CN214671937U - Multi-section medium-voltage cable - Google Patents
Multi-section medium-voltage cable Download PDFInfo
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- CN214671937U CN214671937U CN202023018329.0U CN202023018329U CN214671937U CN 214671937 U CN214671937 U CN 214671937U CN 202023018329 U CN202023018329 U CN 202023018329U CN 214671937 U CN214671937 U CN 214671937U
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Abstract
The utility model relates to a medium voltage cable technical field, concretely relates to many cross-sections medium voltage cable, electric core, interior semiconduction shielding layer, insulating layer, outer semiconduction shielding layer, metallic shield layer and the protective layer of constituteing including a plurality of fan-shaped conductors, interior semiconduction shielding layer includes interior semiconduction ligature area and interior semiconduction layer that blocks water, interior semiconduction ligature area that blocks water is outside at electric core around the package, interior semiconduction layer is made by semiconductive material, the layer of semiconduction ligature area that blocks water including interior semiconduction layer sets up. The utility model provides a medium voltage cable can bear the heavy current, has higher electric power transmission power to the ability that blocks water is excellent, can also prevent effectively that the rodent from gnawing and stinging the destruction.
Description
Technical Field
The utility model relates to a medium voltage cable technical field, concretely relates to many cross-sections medium voltage cable.
Background
Power cables are classified into medium and low voltage power cables (35 kv and below), high voltage cables (110 kv and above), ultra high voltage cables (275-800 kv) and extra high voltage cables (1000 kv and above) according to voltage class. Among them, the medium voltage cable has a wide application in the field of power transmission. According to different application scenes, different requirements are needed for various aspects of performances of the medium-voltage cable.
Generally, a medium voltage cable includes a battery core, an inner semiconductive shielding layer, an insulating layer, an outer semiconductive shielding layer, a metal shielding layer, a protective layer, and other basic functional layers. The two semi-conductive shielding layers are respectively arranged on the outer surface of the wire core and the outer surface of the insulating layer and are respectively called an inner semi-conductive shielding layer and an outer semi-conductive shielding layer. The inner semi-conductive shielding layer is used for homogenizing an electric field on the outer surface of the wire core, and partial discharge of the conductor and the insulating layer caused by unsmooth surface of the wire core and air gaps generated by twisting of the wire core is avoided. The outer semi-conductive shielding layer is well contacted with the outer surface of the insulating layer and has the same potential as the metal sheath, so that partial discharge between the outer semi-conductive shielding layer and the metal sheath due to the defects of cracks and the like on the insulating surface of the cable is avoided. For medium and low voltage power cables without metal sheaths, a metal shielding layer is added besides a semi-conductive shielding layer. The metal shielding layer is usually formed by wrapping a copper strip or a copper wire, and mainly plays a role in shielding an electric field.
The electric core in the traditional technology is usually a conductor formed by circularly twisting single cores, and the electric conduction area of the cable is limited due to the skin effect. Chinese utility model patent with publication number CN202120665U discloses a novel medium voltage crosslinked cable, the inner core is composed of three sector conductors with cross-sections of 120 degrees, and the electric core with multiple sector interfaces has more excellent conductive ability on the premise of the same cabling size.
However, in practical use, when the medium voltage cable is applied to shallow sea, mud flat and other environments, the longitudinal waterproof and radial waterproof capabilities of the medium voltage cable are obviously insufficient, and the rodent resistance of the medium voltage cable is also obviously insufficient in the environments with more rodents.
Disclosure of Invention
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the not enough problem of many cross-sections medium voltage cable water blocking ability among the prior art, and then provides a medium voltage cable that has more excellent water blocking ability.
In order to solve the above problem, the utility model provides a technical scheme as follows:
the utility model provides a many cross-sections medium voltage cable, includes electric core, interior semiconduction shielding layer, insulating layer, outer semiconduction shielding layer, metallic shield layer and the protective layer that a plurality of fan-shaped conductors constitute, interior semiconduction shielding layer includes interior semiconduction ligature area and interior semiconduction layer that blocks water, interior semiconduction ligature area that blocks water winds the package outside electric core, interior semiconduction layer is made by semiconductive material, the skin of semiconduction ligature area including interior semiconduction layer setting.
Optionally, the outer semiconductive shield layer comprises outer semiconductive water-blocking strapping tapes, and the outer semiconductive group of strapping tapes is wrapped outside the insulating layer.
Optionally, the insulating layer and the inner semiconductive layer are integrally formed.
Optionally, an armor layer is further arranged between the metal shielding layer and the protective layer, and the armor layer is formed by wrapping an aluminum-plastic composite tape on the metal shielding layer.
Optionally, the aluminum-plastic composite tape is in a tape shape, and the extending direction of the aluminum-plastic composite tape and the extending direction of the cable are wrapped outside the metal shielding layer in a consistent manner.
Optionally, an armored semi-conductive water-blocking binding tape is further arranged between the armored layer and the metal shielding layer, and the armored semi-conductive water-blocking binding tape is wrapped outside the metal shielding layer.
Optionally, the protective layer comprises a low density polyethylene layer, a nylon protective layer, and a medium density polyethylene layer.
Optionally, the protective layer comprises a low density polyethylene layer, a brass tape wrapping layer and a medium density polyethylene layer.
Optionally, the exterior of the protective layer is coated with a graphite layer.
The utility model provides a technical scheme has following technological effect:
1. the utility model provides a medium voltage cable, electric core, interior semiconduction shielding layer, insulating layer, outer semiconduction shielding layer, metallic shield layer and the protective layer that constitute including a plurality of fan-shaped conductors, interior semiconduction shielding layer includes interior semiconduction ligature area and interior semiconduction layer that blocks water, interior semiconduction ligature area that blocks water winds the package outside electric core, interior semiconduction layer is made by semiconductive material, the skin of semiconduction ligature area including interior semiconduction layer sets up.
After the traditional inner conductive shielding layer is set to be in the form that the water blocking binding belt is matched with the semi-conductive material, the inner semi-conductive shielding layer has a certain water blocking effect and can play a role in blocking water radially. Meanwhile, due to the wrapping process of the binding belt, the strength of the binding belt is higher than that of a common water-blocking layer, and the roundness of the spliced fan-shaped conductors can be ensured while water is blocked.
2. The utility model provides a medium voltage cable, outer semiconduction shielding layer includes outer semiconduction ligature area and outer semiconduction layer that blocks water, outer semiconduction group number ligature area is outside at the insulating layer around the package. Compare in ordinary outer semiconductive shield layer, use the ligature area that blocks water in this scheme to make into outer semiconductive shield layer, can avoid steam to see through inside the metallic shield layer infiltration cable, the effectual appearance that delays the water tree phenomenon, the ability that blocks water of cable obtains further the enhancement.
3. The utility model provides a medium voltage cable, insulating layer and interior semi-conducting layer integrated into one piece. The extrusion process is utilized to realize the integral forming of the insulating layer and the semi-conducting layer, the method can be used for one-step forming and extrusion coating on the cable, the integral strength of the cable can be improved, air generated between the insulating layer and the inner semi-conducting layer due to extrusion is avoided, and further discharging between the insulating layer and the electric core is reduced.
4. The utility model provides a medium voltage cable, still be provided with the armor between metallic shield and the protective layer, the armor comprises aluminum-plastic composite tape parcel on the metallic shield. The armor can effectually increase the ability of preventing nibbling of cable, makes the cable can adapt to harsher environment more.
5. The utility model provides a medium voltage cable, still be provided with the semi-conductive ligature that blocks water of armor between armor and the metallic shield layer, the semi-conductive ligature that blocks water of armor is outside at the metallic shield layer around the package. By means of the armored semi-conductive water-blocking binding belt, the water-blocking capacity of the cable can be further improved, and water vapor is prevented from permeating into the cable from the upper side of the metal shielding layer.
6. The utility model provides a medium voltage cable, the protective layer includes low density polyethylene layer, nylon protective layer and medium density polyethylene layer. The low-density polyethylene has good material shrinkage, can be tightly extruded and wrapped on the aluminum-plastic composite belt and tightly adhered with the aluminum-plastic belt film by adopting an extrusion die, can realize the longitudinal water blocking and radial water blocking of the wire core, has higher hardness, and can prevent rodent damage to a certain extent. The nylon protective layer has high hardness, no peculiar smell and environmental protection, and the nylon material is uniformly coated on the surface of the cable by using an extrusion process to prevent the gnawing of rodents. The medium-density polyethylene layer has the same characteristic of high hardness, and the combination of the nylon protective layer and the low-density polyethylene layer can form a three-layer anti-rodent structure, and meanwhile, the radial water blocking of the outer sheath of the cable is realized.
7. The utility model provides a medium voltage cable, the protective layer outside is filmed there is the graphite layer. The graphite belongs to a polar material and has extremely high conductivity, the insulating sheath is coated with the graphite, whether the outer sheath is damaged or not can be judged by applying voltage, and the graphite is insoluble in water and plays a role in blocking water to a certain extent.
To sum up, the utility model provides a medium voltage cable can bear the heavy current, has higher electric power transmission power to the ability that blocks water is excellent, can also prevent effectively that the rodent from gnawing and stinging the destruction.
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structure diagram of a medium voltage cable provided in embodiment 1 of the present invention;
description of reference numerals:
1-electric core, 2-inner semi-conductive water-blocking binding tape, 3-inner semi-conductive layer, 4-insulating layer, 5-outer semi-conductive layer, 6-outer semi-conductive water-blocking binding tape, 7-metal shielding layer, 8-armored semi-conductive water-blocking binding tape, 9-armored layer, 10-low density polyethylene layer, 11-nylon protective layer, 12-medium density polyethylene layer and 13-graphite layer.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1:
referring to fig. 1, the embodiment provides a medium voltage cable with multiple cross sections, which sequentially includes, from inside to outside, a battery core 1 composed of multiple sector conductors, an inner semiconductive shielding layer, an insulating layer 4, an outer semiconductive shielding layer, a metal shielding layer 7, an armored semiconductive binding tape, an armored layer 9, a protective layer, and a graphite layer 13,
the battery core 1 comprises five conductors with sector-shaped cross sections, and the five conductors are spliced into a circle. On the premise of the same cabling size, the process of splicing the five conductors can bear larger current, and semi-conductive water-blocking tapes are used between strand blocks to realize conductor water blocking.
Interior semiconductive shield layer includes interior semiconductive body ligature 2 and interior semiconductive layer 3 that blocks water, interior semiconductive body ligature 2 wraps around covering in electric core 1 outside, interior semiconductive layer 3 is made by semiconductive material, semiconductive body ligature 2's skin including interior semiconductive layer 3 sets up. The insulating layer 4 and the inner semiconductive layer 3 are integrally formed by an extrusion process. After the traditional inner conductive shielding layer is set to be in the form that the water blocking binding belt is matched with the semi-conductive material, the inner semi-conductive shielding layer has a certain water blocking effect and can play a role in blocking water radially. Meanwhile, due to the wrapping process of the binding belt, the strength of the binding belt is higher than that of a common water-blocking layer, and the roundness of the spliced fan-shaped conductors can be ensured while water is blocked.
The outer semiconductive shielding layer comprises outer semiconductive water-blocking binding tapes 6, and the outer semiconductive group binding tapes are wrapped outside the insulating layer 4. The water blocking capability of the cable is further enhanced. Outside the outer semiconducting layer 5, a metallic shield layer 7 is provided. An armored semi-conductive water-blocking binding belt is arranged outside the metal shielding layer 7, the armored semi-conductive water-blocking binding belt 8 is wrapped outside the metal shielding layer 7, and the armored semi-conductive water-blocking binding belt can prevent discharge between the armored layer 9 and the metal shielding layer 7. An armor layer 9 is arranged outside the armored semi-conductive water-blocking binding belt, and the armor layer 9 is formed by wrapping an aluminum-plastic composite belt on the metal shielding layer 7. The aluminum-plastic composite belt is in a belt shape, and the aluminum-plastic composite belt is wrapped outside the metal shielding layer 7 by adopting a longitudinal wrapping process.
The protective layer comprises a low density polyethylene layer 10, a nylon protective layer 11 and a medium density polyethylene layer 12. The low-density polyethylene has good material shrinkage, can be tightly extruded and wrapped on the aluminum-plastic composite belt and tightly adhered with the aluminum-plastic belt film by adopting an extrusion die, can realize the longitudinal water blocking and radial water blocking of the wire core, has higher hardness, and can prevent rodent damage to a certain extent. The nylon protective layer 11 has high hardness, no peculiar smell and environmental protection, and the nylon material is uniformly coated on the surface of the cable by using an extrusion process to prevent the gnawing of rodents. The medium-density polyethylene layer 12 also has the characteristic of high hardness, and can form a three-layer anti-rodent structure by combining the nylon protective layer 11 and the low-density polyethylene layer 10, and meanwhile, the radial water blocking of the outer sheath of the cable is realized.
As an alternative embodiment of the protective layer, the protective layer comprises a low density polyethylene layer 10, a brass tape wrapping and a medium density polyethylene layer 12.
The outside of the protective layer is coated with a graphite layer 13. The graphite belongs to a polar material and has extremely high conductivity, the insulating sheath is coated with the graphite, whether the outer sheath is damaged or not can be judged by applying voltage, and the graphite is insoluble in water and plays a role in blocking water to a certain extent.
The above-mentioned embodiment functions on the principle that the water-blocking capability of the cable is enhanced by designing the conventional inner and outer semiconductive shield layers as semiconductive water-blocking tapes and semiconductive layers. And meanwhile, the armoring layer 9 made of the aluminum-plastic composite belt is added, so that the biting prevention capability of the cable can be effectively improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. The utility model provides a many cross-sections medium voltage cable, includes electric core, interior semiconduction shielding layer, insulating layer, outer semiconduction shielding layer, metallic shield layer and the protective layer that a plurality of fan-shaped conductors constitute, its characterized in that, interior semiconduction shielding layer includes interior semiconduction ligature and the interior semiconduction layer of blocking water, interior semiconduction ligature that blocks water is around the package outside electric core, interior semiconduction layer is made by semiconductive material, the skin of semiconduction ligature including interior semiconduction layer setting.
2. A multi-section medium voltage cable according to claim 1 wherein said outer semiconductive shield layer comprises outer semiconductive water-blocking ties and outer semiconductive layers, said outer semiconductive groups of ties being wrapped around the outside of the insulation.
3. A multi-section medium voltage cable according to claim 1, wherein said insulating layer and inner semiconductive layer are integrally formed.
4. The medium voltage cable with multiple sections according to claim 1, wherein an armor layer is further disposed between the metal shielding layer and the protective layer, and the armor layer is formed by wrapping an aluminum-plastic composite tape on the metal shielding layer.
5. The medium voltage cable with multiple sections according to claim 4, wherein the aluminum-plastic composite tape is in a tape shape, and the extension direction of the aluminum-plastic composite tape is consistent with the extension direction of the cable and is wrapped outside the metal shielding layer.
6. The medium voltage cable with multiple sections according to claim 4, wherein an armored semi-conductive water-blocking binding tape is further arranged between the armor layer and the metal shielding layer, and the armored semi-conductive water-blocking binding tape wraps the outside of the metal shielding layer.
7. A multi-section medium voltage cable according to claim 1, characterized in that said protective layer comprises a low density polyethylene layer, a nylon protective layer and a medium density polyethylene layer.
8. A multi-section medium voltage cable according to claim 1, wherein the protective layer comprises a low density polyethylene layer, a brass tape wrapping and a medium density polyethylene layer.
9. A multi-section medium voltage cable according to claim 1, wherein the outer portion of the protective layer is coated with a graphite layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023018329.0U CN214671937U (en) | 2020-12-14 | 2020-12-14 | Multi-section medium-voltage cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023018329.0U CN214671937U (en) | 2020-12-14 | 2020-12-14 | Multi-section medium-voltage cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214671937U true CN214671937U (en) | 2021-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023018329.0U Active CN214671937U (en) | 2020-12-14 | 2020-12-14 | Multi-section medium-voltage cable |
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|---|---|
| CN (1) | CN214671937U (en) |
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- 2020-12-14 CN CN202023018329.0U patent/CN214671937U/en active Active
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