CN211404128U - Novel fire-resistant copper core crosslinked polyethylene power cable - Google Patents

Abstract

The utility model discloses a novel fire-resistant copper core crosslinked polyethylene power cable, which comprises a conductor and a fire-resistant layer, wherein the fire-resistant layer is arranged outside the circumference of the conductor, a cable core is arranged at the lower side of the conductor and the fire-resistant layer, an insulating layer is sleeved outside the circumference of the cable core, a sheath layer is sleeved outside the whole body of the fire-resistant layer and the insulating layer, a novel insulating layer is added outside the circumference of the cable core of the power cable, the novel insulating layer is mainly made of crosslinked polyethylene insulation, the thermal deformation is also very small besides the better electrical property of the polyethylene insulation, the insulating layer adopts crosslinked polyethylene insulation to have higher heat resistance and aging resistance, the working temperature can reach 90 ℃ and can keep the stable transmission, therefore, the transmission capacity of the cable core wrapped by the novel insulating layer is larger, and the insulating layer insulated by the crosslinked polyethylene has lower density and lighter weight.

Description

Novel fire-resistant copper core crosslinked polyethylene power cable

Technical Field

The utility model belongs to the technical field of the cable is relevant, concretely relates to novel fire-resistant type copper core crosslinked polyethylene power cable.

Background

The power cable is used for transmitting and distributing electric energy, is commonly used for urban underground power grids, power station leading-out lines, power supply inside industrial and mining enterprises and transmission lines under river-crossing seawater, is gradually increased in proportion in the power line, is a cable product used for transmitting and distributing high-power electric energy in a trunk line of a power system, and comprises various insulated power cables with voltage grades of 1-500KV and above.

The existing power cable technology has the following problems: the insulating layer of the inside parcel cable core of current power cable receives the restriction of material when using in production, make the heat resistance and the ageing resistance of insulating layer all relatively poor, the operating temperature restriction that can make whole power cable receive when using like this is great, make it can not use under some comparatively extreme conditions, and also relatively easy ageing of whole power cable after long slightly longer when using, and whole power cable can rise in the time of operational environment temperature and the energy of its consumption of the back that appears ageing, thereby can increase the energy loss, and traditional insulating layer factor of safety is less, it can produce dense smoke and harmful gas when burning, thereby can restrict whole power cable's application range.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel fire-resistant type copper core crosslinked polyethylene power cable to traditional power cable who proposes in solving above-mentioned background art can not use under some comparatively extreme conditions, and also ageing relatively easily after long a little longer when using, and whole power cable just appear the energy of its consumption behind ageing can uprise when operational environment temperature is higher, thereby can increase the problem of energy loss.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a novel fire-resistant type copper core crosslinked polyethylene power cable, includes conductor and flame retardant coating, the circumference outside at the conductor is installed to the flame retardant coating, the downside of conductor and flame retardant coating is provided with the cable core, the insulating layer has been cup jointed to the circumference outside of cable core, the restrictive coating has been cup jointed to the whole outside of flame retardant coating and insulating layer, be connected with the non-woven fabrics on the circumference inner wall of restrictive coating around the band, the non-woven fabrics is provided with the stopping around the band circumference inside and the clearance between flame retardant coating and the insulating layer circumference outside.

Preferably, the number of the conductors is two, the two conductors are identical in shape, size and structural composition, and the fire-resistant layers are sleeved on the circumferential outer walls of the two conductors.

Preferably, the cable core is provided with three altogether, three the shape size and the structure of cable core constitute equally the same, three all cup joint the insulating layer on the circumference outer wall of cable core.

Preferably, the cross-sectional shapes of the conductor and the cable core are both circular, and the cross-sectional area of the conductor is smaller than that of the cable core.

Preferably, the insulation layer is made of cross-linked polyethylene, and the maximum working temperature of the insulation layer is 90 ℃.

Preferably, the cross-sectional shapes of the insulating layer, the fire-resistant layer and the sheath layer are all circular rings, and the annular thickness of the sheath layer is greater than that of the insulating layer and the fire-resistant layer.

Compared with the prior art, the utility model provides a novel fire-resistant type copper core crosslinked polyethylene power cable possesses following beneficial effect:

1. the utility model adds a novel insulating layer outside the circumference of the cable core of the power cable, and the novel insulating layer mainly adopts crosslinked polyethylene insulation, the thermal deformation is also very small while the good electrical property of the polyethylene insulation is kept, the insulation layer adopts the cross-linked polyethylene insulation, has higher heat resistance and aging resistance, the working temperature can reach 90 ℃, the stable transmission can be kept, therefore, the cable core wrapped by the novel insulating layer has larger transmission capacity, the density of the insulating layer insulated by the crosslinked polyethylene is lower, and the weight is lighter, and the insulating layer insulated by adopting the crosslinked polyethylene has small dielectric coefficient, thus reducing loss, generating no or little dense smoke and harmful gas during combustion, therefore, the whole power cable can be safer in use and more efficient in transmission;

2. this novel power cable has mica tape promptly flame retardant coating around its inside conductor outward, the flame retardant coating adopts the mica tape to wind the package because the mica sheet of mica tape has high temperature resistance and has insulating effect again in the conductor outside, the flame retardant coating that adopts the mica tape can protect its operation for a certain time like this in the conflagration, thereby give when fleing people and play some power consumption time more, consequently, the flame retardant coating cable that adopts the mica tape can be suitable for more with personnel intensive place, thereby increase whole power cable's safety in utilization.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description, do not constitute a limitation of the invention, in which:

fig. 1 is a schematic view of the external three-dimensional structure of a novel fire-resistant copper core crosslinked polyethylene power cable provided by the utility model;

fig. 2 is a schematic view of the internal cross-sectional structure of the novel fire-resistant copper core crosslinked polyethylene power cable provided by the utility model;

in the figure: 1. a sheath layer; 2. a non-woven fabric wrapping tape; 3. an insulating layer; 4. a cable core; 5. a conductor; 6. a refractory layer; 7. and (3) a filling material.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a novel fire-resistant copper core crosslinked polyethylene power cable comprises a conductor 5 and a fire-resistant layer 6, wherein the fire-resistant layer 6 is arranged outside the circumference of the conductor 5, the fire-resistant layer 6 is wrapped outside the conductor 5 by a mica tape because mica sheets of the mica tape have high temperature resistance and an insulating effect, so that the fire-resistant layer 6 adopting the mica tape can protect the fire-resistant layer from running for a certain time in a fire disaster, and a certain electricity utilization time is provided for people to escape, therefore, the fire-resistant layer 6 cable adopting the mica tape can be more suitable for places denser than people, so that the use safety of the whole power cable is improved, cable cores 4 are arranged on the lower sides of the conductor 5 and the fire-resistant layer 6, an insulating layer 3 is sleeved outside the circumference of the cable cores 4, the insulating layer 3 is mainly made of crosslinked polyethylene insulation, and keeps the good electrical performance of the polyethylene insulation, the thermal deformation is also very small, two conductors 5 are arranged, the shape, size and structure composition of the two conductors 5 are the same, the fire-resistant layer 6 is sleeved on the outer circumferential wall of the two conductors 5, three cable cores 4 are arranged, the shape, size and structure composition of the three cable cores 4 are the same, the insulating layer 3 is sleeved on the outer circumferential wall of each cable core 4, the sheath layer 1 is sleeved outside the whole of the fire-resistant layer 6 and the insulating layer 3, the sheath layer 1 is coated on the outermost layer of the cable to play a role in protecting, mainly playing a role in mechanical reinforcement and corrosion protection, protecting the cable from being damaged and meeting the requirements of various use conditions and environments, the inner circumferential wall of the sheath layer 1 is connected with the non-woven fabric wrapping tape 2, the filler 7 is arranged in a gap between the inner circumferential part of the non-woven fabric wrapping tape 2 and the outer circumferential parts of the fire-resistant layer 6 and the insulating layer 3, and the filler, the structure is stable, and the filler of the cable also plays the roles of water resistance, flame retardance, fire resistance and the like.

A novel fire-resistant copper core cross-linked polyethylene power cable, the cross-sectional shapes of a conductor 5 and a cable core 4 are both circular, the cross-sectional area of the conductor 5 is smaller than that of the cable core 4, the cut conductor 5 and the cable core 4 are separated by a filler 7, thus the situation that the contact of the conductor 5 with a fire-resistant layer 6 and the cable core 4 with an insulating layer 3 influences the stability of the transmission work of the conductor 5 and the cable core can be avoided, the whole power cable can work stably, the cross-sectional shapes of the insulating layer 3, the fire-resistant layer 6 and a sheath layer 1 are all circular, the annular thickness of the sheath layer 1 is larger than that of the insulating layer 3 and the fire-resistant layer 6, the cross-sectional shape of the molded conductor 5 is circular, the compressed circular conductor 5 is used for improving the fire resistance, if a compressed fan shape is adopted, the fire-resistant layer 6, namely, is easy to, thereby influence fire behaviour, wherein insulating layer 3 adopts for crosslinked polyethylene is insulating, and the highest operating temperature of insulating layer 3 is 90 ℃, and insulating layer 3 adopts crosslinked polyethylene to insulate and has higher heat resistance and ageing resistance, and operating temperature can reach 90 ℃ and can keep transmitting stably, consequently, the cable core 4 transmission capacity after 3 parcels of insulating layer through this neotype is bigger, and adopts 3 densities of insulating layer of crosslinked polyethylene insulating less, and weight is lighter simultaneously.

The utility model discloses a theory of operation and use flow: after the utility model is installed, the technological process of the novel power cable during production and use is conductor 5 wire drawing annealing → conductor 5 stranding → wrapping mica tape → insulating extrusion → steam crosslinking → cabling → oversheath extrusion → finished product inspection → packing and delivery, when in production, after conductor 5 wire drawing annealing, conductor 5 needs to be stranded on the next step, so that conductor 5 is finally formed into a cylinder, the cross section of formed conductor 5 is circular, conductor 5 adopts the pressing circle to improve the fire resistance, if adopting the pressing sector, the mica layer, namely fire resistance layer 6 is easy to scratch and damage during production, thereby influencing the fire resistance, after the fire resistance layer 6 outside the conductor 5 is wrapped, the insulating layer 3 is required to be wrapped and produced to the outside of the cable core 4 in the same way, then the sheath layer 1 with the non-woven fabric tape 2 on the inner wall is required to be produced and sheathed and connected to the outside of the cable core 4 after combination, then filling the gap with the filler 7, forming the filler 7 into a finished power cable after forming, then carrying out quality inspection on the produced finished power cable, packaging the finished power cable after the inspection is determined to be a qualified product, and adding a novel insulating layer 3 outside the circumference of a cable core 4 of the power cable, wherein the novel insulating layer 3 mainly adopts crosslinked polyethylene insulation, has small thermal deformation besides good electrical performance of the polyethylene insulation, has higher heat resistance and aging resistance due to the crosslinked polyethylene insulation, has a working temperature of 90 ℃ and can keep stable transmission, so that the transmission capacity of the cable core 4 wrapped by the novel insulating layer 3 is larger, and the density of the insulating layer 3 insulated by the crosslinked polyethylene is smaller, while being lighter in weight.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (2)

1. The utility model provides a novel fire-resistant type copper core crosslinked polyethylene power cable, includes conductor (5) and flame retardant coating (6), its characterized in that: the circumference outside at conductor (5) is installed in flame retardant coating (6), the downside of conductor (5) and flame retardant coating (6) is provided with cable core (4), insulating layer (3) have been cup jointed to the circumference outside of cable core (4), restrictive coating (1) have been cup jointed to the whole outside of flame retardant coating (6) and insulating layer (3), be connected with the non-woven fabrics on the circumference inner wall of restrictive coating (1) around band (2), the non-woven fabrics is provided with stopping (7) around the inside clearance between flame retardant coating (6) and insulating layer (3) circumference outside of band (2) circumference, conductor (5) are provided with two altogether, two the shape size and the structure of conductor (5) constitute the homogeneous phase, two all refractory coating (6) have all been cup jointed on the circumference outer wall of conductor (5), cable core (4) are provided with threely altogether the shape size and the structure of cable core (4) constitute homogeneous phase, it is three all cup jointed insulating layer (3) on the circumference outer wall of cable core (4), the cross sectional shape of conductor (5) and cable core (4) is circular, the cross sectional area of conductor (5) is less than the cross sectional area of cable core (4), what insulating layer (3) adopted is that crosslinked polyethylene is insulating, the highest operating temperature of insulating layer (3) is 90 ℃.

2. The novel fire-resistant copper core crosslinked polyethylene power cable according to claim 1, characterized in that: the cross-sectional shapes of the insulating layer (3), the fire-resistant layer (6) and the sheath layer (1) are all circular rings, and the annular thickness of the sheath layer (1) is larger than that of the insulating layer (3) and the fire-resistant layer (6).

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