resistant material. The composite core of the cable can recover more than 90% of original strength (the loss of tensile strength after repair is only 3%, which is recovered from 580Ksi to 570Ksi) within 24 hours after microcracks (such as the depth of 10mu m) generated by mechanical stress or fatigue in the operation process, and the self-repairing mechanism does not need manual intervention or external equipment, so that the self-repairing performance is greatly improved. And the sudden failure of the traditional cable caused by micro-damage accumulation is avoided.

A hybrid cable includes at least two bonded pairs of electrical conductors, such as four bonded pairs. The bonded pairs may be stranded about a central member and may also be bonded to each other. In one embodiment, the central member is a GRP rod, and one or two buffer tubes, each containing optical fibers, are stranded along with the bonded pairs about the GRP rod. In another embodiment, the central member is a tube and plural optical fibers are contained within the tube. Each bonded pair of electrical conductors carry digital or class 4 power from a transmitter card to a respective receiver card. Each bonded pair has unique indicia to facilitate the correct connections between the transmitter and receiver cards, such as tactile physical features on an outer surface of one of the electrical conductors of each bonded pair.

The invention discloses an anti-interference flame-retardant cable, which relates to the technical field of power cables, and is characterized by comprising an outer protection layer consisting of a rubber outer sheath, a metal armor and a protection mechanism, an inner protection layer consisting of a wrapping tape, a fireproof layer and a waterproof insulating layer, and a plurality of groups of guide cores wrapped in the waterproof insulating layer, the rubber outer sheath, the metal armoring and protection mechanism, the wrapping tape, the fireproof layer and the waterproof insulating layer are arranged in sequence from outside to inside, the overall layer of the cable is effectively divided through the protection mechanism formed by a plurality of annular assemblies, and the metal annular seats of the annular assemblies are arranged in the fireproof layer. The annular assemblies can resist the pressure directly generated by the outside of the cable, when torsion is generated outside the cable, the annular seats buffer the external torsion through the springs among the annular seats, the influence on the inner protection layer is reduced to a large extent, in addition, when the cable is connected, the position of the inner protection layer can be finely adjusted through the rotating structures of the annular assemblies, and therefore the stability of the cable is improved. And the connection of the cable is accurate.

The invention relates to the technical field of cables, and provides an ultraviolet-resistant photovoltaic cable which sequentially comprises a conductor, an insulating layer, a lining layer, a shielding layer and an outer sheath from inside to outside, and the outer sheath is prepared from the following raw materials in parts by weight: 35-45 parts of chloroprene rubber, 20-25 parts of ethylene propylene rubber, 25-35 parts of a flame retardant, 1-3 parts of a vulcanizing agent, 3-5 parts of an antioxidant, 0.8-1.2 parts of an ultraviolet absorbent, 3-5 parts of a lubricant and 15-25 parts of reinforcing filler; the reinforcing filler comprises lignin fibers and nano titanium dioxide, and the mass ratio of the lignin fibers to the nano titanium dioxide is (1: 5)-(5: 1). According to the technical scheme, the problems of poor mechanical property and ultraviolet resistance of the photovoltaic cable in the prior art are solved.

The invention relates to the technical field of cable preparation, in particular to an extruded insulation low-voltage power cable and a preparation method thereof.The preparation method comprises the steps that metal wires are twisted into a conductor according to preset twisting parameters, and the conductor is preprocessed; extruding an insulating layer on the surface of the pretreated conductor by using a screw extruder to obtain an insulated wire core; monitoring the diameter of the insulated wire core in real time by using a laser diameter measuring instrument, and determining the fluctuation characteristic type of the diameter of the wire core under a first preset condition; obtaining the eccentricity of the insulating layer and the void ratio between the insulating layer and the conductor; judging the qualification of the extrusion process according to the extrusion comprehensive quality index; under the condition that the extrusion process is unqualified, the qualification of the extrusion process is secondarily judged according to the insulation performance evaluation value; under the condition that the extrusion process is judged to be unqualified for the second time, an adjustment strategy of the extrusion process is determined; and after the insulated wire cores qualified in the extrusion process are twisted into a cable, an outer protective sleeve is extruded. The production efficiency and the product stability of the cable are improved.

To surely prevent short circuit accompanied by contact of a metal bar with a metal structure in its periphery.SOLUTION: An on-vehicle bus bar 1 has a metal bar 10, a fireproof tape and an insulator layer 30. The one or two or more fireproof tapes are overlapped and wound around the metal bar 10, at least the one fireproof tape is longitudinally attached thereto and wound therearound, and the metal bar 10 and the fireproof tape are coated with the insulator layer 30.SELECTED DRAWING: Figure 1

The invention relates to the technical field of cables, and provides a fireproof flame-retardant 10kV power cable and a preparation method thereof. The fire-resistant flame-retardant 10kV power cable comprises a conductor and a fire-resistant flame-retardant layer, the fireproof flame-retardant layer is prepared from the following raw materials in parts by weight: 35 to 45 parts of linear low-density polyethylene, 40 to 50 parts of ethylene-vinyl acetate copolymer, 25 to 30 parts of modified aluminum hydroxide, 5 to 8 parts of polyethylene grafted maleic anhydride, 10 to 12 parts of phosphate modified halloysite nanotube, 5 to 8 parts of ZIF-8 loaded zinc borate core-shell particles, 15 to 20 parts of magnesium hydroxide and 2 to 3 parts of silane coupling agent. 0.5 to 1 part of antioxidant, 0.5 to 1 part of calcium stearate and 1 to 1.5 parts of polyethylene wax. According to the cable prepared in the invention, the situation that a conductor is exposed and the fire resistance is lost due to cracking and falling under long-time high-temperature baking is avoided; the continuous effectiveness of the flame retardant at high temperature is improved.

A method for installing a wiring harness into a vehicle including coupling at least one module and the wiring harness to a fixture to form a structure, moving the structure to the vehicle, decoupling the module and the wiring harness from the fixture, coupling the module and the wiring harness to the vehicle, and removing the fixture from the vehicle.

The invention provides a tear-resistant, wear-resistant, low-smoke and non-dripping sheath material as well as a preparation method and application thereof. The tear-resistant wear-resistant low-smoke non-dripping sheath material is prepared from the following components in parts by weight: 25 to 35 parts of metallocene linear low-density polyethylene, 10 to 15 parts of ethylene-vinyl acetate copolymer, 6 to 8 parts of compatilizer, 50 to 60 parts of aluminum hydroxide, 10 to 15 parts of magnesium hydroxide, 3 to 4 parts of microencapsulated red phosphorus, 5 to 8 parts of lithium oxide synergist, 4 to 6 parts of silicone master batch, 0.3 to 0.7 part of carbon black master batch and 1.5 to 2.5 parts of coupling agent. The tear-resistant wear-resistant low-smoke non-dripping sheath material provided by the invention has the characteristics of being halogen-free, flame-retardant, tear-resistant and wear-resistant, and a low-smoke halogen-free flame-retardant power cable prepared from the sheath material has the characteristics of high smoke light transmittance during combustion, no dripping and cracking resistance.

The utility model discloses a pressure-resistant cross-linked polyethylene power cable which comprises an outer sheath, an armor layer, an oxygen isolation inner protection layer and a flame-retardant wrapping tape layer which are sequentially arranged from outside to inside, and a pressure-resistant cable core, a plurality of power cable cores and a plurality of interval units are arranged in the flame-retardant wrapping tape layer. According to the power cable, the oxygen isolation inner protection layer effectively prevents oxygen permeation and delays aging of the cable, and the flame-retardant belting layer improves the fireproof performance of the cable. The multiple surrounding plate bodies surround the pressure-resistant cable core, and the spacing plate bodies play a role in separating and fixing the power cable core, so that the pressure-resistant capability of the cable is improved, and the overall structure of the cable is more compact and stable. In addition, the insulating layer is made of the cross-linked polyethylene material, so that the cable has good insulating performance, short circuit can be effectively prevented, the safety and reliability of the cable are improved, and power transmission is stable and efficient.

The invention discloses an optical cable capable of being remotely inspected and a preparation method and application thereof, and belongs to the technical field of optical cable preparation, the optical cable comprises an optical unit, an electric unit and an outer sheath, the optical unit is arranged in a containing space of the outer sheath, the electric unit is connected with the outer sheath, the arrangement direction of the electric unit is parallel to the axis of the outer sheath, and the optical cable is arranged in the containing space. And the positive excess length of the electrical unit relative to the outer sheath is 0.05%-0.8%. According to the optical cable capable of being remotely inspected, when the optical cable is coated with ice, the electric unit and the outer sheath are synchronously stretched, the electric unit cannot be stretched and thinned due to the existence of the positive excess length, after the stretched length of the outer sheath makes up the excess length of the electric unit, the electric unit is stretched along with the outer sheath, and the increase of wave impedance of the electric unit can be detected through a TDR detection technology; an optical cable maintainer can maintain the optical cable in advance when the wave impedance of the electric unit is increased, the ice on the surface of the optical cable is removed, and the problem of cable breakage caused by continuous accumulation of ice and snow is avoided.

The invention discloses a heat dissipation mechanism and an installation method thereof, a device applying the heat dissipation mechanism and a cable system. The heat dissipation mechanism is used for dissipating heat of a heat dissipation demand unit. The heat dissipation mechanism comprises an inner heat dissipation sleeve used for being connected outside the inner heat dissipation demand part in a sleeving mode, and the inner side wall of the inner heat dissipation sleeve is used for being attached to the outer side wall of the inner heat dissipation demand part; the outer heat dissipation sleeve comprises a plurality of outer heat dissipation plates, the outer heat dissipation plates are arranged at intervals in the circumferential direction of the inner heat dissipation sleeve, a heat dissipation gap is formed between each outer heat dissipation plate and the inner heat dissipation sleeve, and the outer side wall of the outer heat dissipation sleeve is used for being attached to the inner side wall of the outer sleeve body; the heat conduction pieces are connected between at least part of the outer heat dissipation plates and the inner heat dissipation sleeves; and the elastic pieces are arranged between each outer heat dissipation plate and the inner heat dissipation sleeve in an abutting mode, and each outer heat dissipation plate is configured to be capable of moving in the radial direction of the inner heat dissipation sleeve.

The invention discloses a convenient-to-connect medium-voltage cable, and relates to the technical field of power cables, the convenient-to-connect medium-voltage cable comprises a cable body, a plurality of cable cores are installed in the cable body in the circumferential direction at equal angles, a built-in sleeve is installed on the inner side of the cable body, an air bag is installed in the built-in sleeve, and a plurality of ring strips are evenly installed on the outer wall of the built-in sleeve at equal intervals; according to the invention, double dispersion and buffering of external impact pressure can be realized, so that the cable can adapt to a more severe and complicated external environment, the external impact force can be converted into defense force for inhibiting further deformation of the cable body, and the cable can be prevented from being damaged. The external impact force is prevented from being directly applied to the cable core, the cable appearance is endowed with the automatic repairing capability, the cable body can be prevented from being directly and rigidly pulled, the external pulling force and the bending stress can be dispersed in the radial direction of the cable, and more comprehensive and reliable protection on the cable core is achieved.