CN214377750U - Low-loss alternating-current land cable - Google Patents
Low-loss alternating-current land cable Download PDFInfo
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- CN214377750U CN214377750U CN202120680947.7U CN202120680947U CN214377750U CN 214377750 U CN214377750 U CN 214377750U CN 202120680947 U CN202120680947 U CN 202120680947U CN 214377750 U CN214377750 U CN 214377750U
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Abstract
The utility model discloses a low-loss alternating-current land cable, which comprises a water-blocking conductor, a semi-conductive belt, an inner shielding layer, an insulating layer, an outer shielding layer, a semi-conductive water-blocking belt, a metal sheath, a water-blocking buffer layer, an outer sheath and an extrusion molding semi-conductive layer, wherein the metal sheath adopts a composite metal shielding structure; the composite metal shielding structure comprises a buffer layer, a copper wire layer and a water-blocking protective tape, wherein the copper wire layer is wrapped on the outer wall of the semi-conductive water-blocking tape, the buffer layer is located between the copper wire layer and the semi-conductive water-blocking tape, and the water-blocking protective tape is wrapped on the outer wall of the copper wire layer. In this way, the utility model relates to a low-loss alternating current land cable, metal sheath in this cable adopt composite metal shielding structure, can reduce the cable external diameter, reduce the cable loss simultaneously, are convenient for actually lay.
Description
Technical Field
The utility model relates to a power cable field, concretely relates to low-loss alternating current land cable.
Background
With the rapid development of wind power and hydroelectric power energy, the demand of high-voltage cables is getting larger and larger, the transmission capacity of the cables is also getting larger and larger, and the cable technology is continuously updated to meet the continuously and rapidly increasing energy demand and the clean and efficient utilization of energy.
The traditional high-voltage power cable often uses wrinkle aluminium sheath, for example application number 201920221993.3 discloses a novel compound high-voltage land cable of photoelectricity, including separating strand piece, around the covering, conductor shield, the insulating layer, the insulating shield, the layer of the tape that blocks water, metal sheath, a plurality of photoelectric element, oversheath and semi-conducting layer, wherein metal sheath adopts wrinkle aluminium sheath, short-circuit current is very big when the short-circuit fault takes place for the cable, in order to satisfy technical requirement, the sectional area of wrinkle aluminium sheath must increase, just can maintain short-circuit current and flow through, this external diameter that will increase the cable, be unfavorable for actually laying.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a low-loss alternating current land cable, can reduce the cable external diameter.
In order to solve the technical problem, the utility model discloses a technical scheme be: a low-loss alternating-current terrestrial cable comprises a water-blocking conductor, a semi-conducting belt, an inner shielding layer, an insulating layer, an outer shielding layer, a semi-conducting water-blocking belt, a metal sheath, a water-blocking buffer layer, an outer sheath and extruded semi-conductors, wherein the metal sheath adopts a composite metal shielding structure;
the composite metal shielding structure comprises a buffer layer, a copper wire layer and a water-blocking protective tape, wherein the copper wire layer is wrapped on the outer wall of the semi-conductive water-blocking tape, the buffer layer is located between the copper wire layer and the semi-conductive water-blocking tape, and the water-blocking protective tape is wrapped on the outer wall of the copper wire layer.
In a preferred embodiment of the present invention, the copper wire layer is formed by a plurality of monofilaments.
In a preferred embodiment of the present invention, the monofilament includes a copper wire, an enameled wire and a space-continuous copper wire and enameled wire.
In a preferred embodiment of the present invention, the single wire is spaced from the copper wire and the enameled wire in the same cross section.
In a preferred embodiment of the present invention, the water-blocking protective tape includes a copper tape and an aluminum-plastic composite tape.
In a preferred embodiment of the present invention, the aluminum-plastic composite belt is wrapped around the outer wall of the copper belt.
In a preferred embodiment of the present invention, the buffer layer is a non-woven fabric.
The beneficial effects of utility model are that: the utility model relates to a low-loss alternating current land cable, the metal sheath in this cable adopts composite metal shielding structure, can reduce the cable external diameter, reduces the cable loss simultaneously, is convenient for actually lay.
Drawings
Fig. 1 is a schematic cross-sectional view of a low loss ac land cable.
Fig. 2 is a schematic view showing the spacing between the copper wire and the enameled wire in example 1.
Fig. 3 is a schematic view of the connection of the copper wire and the enameled wire in example 2.
The parts in the drawings are numbered as follows: 1. a water blocking conductor; 2. a semiconducting tape; 3. an inner shield layer; 4. an insulating layer; 5. an outer shield layer; 6. a semiconductive water-blocking tape; 7. non-woven fabric, 8, copper wire; 9. enamelled wires; 10. a water-blocking protective layer; 11. a water-blocking buffer layer; 12. an outer sheath; 13. extrusion is semi-conductive.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
Referring to fig. 1 to 3 of the drawings,
example 1
A low-loss alternating-current land cable comprises a water-blocking conductor 1, a semi-conductive belt 2, an inner shielding layer 3, an insulating layer 4, an outer shielding layer 5, a semi-conductive water-blocking belt 6, a metal sheath, a water-blocking buffer layer 11, an outer sheath 12 and an extrusion molding semi-conductive layer 13, wherein the metal sheath adopts a composite metal shielding structure, so that the outer diameter of the cable is reduced, the loss of the cable is reduced, and actual laying is facilitated.
The water blocking conductor 1 plays a role in transmitting current, the section of the conductor can be designed according to the transmission capacity of the cable, and a round monofilament compact conductor or a special compact conductor can be adopted.
The outer winding of conductor 1 that blocks water is two-layer the semi-conductive belt 2, semi-conductive belt 2 improves the smoothness on 1 sinle silk surface of conductor that blocks water, prevents that copper wire 8 has the burr to produce point discharge, the homogenization the conductor 1 that blocks water with the electric field effect of inner shield layer 3 department, crowd with through the three-layer altogether will inner shield layer 3 insulating layer 4 with the extrusion molding of outer shield layer 5 is in outside semi-conductive belt 2, inner shield layer 3 can homogenize the electric field that conductor 1 produced blocks water, outer shield layer 5 can homogenize insulating layer 4 side part surface electric field, inner shield layer 3 with outer shield layer 5 all adopts super smooth performance, high electric conductivity and thermosetting semi-conductive material to make, insulating layer 4 adopts crosslinked polyethylene to make, bears cable operating voltage effect, completely cuts off the voltage that conductor 1 that blocks water has, ensuring that the transmitted current only travels along the water blocking conductor 1 and does not flow to the outside.
Two layers of the semi-conductive water-blocking tape 6 are wound outside the outer shielding layer 5, and the semi-conductive water-blocking tape 6 plays roles in buffering, water blocking and electric field homogenization.
The composite metal shielding structure comprises a buffer layer, a copper wire layer and a water-blocking protective tape 10, wherein the copper wire layer is wrapped on the outer wall of the semi-conductive water-blocking tape 6, the buffer layer is located between the copper wire layer and the semi-conductive water-blocking tape 6, and the water-blocking protective tape 10 is wrapped on the outer wall of the copper wire layer.
The buffer layer is made of non-woven fabrics 7, multiple layers of non-woven fabrics 7 are wound outside the semi-conductive water-blocking tape 6, the buffer effect is achieved, meanwhile, the enameled wires 9 and the copper wires 8 are prevented from being pressed to damage the outer shielding layer 5, the enameled wires 9 and the copper wires 8 are wound outside the non-woven fabrics 7 at intervals and are embedded in the non-woven fabrics 7, and the non-woven fabrics 7 separate the enameled wires 9 from the copper wires 8.
The water blocking protective belt 10 comprises a copper belt and an aluminum-plastic composite belt, and the aluminum-plastic composite belt wraps the outer wall of the copper belt.
Adopt the copper wire layer the copper strips with the plastic-aluminum composite tape structure, because the resistivity of copper wire 8 is little, can have the reduction compound metal shielding structure thickness, and then reduce the land cable external diameter, make things convenient for the land cable to lay.
The non-woven fabric 7 is respectively wound with the copper strip and the aluminum-plastic composite strip, under normal conditions, capacitance current flows, when a cable is in short circuit, the current transmission effect is achieved, the copper strip is wrapped outside the enameled wire 9 and the copper wire 8 and has the functions of pressing, shielding and buffering, the aluminum-plastic composite strip is wrapped outside the copper strip and presses the copper strip, the water blocking and protecting effects are achieved,
the water-blocking buffer layer 11 is wound outside the aluminum-plastic composite belt to prevent high-temperature damage to the aluminum-plastic composite belt, the outer sheath 12 and the extrusion molding semi-conductive layer 13 are then co-extruded in a double-layer mode, the outer sheath 12 is made of a high-flame-retardant thermoplastic cable material, the cable is protected from being damaged by mechanical damage or various environments such as water, sunlight, organisms, fire disasters and the like in the laying and running processes, the long-term stable electrical performance of the cable is guaranteed, the extrusion molding semi-conductive layer 13 can homogenize an electric field, and the voltage-resisting degree of the cable is improved.
The copper wire layer is formed by surrounding a plurality of monofilaments, the types of the monofilaments comprise a copper wire 8, an enameled wire 9 and a copper wire 8 and an enameled wire 9 which are connected at intervals, and the monofilaments are arranged at intervals of the copper wire 8 and the enameled wire 9 in the same cross section.
The enameled wire 9 is formed by plating a layer of insulating paint on the surface of the copper wire 8, the size of a metal shielding induction voltage and the breakdown level of the insulating paint of the enameled wire 9 are considered, when the metal shielding induction voltage of the whole cable is smaller than the breakdown level of the insulating paint of the enameled wire 9, the enameled wire 9 is adopted to be connected with the enameled wire 9, and the copper wire 8 is connected with the copper wire 8, so that the circulating loss between the copper wire 8 and the copper strap can be reduced, and the current-carrying capacity of the land cable is further improved.
Example 2
A low-loss alternating-current land cable comprises a water-blocking conductor 1, a semi-conductive belt 2, an inner shielding layer 3, an insulating layer 4, an outer shielding layer 5, a semi-conductive water-blocking belt 6, a metal sheath, a water-blocking buffer layer 11, an outer sheath 12 and an extrusion molding semi-conductive layer 13, wherein the metal sheath adopts a composite metal shielding structure, so that the outer diameter of the cable is reduced, the loss of the cable is reduced, and actual laying is facilitated.
The water blocking conductor 1 plays a role in transmitting current, the section of the conductor can be designed according to the transmission capacity of the cable, and a round monofilament compact conductor or a special compact conductor can be adopted.
The outer winding of conductor 1 that blocks water is two-layer the semi-conductive belt 2, semi-conductive belt 2 improves the smoothness on 1 sinle silk surface of conductor that blocks water, prevents that copper wire 8 has the burr to produce point discharge, the homogenization the conductor 1 that blocks water with the electric field effect of inner shield layer 3 department, crowd with through the three-layer altogether will inner shield layer 3 insulating layer 4 with the extrusion molding of outer shield layer 5 is in outside semi-conductive belt 2, inner shield layer 3 can homogenize the electric field that conductor 1 produced blocks water, outer shield layer 5 can homogenize insulating layer 4 side part surface electric field, inner shield layer 3 with outer shield layer 5 all adopts super smooth performance, high electric conductivity and thermosetting semi-conductive material to make, insulating layer 4 adopts crosslinked polyethylene to make, bears cable operating voltage effect, completely cuts off the voltage that conductor 1 that blocks water has, ensuring that the transmitted current only travels along the water blocking conductor 1 and does not flow to the outside.
Two layers of the semi-conductive water-blocking tape 6 are wound outside the outer shielding layer 5, and the semi-conductive water-blocking tape 6 plays roles in buffering, water blocking and electric field homogenization.
The composite metal shielding structure comprises a buffer layer, a copper wire layer and a water-blocking protective tape 10, wherein the copper wire layer is wrapped on the outer wall of the semi-conductive water-blocking tape 6, the buffer layer is located between the copper wire layer and the semi-conductive water-blocking tape 6, and the water-blocking protective tape 10 is wrapped on the outer wall of the copper wire layer.
The buffer layer is made of non-woven fabrics 7, multiple layers of non-woven fabrics 7 are wound outside the semi-conductive water-blocking tape 6, the buffer effect is achieved, meanwhile, the enameled wires 9 and the copper wires 8 are prevented from being pressed to damage the outer shielding layer 5, the enameled wires 9 and the copper wires 8 are wound outside the non-woven fabrics 7 at intervals and are embedded in the non-woven fabrics 7, and the non-woven fabrics 7 separate the enameled wires 9 from the copper wires 8.
The water blocking protective belt 10 comprises a copper belt and an aluminum-plastic composite belt, and the aluminum-plastic composite belt wraps the outer wall of the copper belt.
Adopt the copper wire layer the copper strips with the plastic-aluminum composite tape structure, because the resistivity of copper wire 8 is little, can have the reduction compound metal shielding structure thickness, and then reduce the land cable external diameter, make things convenient for the land cable to lay.
The non-woven fabric 7 is respectively wound with the copper strip and the aluminum-plastic composite strip, under normal conditions, capacitance current flows, when a cable is in short circuit, the current transmission effect is achieved, the copper strip is wrapped outside the enameled wire 9 and the copper wire 8 and has the functions of pressing, shielding and buffering, the aluminum-plastic composite strip is wrapped outside the copper strip and presses the copper strip, the water blocking and protecting effects are achieved,
the water-blocking buffer layer 11 is wound outside the aluminum-plastic composite belt to prevent high-temperature damage to the aluminum-plastic composite belt, the outer sheath 12 and the extrusion molding semi-conductive layer 13 are then co-extruded in a double-layer mode, the outer sheath 12 is made of a high-flame-retardant thermoplastic cable material, the cable is protected from being damaged by mechanical damage or various environments such as water, sunlight, organisms, fire disasters and the like in the laying and running processes, the long-term stable electrical performance of the cable is guaranteed, the extrusion molding semi-conductive layer 13 can homogenize an electric field, and the voltage-resisting degree of the cable is improved.
The copper wire layer is formed by surrounding a plurality of monofilaments, the types of the monofilaments comprise a copper wire 8, an enameled wire 9 and a copper wire 8 and an enameled wire 9 which are connected at intervals, and the monofilaments are arranged at intervals of the copper wire 8 and the enameled wire 9 in the same cross section.
The enameled wire 9 is formed by plating a layer of insulating paint on the surface of the copper wire 8, considering the size of a metal shielding induction voltage and the breakdown level of the insulating paint of the enameled wire 9, when the metal shielding induction voltage of the whole cable is larger than the breakdown level of the insulating paint of the enameled wire 9, the enameled wire 9 is adopted to connect the copper wire 8, and the copper wire 8 is connected with the enameled wire 9, so that the potential difference between the copper wire 8 and the copper strip can be reduced, the voltage of the enameled wire 9 is prevented from being too high, and the paint of the enameled wire 9 is prevented from being broken down on the surface.
Compared with the prior art, the utility model relates to a low-loss alternating current land cable, metal sheath in this cable adopt composite metal shielding structure, can reduce the cable external diameter, reduce the cable loss simultaneously, are convenient for actually lay.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (7)
1. A low-loss alternating-current terrestrial cable comprises a water-blocking conductor, a semi-conductive belt, an inner shielding layer, an insulating layer, an outer shielding layer, a semi-conductive water-blocking belt, a metal sheath, a water-blocking buffer layer, an outer sheath and extruded semi-conductors, and is characterized in that the metal sheath adopts a composite metal shielding structure;
the composite metal shielding structure comprises a buffer layer, a copper wire layer and a water-blocking protective tape, wherein the copper wire layer is wrapped on the outer wall of the semi-conductive water-blocking tape, the buffer layer is located between the copper wire layer and the semi-conductive water-blocking tape, and the water-blocking protective tape is wrapped on the outer wall of the copper wire layer.
2. A low loss alternating current terrestrial cable according to claim 1 wherein: the copper wire layer is formed by a plurality of monofilaments in a surrounding mode.
3. A low loss alternating current terrestrial cable according to claim 2 wherein: the monofilament type comprises a copper wire, an enameled wire and a copper wire and the enameled wire which are connected at intervals.
4. A low loss alternating current terrestrial cable according to claim 3 wherein: the monofilaments in the same section are arranged at intervals by adopting the copper wires and the enameled wires.
5. A low loss alternating current terrestrial cable according to claim 1 wherein: the water-blocking protective belt comprises a copper belt and an aluminum-plastic composite belt.
6. A low loss alternating current terrestrial cable according to claim 5 wherein: the aluminum-plastic composite belt wraps the outer wall of the copper belt.
7. A low loss alternating current terrestrial cable according to claim 1 wherein: the buffer layer is non-woven fabrics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120680947.7U CN214377750U (en) | 2021-04-02 | 2021-04-02 | Low-loss alternating-current land cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120680947.7U CN214377750U (en) | 2021-04-02 | 2021-04-02 | Low-loss alternating-current land cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214377750U true CN214377750U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120680947.7U Active CN214377750U (en) | 2021-04-02 | 2021-04-02 | Low-loss alternating-current land cable |
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| CN (1) | CN214377750U (en) |
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- 2021-04-02 CN CN202120680947.7U patent/CN214377750U/en active Active
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