CN219842832U - 27.5kV bipolar self-shielding cable for electrified railway - Google Patents
27.5kV bipolar self-shielding cable for electrified railway Download PDFInfo
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- CN219842832U CN219842832U CN202320545225.XU CN202320545225U CN219842832U CN 219842832 U CN219842832 U CN 219842832U CN 202320545225 U CN202320545225 U CN 202320545225U CN 219842832 U CN219842832 U CN 219842832U
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- 239000004020 conductor Substances 0.000 claims abstract description 70
- 239000010410 layer Substances 0.000 claims description 63
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 37
- 229910052802 copper Inorganic materials 0.000 claims description 27
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- 229910052751 metal Inorganic materials 0.000 claims description 12
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- 238000004804 winding Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000002356 single layer Substances 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
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- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 abstract description 7
- 239000004703 cross-linked polyethylene Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 17
- 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 9
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Abstract
The utility model discloses a 27.5kV bipolar self-shielding cable for an electrified railway, which comprises the following components: the inner conductor, the inner conductor shielding layer, the insulating shielding layer, the outer conductor, the inner sheath, the armor layer, the wrapping tape and the outer sheath are sequentially sleeved from inside to outside. Compared with the traditional 27.5kV single-phase alternating-current crosslinked polyethylene insulated cable for the electrified railway, the 27.5kV bipolar self-shielding cable for the electrified railway has the advantages that: the product adopts a bipolar structural design, combines the original positive and negative cables into one, and realizes a concentric compact structural form of the positive and negative cables. The bipolar self-shielding cable structure for the electrified railway provided by the utility model can effectively weaken harmonic electromagnetic interference of the traditional single-core alternating-current cable on other cables around while self-attaching shielding, reduce the line loss of the cable and improve the current carrying capacity of the cable.
Description
Technical Field
The utility model relates to the technical field of wires and cables, in particular to a 27.5kV bipolar self-shielding cable for an electrified railway.
Background
In recent years, with the large-scale construction of high-speed electrified railways nationally, the problems of power grid pollution and power quality caused by nonlinear loads (harmonics) of the electrified railways are increasing. In particular, the cable can generate skin effect and proximity effect under the influence of harmonic wave, so that the cable line generates additional heat, and the service life of the cable is reduced. In addition, the harmonic wave can also cause the increase of cable loss and the reduction of current carrying capacity, seriously affecting the stability and safety of the power supply system.
The positive pole and the negative pole of the single-phase alternating current crosslinked polyethylene insulated cable of traditional electric railway 27.5kV are usually by two cables, in narrow and small electric railway laying environment, its great volume and weight can increase the laying degree of difficulty, and the harmonic that just, negative pole cable produced can produce electromagnetic interference to nearby communication cable, instrument cable and communications facilities, causes the misjudgement risk easily, causes the safety problem.
Disclosure of Invention
The utility model aims to solve the problems that harmonic waves generated by the positive electrode and the negative electrode of the existing cable in the background technology can cause electromagnetic interference to nearby communication cables, instrument cables, communication equipment and the like, so that misjudgment risks are caused, safety accidents are caused and the like, and provides a 27.5kV bipolar self-shielding cable for an electrified railway.
The utility model is realized by the following technical scheme:
27.5kV bipolar self-shielding cable for electrified railway, characterized in that the bipolar self-shielding cable comprises: the inner conductor, the inner conductor shielding layer, the insulating shielding layer, the outer conductor, the inner sheath, the armor layer, the wrapping tape and the outer sheath are sequentially sleeved from inside to outside.
Specifically, the 27.5kV bipolar self-shielding cable for the electrified railway is designed by the utility model, and compared with a traditional 27.5kV single-phase alternating-current crosslinked polyethylene insulated cable for the electrified railway: the product adopts a bipolar structural design, combines the original positive and negative cables into one, and realizes a concentric compact structural form of the positive and negative cables. The bipolar self-shielding cable structure designed by the utility model can effectively weaken the harmonic electromagnetic interference of the traditional single-core alternating-current cable to other cables around while self-attaching shielding, reduce the line loss of the cable and improve the current carrying capacity of the cable. In addition, the bipolar self-shielding cable has better protection capability on the wire core structure by the outer conductor (outer conductor), and the cable structure after the optimal design is more compact and stable, has better electrical and physical stability than the traditional cable, can meet the requirements of diversified electrified railway laying and operating environments by the organic combination of the outer conductor and the sheath material, and is a high-cost performance cable integrating the performances of stability, safety, economy, environmental protection, energy conservation and the like.
Further, 27.5kV bipolar self-shielding cable for electrified railway: the inner conductor is formed by twisting copper wires and compacting or is formed by twisting strand block conductors.
Specifically, the inner conductor adopts a structure formed by twisting and compacting copper wires or twisting strand conductors, so that the cable has good electrical performance and relatively smaller cable outer diameter. The pitch of the twisted wire is reasonably controlled in the design and manufacturing process, so that the cable has certain flexibility while ensuring good electrical performance, and can be continuously bent and conveniently installed in a narrow space, thereby being convenient and quick.
Further, 27.5kV bipolar self-shielding cable for electrified railway: the inner conductor shielding layer, the insulating layer and the insulating shielding layer adopt a three-layer extrusion-supplying structure.
Preferably, the insulating layer is made of cross-linked polyethylene (XLPE).
Further, 27.5kV bipolar self-shielding cable for electrified railway: the bipolar self-shielding cable further comprises a cushion layer, wherein the cushion layer is arranged between the insulating shielding layer and the outer conductor.
Further, 27.5kV bipolar self-shielding cable for electrified railway: the pad layer adopts the semiconductive belt, the pad layer be used for keeping apart insulating shield with the outer conductor prevents that the outer conductor from stabbing insulating shield.
Preferably, in order to prevent the outer conductor from damaging the insulation shield, the bipolar self-shielding cable designed by the utility model is buffered by wrapping a semi-conductive tape (cushion layer) on the outer side of the insulation shield.
Further, 27.5kV bipolar self-shielding cable for electrified railway: the outer conductor is made of round copper wires or special-shaped copper monofilaments through winding or wrapping, and the winding is round.
Specifically, the design section of the outer conductor should be determined according to the current requirement, and is generally selected to be consistent with the nominal section of the inner conductor, and the process of the outer conductor can be determined according to the nominal section. Taking a copper wire winding process as an example, when one layer of copper wire cannot meet the section requirement, a multi-layer structure can be adopted, contact among the multi-layer copper wires is ensured, and copper strips or semi-conductive tape strips are adopted when the multi-layer copper wire needs to be fastened.
Specifically, the outer conductor structure designed by the utility model can reduce electromagnetic interference of harmonic waves generated by the positive electrode and the negative electrode to other peripheral communication cables while playing a role in self-shielding, ensuring stable electrical performance and reliable transmission performance, and weakening skin effect and proximity effect generated under the influence of the harmonic waves, thereby really achieving the effects of environmental protection and energy saving. And (3) injection: the skin effect is also called skin effect, and when an alternating current passes through a conductor, the current will concentrate on the surface of the conductor and flow through it. Skin effect is a term of electromagnetics, eddy current. The phenomenon is that a magnetic field with opposite directions is generated on the surface of a non-energized ferromagnetic material by the energized ferromagnetic material, and the current cutting magnetic lines is generated by the magnetic field, and the current is a so-called vortex current, and is a skin effect.
Further, 27.5kV bipolar self-shielding cable for electrified railway: the bipolar self-shielding cable further comprises a copper strip, wherein the copper strip is arranged between the outer conductor and the inner sheath, and the copper strip is arranged on the surface of the outer conductor in a clearance or overlapping winding mode.
Preferably, the copper strip designed by the utility model can prevent the conductive performance from being influenced by broken copper wires of the outer conductor; on the other hand, the cable structure outer diameter can be optimized, and the anti-interference performance of the outer conductor can be improved.
Further, 27.5kV bipolar self-shielding cable for electrified railway: the inner sheath is used for isolating the outer conductor from the armor layer; the inner sheath is formed by extruding PVC, polyethylene or a material with flame retardant, fire-resistant, halogen-free and low-smoke flame retardant properties.
Specifically, the inner sheath is formed by extruding and wrapping halogen-free low-smoke flame-retardant polyolefin materials with high crusting and low heat value release performance or other materials capable of meeting specific requirements of the electrified railway, such as PVC, polyethylene or materials with flame retardant, fire-resistant, halogen-free low-smoke flame retardant performance. The inner sheath is used for isolating the outer conductor and the armor layer, and plays a role in preventing the outer conductor from being damaged by the armor layer.
Further, 27.5kV bipolar self-shielding cable for electrified railway: the armor layer adopts a single-layer metal wire tightly-wound structure or adopts a metal belt overlapped-wound structure; the single-layer metal wire is selected from one of an aluminum wire, a copper wire, a steel wire or an aluminum alloy wire; the metal belt is selected from brass belt or nonmagnetic steel belt.
Specifically, the armor layer can prevent mechanical damage and ensure the integrity of the cable structure and the stability of the electrical performance.
Further, 27.5kV bipolar self-shielding cable for electrified railway: the outer sheath is formed by extruding and wrapping a material with single or combined performance of flame retardance, halogen-free performance and low smoke performance.
The utility model has the beneficial effects that:
(1) The 27.5kV bipolar self-shielding cable for the electrified railway can effectively save the cable laying cost, optimize the laying space and has higher cost performance: the bipolar self-shielding cable for the electrified railway is upgraded on the basis of a traditional electrified railway 27.5kV single-phase alternating-current crosslinked polyethylene insulated cable, and adopts a bipolar structural design, so that the original two cables are combined into one, the positive electrode and the negative electrode of the cable are integrated in the same cable, the cable structure is greatly simplified, the compact structure, the light weight and the small volume of the cable are effectively ensured, the laying difficulty is greatly reduced, the laying workload and the cost are reduced, and the laying space is optimized. Meanwhile, the bipolar concentric type cable structure after the optimal design of the utility model not only can ensure stable electrical and mechanical properties, but also is suitable for various laying environment requirements, and has higher cost performance than the traditional electrified railway cable.
(2) The 27.5kV bipolar self-shielding cable for the electrified railway has double anti-interference performance, can effectively reduce harmonic pollution in a power grid, and has higher safety and reliability: the cable designed by the utility model adopts a bipolar structural design, and can play a role in dual anti-interference; firstly, the product organically integrates the traditional two positive and negative cables into the same cable, the concentric structure of the positive and negative electrodes greatly reduces the distance between the positive and negative electrodes of the cable, effectively reduces the harmonic electromagnetic interference of the single-phase alternating current cable to other cables in a narrow laying space, and is first anti-interference, namely, the interference of the single-phase alternating current cable to the outside. Then, the cable after optimization and upgrading can also protect the cable from external interference under the self-negative shielding structure, so that the signal transmission effect under the electrified railway laying environment is better, and the second interference is the second interference.
(3) The bipolar cable structure designed by the utility model can reduce harmonic waves generated between the positive electrode and the negative electrode, further reduce harmonic pollution to a power grid, protect the quality of the power grid, further weaken the additional heating phenomenon of a cable line caused by harmonic interference and prolong the service life of the cable. Meanwhile, the cable structure after the optimization design of the utility model is more stable, the corresponding electrical performance is better than that of the traditional structure, the electric field intensity distribution after improvement is more uniform, and the cable structure is safer and more reliable.
(4) The 27.5kV bipolar self-shielding cable for the electrified railway can reduce transmission loss, improve the current carrying capacity of the cable, and effectively realize cost reduction and energy saving in the cable industry: the product simplifies the ground wire of the original multi-core cable into a metal shielding structure on the coaxial cable, is not only beneficial to structural compensation of the cable, but also reduces the transmission loss of a cable line while overcoming harmonic interference, and improves the current carrying capacity of the electrified railway cable. Compared with the traditional electrified railway cable, the improved single-core alternating-current cable can achieve the effects of reducing loss and improving the current carrying capacity by about 10% while ensuring that the cable reactance is basically unchanged, and can effectively achieve cost reduction and energy saving in the cable industry. In addition, the bipolar structure of the utility model can optimize the production procedure and process of the electrified railway cable, thereby not only greatly reducing the production and manufacturing cost, but also improving the production efficiency and quality and being more beneficial to the production and manufacturing of enterprises.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a bipolar self-shielding cable for an electrified railway according to embodiment 1 of the present utility model;
fig. 2 is a schematic structural diagram of a bipolar self-shielding cable for an electrified railway according to embodiment 2 of the present utility model.
The marks in the figure: 1 inner conductor, 2 inner conductor shielding layer, 3 insulating layer, 4 insulating shielding layer, 5 cushion layer, 6 outer conductor, 7 copper strips, 8 inner sheath, 9 armor layer, 10 belting, 11 outer sheath.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," and the like indicate orientations or positional relationships, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the feature, either explicitly or implicitly. Moreover, the terms "first," "second," and the like, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.
Example 1
As shown in fig. 1, a 27.5kV bipolar self-shielding cable for an electrified railway, wherein the bipolar self-shielding cable includes: the inner conductor 1, the inner conductor shielding layer 2, the insulating layer 3, the insulating shielding layer 4, the cushion layer 5, the outer conductor 6, the copper strip 7, the inner sheath 8, the armor layer 9, the wrapping tape 10 and the outer sheath 11 are sleeved in sequence from inside to outside;
wherein: the inner conductor 1 is formed by twisting and compacting copper wires or is formed by twisting strand block conductors;
the inner conductor shielding layer 2, the insulating layer 3 (XLPE) and the insulating shielding layer 4 adopt a three-layer extrusion-supplying structure;
the cushion layer 5 is made of a semi-conductive tape and is used for isolating the insulating shield 4 from the outer conductor 6, so that the outer conductor 6 is prevented from being crushed and the insulating shield 4 is prevented from being punctured, and the cushion layer plays a role in isolating and buffering;
the outer conductor 6 is made of round copper wires or special-shaped copper monofilaments through winding or wrapping, and is round and round; specifically, the outer conductor 6 is wound by adopting the scheme shown in the following table 1 to meet the requirements of different laying occasions; the design section of the outer conductor 6 is determined according to the current requirement, and a conductor which is consistent with the nominal section of the inner conductor 1 is generally selected, and the process of the conductor can be determined according to the nominal section; taking a copper wire winding process as an example, when a layer of copper wire cannot meet the section requirement, a multi-layer structure can be adopted, contact among the multi-layer copper wires is ensured, and copper strips or semi-conductive tape strips are adopted when the copper wires need to be fastened;
the copper strip 7 is arranged between the outer conductor 6 and the inner sheath 8, the copper strip 7 is arranged on the surface of the outer conductor 6 in a clearance or overlapping wrapping way, the copper strip 7 is used for preventing the copper wire broken wire in the outer conductor 6 from influencing the conductivity, and meanwhile, the cable structure outer diameter can be optimized, and the anti-interference performance can be improved;
the inner sheath 8 is used for isolating the outer conductor 6 from the armor layer 9; specifically, the inner sheath 8 is made of halogen-free, low-smoke and flame-retardant polyolefin materials with high crust and low heat value release performance or other materials capable of meeting specific requirements of the electrified railway (see table 2), for example, is formed by extrusion of PVC, polyethylene or materials with flame-retardant, fire-resistant, halogen-free, low-smoke and flame-retardant performances, and the inner sheath 8 is used for isolating the outer conductor 6 from the armor layer 9 and plays a role in preventing the outer conductor 6 from being crushed and damaged by the armor layer 9;
the armor layer 9 is formed by tightly wrapping a single-layer metal wire, wherein the metal wire can be one of an aluminum wire, a copper wire, a steel wire and an aluminum alloy wire, as shown in fig. 1;
the outer sheath 11 is made of a halogen-free low-smoke flame retardant polyolefin material with high cracking resistance, high crust formation and low heat value release performance or other materials capable of meeting specific requirements of the electrified railway, such as a material with single or combined performance requirements of flame retardance, halogen free, low smoke and the like (see table 2) through extrusion.
Specifically, for the actual material selection of the inner sheath 8 and the outer sheath 11, the selection schemes listed in table 3 can be referred to or any combination can be performed according to the actual requirements, so as to meet the performance requirements of specific laying or use occasions.
Example 2
Example 2 differs from example 1 in that: the armor layer 9 described in example 2 is a metal tape overlapping wrap structure and the metal tape is selected from brass tape or nonmagnetic steel tape; the bipolar self-shielded cable for an electrified railway provided in embodiment 2 has a structure as shown in fig. 2.
Table 1 shows the winding process of the outer conductor
Table 2 shows jacket materials
Table 3 shows the material selection scheme for the outer conductor winding, the inner sheath and the outer sheath and the applicable scenario
The utility model provides a material selection scheme suitable for laying various electrified railways and suitable for the environment, and can meet the diversified performance requirements of the electrified railways.
The bipolar self-shielding cable for the electrified railway, provided by the utility model, considers various outer conductor schemes to be suitable for different laying environment requirements under the condition of ensuring the electrical performance and quality requirements of the cable, and simultaneously provides various sheath material schemes to meet the requirements of the electrified railway cable under different running environments.
The above-described preferred embodiments of the present utility model are only for illustrating the present utility model, and are not to be construed as limiting the present utility model. Obvious changes and modifications of the utility model, which are introduced by the technical solution of the present utility model, are still within the scope of the present utility model.
Claims (9)
1. 27.5kV bipolar self-shielding cable for electrified railway, characterized in that the bipolar self-shielding cable comprises: an inner conductor (1) is sleeved and arranged from inside to outside in sequence,
An inner conductor shielding layer (2), an insulating layer (3), an insulating shielding layer (4), an outer conductor (6), an inner sheath (8), an armor layer (9), a wrapping tape (10) and an outer sheath (11).
2. The 27.5kV bipolar self-shielding cable for the electrified railway according to claim 1, wherein the inner conductor (1) is formed by tightly twisting copper wires or by twisting strand block conductors.
3. The 27.5kV bipolar self-shielded cable for an electrified railway according to claim 1, wherein the inner conductor shielding layer (2), the insulating layer (3) and the insulating shielding layer (4) adopt a three-layer co-extrusion structure.
4. The 27.5kV bipolar self-shielded cable for an electrified railway according to claim 1, further comprising a bedding layer (5), wherein the bedding layer (5) is disposed between the insulating shielding layer (4) and the outer conductor (6).
5. The 27.5kV bipolar self-shielded cable for an electrified railway according to claim 4, wherein the pad layer (5) is a semiconductive tape, and the pad layer (5) is used to isolate the insulating shield layer (4) from the outer conductor (6).
6. 27.5kV bipolar self-shielded cable for electrified railways according to claim 1, characterized in that the outer conductor (6) is made of round copper wire or wound or wrapped with profiled copper monofilament and is subject to rounding of winding.
7. The 27.5kV bipolar self-shielding cable for an electrified railway according to claim 1, further comprising a copper strip (7), wherein the copper strip (7) is disposed between the outer conductor (6) and the inner sheath (8), and the copper strip (7) is disposed on the surface of the outer conductor (6) in a gap or overlapping wrapping manner.
8. 27.5kV bipolar self-shielded cable for electrified railways according to claim 1, characterized in that said inner sheath (8) is used to isolate said outer conductor (6) from said armor layer (9); the inner sheath (8) is formed by extruding PVC and polyethylene.
9. 27.5kV bipolar self-shielding cable for electrified railway according to claim 1, characterized in that said armor layer (9) adopts a single-layer wire tight-wrapping structure or adopts a metal tape overlapping-wrapping structure; the single-layer metal wire is selected from one of an aluminum wire, a copper wire, a steel wire or an aluminum alloy wire; the metal belt is selected from brass belt or nonmagnetic steel belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320545225.XU CN219842832U (en) | 2023-03-20 | 2023-03-20 | 27.5kV bipolar self-shielding cable for electrified railway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320545225.XU CN219842832U (en) | 2023-03-20 | 2023-03-20 | 27.5kV bipolar self-shielding cable for electrified railway |
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| Publication Number | Publication Date |
|---|---|
| CN219842832U true CN219842832U (en) | 2023-10-17 |
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|---|---|---|---|
| CN202320545225.XU Active CN219842832U (en) | 2023-03-20 | 2023-03-20 | 27.5kV bipolar self-shielding cable for electrified railway |
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| Country | Link |
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| CN (1) | CN219842832U (en) |
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- 2023-03-20 CN CN202320545225.XU patent/CN219842832U/en active Active
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