CN115083674A

CN115083674A - Cold-proof shielding type power cable

Info

Publication number: CN115083674A
Application number: CN202210884086.3A
Authority: CN
Inventors: 王义军; 苏培生; 李广凯; 赵宪帅; 段洋洋; 高静; 张晶; 宋佳
Original assignee: Yanggu New Pacific Cable Co ltd
Current assignee: Yanggu New Pacific Cable Co ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2022-09-20

Abstract

The invention belongs to the technical field of power cable application, and particularly relates to a cold-proof shielding type power cable. Including the conductor that is equilateral triangle form and the insulating layer of crowded package outside the conductor, rock wool rope in the middle of having circumscribed between the conductor, conductor and middle rock wool rope parcel have the PFA resin layer, the edge setting of PFA resin layer is provided with the recess that three interval set up, the recess sets up between two adjacent conductors, the recess makes PFA resin layer laminating conductor and middle rock wool rope's outer fringe setting, the PFA resin layer is provided with the elastic layer outward, the elastic layer is provided with the shielding layer outward, the aerogel layer has been wrapped up outward to the shielding layer, the aerogel layer parcel has the heat preservation outward, the heat preservation is provided with the winding layer outward, the winding layer is provided with the surrounding layer outward, wherein, the material of surrounding layer is for there being fire-retardant polyether type thermoplastic polyurethane elastomer rubber of steamed.

Description

Cold-proof shielding type power cable

Technical Field

The invention belongs to the technical field of power cable application, and particularly relates to a cold-proof shielding type power cable.

Background

The power cable is used for transmitting and distributing electric energy, and is commonly used for urban underground power grids, power station leading-out lines, power supply inside industrial and mining enterprises and power transmission lines under river-crossing seawater. In the power lines, the cable is increasing in specific gravity. Power cables are cable products used in the trunk lines of power systems to transmit and distribute high power electrical energy, including various voltage classes, 1-500KV and above, and various insulated power cables.

The shielding cable is formed by adding a shielding layer outside the transmission cable and has the capability of resisting external electromagnetic interference. The shielding layer of the cable is mostly woven into a netted metal wire or a metal film, and various modes such as single shielding, multi-shielding and the like are provided. Single shield refers to a single shielding mesh or film in which one or more wires may be wrapped. The multi-shielding mode is that a plurality of shielding nets or shielding films are arranged in a cable. Some are used to isolate electromagnetic interference between wires, and some are double-layer shields used to enhance shielding effect. The shielding layer is grounded to isolate the induced interference voltage of the external connection to the conducting wire.

With the rapid development of economy in China, power grids are distributed in all corners of China, at present, the use amount of cables in alpine regions is gradually increased, and the number of cold storages for fruit and vegetable fresh-keeping is large. The cable sheath of the cable used in the alpine region and the refrigeration house is very easy to break due to low temperature, so that the conductor is exposed and the risk of electric leakage is generated; in addition, the conventional cable is easy to harden in a low-temperature environment, which is very unfavorable for construction, and the sheath is easy to break and wastes cables in the construction process.

Disclosure of Invention

Aiming at the technical problems of the existing chair seats for children to learn, the invention provides the cold-proof shielding type power cable which is reasonable in design, convenient to process and capable of ensuring that the flexibility of the cable can be kept at a low temperature.

In order to achieve the above object, the invention adopts the technical scheme that the invention provides a cold-proof shielding type power cable, which comprises conductors distributed in an equilateral triangle shape and an insulating layer extruded outside the conductors, a middle rock wool rope is externally tangent between the conductors, PFA resin layers are wrapped outside the conductors and the middle rock wool rope, the edge of the PFA resin layer is provided with three grooves which are arranged at intervals and are arranged between two adjacent conductors, the grooves enable the PFA resin layer to be attached to the conductor and the outer edge of the middle rock wool rope to be arranged, an elastic layer is arranged outside the PFA resin layer, a shielding layer is arranged outside the elastic layer, an aerogel layer is wrapped outside the shielding layer, a heat insulation layer is wrapped outside the aerogel layer, a winding layer is arranged outside the heat insulation layer, an outer wrapping layer is arranged outside the winding layer, the outer cladding layer is made of halogen-free flame-retardant polyether type thermoplastic polyurethane elastomer rubber.

Preferably, the insulating layer is made of cross-linked polyethylene.

Preferably, the elastic layer is made of modified butadiene rubber.

Preferably, the heat-insulating layer is made of heat-insulating cotton.

Preferably, the material of the winding layer is an iron powder resin composite tape.

Preferably, an auxiliary aerogel layer is arranged between the conductor and the insulating layer, and a graphene nylon composite belt is wound outside the auxiliary aerogel layer.

Compared with the prior art, the invention has the advantages and positive effects that,

1. the invention provides a cold-proof shielding type power cable, which is characterized in that the structure of the existing power cable is improved, heat emitted by a conductor is reduced by using a heat insulation material, and meanwhile, a low-temperature resistant material is used for wrapping, so that the condition that the wrapping material of the conductor has cold and hot poles is avoided, and the service life of the power cable is prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

Fig. 1 is a schematic structural view of a cold-proof shielding type power cable provided in embodiment 1;

in the above figures, 1 is a conductor; 2. an auxiliary aerogel layer; 3. a graphene nylon composite tape; 4. an insulating layer; 5. a PFA resin layer; 6. an elastic layer; 7. a shielding layer; 8. an aerogel layer; 9. a heat-insulating layer; 10. a winding layer; 11. an outer cladding; 12. the middle rock wool rope.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.

Embodiment 1, as shown in fig. 1, this embodiment provides a cold-proof shielding type power cable, and it is found through research that when the power cable is used in a low-temperature area, the main cause of the breakage is the problem of heat insulation, when the power cable is used, the conductor 1 of the power cable generates heat, while the inner side of the outer cladding 11 is affected by heat and the outer side is affected by cold, so that the material of the power cable is easy to age, and when the power cable is used for a long time, the breakage occurs, and therefore, in order to solve the above problems, the cold-proof shielding type power cable provided by this embodiment is improved from two aspects: firstly, the flexibility is improved; secondly, the heat insulation performance is improved, and the heat quantity from the conductor 1 is reduced. Therefore, the cold-proof shielding type power cable provided by the embodiment comprises conductors 1 distributed in an equilateral triangle shape and an insulating layer 4 extruded outside the conductors 1, wherein in the embodiment, the distribution in the equilateral triangle shape means that the central points of the cross sections of the three conductors 1 are positioned at the end points of the equilateral triangle, and the purpose of the arrangement is mainly to increase the gaps among the conductors 1 and reduce the extrusion. The intermediate rock wool rope 12 is circumscribed between the conductors 1 for two purposes, namely, the tensile strength of the whole cable is improved, and the flexibility of the cable is improved. And the rock wool rope has a flame retardant effect, so that the use requirement is met.

In order to wrap the conductor 1 and the middle rock wool rope 12, the conductor 1 and the middle rock wool rope 12 are wrapped with a PFA resin layer 5, the PFA resin layer 5 is a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, the PFA resin has chemical corrosion resistance and is corrosion-resistant to all chemicals at the long-term use temperature of-80 to-260 ℃, the friction coefficient is lower in plastics, the PFA resin has good electrical property, the electrical insulation property is not influenced by temperature, and the PFA resin can be used as a protective layer of the conductor 1 to protect the conductor 1.

In consideration of the problem of flexibility, in the embodiment, the shape formed by the PFA resin layer 5 is not a complete circle, three grooves are arranged at intervals at the edge of the PFA resin layer 5, and the grooves are arranged between two adjacent conductors 1, so that the grooves enable the PFA resin layer 5 to be attached to the conductors 1 and the outer edge of the middle rock wool rope 12, meanwhile, in order to increase the flexibility, the elastic layer 6 is arranged outside the PFA resin layer 5, the material of the elastic layer 6 is modified butadiene rubber, and the modified butadiene rubber has the characteristics of high elasticity, good wear resistance, good cold resistance, low heat generation, good bending resistance, good dynamic performance and the like.

The shielding layer 7 is provided outside the elastic layer 6, and the shielding layer 7 functions as the conventional shielding layer 7, so that it will not be described in detail herein, and the shielding layer 7 is a metal wire layer woven in a mesh shape in order to improve flexibility.

In order to achieve the purpose of further heat insulation, in the embodiment, the aerogel layer 8 wraps the shielding layer 7, the aerogel layer 8 has excellent heat insulation effect and flexibility, meanwhile, the heat insulation layer 9 wraps the aerogel layer 8, and the heat insulation layer 9 is made of heat insulation cotton, so that the temperature insulation of the conductor 1 is realized by the cooperation of multiple materials. Because of the characteristics of aerogel and heat preservation cotton, need carry out unclean father to aerogel and heat preservation cotton, for this reason, be provided with winding layer 10 outside heat preservation 9, the material of winding layer 10 is the compound area of iron powder resin, in this embodiment, the compound area of iron powder resin is selected for use in winding layer 10 mainly by two purposes, the first purpose is exactly to restrain aerogel and heat preservation cotton, the compound winding layer 10 of iron powder resin of the second purpose can absorb the noise interference that comes from the outside and change into the heat, and be provided with surrounding layer 11 outside its winding layer 10, the heat that its production is not enough produces ageing to surrounding layer 11, but can improve the winter protection effect to a certain extent, and then improve the cold-resistant effect of surrounding layer 11, and the material of surrounding layer 11 is halogen-free fire-retardant polyether type thermoplastic polyurethane elastomer rubber. The halogen-free flame-retardant polyether type thermoplastic polyurethane elastomer rubber is the conventional TPU, and can meet the requirements of keeping good elasticity, flexibility and other physical properties at minus 40 ℃, so that effective matching of flexibility and heat insulation is realized through matching of multiple layers, and the problem of cold resistance of the conventional power cable is solved.

In order to further insulate heat, in the present embodiment, an auxiliary aerogel layer 2 is provided between the conductor 1 and the insulating layer 4, and a graphene nylon composite tape 3 is wound around the auxiliary aerogel layer 2. The insulating layer 4 is extruded outside the graphene nylon composite belt 3, the graphene nylon composite belt 3 has two purposes, one is used for binding the auxiliary aerogel layer 2, and the other purpose is matched with the shielding layer 7, so that double shielding is realized, and the shielding effect is improved.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.

Claims

1. A cold-proof shielding type power cable comprises conductors distributed in an equilateral triangle shape and an insulating layer extruded outside the conductors, it is characterized in that a middle rock wool rope is externally tangent between the conductors, PFA resin layers are wrapped outside the conductors and the middle rock wool rope, the edge of the PFA resin layer is provided with three grooves which are arranged at intervals and are arranged between two adjacent conductors, the grooves enable the PFA resin layer to be attached to the conductor and the outer edge of the middle rock wool rope to be arranged, an elastic layer is arranged outside the PFA resin layer, a shielding layer is arranged outside the elastic layer, an aerogel layer is wrapped outside the shielding layer, a heat insulation layer is wrapped outside the aerogel layer, a winding layer is arranged outside the heat insulation layer, an outer wrapping layer is arranged outside the winding layer, the outer cladding layer is made of halogen-free flame-retardant polyether type thermoplastic polyurethane elastomer rubber.

2. The insulated cold-proof power cable as claimed in claim 1, wherein the insulating layer is made of cross-linked polyethylene.

3. The cold-proof shielded power cable as claimed in claim 2, wherein the elastic layer is made of modified butadiene rubber.

4. The cold-proof shielding type power cable as claimed in claim 3, wherein the insulation layer is made of insulation cotton.

5. The cold-proof shielding type power cable as claimed in claim 4, wherein the winding layer is made of iron powder resin composite tape.

6. The cold-proof shielding type power cable according to any one of claims 1 to 5, wherein an auxiliary aerogel layer is disposed between the conductor and the insulating layer, and a graphene nylon composite tape is wound outside the auxiliary aerogel layer.