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CN-122026137-A - High-durability corona-resistant medium-voltage cable

CN122026137ACN 122026137 ACN122026137 ACN 122026137ACN-122026137-A

Abstract

The invention discloses a high-durability corona-resistant medium-voltage cable, wherein a positioning rubber ring sleeve is equidistantly arranged on the surface of a rubber protective layer, positioning grooves are formed in the middle of the positioning rubber ring sleeve, an insulating rubber wrapping sleeve is sleeved at the end part of the rubber protective layer, elastic rubber round sleeves are fixedly connected to the two ends of the insulating rubber wrapping sleeve, arc-shaped positioning clinging blocks are fixedly connected to the bottoms of the end parts of the elastic rubber round sleeves, splicing grooves are formed in the two ends of the tops of the arc-shaped positioning clinging blocks, arc-shaped movable clinging blocks are arranged at the tops of the arc-shaped positioning clinging blocks, splicing blocks are fixedly connected to the two ends of the arc-shaped movable clinging blocks.

Inventors

  • LI LISHUANG
  • GENG LITAO
  • CAO XIAOMEI
  • GENG LEI
  • NING QIYUAN
  • XUE HAN
  • ZHU XIAOQI
  • WANG JIANCHUANG

Assignees

  • 顺心线缆有限公司

Dates

Publication Date
20260512
Application Date
20260318

Claims (10)

  1. 1. The high-durability corona-resistant medium-voltage cable comprises three cores (1) and is characterized in that the surfaces of the three cores (1) are sleeved with metal shielding layers (2), the surfaces of the three metal shielding layers (2) are extruded and wrapped with rubber insulating layers (3), the outer sides of the surfaces of the three rubber insulating layers (3) are sleeved with rubber protective layers (4), and the surfaces of the end parts of the rubber protective layers (4) are provided with joint sealing corona-resistant mechanisms (5); The joint sealing corona-resistant mechanism (5) comprises a positioning rubber ring sleeve (501); The surface of the rubber protection layer (4) is provided with positioning rubber ring sleeves (501) at equal intervals, the middle parts of the positioning rubber ring sleeves (501) are provided with positioning grooves (502), the end parts of the rubber protection layer (4) are sleeved with insulating rubber wrapping sleeves (503), and the two ends of each insulating rubber wrapping sleeve (503) are fixedly connected with elastic rubber round sleeves (504); The bottom fixedly connected with arc location of elasticity rubber circle cover (504) tip is hugged closely piece (505), splice groove (506) have all been seted up at the both ends at piece (505) top are hugged closely in the arc location, arc activity is hugged closely the top of piece (505) and is installed arc activity and hugs closely piece (507), the both ends that piece (507) were hugged closely in the arc activity are all fixedly connected with splice piece (508), two install mounting bolt (509) in the middle part of splice piece (508).
  2. 2. The high-durability corona resistant medium voltage cable according to claim 1, characterized in that the diameter of the cross section of the insulating rubber wrap (503) is larger than the diameter of the elastic rubber round sleeve (504), and the elastic rubber round sleeve (504) is tightly attached to the surface of the rubber protection layer (4).
  3. 3. The high-durability corona-resistant medium voltage cable according to claim 1, wherein the arc-shaped positioning cling block (505) and the arc-shaped movable cling block (507) are movably embedded into the positioning groove (502), the splicing block (508) is embedded into the splicing groove (506), and the splicing block (508) and the arc-shaped positioning cling block (505) are fixedly connected through a mounting bolt (509).
  4. 4. The high-durability corona-resistant medium voltage cable according to claim 1, wherein one end of the arc movable cling block (507) is fixedly connected with an arc sealing compression bar (510), the top of the end of the elastic rubber round sleeve (504) is connected with an extending sealing rubber strip (511), the top of the insulating rubber wrapping sleeve (503) is provided with an exhaust channel (512), and the inside of the exhaust channel (512) is embedded with a sealing rubber piston (513).
  5. 5. The high durability corona resistant medium voltage cable according to claim 4, wherein said extended sealing rubber strip (511) extends to the surface of said positioning rubber collar (501), said arcuate sealing bead (510) and arcuate movable contact block (507) both being pressed against the surface of said extended sealing rubber strip (511).
  6. 6. The high-durability anti-corona medium voltage cable according to claim 5, characterized in that the rubber protection layer (4) is internally provided with a positioning corona monitoring mechanism (6); the positioning corona monitoring mechanism (6) comprises a triangular positioning supporting rubber frame (601); The inner part of the rubber protection layer (4) is provided with a triangular positioning supporting rubber frame (601), a central limiting rubber strip (602) is arranged at the central position inside the triangular positioning supporting rubber frame (601), and the bottom ends of the central limiting rubber strips (602) are equidistantly connected with supporting columns (603); Three corner positions of the triangular positioning support rubber frame (601) are respectively embedded and provided with a conductive metal strip (604), the surfaces of the three corner positions of the triangular positioning support rubber frame (601) are respectively provided with an arc-shaped metal attaching sheet (605) in an attaching mode, and the surfaces of the three arc-shaped metal attaching sheets (605) are fixedly connected with metal conductive short columns (606); The surface mounting of the rubber protection layer (4) is provided with an upper arc-shaped fixed block (607), two ends of the upper arc-shaped fixed block (607) are connected with assembly soft rubber strips (608), two ends of the assembly soft rubber strips (608) are fixedly connected with side fixed blocks (609), two side fixed blocks (609) are fixedly connected with arc-shaped sealing joint blocks (610) on two sides of the side fixed blocks (609) and two sides of the upper arc-shaped fixed block (607), the inner wall of the upper arc-shaped fixed block (607) and the inner wall of the two side fixed blocks (609) are fixedly provided with arc-shaped metal contact guide plates (611), the bottom ends of the two side fixed blocks (609) are connected with clinging joint blocks (612), and locking bolts (613) are arranged in the middle of the clinging joint blocks (612); The inside of triangle location support rubber frame (601) is filled with shaping rubber anti-collapse layer (614), the inside of rubber inoxidizing coating (4) is filled with fiber filling layer (615), buffer protection gasbag (616) are installed along circumferencial direction equidistance embedding in the inside of fiber filling layer (615).
  7. 7. The high-durability corona-resistant medium voltage cable according to claim 6, wherein three cores (1) are equidistantly distributed inside a triangular positioning supporting rubber frame (601), and the surface wall of the rubber insulating layer (3) is attached to the inner wall of the triangular positioning supporting rubber frame (601).
  8. 8. The high durability corona resistant medium voltage cable according to claim 6, wherein the positions of three said arcuate metal bonding sheets (605) and the positions of three conductive metal strips (604) correspond to each other, said arcuate metal bonding sheets (605) being in close contact with the surfaces of the conductive metal strips (604).
  9. 9. The high durability corona resistant medium voltage cable according to claim 6 wherein said metallic conductive studs (606) are movably penetrated through said fiber fill layer (615) and said rubber protective layer (4), wherein three of said arcuate metallic contact guides (611) are positioned to correspond to three metallic conductive studs (606), wherein three of said arcuate metallic contact guides (611) are positioned to abut ends of said three metallic conductive studs (606), and wherein said arcuate metallic contact guides (611) are connected to an external electrical leakage monitoring device.
  10. 10. The high-durability corona resistant medium voltage cable according to claim 6, wherein the arc-shaped sealing joint block (610) and the assembling soft rubber strip (608) are tightly attached to the surface of the rubber protective layer (4), and the two tightly attached joint blocks (612) are mutually attached and locked and fixed by locking bolts (613).

Description

High-durability corona-resistant medium-voltage cable Technical Field The invention relates to the technical field of medium voltage cables, in particular to a high-durability corona-resistant medium voltage cable. Background The medium-voltage cable is a main force army of power transmission and is specially designed for 3-35 kilovolt voltage, and is widely used for urban power grid, factory power distribution and new energy transmission, the core structure of the medium-voltage cable comprises a conductor, an insulating layer and a sheath, the stable power transmission can be ensured, corona refers to the phenomenon that the surface of a charged body is subjected to partial discharge in a gas or liquid medium, substances such as ozone and nitrogen oxide can be generated around a high-voltage wire and near the tip of the charged body, on a power substation and a circuit, a light layer similar to a solar corona frequently appears, sound of 'Achler' is generated, the corona can consume electric energy and interfere radio waves, and in the cable, the corona phenomenon can lead to gradual damage of insulating materials, thereby influencing the service life and the safety performance of the cable; However, the joint of the existing cable is poor in protection effect, the joint is not protected in a sealed environment, so that the ageing damage probability of an insulating material connected with the joint is high, and a corona phenomenon is easy to generate. Disclosure of Invention The invention provides a high-durability corona-resistant medium-voltage cable, which can effectively solve the problems that the joint of the cable provided in the background art is poor in protection effect, the joint is not protected in a sealed environment, the ageing and damage probability of insulating materials connected at the joint is high, and a corona phenomenon is easy to generate. In order to achieve the aim, the high-durability corona-resistant medium-voltage cable comprises three cores, wherein the surfaces of the three cores are sleeved with metal shielding layers, rubber insulating layers are extruded and wrapped on the surfaces of the three metal shielding layers, rubber protective layers are sleeved on the outer sides of the surfaces of the three rubber insulating layers, and joint sealing corona-resistant mechanisms are arranged on the surfaces of the end parts of the rubber protective layers; the joint sealing corona-resistant mechanism comprises a positioning rubber ring sleeve; The surface of the rubber protection layer is equidistantly provided with positioning rubber ring sleeves, the middle parts of the positioning rubber ring sleeves are provided with positioning grooves, the end parts of the rubber protection layer are sleeved with insulating rubber wrapping sleeves, and the two ends of the insulating rubber wrapping sleeves are fixedly connected with elastic rubber round sleeves; The bottom fixedly connected with arc location of elasticity rubber circle cover tip is hugged closely the piece, the splice groove has all been seted up at the both ends that the piece top was hugged closely in the arc location, the arc activity is hugged closely the top of piece and is installed the arc activity, the both ends that the piece was hugged closely in the arc activity are all fixedly connected with splice piece, two the mounting bolt is all installed at the middle part of splice piece. According to the technical scheme, the diameter of the cross section of the insulating rubber wrapping sleeve is larger than that of the elastic rubber round sleeve, and the elastic rubber round sleeve is tightly attached to the surface of the rubber protective layer. According to the technical scheme, the arc-shaped positioning cling blocks and the arc-shaped movable cling blocks are movably embedded into the positioning grooves, the splicing blocks are embedded into the splicing grooves, and the splicing blocks and the arc-shaped positioning cling blocks are fixedly connected through the mounting bolts. Compared with the prior art, the invention has the beneficial effects that the structure is scientific and reasonable, and the use is safe and convenient: 1. The cable connector is wrapped and protected by the insulating rubber wrapping sleeve, so that the cable connector is prevented from being directly exposed in the external environment and contacting with air to generate corona phenomenon, the cable connector is protected by removing a medium which can generate corona at the position of the cable connector, and the arc positioning clinging block and the arc movable clinging block are matched with each other to clamp and fix the two ends of the insulating rubber wrapping sleeve, so that the safety sealing performance is improved, and air permeation is prevented; Meanwhile, the positioning rubber ring sleeve and the positioning groove are matched with each other, the arc positioning clinging block and the arc movable clinging block