CN213400684U - Composite shielding medium-voltage variable-frequency cable - Google Patents
Composite shielding medium-voltage variable-frequency cable Download PDFInfo
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- CN213400684U CN213400684U CN202022569165.4U CN202022569165U CN213400684U CN 213400684 U CN213400684 U CN 213400684U CN 202022569165 U CN202022569165 U CN 202022569165U CN 213400684 U CN213400684 U CN 213400684U
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Abstract
The utility model discloses a composite shielding medium-voltage variable frequency cable, which comprises a cable core, wherein the cable core consists of a plurality of separated shielding water-blocking wire cores and fillers, and each separated shielding water-blocking wire core comprises an insulating wire core, a semi-conductive water-blocking tape wrapped outside the insulating wire core, a metal sheath extruded outside the semi-conductive water-blocking tape, an asphalt layer coated on the metal sheath and a polyethylene sheath extruded outside the asphalt layer; the insulated wire core comprises a central conductor, a conductor shielding layer, an insulating layer and an insulated shielding layer which are sequentially arranged from inside to outside; the cable core is wrapped with a water-blocking wrapping tape, the water-blocking wrapping tape is wrapped with a polyethylene sheath in an extruding mode, a main shielding layer is arranged outside the polyethylene sheath, and a PP rope is wound outside the main shielding layer. The cable adopts a sub-shielding and total shielding structure, obtains excellent shielding performance, has a better water blocking function, can resist high pulse voltage impact, can safely operate in a humid environment, and has long service life.
Description
Technical Field
The utility model relates to a power cable technical field, concretely relates to compound shielding middling pressure variable frequency cable.
Background
The variable frequency cable is mainly used for connecting a frequency converter and a motor as well as between the frequency converter and a power grid, and can be widely used for paper making, metallurgy, mines, railways, food industries and the like. Along with the development of industry, high-voltage high-power motor constantly appears, and the speed governing of middling pressure motor has become the problem that must solve again, and middling pressure converter is in response to the fortune, but because the change of transmission voltage grade has brought new problem again: firstly, the water blocking function of the medium-voltage variable frequency cable is realized; once water vapor enters the cable, the insulating cross-linked polyethylene of the medium-voltage cable is easy to generate water trees, and the service life of the cable is greatly reduced; secondly, the influence of pulse voltage on insulation; the frequency range of the variable frequency power supply is wider, but the waveform of the variable frequency power supply is a frequency band profile of a main frequency, contains a plurality of higher harmonics, has larger amplitude, and the harmonics can reach the cable and possibly cause the cable breakdown.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, an object of the utility model is to provide a compound shielding middling pressure variable frequency cable. The cable adopts a sub-shielding and total shielding structure, obtains excellent shielding performance, has a better water blocking function, can resist high pulse voltage impact, can safely operate in a humid environment, and has long service life.
For realizing above-mentioned technical purpose, reach above-mentioned technological effect, the utility model discloses a following technical scheme realizes:
a composite shielding medium-voltage frequency conversion cable comprises a cable core, wherein the cable core consists of a plurality of sub-shielding water-blocking wire cores and fillers filled among the plurality of sub-shielding water-blocking wire cores, each sub-shielding water-blocking wire core comprises an insulating wire core, a semi-conductive water-blocking tape wrapped outside the insulating wire core, a metal sheath wrapped outside the semi-conductive water-blocking tape in an extruding manner, an asphalt layer coated on the metal sheath and a polyethylene sheath wrapped outside the asphalt layer in an extruding manner; the insulated wire core comprises a central conductor, a conductor shielding layer, an insulating layer and an insulated shielding layer which are sequentially arranged from inside to outside; the cable core is wrapped with a water-blocking wrapping tape, the water-blocking wrapping tape is wrapped with a polyethylene sheath in an extruding mode, a total shielding layer is arranged outside the polyethylene sheath, and a layer of PP rope is wound outside the total shielding layer.
Furthermore, the metal sheath is an extruded aluminum pipe or aluminum alloy pipe, so that the water-blocking effect and the shielding effect can be achieved.
Further, the filler is a polypropylene filling rope.
Further, the insulating layer is a crosslinked polyethylene insulating layer.
Furthermore, the conductor shielding layer, the insulating layer and the insulating shielding layer are of a three-layer co-extrusion structure.
Furthermore, the total shielding layer is a copper wire woven total shielding layer or a copper strip wrapped total shielding layer.
Furthermore, the cable core comprises 3 split-shielding water-blocking wire cores which are twisted together.
Further, the cable is of a symmetrical structure.
The utility model has the advantages that:
the independent branch shielding water blocking wire core in the cable of the utility model achieves the water blocking and shielding effects through the metal sheath, and the total shielding layer is arranged outside the cable core, so that the superior shielding effect is realized through the composite structure of the branch shielding and the total shielding, and the shielding performance of the cable is improved by more than 20 percent compared with the existing cable; the semi-conductive water-blocking tape, the metal sheath, the asphalt layer and the water-blocking wrapping tape in the cable are matched, so that the cable is endowed with excellent water-blocking performance; the cable of the utility model can run safely for more than 20 years after being soaked in water for a long time, and has longer service life;
the cable can also resist high pulse voltage impact, and the symmetrical structure of the cable also improves the impact resistance of the cable;
a layer of PP rope is wound on the outer layer of the cable, so that the cable is good in wear resistance and is water-resistant and moisture-proof.
Drawings
Fig. 1 is the structure schematic diagram of the composite shielding medium voltage variable frequency cable of the present invention.
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.
As shown in fig. 1, the preferred embodiment of the composite shielded medium voltage variable frequency cable includes a cable core 1, the cable core 1 is composed of a plurality of partial-shielded water-blocking cable cores 11 and fillers 12 filled among the plurality of partial-shielded water-blocking cable cores 11, the partial-shielded water-blocking cable cores 11 include an insulated cable core 111, a semi-conductive water-blocking tape 112 wrapped outside the insulated cable core 111, a metal sheath 113 extruded outside the semi-conductive water-blocking tape 112, an asphalt layer 114 coated on the metal sheath 113, and a polyethylene sheath 115 extruded outside the asphalt layer 114; the insulated wire core 111 comprises a central conductor 1111, a conductor shielding layer 1112, an insulating layer 1113 and an insulated shielding layer 1114 which are arranged from inside to outside in sequence; the cable comprises a cable core 1 and is characterized in that a water-blocking wrapping tape 2 is wrapped on the periphery of the cable core 1, a polyethylene sheath 3 is extruded on the periphery of the water-blocking wrapping tape 2, a total shielding layer 4 is arranged outside the polyethylene sheath 3, and a PP rope 5 is wound on the periphery of the total shielding layer 4.
The metal sheath 113 is an extruded aluminum tube or aluminum alloy tube, which can not only achieve the water-blocking effect, but also achieve the shielding effect.
In this embodiment, the filler 12 is a polypropylene filled rope; the insulating layer 1113 is a crosslinked polyethylene insulating layer.
In this embodiment, the conductor shield layer 1112, the insulation layer 1113, and the insulation shield layer 1114 are sequentially extruded onto the center conductor 1111 by a three-layer co-extrusion process.
In this embodiment, the total shielding layer 4 is a copper wire woven total shielding layer, and in other embodiments, the total shielding layer may also be a copper tape wrapped total shielding layer.
In this embodiment, the number of the sub-shielding water-blocking wire cores in the cable core 1 is 3, and the 3 sub-shielding water-blocking wire cores are twisted together.
In this embodiment, the cable is of a symmetrical construction, which improves its impact resistance.
Compared with the prior art, the utility model discloses a cable has following advantage:
the independent sub-shielding water-blocking wire core 11 in the cable of the utility model achieves the water-blocking and shielding effects through the metal sheath 113 therein, and the total shielding layer 4 is arranged outside the cable core 1, so that through the composite structure of sub-shielding and total shielding, the excellent shielding effect is realized, and the shielding performance of the cable is improved by more than 20 percent compared with the existing cable; the semi-conductive water-blocking tape 112, the metal sheath 113, the asphalt layer 114 and the water-blocking wrapping tape 2 in the cable are matched, so that the cable is endowed with excellent water-blocking performance; the cable of the utility model can run safely for more than 20 years after being soaked in water for a long time, and has longer service life;
in addition, the cable can also resist high pulse voltage impact, and the symmetrical structure of the cable also improves the impact resistance of the cable; the PP rope wound on the outer layer of the cable enables the cable to be good in wear resistance and water-blocking and moisture-proof.
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 (8)
1. The utility model provides a compound shielding medium voltage variable frequency cable which characterized in that: the cable comprises a cable core, wherein the cable core consists of a plurality of sub-shielding water-blocking wire cores and fillers filled among the plurality of sub-shielding water-blocking wire cores, each sub-shielding water-blocking wire core comprises an insulating wire core, a semi-conductive water-blocking tape wrapped outside the insulating wire core, a metal sheath extruded outside the semi-conductive water-blocking tape, an asphalt layer coated on the metal sheath and a polyethylene sheath extruded outside the asphalt layer; the insulated wire core comprises a central conductor, a conductor shielding layer, an insulating layer and an insulated shielding layer which are sequentially arranged from inside to outside; the cable core is wrapped with a water-blocking wrapping tape, the water-blocking wrapping tape is wrapped with a polyethylene sheath in an extruding mode, a total shielding layer is arranged outside the polyethylene sheath, and a layer of PP rope is wound outside the total shielding layer.
2. The composite shielded medium voltage frequency conversion cable according to claim 1, wherein: the metal sheath is an extruded aluminum pipe or an aluminum alloy pipe.
3. The composite shielded medium voltage frequency conversion cable according to claim 1, wherein: the filler is a polypropylene filling rope.
4. The composite shielded medium voltage frequency conversion cable according to claim 1, wherein: the insulating layer is a crosslinked polyethylene insulating layer.
5. The composite shielded medium voltage frequency conversion cable according to claim 1, wherein: the conductor shielding layer, the insulating layer and the insulating shielding layer are of a three-layer co-extrusion structure.
6. The composite shielded medium voltage frequency conversion cable according to claim 1, wherein: the total shielding layer is a copper wire woven total shielding layer or a copper strip wrapped total shielding layer.
7. The composite shielded medium voltage frequency conversion cable according to claim 1, wherein: the cable core comprises 3 split-shielding water-blocking wire cores which are twisted together.
8. The composite shielded medium voltage frequency conversion cable according to claim 1, wherein: the cable is of a symmetrical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022569165.4U CN213400684U (en) | 2020-11-09 | 2020-11-09 | Composite shielding medium-voltage variable-frequency cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022569165.4U CN213400684U (en) | 2020-11-09 | 2020-11-09 | Composite shielding medium-voltage variable-frequency cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213400684U true CN213400684U (en) | 2021-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022569165.4U Expired - Fee Related CN213400684U (en) | 2020-11-09 | 2020-11-09 | Composite shielding medium-voltage variable-frequency cable |
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| Country | Link |
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| CN (1) | CN213400684U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114783663A (en) * | 2022-04-27 | 2022-07-22 | 远东电缆有限公司 | Aluminum alloy protective layer for new energy automobile and manufacturing method thereof |
-
2020
- 2020-11-09 CN CN202022569165.4U patent/CN213400684U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114783663A (en) * | 2022-04-27 | 2022-07-22 | 远东电缆有限公司 | Aluminum alloy protective layer for new energy automobile and manufacturing method thereof |
| CN114783663B (en) * | 2022-04-27 | 2024-04-19 | 远东电缆有限公司 | Aluminum alloy protective layer for new energy automobile and manufacturing method thereof |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210608 Termination date: 20211109 |
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| CF01 | Termination of patent right due to non-payment of annual fee |