768results about "Power cables" patented technology

The invention discloses an environment-friendly flame-retardant medium-voltage cable, and relates to the technical field of cables, the outer side of an inner conductor is provided with a flame-retardant protection assembly, the flame-retardant protection assembly comprises flame-retardant filling bodies, the middle parts of the opposite side surfaces of the adjacent flame-retardant filling bodies are provided with supporting grooves, and arc-shaped spring plates are adhered to the interiors of the supporting grooves. The outer side of the cable is extruded and collided, the impact force is attenuated layer by layer, the situation that the cable is damaged due to collision and impact is reduced, when the outer side of the cable is frozen, the heating wire emits heat, and the cable is prevented from being damaged. When the cable is deiced, the inflatable strip outside the insulating middle layer is uniformly heated, the outer insulating layer is pushed to bulge, and the ice layer outside is jacked open, so that the ice layer is broken and falls off, and compared with the conventional deicing method which only depends on heating, the energy consumption is lower, the cable is environment-friendly and energy-saving, the deicing effect is better, and the cable is more favorably protected.

The invention relates to the technical field of cables, and particularly discloses a high-performance halogen-free flame-retardant flexible power cable. The high-performance halogen-free flame-retardant flexible power cable comprises a core layer, an insulating layer, a flame-retardant layer, a shielding layer and a protective layer which are arranged in sequence, the flame-retardant layer is prepared from the following raw material components in parts by weight: 30 to 40 parts of ethylene-vinyl acetate copolymer, 10 to 20 parts of polyolefin elastomer, 8 to 10 parts of microencapsulated ammonium polyphosphate, 2.5 to 4.5 parts of pentaerythritol, 20 to 30 parts of inorganic flame retardant, 5 to 8 parts of expansible graphite, 2 to 3 parts of diatomite, 0.5 to 1.5 parts of nano kaolin, 2 to 3 parts of zinc borate, 0.1 to 0.5 part of antioxidant and 0.5 to 1.0 part of lubricant. The cable provided by the invention not only has good flame retardant property, but also has certain flexibility.

The utility model discloses an intelligent early warning cable, which comprises a power line insulation wire core arranged in a first belting layer, the power line insulation wire core comprises a conductor and an insulation layer coated outside the conductor, and a temperature measuring element is arranged in the conductor; an armor layer is arranged outside the first belting layer, and a vibration measuring element is arranged in the armor layer; and an isolating layer is arranged between the first belting layer and the armor layer. The temperature measuring element with the temperature measuring function is arranged on the outermost layer of the conductor, so that the temperature of the cable conductor can be monitored more accurately; the vibration measurement element with the vibration measurement function is arranged in the armor layer, and the isolation layer is arranged between the first belting layer and the armor layer, so that an electromagnetic field generated by the cable in the first belting layer under the conditions of high voltage and large current can be isolated, and the problem that the electromagnetic field interferes optical signal transmission in the vibration optical fiber is avoided; the vibration signal can be accurately detected, and the detection accuracy is prevented from being influenced by deviation.

The invention discloses a large-current-carrying-capacity flexible power cable, which belongs to the technical field of cable preparation, is used for solving the technical problem that the flame retardant property and the mechanical property of the power cable need to be further improved in the prior art, and specifically comprises a cable core, a wrapping layer, an insulating layer and a sheath layer which are sequentially arranged from inside to outside. The preparation method comprises the following steps: preparing alkoxy silane containing a benzocyclobutene group, preparing flame-retardant particles by using a sol-gel method, preparing modified polyurethane by using modified polysiloxane and 2, 5-furandimethanol as soft segments, naphthalene diisocyanate as a hard segment and trimethylolpropane as a chain extender, and preparing the flame-retardant flame-retardant polyurethane. The linear low-density polyethylene, the MAH-g-PE, the modified polyurethane, the flame-retardant particles and the auxiliary additive are melted and extruded outside the wire core to form the insulating layer, so that the power cable is obtained, the flame-retardant property of the power cable is effectively improved, and the mechanical property and the current-carrying stability of the power cable are also improved.

The invention discloses a new energy cable for power transmission, and relates to the technical field of cables, the new energy cable for power transmission comprises an anti-corrosion sleeve, a neck bush is installed in the anti-corrosion sleeve, a conductor is arranged in the neck bush, a sealing and butt joint mechanism is arranged on the outer side of the anti-corrosion sleeve, and the sealing and butt joint mechanism comprises a reinforcing ring sleeve. The device is scientific and reasonable in structure and safe and convenient to use, a sealing and butt joint mechanism is arranged, a positioning buckle is driven to move to the outer side of the reinforcing ring sleeve through traction of a traction baffle ring, and through cooperation of a positioning shaft seat, an anti-deviation supporting rod and an opening and closing sliding block, the anti-deviation supporting rod is fixed to the outer side of the anti-deviation supporting rod, and the anti-deviation supporting rod is fixed to the outer side of the anti-deviation supporting rod. The two positioning buckles are attached together in a sliding mode to form an annular buckle, the annular buckle is connected into the reinforcing ring sleeve in a sleeved mode, the splicing inserting rod is embedded into the positioning groove, and then the sealing buckle is pulled to move through cooperation of the limiting rotating cylinder, the telescopic sleeve rod and the positioning shaft base.

The invention relates to the technical field of power cables, and provides a corrosion-resistant insulated power cable which sequentially comprises a conductor, an insulating layer and a sheath layer from inside to outside, and the sheath layer comprises the following raw materials in parts by weight: 70-80 parts of polyethylene, 20-25 parts of polyvinyl chloride, 10-15 parts of filler, 6-8 parts of a compatilizer, 1-3 parts of a plasticizer, 0.5-1.5 parts of an antioxidant, 1-2 parts of a lubricant and 1-2 parts of a cross-linking agent. The filler comprises the following raw materials in parts by weight: 60-70 parts of talcum powder, 30-40 parts of kaolin and 8-10 parts of a nitrogen-containing fluorinated aromatic compound. According to the technical scheme, the problem of poor corrosion resistance of the insulated power cable in the prior art is solved.

The invention relates to the technical field of cables, and discloses an anti-ultraviolet outdoor cold-resistant power cable adapting to day and night temperature difference. The device is provided with the polyurea sealing micro-capsules, the hexagonal cells, the micro-capsule elastic pieces and the stretching structures, in a low-temperature environment, the polyurea sealing micro-capsules contract, at the moment, the micro-capsule elastic pieces lose supporting force and begin to release elastic potential energy, the hexagonal cells deform and begin to expand outwards, and when the hexagonal cells expand outwards, the trough positions of the stretching structures are pushed to expand outwards; the stretching structure is gradually stretched into a cylindrical outline from a corrugated shape, under the external expansion action of the hexagonal cells and the stretching structure, the cable sheath layer is promoted to actively expand to offset shrinkage stress, the problem of low-temperature embrittlement is effectively avoided, meanwhile, the design of the corrugated structure is used for coping with axial shrinkage of the cable sheath layer, and the tensile strength of the cable sheath layer is improved. The cable is divided into a plurality of independent units by the cable separation rings, the overall axial shrinkage is decomposed into local small-amplitude shrinkage of each unit, and cable distortion and cable insulation layer cracking caused by shrinkage stress accumulation are avoided.

The invention relates to the technical field of cables, in particular to a composite low-voltage power cable. In the long-term compression and impact process of the existing cable, the cable core structure is easy to deform and damage, the resistance of a conductor is abnormally increased, and the risk of power supply interruption is obviously increased. Comprising a protective sleeve, an armor layer is installed in the protective sleeve, and a plurality of supporting blocks and a plurality of cable cores are arranged in the armor layer; the protective sleeve is provided with a plurality of first cavities distributed at equal intervals in the circumferential direction, and the first cavities are used for providing a movement range for deformation of the protective sleeve and facilitating dislocation rotation of the inner side faces and the outer side faces of the first cavities in the deformation process. According to the invention, through the movement space provided by the first cavity, the extrusion of a heavy object is buffered, and the extrusion of the heavy object is guided to be staggered, so that the impact force borne by a cable core is reduced; and through a multi-layer composite structure formed by the protective sleeve and the armor layer, the use strength of the cable is improved.

The invention relates to the technical field of power cables, and provides a cross-linked polyethylene insulated power cable with an anti-seismic function, which comprises a cable body, the cable body is composed of a plurality of stranded wires, an insulating layer is arranged outside each wire, a filling layer and a belting layer are sequentially arranged outside the plurality of wires, and the insulating layer is arranged outside the plurality of wires. The cable comprises a cable body and further comprises a sheath layer, fixing seats, upper fixing frames, supporting assemblies and buffering assemblies, the sheath layer comprises an inner sheath and an outer sheath, the cable body is provided with a plurality of fixing seats, each fixing seat is provided with one upper fixing frame, the supporting assemblies are arranged between each fixing seat and the corresponding upper fixing frame, each fixing seat is provided with one buffering assembly, and the buffering assemblies are arranged on the supporting assemblies. According to the technical scheme, the problem that in the prior art, when a cross-linked polyethylene insulated power cable is arranged near a factory workshop or in a tunnel or other positions where vibration is likely to be generated, vibration can affect the cable through the ground or a supporting structure, and the cable is damaged is solved.

The invention discloses a 220kV submarine cable capable of preventing seawater corrosion, and relates to the technical field of cables, the outer side of an insulation isolation layer is provided with an outer protection support assembly, the outer side of the insulation isolation layer is wrapped with an armor layer, the outer side of an expansion layer is uniformly provided with mark grooves, the outer side of an insulation anti-corrosion layer is embedded with a spiral support ring, and a positioning ring is fixedly sleeved in a fixing groove. According to the cable, when the cable moves, the annular buffer net bulges and rolls, is more elastic and has better impact absorption capacity, the damage of the insulating anti-corrosion layer is further avoided, the expansion layer is further prevented from absorbing water and expanding, and the cable is prevented from being damaged. The damaged position is extruded, the speed of seawater permeating into the cable is reduced, the foam plastic strip and the driving ball diffuse and flow out along the damaged position, and the damaged area can be marked after the submarine cable is damaged, so that maintenance personnel can quickly determine the damaged position for repairing.

The invention relates to the technical field of cables, and provides a low-voltage power cable which sequentially comprises a conductor, an insulating layer, a lining layer, an armor layer and a sheath layer from inside to outside. The armor layer is formed by winding two layers of parallel steel belts outside the cable lining layer in a spiral or longitudinal wrapping manner; the conductor is formed by twisting tinned copper wires; the sheath layer is a polyvinyl chloride resin sheath layer.

The invention relates to an insulating material, in particular to a nano composite insulating material, an insulated cable and an insulation defect repairing robot. The nano composite insulating material comprises core-shell particles, modified montmorillonite and crosslinked polyethylene, wherein each core-shell particle is provided with a core layer and a shell layer. The insulating layer of the insulated cable is made of the nano-composite insulating material. The insulation defect repairing robot can utilize the insulation defect repairing material to repair the crack defect of the insulation layer of the related cable. The material can automatically repair cracks under the action of an electric field and a thermal field, repeated repair for more than five times is achieved, micro defects smaller than or equal to 100 microns can be automatically repaired in the cable operation process, 90% of unplanned power failure faults are reduced, and the whole life cycle fault cost is reduced by 60%.

The utility model discloses a water-blocking buffer power cable protection structure which comprises a wire core conductor, a sleeve layer is arranged on the outer side of the wire core conductor, a wrapping layer is arranged on the opposite outer side of the wire core conductor, buffer sleeves are annularly arranged on the sleeve layer at intervals, the interior of each buffer sleeve is hollow to form a buffer cavity, a water-blocking pad is circumferentially arranged along the outer side of the wrapping layer, and the water-blocking pad is arranged on the outer side of the wrapping layer. And the outer sleeve layer is close to the outer sleeve layer and is locally embedded in the peripheral part of the wrapping layer. According to the utility model, the wrapping layer and the sleeve layer which are staggered and matched are sequentially arranged outside the wire core conductor, and the water-blocking pad is arranged on the sleeve layer close to the outer side and partially embedded at the periphery of the wrapping layer, so that the waterproofness of the power cable is effectively improved, and meanwhile, the water-blocking pad is matched with the buffer sleeves which are annularly arranged on the sleeve layer at intervals, so that the waterproof performance of the power cable is improved. Deformation force in different directions after the cable is twisted can be borne, the bending position of the power cable is protected, and the practicability of the cable is improved.

The invention relates to the technical field of cables, and provides a corrosion-resistant insulated power cable. The corrosion-resistant insulated power cable is sequentially provided with a conductor layer, an insulating layer and a sheath layer from inside to outside, and the insulating layer is prepared from the following raw materials in parts by weight: low-density polyethylene, magnesium hydroxide and calcium carbonate composite powder, an antioxidant, dicumyl peroxide, zinc stearate and polyethylene wax; the sheath layer comprises the following raw materials in parts by weight: PVC resin, magnesium hydroxide and calcium carbonate composite powder, diisononyl phthalate, a calcium-zinc composite stabilizer, an antioxidant, polyethylene wax and calcium stearate. According to the corrosion-resistant insulated power cable prepared in the invention, the corrosion resistance of the power cable in extreme corrosion environments such as strong acid, strong alkali, high-concentration salt mist and the like is improved, and the condition that a common cable sheath is easy to expand and crack in the extreme corrosion environments is improved.

The invention relates to the technical field of cables, in particular to an aluminum alloy cable which is composed of an aluminum alloy conductor, an inner insulating layer, a fireproof wrapping tape layer and an outer sheath. The outer sheath is prepared from the following raw materials in parts by weight: 50 to 60 parts of ethylene-vinyl acetate copolymer, 20 to 30 parts of linear low density polyethylene, 10 to 20 parts of polyolefin elastomer, 5 to 10 parts of PPO-g-MAH, 20 to 30 parts of carbon black, 1 to 10 parts of organic phosphorus flame retardant, 20 to 30 parts of crusting agent and 1 to 3 parts of antioxidant; the aluminum alloy cable provided by the invention is light in weight, high in strength and excellent in fireproof and flame-retardant performance.

The invention relates to the technical field of fire-resistant cables, and particularly discloses a high-flame-retardant and high-fire-resistant cable which is composed of a conductor, an insulating layer formed by magnesium oxide particles and an outer sheath, a spiral cavity is formed between the conductor and the outer sheath, the spiral cavity is formed by at least one spirally-wound insulating tape, and the insulating tape is arranged between the conductor and the outer sheath. The spiral cavity is filled with magnesium oxide particles and is compacted, the insulating tape is a high-temperature-resistant flexible mica tape, the mica tape is formed by compounding synthetic mica paper or phlogopite paper and alkali-free glass fiber cloth, and the spiral cavity formed by the spirally wound composite mica tape limits the displacement of the magnesium oxide particles. The inclined winding of the insulating tape constructs a support system with a stable structure and uniform pressure distribution, greatly improves the deformation resistance of the insulating layer under dynamic mechanical stress, effectively guarantees the integrity of an insulating medium, and effectively solves the technical problem that a magnesium oxide layer in a traditional mineral insulated cable is easy to loosen.

This power cable is provided with: a conductor; and an insulating layer that is provided so as to cover the outer periphery of the conductor and that is configured from a resin composition containing polyethylene. The insulating layer contains, among polyethylene, a crosslinked polyethylene that is insoluble in xylene at 120° C, and uncrosslinked polyethylene that can be eluted in xylene at 120° C. The uncrosslinked polyethylene has a number average molecular weight of 5000 to 25000.

Method of manufacturing a power cable comprising three cores and three filler profiles arranged in a stranded configuration, the method comprising: A) in a design stage of the power cable: A0) defining a nominal outer diameter of the cores, and defining a stranding pitch P of the cores, A1) determining, in a transverse plane of the power cable, a shape of at least one of the cores, A2) determining a cross-sectional shape of the filler profiles in a transverse section of a filler profile based on the shape determined in step A1), B) in the production stage of the power cable: B1) manufacturing each of the cores with the nominal outer diameter, B2) obtaining the filler profiles with the cross-sectional shape obtained in step A2), and B3) stranding the cores and the filler profiles with the stranding pitch P in an assembly machine.

The invention relates to the technical field of power cables, and particularly discloses a cable with a cable insulation layer and a preparation method thereof, and the cable comprises a conductor and an insulation layer wrapping the conductor. The preparation method comprises the following steps: S1, raw material pretreatment: preheating and softening the high-strength silicone rubber in a temperature interval of 120-150 DEG C; s2, a mixing procedure: adding an aluminum hydroxide flame retardant and ethylene-vinyl acetate copolymer resin into the pretreated high-strength silicone rubber; and S3, extruding and coating: applying the mixed composite material to the periphery of a conductor through an extruder, and controlling the extrusion temperature to be 140-170 DEG C. The cable can be used for power transmission in a high-temperature environment, and has the advantages that the flexibility and tear resistance are maintained in the high-temperature environment, and meanwhile, the long-term thermal stability is improved; in addition, the preparation method disclosed by the invention has the advantages of improving the compatibility of the filler and the matrix and improving the mechanical property of the cable.

The invention provides a heat dissipation flexible cable. The heat dissipation flexible cable comprises an inner sheath, a heat dissipation assembly, a separation assembly, a plurality of battery cell assemblies and a plurality of sliding assemblies, the inner sheath is provided with an accommodating cavity; the heat dissipation assembly is arranged around the periphery of the inner sheath; the separation assembly is located in the containing cavity and comprises a center piece and a plurality of separation pieces, the separation pieces are arranged around the periphery of the center piece, and a core cavity is formed between any two adjacent separation pieces; the battery core assemblies are located in the corresponding core cavities, each battery core assembly comprises an electric unit, a thermal expansion structure and a first elastic piece, and one side of each electric unit is elastically connected to the inner sheath through the corresponding first elastic piece; the plurality of sliding assemblies are arranged corresponding to the plurality of separators, the sliding assemblies are slidably arranged on the separators corresponding to the sliding assemblies, and the sliding assemblies are configured to install optical units; the thermal expansion structure is configured to be heated to drive the electric unit and the sliding assembly to move towards one side of the inner sheath to abut against the inner sheath, and the heat dissipation assembly can dissipate heat of the electric unit and the optical unit through the inner sheath.

The invention relates to a high-voltage cable for an industrial park, which is applied to the field of cables, and is characterized in that a waterproof cloth spirally wraps the outer side of a cable joint of a cable body, two ends of the waterproof cloth are pressed and sealed by a cloth pressing ring, and the cable joint is subjected to effective preliminary waterproof protection through the spiral waterproof cloth; deformation bodies and hard self-checking strips which are distributed in a staggered mode are arranged on the inner side of the waterproof cloth, the permeable cloth on the outermost side serves as a water plugging layer, absorbs external moisture firstly, seals the edge of the waterproof cloth after expanding, and effectively blocks entering of follow-up moisture, the middle deformation bodies serve as transition layers, so that the moisture is not prone to spreading deep, and the hard self-checking strips serve as detection layers, so that the detection efficiency is improved. When the cable connector meets water, the tension sensor is triggered to generate obvious data change, waterproof early warning is carried out on rear-end monitoring personnel, the innermost deformation body serves as a delay layer, time is provided for on-site processing of the personnel, and waterproof protection on the cable connector is effectively improved.

The invention relates to a low-ice-adhesion super-hydrophobic anti-icing coating as well as a preparation method and application thereof. Single-end amino fluorosilicone oil is grafted to the surface of an aldehyde group functionalized metal organic framework material through an amino-aldehyde group condensation reaction to obtain a hydrophobically modified metal organic framework material, the hydrophobically modified metal organic framework material is compounded with a synthesized fluorinated acrylate copolymer, and the coating is prepared through ultrasonic dispersion and spraying curing processes. According to the prepared low-ice-adhesion super-hydrophobic anti-icing coating, through the synergistic effect of fluorosilane grafting modification and a micro-nano structure, the excellent performance that the static water contact angle is larger than or equal to 160 degrees, the rolling angle is smaller than or equal to 2 degrees, and the ice adhesion strength is smaller than or equal to 20 kPa is achieved. Compared with a traditional anti-icing coating, a metal organic framework material functional modification strategy is adopted, the ice adhesion force is remarkably reduced while the mechanical stability of the coating is kept, and uniform film forming on the surfaces of base materials such as aluminum wires can be achieved through the spraying technology. The coating is suitable for anti-icing protection of the aluminum conductor of the power transmission line, and has the characteristics of long-acting icing resistance and low ice adhesion.

A hose for fluid transfer comprises a tubular inner hose for fluid transport and an outer hose part. The tubular inner hose has a corrugated inner surface defining a bore of the inner hose, and the inner hose has a permeable tubular inner sleeve located within its bore. An inner wall of the permeable tubular sleeve is substantially smooth. The permeable sleeve may comprise a polymer composite internal layer and a permeable outer layer wrapped around the internal layer. Methods of manufacturing such a hose are also described. Such hoses are suitable for cryogenic fluid transfer.

The invention relates to an anti-icing super-hydrophobic coating for an aluminum conductor as well as a preparation method and application of the anti-icing super-hydrophobic coating. Single-ended epoxy fluorosilicone oil is grafted to the surface of an amino-functionalized metal organic framework material through an epoxy-amino ring-opening reaction to obtain a hydrophobically modified metal organic framework material, the hydrophobically modified metal organic framework material has a flexible fluorocarbon chain shell, and according to the design, the mechanical strength of a coating is enhanced through a rigid framework of MOFs; the stress concentration is relieved by utilizing the flexibility of a molecular chain of the fluorosilicone oil. The modified metal organic framework material is further dispersed in a matrix composed of fluorine-containing epoxy resin and an amino fluorosilicone oil curing agent, a multi-layer micro-nano structure is formed through ultrasonic dispersion and spraying curing processes, and the super-hydrophobic coating is obtained. According to the coating, through the synergistic effect of fluorosilane grafting modification and a micro-nano structure, the excellent performance that the static water contact angle is larger than or equal to 155 degrees, the rolling angle is smaller than or equal to 4 degrees, the ice adhesion strength is smaller than or equal to 40 kPa, and the wear resistance is excellent is achieved.

The invention relates to the technical field of industrial production, and discloses an anti-aging corrosion-resistant photovoltaic cable, which comprises an insulating layer, uniformly distributed conductors are arranged on the inner diameter of the insulating layer, an insulating layer is arranged on the outer diameter of the insulating layer, a protective layer is arranged on the outer diameter of the insulating layer, and a sheath layer is arranged on the outer diameter of the protective layer. Reinforcing layers which are uniformly distributed are arranged between the sheath layer and the protective layer, the reinforcing layers are uniformly arranged and spirally wound on the surface of the protective layer, the insulating layer is made of a modified polyolefin material, and the protective layer is formed by blending fluoroplastic and an anti-aging additive. By adopting a multi-layer structure, the antioxidant can capture free radicals generated by thermo-oxidative aging, the 2-hydroxy-4-n-octyloxybenzophenone can absorb ultraviolet rays to reduce photo-oxidative damage, the protective layer contains a hindered amine light stabilizer and can circularly capture the free radicals and regenerate antioxidant groups, and the sheath layer contains polytetrafluoroethylene micro powder and prevents corrosion medium permeation. And the comprehensive effects of aging resistance and corrosion resistance are achieved.

The present invention relates to a polypropylene composition comprising (A) from 80.0 to 99.0 wt.-% of a copolymer of propylene and comonomer units selected from ethylene and alpha-olefins having from 4 to 12 carbon atoms having a total amount of comonomer units of from 10.0 to 16.0 wt %, based on the total amount of monomer units of the copolymer of propylene (A); a melt flow rate MFR2 of from 0.5 to 2.5 g / 10 min; a xylene cold soluble (XCS) fraction in a total amount of from 25.0 to 50.0 wt %, based on the total weight amount of the copolymer of propylene (A); and (B) from 1.0 to 20.0 wt.-% of an ethylene polymer having a density of from 915 to 960 kg / m3; and a melt flow rate MFR5 (190° C., 5 kg) of from 0.05 to 5.0 g / 10 min, an article comprising said polypropylene composition, preferably a cable comprising an insulation layer comprising said polypropylene composition, and the use of said polypropylene composition as cable insulation for medium and high voltage cables.

The invention relates to the technical field of power cables, and provides a flame-retardant power cable and a preparation method thereof. The flame-retardant power cable comprises a conductor, an insulating layer and a sheath layer which are sequentially arranged from inside to outside, and the sheath layer is prepared from, by weight, 40-60 parts of polyethylene, 60-80 parts of ethylene-vinyl acetate copolymer, 8-10 parts of compatilizer, 3-5 parts of auxiliaries, 15-20 parts of filler and 60-70 parts of flame retardant. The flame retardant is prepared from magnesium hydroxide, antimony trioxide, hydrated zinc borate and an aromatic bromine-containing compound in a mass ratio of 45: 8: 12: (25-30), and the number of bromine atoms of the aromatic bromine-containing compound is 6-8. According to the technical scheme, the problem of insufficient flame retardant property of the power cable in the prior art is solved.

The invention discloses a cold-resistant low-smoke airtight explosion-proof low-voltage power cable, and relates to the technical field of cables, an extrusion airtight assembly is arranged on the outer side of an inner insulating layer, a reinforced heat conduction wire is arranged in a middle supporting pipe, a one-way air pipe is installed in the middle of an air separation plate in a penetrating manner, and flexible isolation boxes are uniformly arranged on the outer side of the middle supporting pipe; the conductors are electrified to generate heat, carbon dioxide is heated to expand, the conductors and the filling layer are extruded, the inner protection layer is extruded to be tightly attached to the armor layers with high hardness, the gaps between the armor layers are sealed by the sealing rubber strips, and because the heated expansion rate of the carbon dioxide is larger than that of air, the bending supporting assembly is arranged on the outer side of the outer protection layer. The inner gap of the cable is extruded, so that the interior of the cable is more compact, the air in the cable is reduced, the air tightness in the cable is better, the cable is not easy to damage due to extrusion, and even if the cable is on fire at high temperature, carbon dioxide can inhibit combustion, so that fire spreading is better avoided.

The invention discloses a structured cable with self-cooling and state self-sensing functions, and belongs to the technical field of wires and cables. The cable comprises a conductor, an insulating layer, a functional layer, a sensing layer and an outer sheath from inside to outside. The functional layer is made of an elastic porous material, a spiral cavity is embedded in the functional layer to form a passive heat dissipation channel, and efficient heat dissipation is achieved through the chimney effect. The sensing layer is formed by compounding a transparent polymer base material and thermochromic microcapsules, and when the local temperature of the cable exceeds a safety threshold value, the color changes, so that visual positioning of an overheat fault point is realized. The heat dissipation and state sensing functions are deeply integrated in the cable body structure, external equipment and energy are not needed, the cable has the advantages of being simple in structure, low in cost, safe, reliable and the like, and the problems that a traditional cable depends on an external heat dissipation and monitoring system, so that the structure is complex, cost is high, and operation and maintenance are inconvenient are effectively solved.

The invention relates to the technical field of cables, and provides a polyethylene low-smoke halogen-free flame-retardant power cable which comprises a conductor, an insulating layer, a sheath layer, a halogen-free flame-retardant layer, a flame-retardant filling material and a cooling assembly, the insulating layer wraps the conductor, the halogen-free flame-retardant layer is arranged outside the insulating layer, and the sheath layer wraps the sheath layer. The halogen-free flame-retardant layer is wrapped by the sheath layer, the portion between the halogen-free flame-retardant layer and the insulating layer is filled with the flame-retardant filling material, the multiple cooling assemblies are arranged outside the sheath layer and used for cooling the sheath layer, and each cooling assembly comprises two cold water rings and a cold water plate. The cold water rings are detachably arranged outside the sheath layer, the cold water plate is arranged between the two cold water rings, the cold water plate is communicated with the cold water rings, and the cold water plate is in contact with the outside of the sheath layer. According to the technical scheme, the problem that a halogen flame retardant in the prior art is only suitable for low-temperature flame retardance and is difficult to meet the flame retardance requirement of the cable at high temperature is solved.