CN214671921U - Cross-linked polyethylene insulated direct-current cable for urban light rail subway - Google Patents
Cross-linked polyethylene insulated direct-current cable for urban light rail subway Download PDFInfo
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- CN214671921U CN214671921U CN202121282148.0U CN202121282148U CN214671921U CN 214671921 U CN214671921 U CN 214671921U CN 202121282148 U CN202121282148 U CN 202121282148U CN 214671921 U CN214671921 U CN 214671921U
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- light rail
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- current cable
- linked polyethylene
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Abstract
The utility model discloses a crosslinked polyethylene insulation city direct current cable for light rail subway relates to cable technical field, the package rubbing core body, the core outside from interior to outer in proper order the cladding have crosslinked polyethylene insulating layer, water blocking layer, insulating layer, comprehensive protection layer and oversheath, water blocking layer outer circumference side circumference array is equipped with many copper lines, the quantity of copper line is 2 multiples, the copper line embedding is in the insulating layer, two arbitrary random combination in the copper line pass through the fuse connection, along a plurality of fuses of core axial evenly distributed, when carrying out the cable conductor maintenance, carry out the short circuit with the copper line of the combination of cable conductor one end or carry out resistance test through the universal meter, calculate the cracked position of cable conductor through resistance value testing result, and then realize accurate location, improved the efficiency of maintenance, shorten the time of maintenance.
Description
Technical Field
The utility model belongs to the technical field of the cable, concretely relates to direct current cable is used to crosslinked polyethylene insulation city light rail subway.
Background
The direct current cable is a power cable used in a direct current transmission and distribution system. The dc cable is substantially identical in construction to the ac cable except that it operates with electrical characteristics different from those of the ac cable. The dc transmission and distribution system is usually operated in two lines (positive and negative), so the dc cable is generally a single-core cable. Along with the development of present urbanization, for the convenience of people's trip, the subway has obtained extensive construction in the city, need use a large amount of cables in the subway construction process, and subway cable's service environment is mostly the underground of population density, when meeting with natural disasters and natural factors such as geological settlement, the cable conductor can lead to the fracture damage, thereby influence normal use, do not have supplementary positioning mechanism during current cable maintenance, consequently need consume a large amount of time and energy during the maintenance, prosthetic efficiency has been influenced, therefore, we provide a crosslinked polyethylene dc cable for light rail subway in city.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model aims to provide an insulating city of crosslinked polyethylene direct current cable for light rail subway to solve the problem that provides among the above-mentioned background art.
The purpose of the utility model can be realized by the following technical scheme: the utility model provides an insulating city light rail of crosslinked polyethylene direct current cable for subway, includes the core, the core outside has wrapped up in crosslinked polyethylene insulating layer, water blocking layer, insulating layer, comprehensive inoxidizing coating and oversheath from interior to exterior in proper order, water blocking layer outer circumference side circumference array is equipped with many copper lines, the quantity of copper line is 2 multiples, the copper line embedding is in the insulating layer, two arbitrary random combinations in the copper line pass through the fuse and connect, along a plurality of fuses of core axial evenly distributed.
As a further scheme of the utility model, it is adjacent distance is between 80 ~ 100m between the fuse.
As a further scheme of the utility model, the fuse outside is equipped with annular cassette, the fuse is accomodate in annular cassette, annular cassette is two sets of semicircle snap ring tip block of detachable and constitutes.
As a further aspect of the present invention, the fuse is adapted to be self-resetting.
As a further proposal of the utility model, the comprehensive protective layer is any one of a stainless steel-plastic composite belt or an aluminum-plastic composite belt.
As a further proposal of the utility model, the outer sheath is a low-smoke halogen-free polyolefin sheath.
The utility model has the advantages that: the crosslinked polyethylene insulating layer has high hardness, good toughness, difficult abrasion and extremely excellent tearing resistance;
when carrying out the cable conductor and overhauing, carry out the short circuit with the copper line of the combination of cable conductor one end or carry out resistance test through the universal meter, calculate out the cracked position of cable conductor through resistance value testing result, and then realize accurate location, improved the efficiency of overhauing, shorten the time of maintenance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention;
in the figure: core-1, crosslinked polyethylene insulating layer-2, water-resisting layer-3, copper wire-4, fuse-5, annular clamping seat-6, insulating layer-7, comprehensive protective layer-8 and outer sheath-9
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 of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a cross-linked polyethylene insulated dc cable for urban light rail subways includes a core 1, a cross-linked polyethylene insulating layer 2, a water blocking layer 3, an insulating layer 7, a comprehensive protective layer 8, and an outer sheath 9 are sequentially wrapped on an outer side of the core 1 from inside to outside, a plurality of copper wires 4 are circumferentially arrayed on an outer circumferential side of the water blocking layer 3, the number of the copper wires 4 is multiple of 2, the copper wires 4 are embedded in the insulating layer 7, any two random combinations of the copper wires 4 are connected by a fuse 5, the fuses 5 are uniformly distributed along an axial direction of the core 1, when a cable is broken due to geological disasters and land subsidence, when the cable is overhauled, the cross-linked polyethylene insulating layer 2 of the combination at one end of the cable is short-circuited or resistance test is performed by a multimeter, and the broken part of the cable is calculated according to a resistance value detection result, and then realize accurate location, improved the efficiency of overhauing, shorten the time of maintenance, it is adjacent the distance is between 80 ~ 100m between the fuse 5, and the too big degree of difficulty that can increase the location apart from, the undersize can influence the holistic intensity of cable conductor.
In some embodiments, the outside of fuse 5 is equipped with annular cassette 6, and fuse 5 is accomodate in annular cassette 6, and annular cassette 6 is two sets of semicircle snap ring tip block constitutions of detachable, and annular cassette 6 plays and carries out the guard action to fuse 5, overhauls the back simultaneously and is convenient for change the fuse 5 of damage, and annular cassette 6 position is marked outside outer sheath 9, is convenient for seek.
In some embodiments, the fuse 5 is one of a self-resetting fuse or a normal fuse, and the self-resetting fuse is most preferably used because the normal fuse needs to be replaced after being blown. The self-resetting fuse uses metallic sodium as a melt, and has high conductivity at normal temperature. When the short-circuit fault occurs in the circuit, the short-circuit current generates high temperature to quickly vaporize sodium, and the vaporous sodium presents a high resistance state, so that the short-circuit current is limited. When the short-circuit current disappears, the temperature drops, and the metal sodium recovers the original good conductive performance. The self-resetting fuse can only limit short-circuit current and cannot really break the circuit. The fuse protector has the advantages that a fuse body does not need to be replaced, the fuse protector can be repeatedly used, after the crosslinked polyethylene insulating layer 2 is subjected to short circuit, the self-resetting fuse protector is sequentially disconnected due to high temperature generated by short circuit current, and the fuse protector 5 at the broken position of the cable is broken, so that the resistance detection value is abnormal, the state of the fuse protector is monitored, and the position of the fuse protector which is not fused is determined to be close to the broken position.
Preferably, the comprehensive protective layer 8 is any one of a stainless steel-plastic composite tape or an aluminum-plastic composite tape. Has good water and rat resistance and good flame retardance.
Preferably, the outer sheath 9 is a low-smoke halogen-free polyolefin sheath, can effectively prevent termite bite, has good weather resistance,
in the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed or operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the method is simple. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention. Therefore, the present invention should be considered as illustrative and not restrictive in any sense, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and the preferred embodiments of the present invention are not intended to be limiting of the invention, and all changes, equivalents, modifications, etc. that come within the spirit and scope of the invention are intended to be embraced therein.
Claims (6)
1. The utility model provides a cross-linked polyethylene insulation city light rail direct current cable for subway, includes core (1), its characterized in that, core (1) outside from interior to outer in proper order has been wrapped up in cross-linked polyethylene insulating layer (2), water blocking layer (3), insulating layer (7), comprehensive inoxidizing coating (8) and oversheath (9), the circumference side circumference array of water blocking layer (3) is equipped with many copper lines (4), the quantity of copper line (4) is 2's multiple, copper line (4) embedding is in insulating layer (7), two arbitrary random combination in copper line (4) pass through fuse (5) and connect, along a plurality of fuses (5) of core (1) axial evenly distributed.
2. The cross-linked polyethylene insulated city light rail direct current cable for subway according to claim 1, characterized in that the distance between adjacent fuses (5) is between 80-100 m.
3. The direct current cable for the metro of the urban light rail insulated by the crosslinked polyethylene according to claim 1, wherein an annular clamping seat (6) is arranged on the outer side of the fuse (5), the fuse (5) is contained in the annular clamping seat (6), and the annular clamping seat (6) is formed by clamping the end parts of two detachable groups of semicircular clamping rings.
4. The cross-linked polyethylene insulated city light rail direct current cable for subway according to claim 3, characterized in that said fuse (5) is a self-resetting fuse.
5. The cross-linked polyethylene insulated city light rail direct current cable for subway according to claim 1, characterized in that said comprehensive protective layer (8) is any one of stainless steel plastic composite tape or aluminum plastic composite tape.
6. The cross-linked polyethylene insulated city light rail direct current cable for subway according to claim 1, characterized in that said outer sheath (9) is a low smoke zero halogen polyolefin sheath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121282148.0U CN214671921U (en) | 2021-06-08 | 2021-06-08 | Cross-linked polyethylene insulated direct-current cable for urban light rail subway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121282148.0U CN214671921U (en) | 2021-06-08 | 2021-06-08 | Cross-linked polyethylene insulated direct-current cable for urban light rail subway |
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| CN214671921U true CN214671921U (en) | 2021-11-09 |
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| CN202121282148.0U Active CN214671921U (en) | 2021-06-08 | 2021-06-08 | Cross-linked polyethylene insulated direct-current cable for urban light rail subway |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114242305A (en) * | 2021-12-22 | 2022-03-25 | 江苏景昇新材料有限公司 | Bending-resistant silver-plated alloy copper wire |
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2021
- 2021-06-08 CN CN202121282148.0U patent/CN214671921U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114242305A (en) * | 2021-12-22 | 2022-03-25 | 江苏景昇新材料有限公司 | Bending-resistant silver-plated alloy copper wire |
| CN114242305B (en) * | 2021-12-22 | 2023-12-29 | 江苏昇达线缆有限公司 | Bending-resistant silver-plated alloy copper wire |
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