CN216388863U - Medium-high voltage power cable - Google Patents
Medium-high voltage power cable Download PDFInfo
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- CN216388863U CN216388863U CN202123102430.9U CN202123102430U CN216388863U CN 216388863 U CN216388863 U CN 216388863U CN 202123102430 U CN202123102430 U CN 202123102430U CN 216388863 U CN216388863 U CN 216388863U
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Abstract
The utility model relates to the technical field of wires and cables, and particularly provides a medium-high voltage power cable which comprises: the three cable guide cores which are tangent in pairs are wrapped by a wrapping layer to form a conductor core with a circular section; the filling layer is filled between the cable guide core and the wrapping layer; the inner protection layer, the armor layer and the outer sheath are sequentially arranged on the outer side of the conductor core; the cross section of each conductive single wire is in a geometric shape which can be mutually seamlessly spliced into a circle, the conductive single wires are mutually embedded and connected when being twisted to form a firm and firm twisted conductor, the tip discharge phenomenon cannot be generated when the conductive single wires are used in a medium-high voltage cable, the pressing procedures are reduced, the production efficiency of the twisted wires is improved, the metal processing hardening phenomenon cannot occur, the single wires still basically keep the characteristics before twisting, and the cable has the characteristics of high insulation high concentricity, low release amount and the like.
Description
Technical Field
The utility model relates to the technical field of wires and cables, in particular to a medium-high voltage power cable.
Background
The insulation eccentricity is an important index of a medium-high voltage cable, and is usually difficult to control, if the control level of the insulation eccentricity is not high enough, the field intensity in the insulation of the cable is converged and distorted after the cable is used for a long time, and a place with thin insulation or a conductor burr is subjected to higher field intensity, so that the cable is damaged early, punctured, abraded, exposed and the like, and the safe operation and the service life of the cable are greatly influenced.
In the prior art, in order to save power cable materials, reduce the area of a gap, reduce the outer diameter of a conductor and save materials of an insulating layer and a coating layer, the conductor is generally pressed in a layered manner and is limited by a metal processing line, the pressing amount cannot be too large, and the filling coefficient is generally below 0.9; secondly, after the conductor is compacted, the strength of the conductor is increased, the conductivity is reduced, the bending performance is poor, the embedding of the inner shielding layer of the conductor can directly influence the eccentricity abnormity of the insulating layer, the diameter of the conductor monofilament is unstable, the annealing degree of the conductor monofilament is inconsistent, the compacting degree of the conductor is not high, the pitch is unreasonable, and after the conductor is twisted, the plastic deformation of individual monofilament is not thorough, and the rebound is caused, so that the rounding and fitting performance of the outer layer of the conductor is not enough.
Therefore, on the premise of not changing the conductive characteristic of the conductor, the gap between the conductor single lines is reduced, the concentricity of the cable can be improved, the outer diameter of the conductor is reduced, the cost of the cable is saved, and the bending performance of the cable is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a medium-high voltage power cable, which comprises:
seven tangent lapped layers are wrapped in pairs to form conductor cores with circular sections;
the filling layer is filled between the cable guide core and the wrapping layer; and
the inner protection layer, the armor layer and the outer sheath are sequentially arranged on the outer side of the conductor core;
wherein, the cable is led the core and is included heart yearn, conductor unit and set gradually internal shield layer, insulating layer, external shield layer and the total shielding layer in the conductor unit outside:
a core wire disposed at an axial center position of the cable;
the conductive single wires are wrapped on the outer side of the core wire in multiple layers to form a conductor unit with a circular section, the conductive single wires on each layer are mutually twisted, and the cross sections of the conductive single wires can be mutually and seamlessly spliced to form a geometric shape close to the circular shape.
Preferably, the conductive single wire comprises a single wire main body and clamping and embedding parts arranged on two sides of the single wire main body, and the cross-sectional shapes of the clamping and embedding parts on the left side and the right side of the adjacent two single wire main bodies are complementary.
Preferably, the clamping portion is one of a rectangular clamping portion, an arc-shaped clamping portion or a tooth-shaped clamping portion.
Preferably, the conductive single wires are twisted outside the core wire in a centrosymmetric manner.
Preferably, the conductive single wires are arranged in three layers and sequentially twisted on the outer side of the core wire from inside to outside, so that the filling factor of the conductor unit is 0.97.
Preferably, the inner sheath layer and the outer sheath layer are both made of silicon rubber or flame-retardant polyethylene materials.
Preferably, the inner shielding layer, the insulating layer and the outer shielding layer are formed by three-layer co-extrusion, the inner shielding layer and the outer shielding layer are extruded by a semiconductor shielding material, and the insulating layer is extruded by sampling polyethylene.
Preferably, the total shielding layer is formed by winding a thin copper strip.
Compared with the prior art, the utility model has the advantages that:
the utility model has a plurality of conductive single wires which are wrapped around a core wire in a plurality of layers and are twisted together in a rotating way, the cross section of each conductive single wire is in a geometric shape which is close to or almost circular by mutual seamless splicing, the conductive single wires are mutually embedded and connected when being twisted to form a firm and firm twisted conductor, the utility model can not generate point discharge phenomenon when being used in a medium-high voltage cable, reduces the pressing process, improves the production efficiency of the twisted wire, can not generate metal processing hardening phenomenon, and the single wires still basically keep the characteristic before twisting, has better conductive performance than the pressed conductor under the same cross section, has good bending performance, has the characteristics of higher insulation high concentricity, lower partial discharge quantity and the like, can obviously improve the safety and reliability of an electric system, and can prolong the service life of the cable.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the inventive subject matter of this disclosure.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of a cut surface of a medium-high voltage power cable according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a cable core cutting plane in a medium-high voltage power cable according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a distribution structure of core wires and conductive single wires in a medium-high voltage power cable according to an embodiment of the present invention;
fig. 4a is a schematic structural diagram of a snap-fit unit in a medium-high voltage power cable according to an embodiment of the present invention;
fig. 4b is another schematic structural diagram of the engaging unit in the medium-high voltage power cable according to the embodiment of the present invention;
fig. 4c is a schematic view of another structure of the engaging unit in the medium-high voltage power cable according to the embodiment of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the utility model. It should be understood that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways with any medium-high voltage power cable, as the disclosed concepts and embodiments of the utility model are not limited to any implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
The common medium-high voltage cable is often caused by the fact that insulation is easy to break down and the service life is short due to core deviation in the using process, and large direct and indirect losses are caused. Therefore, it is highly desirable to develop a medium-high voltage cable of a type conductor, which is easy to improve the conductor roundness and avoid the undesirable defects such as burrs, etc., so as to reduce the gaps between conductor single wires, reduce the conductor outer diameter, save the cable cost, and improve the bending performance of the cable without changing the conductive characteristics of the conductor itself.
The medium-high voltage power cable according to the embodiment of the utility model shown in fig. 1 has the characteristics of small eccentricity, low local discharge and the like, and the eccentricity is controlled to be less than 5%.
In a preferred embodiment, every two of the three cable guide cores 1 are tangent, a conductor core with a circular cross section is formed by wrapping a wrapping layer 3, a filling layer 2 is filled between the cable guide cores 1 and the wrapping layer 3, and an inner protection layer 4, an armor layer 5 and an outer protection layer 6 are sequentially arranged on the outer side of the wrapping layer 3.
Specifically, the filling layer 2 is made of halogen-free or low-halogen flame-retardant filling ropes.
The wrapping layer 3 adopts polyester wrapping tape, and the filling layer 2 and the cable guide core 1 are wrapped to form a circular section so that the cable is more round.
The inner protective layer 4 and the outer protective layer 6 are both made of silicon rubber or flame-retardant polyethylene materials.
The armor layer 5 is armored by thin steel wires and is used for enhancing the tensile strength, the compressive strength and other mechanical protection of the cable and prolonging the service life of the cable.
As shown in fig. 2, the cable core 1 includes a core wire 11 and a conductive element wire 12.
The core wire 11 is arranged at the axis position of the cable, the conductive single wires 12 are arranged into a plurality of pieces and wrapped on the outer side of the core wire 11 in multiple layers to form a conductor unit with a circular section.
In a preferred embodiment, the core wire 11 and the conductive element wires 12 are made of annealed copper wires, and the conductive element wires 12 are arranged in three layers and are sequentially twisted on the outer side of the core wire 11 from inside to outside, so that the filling factor of the conductor unit is 0.97.
Further, each layer of the conductive element wires 12 are twisted with each other, and the cross-sectional shape of the conductive element wires 12 is a geometric shape that can be seamlessly spliced with each other to form a big letter with a circular configuration, as shown in the figure, the basic outline shape is circular.
Therefore, under the same conductor section, the outer diameter of the conductor unit is reduced by 7-15% compared with that of a conventional round non-compacted conductor, the outer diameter of the conductor unit is reduced by 3% -6% compared with that of the compacted conductor, the insulation eccentricity is not more than 5%, the voltage is applied to 1.73Uo in a partial discharge test, and the partial discharge item of the cable is free of discharge, so that the insulating layer and the outer layer material are greatly saved. Meanwhile, the cable has the characteristics of high insulation, high concentricity, low partial discharge and the like, can obviously improve the safety and reliability of an electric system and prolong the service life of the cable, and cannot generate point discharge when being used in a medium-high voltage cable.
In a preferred embodiment, when the conductive element wires 12 are twisted outside the core wire 11, gaps between adjacent conductive element wires 12 are filled, the surface of each layer of conductive element wires 12 is rounded and has no gap, the conductive element wires 12 are twisted outside the core wire 11 in a central symmetry manner, the conductive element wires 12 include element wire main bodies 121 and clamping and embedding parts 122 arranged on both sides of the element wire main bodies 121, and the cross-sectional shapes of the clamping and embedding parts 122 on both sides of the adjacent element wire main bodies 121 are complementary.
Specifically, the cross-sectional area of the element wire body 121 accounts for more than half of the total cross-sectional area of the conductive element wire 12, and the engaging portions 122 on both sides are required to be complementary in cross-sectional shape.
In this way, when the conductive element wires 12 are twisted outside the core wire 11, the engaging portions 122 on both sides of the element wire body 121 engage with each other, and the gaps between the element wire bodies 121 can be filled in the circumferential direction, so that the outer surface of the hierarchical structure formed by the conductive element wires 12 is more rounded and seamless. In the radial direction, the mutually laminated and embedded clamping and embedding parts 122 can enable the stranded conductive single wires 12 to be more stable and not easy to loosen, so that the pressing process can be reduced, the production efficiency of the stranded wires is improved, the metal work hardening phenomenon can not occur, the single wires still basically keep the characteristics before twisting, the conductive performance is better than that of a pressed conductor under the same section, and the cable has good bending performance.
In order to make the adjacent conductive element wires 12 to fill the gap in the circumferential direction during the mutual twisting process and to be engaged with each other in the radial direction, in an alternative embodiment, the engaging portion 122 is a rectangular engaging portion 122a, wherein the rectangular engaging portion 122a is configured to be engaged with each other in the radial direction and has a geometrical cross section shape complementary in shape, such as a rectangular shape or a stepped shape.
In another embodiment, in order to make the conductive single wires 12 easier to splice and abut against each other when twisted, in an alternative embodiment, the clamping and embedding parts 122 are arc-shaped clamping and embedding parts 122b, wherein the arc-shaped clamping and embedding parts 122b are arranged to be more easily slid into and nested when two adjacent clamping and embedding parts 122 are close to each other, so that when the single wire bodies 121 are sequentially twisted, the arc-shaped clamping and embedding parts 122b are easy to abut against each other, and the twisting speed can be increased.
In another embodiment, in order to make the conductive element wires 12 more stable during twisting, not only the conductive element wires 12 between the single layers are more stable, but also the adjacent two layers of conductive element wires 12 can maintain stable structure, the clamping portion 122 is a tooth-shaped clamping portion 122c, the tooth-shaped clamping portion 122c adds tooth-shaped protrusions and corresponding tooth sockets on the basis of the rectangular clamping portion 122a, so that the tooth-shaped clamping portions 122c are more stable after being spliced, and the conductive element wires 12 of the same layer and the conductive element wires 12 of the adjacent layer are all in a stable structure clamped and fixed with each other.
As shown in fig. 2, the cable core 1 further includes an inner shield layer 13, an insulating layer 14, an outer shield layer 15, and a total shield layer 16, which are sequentially disposed outside the conductor unit.
Wherein, the inner shielding layer 13 and the outer shielding layer 15 can be extruded by semiconductor shielding material.
The insulating layer 14 may be made of polyethylene.
The inner shield layer 13, the insulating layer 14 and the outer shield layer 15 are formed by a three-layer co-extrusion machine head in a cross-linking machine.
The outer wall of the conductor formed by twisting the conductive single wires 12 is round and seamless, so that the melt of the inner shielding layer 13 cannot be extruded into the gap of the conductor, the phenomenon that the inner shield of the conductor is embedded is avoided, the whole cable guide core 1 is round, and after the three-layer co-extrusion is finished, a layer of copper strip is wrapped on the outer layer to serve as a total shielding layer 16, so that the electromagnetic interference shielding effect is achieved.
By combining the above embodiments, the utility model has a plurality of conductive single wires 12 which are wrapped around the core wire 11 in multiple layers and are twisted together in a rotating manner, the cross section of the conductive single wires 12 is in a geometric shape which can be spliced into a round shape seamlessly, the conductive single wires 12 are mutually embedded and connected when twisted to form a firm and firm twisted conductor, the utility model can not generate point discharge phenomenon when used in a medium-high voltage cable, reduces the pressing process, improves the production efficiency of the twisted wire, can not generate metal processing hardening phenomenon, and the single wires still basically keep the characteristics before twisting, has better conductive performance than the pressed conductor under the same cross section, has good bending performance, has the characteristics of higher insulation high concentricity, lower local discharge amount and the like, can obviously improve the safety and reliability of an electric system, and can prolong the service life of the cable.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (10)
1. A medium-high voltage power cable, comprising:
the three cable guide cores are wrapped with the wrapping layers which are tangent in pairs to form conductor cores with circular sections;
the filling layer is filled between the cable guide core and the wrapping layer; and
the inner protection layer, the armor layer and the outer sheath are sequentially arranged on the outer side of the conductor core;
wherein, the cable is led the core and is included heart yearn, conductor unit and set gradually internal shield layer, insulating layer, external shield layer and the total shielding layer in the conductor unit outside:
a core wire disposed at an axial center position of the cable;
the conductive single wires are wrapped on the outer side of the core wire in multiple layers to form a conductor unit with a circular section, the conductive single wires on each layer are mutually twisted, and the cross sections of the conductive single wires can be mutually and seamlessly spliced to form a geometric shape close to the circular shape.
2. The medium-high voltage power cable according to claim 1, wherein the conductive single wire comprises a single wire body and clamping and embedding parts arranged on two sides of the single wire body, and the cross-sectional shapes of the clamping and embedding parts on the left side and the right side of the adjacent two single wire bodies are complementary.
3. The medium-high voltage power cable according to claim 2, wherein the snap-in portion is a rectangular snap-in portion.
4. The medium-high voltage power cable according to claim 2, wherein the snap-in portion is an arc-shaped snap-in portion.
5. The medium-high voltage power cable according to claim 2, wherein the snap-in portion is a toothed snap-in portion.
6. The medium-high voltage power cable according to claim 1, wherein the conductive element wires are twisted outside the core wire in a centrosymmetric manner.
7. The medium-high voltage power cable according to any one of claims 1 to 6, wherein the conductive single wires are arranged in three layers and sequentially twisted on the outer side of the core wire from inside to outside so that the filling factor of the conductor unit is 0.97.
8. The medium-high voltage power cable according to claim 1, wherein the inner sheath and the outer sheath are made of silicone rubber or flame-retardant polyethylene material.
9. The medium-high voltage power cable according to claim 1, wherein the inner shielding layer, the insulating layer and the outer shielding layer are formed by three-layer co-extrusion, the inner shielding layer and the outer shielding layer are extruded by a semiconductor shielding material, and the insulating layer is extruded by sampling polyethylene.
10. The medium-high voltage power cable according to claim 1, wherein the total shielding layer is a shielding layer formed by wrapping a thin copper tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123102430.9U CN216388863U (en) | 2021-12-07 | 2021-12-07 | Medium-high voltage power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123102430.9U CN216388863U (en) | 2021-12-07 | 2021-12-07 | Medium-high voltage power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216388863U true CN216388863U (en) | 2022-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123102430.9U Active CN216388863U (en) | 2021-12-07 | 2021-12-07 | Medium-high voltage power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216388863U (en) |
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2021
- 2021-12-07 CN CN202123102430.9U patent/CN216388863U/en active Active
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