CN118197693A - Full-water-blocking rat-proof and termite-proof medium-voltage cable - Google Patents
Full-water-blocking rat-proof and termite-proof medium-voltage cable Download PDFInfo
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- CN118197693A CN118197693A CN202410415387.0A CN202410415387A CN118197693A CN 118197693 A CN118197693 A CN 118197693A CN 202410415387 A CN202410415387 A CN 202410415387A CN 118197693 A CN118197693 A CN 118197693A
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- shielding layer
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- 239000010410 layer Substances 0.000 claims abstract description 72
- 239000004020 conductor Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- -1 polypropylene Polymers 0.000 claims abstract description 31
- 239000004698 Polyethylene Substances 0.000 claims abstract description 21
- 229920000573 polyethylene Polymers 0.000 claims abstract description 21
- 239000011241 protective layer Substances 0.000 claims abstract description 18
- 239000002131 composite material Substances 0.000 claims abstract description 17
- 239000004743 Polypropylene Substances 0.000 claims abstract description 15
- 229920003023 plastic Polymers 0.000 claims abstract description 15
- 239000004033 plastic Substances 0.000 claims abstract description 15
- 229920001155 polypropylene Polymers 0.000 claims abstract description 15
- 239000004677 Nylon Substances 0.000 claims abstract description 12
- 229920001778 nylon Polymers 0.000 claims abstract description 12
- 239000003292 glue Substances 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims description 14
- 239000004065 semiconductor Substances 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 abstract description 17
- 241000257303 Hymenoptera Species 0.000 abstract description 6
- 241000699670 Mus sp. Species 0.000 abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 238000009413 insulation Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000006227 byproduct Substances 0.000 description 4
- 229920003020 cross-linked polyethylene Polymers 0.000 description 4
- 239000004703 cross-linked polyethylene Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 229920006255 plastic film Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 241000256602 Isoptera Species 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 235000006650 Syzygium cordatum Nutrition 0.000 description 1
- 240000005572 Syzygium cordatum Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005253 cladding Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 229920000098 polyolefin Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Insulated Conductors (AREA)
Abstract
The invention discloses a full-water-blocking rat and termite-proof medium-voltage cable, which comprises a conductor, a conductor shielding layer sleeved outside the conductor, a polypropylene insulating layer arranged outside the conductor shielding layer, a groove insulating shielding layer arranged outside the polypropylene insulating layer, an aluminum-plastic composite belt arranged outside the groove insulating shielding layer, a polyethylene sheath arranged on the outer layer of the aluminum-plastic composite belt, and a nylon protective layer arranged on the outer layer of the polyethylene sheath, wherein the polyethylene protective layer is arranged on the outer layer of the polyethylene sheath; wherein, the gap between the conductor shielding layer and the conductor is filled with water-blocking glue; realize horizontal and vertical full water blocking, greatly improved reliability and stability of the product. And a nylon protective layer with certain hardness is extruded on the outermost layer, the Shore hardness of the nylon protective layer reaches more than 65, so that organisms such as mice and ants cannot bite down, and the service life and the safety and reliability of the cable are ensured.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution, in particular to a full-water-blocking rat-proof and termite-proof medium-voltage cable.
Background
In recent years, with the rapid development of the national power industry, the demand of the power cable is continuously increased, the power cable is taken as one of the largest matching industries in national economy, is widely applied to large-scale power stations and power transmission line processes, subways, cross-river, cross-sea and other occasions, when the power cable is laid in a humid or water environment, the higher requirement on the water blocking performance of the cable is put forward, and along with the deepening of research and understanding of insulating water absorption and water trees, people are increasingly aware of the importance of the water blocking performance on the medium-voltage power cable. The invention provides a full-water-blocking rat-proof and termite-proof medium-voltage power cable.
The conventional medium-voltage power cable basically has no water blocking performance, and a small part of cable conductors are blocked by water-swelling materials such as water blocking yarns, water blocking belts and the like, which are filled in the conductor gaps.
Most of common medium-voltage power cable insulation adopts chemical crosslinking polyethylene (XLPE) materials to crosslink, acetophenone, alpha-methyl-styrene, methane and other byproducts can be generated in the process of crosslinking, and if the byproducts are not removed in time, the service life of the cable body can be influenced. At the same time, the crosslinked polyethylene material cannot be recycled and the subsequent processing thereof is a difficult problem, which will present a great challenge to the ring.
The metal shielding of the medium-voltage power cable generally adopts a mode of insulating shielding outer sparse winding copper wires and winding copper strips, in order to achieve a water blocking effect, the water blocking effect is usually achieved by winding semi-conductive water blocking strips between the insulating shielding and the metal shielding, the semi-conductive water blocking strips are added with conductive substances such as graphite, carbon black and the like on the basis of the insulating water blocking strips, the local volume resistivity of the strips is larger due to the uneven granularity and dispersibility of the graphite and the carbon black, and the cable is subjected to partial discharge and heating phenomena during long-term operation, so that an insulating shielding layer is ablated, and cable breakdown faults occur.
The medium-voltage power cable outer sheath is generally made of polyvinyl chloride (PVC), polyethylene (PE) and low-smoke halogen-free flame-retardant polyolefin (LZSH) materials, but the materials do not have the function of preventing mice and ants, when the cable is laid in an environment with the mice and ants, long-time use can occur that the cable sheath is gnawed and eroded by the mice and ants, and the cable fails due to the loss of protection function.
Disclosure of Invention
The invention aims to provide a full-water-blocking rat and termite-proof medium-voltage cable, solves the technical problems in the background art, and is used for improving the water-blocking performance and reliability of a medium-voltage power cable.
In order to solve the technical problems, the invention adopts the following technical scheme:
The invention provides a full-water-blocking rat and termite-proof medium-voltage cable, which comprises a conductor, a conductor shielding layer sleeved outside the conductor, a polypropylene insulating layer arranged outside the conductor shielding layer, a groove insulating shielding layer arranged outside the polypropylene insulating layer, an aluminum-plastic composite belt arranged outside the groove insulating shielding layer, a polyethylene sheath arranged on the outer layer of the aluminum-plastic composite belt, and a nylon protective layer arranged on the outer layer of the polyethylene sheath, wherein the polyethylene protective layer is arranged on the outer layer of the polyethylene sheath;
Wherein, the gap between the conductor shielding layer and the conductor is filled with water-blocking glue;
the outer peripheral wall of the groove insulating shielding layer is uniformly provided with a circumference of groove, and the groove is filled with semiconductor resistor water powder.
Further, the conductor is formed by layering and twisting a plurality of conductor monofilaments.
Still further, the conductor shielding layer is a semiconductor shielding layer;
Or/and the semiconductor semi-conductive shielding layer is made of extrudable semi-conductive material;
or/and the semiconductor semi-conductive shielding layer is a wrapping semi-conductive tape and an extrusion semi-conductive layer.
Still further, the groove of the groove insulation shielding layer is filled with semiconductor resistor water powder; and the outside of the groove is longitudinally covered by the aluminum-plastic composite band to prevent the semiconductive water-blocking powder from leaking.
Compared with the prior art, the invention has the beneficial technical effects that:
1. According to the invention, water-swelling materials such as water-blocking yarns, water-blocking strips and water-blocking powder are replaced by filling water-blocking glue, a plurality of conductor monofilaments are layered and stranded and molded by adopting a frame stranding machine according to a normal stranding mode, the prepared water-blocking glue is extruded into monofilament gaps at a layered stranding parallel line position through a special extrusion molding die, a stranded conductor is obtained, the water-blocking glue can fill the conductor gaps, the possibility of water inflow of the conductor is completely prevented, and the water-blocking performance and the production efficiency of the conductor are greatly improved.
2. The invention adopts the modified polypropylene (PP) insulating material, and the indexes of temperature resistance grade and mechanical property are higher than those of crosslinked polyethylene, thus greatly improving the reliability of the cable. And the method does not need crosslinking, does not need a crosslinking pipeline, does not generate any by-product, greatly reduces energy consumption, can be recycled and reused, and is very environment-friendly.
3. The invention designs the groove in the insulating shielding layer, fills the semi-conductive resistor water powder in the groove, adopts a single-sided aluminum-plastic composite belt for metal shielding, designs the thickness of the aluminum belt according to the short-circuit current of the system, longitudinally wraps the aluminum belt on the surface of the groove-shaped insulating shielding layer, and softens the plastic film through a hot air gun to bond the plastic film. The structure has the advantages that one side without the film-covered aluminum belt is only attached to the insulating shielding surface, local heating and other phenomena caused by overlarge contact resistance can not occur, and the other side of the aluminum-plastic composite belt is adhered to the polyethylene sheath to form the composite sheath. Meanwhile, the aluminum strip forms a sealing structure in the radial direction, and has an excellent radial water blocking effect. When water enters transversely, the semi-conductive resistance water powder in the insulation shielding groove can expand rapidly when meeting water, and forms a water blocking barrier together with the aluminum strip, so that transverse and longitudinal full water blocking is realized, and the reliability and stability of the product are greatly improved.
4. According to the invention, the nylon protective layer with certain hardness is extruded on the outer layer of the sheath, the Shore hardness of the nylon protective layer is more than 65, so that organisms such as mice and ants cannot bite down, and the service life and the safety and reliability of the cable are ensured.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a schematic view of the internal body structure of the cable of the present application taken entirely along the radial direction of the outer cladding;
fig. 2 is an enlarged schematic view of the structure of the cable insulation shield groove layer according to the present application.
Reference numerals illustrate: 1. a conductor; 2. water-blocking glue; 3. a conductor shielding layer; 4. a polypropylene insulating layer; 5. a groove insulating shielding layer; 6. semi-conductive resistor water powder; 7. an aluminum-plastic composite belt; 8. a polyethylene sheath; 9. nylon protective layer.
Detailed Description
As shown in fig. 1-2, this embodiment discloses a full-water-blocking rat-proof and termite-proof medium voltage cable, which comprises an insulated wire core;
the insulated wire core comprises a conductor 1, a conductor semi-conductive shielding layer (which can be extruded with semi-conductive materials or wrapped with semi-conductive strips and extruded with semi-conductive layers), a polypropylene insulating layer and an insulated semi-conductive shielding layer, wherein the conductor semi-conductive shielding layer is arranged on the outer layer of the conductor 1;
The insulation shield is designed into a groove structure, the groove is filled with semiconductor resistor water powder, the outer layer is longitudinally covered with an aluminum-plastic composite belt, then a polyethylene protective layer is extruded and covered, the aluminum-plastic composite belt and the polyethylene protective layer form a metal composite protective layer, and the polyethylene outer layer is extruded and covered with a high-hardness nylon protective layer. The invention has simple manufacturing process, has the performances of full water resistance, rat and termite release, environmental protection and the like, and greatly improves the reliability and safety of the medium-voltage power cable.
The method comprises the steps of filling water-blocking glue at gaps of conductor monofilaments to block water of the conductor, layering and twisting the plurality of monofilaments by a frame twisting machine according to a regular twisting mode, extruding the prepared water-blocking glue into the gaps of the monofilaments at layering and twisting positions by a special extrusion molding die to obtain a twisted conductor, wherein the water-blocking glue can fill the gaps of the conductor, so that the possibility of water inflow of the conductor is completely prevented, and the water-blocking performance and the production efficiency of the conductor are greatly improved.
The modified polypropylene (PP) insulating material is adopted, and the indexes of temperature resistance grade and mechanical property of the modified PP insulating material are higher than those of crosslinked polyethylene, so that the reliability of the cable is greatly improved. And the method does not need crosslinking, does not need a crosslinking pipeline, does not generate any by-product, greatly reduces energy consumption, can be recycled and reused, and is very environment-friendly.
The invention designs a groove structure in an insulating shielding layer, semiconductor resistor water powder is filled in the groove, a single-sided aluminum-plastic composite belt is adopted for metal shielding, the thickness of the aluminum belt is designed according to the short-circuit current of a system, the aluminum belt is longitudinally wrapped on the surface of the groove-shaped insulating shielding layer, a plastic film is softened by a hot air gun to be bonded, and the other side of the aluminum-plastic composite belt is bonded with a polyethylene sheath to form a composite sheath. The aluminum strip without the film is only attached to the insulating shielding surface, so that the phenomena of local heating and the like caused by overlarge contact resistance can not occur, and meanwhile, the aluminum strip forms a sealing structure in the radial direction, so that the aluminum strip has an excellent radial water blocking effect. When water enters transversely, the semi-conductive resistance water powder in the insulation shielding groove can expand rapidly when meeting water, and forms a water blocking barrier together with the aluminum strip, so that transverse and longitudinal full water blocking is realized, and the reliability and stability of the product are greatly improved.
The outermost layer is extruded with a nylon protective layer with certain hardness, the Shore hardness of the nylon protective layer reaches more than 65, so that organisms such as mice and ants cannot bite down, and the service life and the safety and reliability of the cable are ensured.
The invention discloses a full water-blocking rat and termite-proof medium-voltage power cable, referring to fig. 1, comprising a tightly-pressed stranded conductor 1 for transmitting current and connecting accessories; the conductor gap is filled with water-blocking glue 2 (a semi-conductive tape can be wrapped outside the conductor); the conductor 1 is externally coated with a conductor shielding layer 3 for homogenizing an electric field by adopting a three-layer coextrusion process; a polypropylene (PP) insulating layer 4; a groove insulating shield layer 5; the groove insulating shielding layer is filled with semiconductive water-blocking powder 6; longitudinally wrapping an aluminum strip metal shielding layer 7 outside the groove insulation shielding layer; the outer layer is extruded with a polyethylene protective layer 8; and a rat and termite resistant nylon layer 9 is extruded outside the polyethylene protective layer.
The foregoing embodiments are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to which the present invention pertains should fall within the scope of the invention as defined in the appended claims without departing from the spirit of the invention.
Claims (4)
1. A full-water-blocking rat-proof and termite-proof medium-voltage cable is characterized in that: the novel high-voltage power supply comprises a conductor (1), a conductor shielding layer (3) sleeved outside the conductor (1), a polypropylene insulating layer (4) arranged outside the conductor shielding layer (3), a groove insulating shielding layer (5) arranged outside the polypropylene insulating layer (4), an aluminum-plastic composite belt (7) arranged outside the groove insulating shielding layer (5), a polyethylene sheath (8) arranged on the outer layer of the aluminum-plastic composite belt (7) and a nylon protective layer (9) arranged on the outer layer of the polyethylene sheath (8);
wherein, the gap between the conductor shielding layer (3) and the conductor (1) is filled with water-blocking glue (2);
wherein the peripheral wall of the groove insulating shielding layer (5) is uniformly provided with a circumference of groove, and the groove is filled with semiconductor resistor water powder (6).
2. The full water-blocking rat-proof and termite-proof medium voltage cable of claim 1 wherein: the conductor (1) is formed by layering and twisting a plurality of conductor monofilaments.
3. The full water-blocking rat-proof and termite-proof medium voltage cable of claim 1 wherein: the conductor shielding layer (3) is a semiconductor shielding layer;
Or/and the semiconductor semi-conductive shielding layer is made of extrudable semi-conductive material;
or/and the semiconductor semi-conductive shielding layer is a wrapping semi-conductive tape and an extrusion semi-conductive layer.
4. The full water-blocking rat-proof and termite-proof medium voltage cable of claim 1 wherein: filling semiconductor resistor water powder (6) in the grooves of the groove insulating shielding layer (5); and the outside of the groove is longitudinally covered by an aluminum-plastic composite belt (7) to prevent the leakage of the semi-conductive resistor water powder (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410415387.0A CN118197693A (en) | 2024-04-08 | 2024-04-08 | Full-water-blocking rat-proof and termite-proof medium-voltage cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410415387.0A CN118197693A (en) | 2024-04-08 | 2024-04-08 | Full-water-blocking rat-proof and termite-proof medium-voltage cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118197693A true CN118197693A (en) | 2024-06-14 |
Family
ID=91404984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410415387.0A Pending CN118197693A (en) | 2024-04-08 | 2024-04-08 | Full-water-blocking rat-proof and termite-proof medium-voltage cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118197693A (en) |
-
2024
- 2024-04-08 CN CN202410415387.0A patent/CN118197693A/en active Pending
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