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Watertight power cable and processing technology thereof

A power cable and water blocking technology, which is applied in the direction of power cables with shielding layer/conductive layer, insulated cables, cable/conductor manufacturing, etc., can solve the problems of cable accidents, increase the formation of water trees, infiltration, etc., and achieve the benefit of laying Construction, improve water blocking effect, and prevent damage

Inactive Publication Date: 2015-05-20
INNER MONGOLIA RENDA SPECIAL CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In humid areas with high groundwater level and perennial rain, it is better to use water-resistant power cables for buried cables. If ordinary power cables are used, moisture will easily penetrate into the cable or enter the cable from the damaged sheath, which will eventually cause cable accidents.
[0003] Ordinary water-blocking power cables operate in a humid environment for a long time. Moisture is also easy to infiltrate from the damaged parts that are damaged by mechanical stress or external force during laying and operation. The moisture that penetrates into the cable insulation will increase under the action of the electric field. The probability of forming water trees, a large number of water trees will cause a sharp decline in the insulation and mechanical properties of cables, and the aging of water trees will also lead to the cracking of polymer insulation, so that under the action of an electric field, water trees will transform into permanent electric trees. In a short time, the cable insulation will be broken down, eventually causing cable accidents
[0004] In the conventional power cable process, the cable cores are twisted and filled with water-blocking tape at the same time. After filling, there are still gaps between the cores and the inner sheath, and moisture can enter through the gaps. Inside the cable insulation, moisture will form a water tree under the action of the electric field, resulting in a sharp decline in the cable insulation and mechanical properties, and eventually lead to the breakdown of the cable insulation

Method used

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  • Watertight power cable and processing technology thereof
  • Watertight power cable and processing technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Such as figure 1 As shown, the water-blocking power cable includes three wire cores twisted into a cable, and each of the wire cores includes a conductor 2, a conductor shielding layer 3, a conductor insulating layer 4, an insulating shielding layer 5, and a copper tape from the inside to the outside. Shielding layer 6, the cable core 1 of the three wire cores twisted into a cable includes an inner sheath 8, an armored layer 9, a water-blocking tape 10 and an outer sheath 11; the conductor insulation layer 4 is EPDM insulation Rubber, EPDM rubber is non-polar in nature, has low water absorption, and has good insulation properties; between the cable core 1 and the inner sheath 8, the filling layer 7 is squeezed and filled, and the filling layer 7 is non-vulcanized Plasticine, non-vulcanized plasticine completely fills the gap between the cable cores and the inner sheath, which improves the radial and longitudinal water blocking effects of the cable. At the same time, due...

Embodiment 2

[0018] Such as figure 2 As shown, the processing technology for preparing the water-blocking power cable of Example 1 includes the following process steps: (1) conductor wire drawing: the metal material is drawn and annealed to obtain a conductor monofilament; (2) conductor stranding: multiple (3) Co-extrusion of conductor shielding layer, conductor insulation layer and insulation shielding layer: the conductor shielding layer, conductor insulation layer and insulation shielding layer are co-extruded outside the conductor; (4) Copper Shielding: Wrap the copper tape around the insulating shielding layer to prevent the copper tape from scratching the insulating shielding layer; (5) Cabling: Twisting three wire cores into a cable core; (6) Extruding non-vulcanized plasticine and filling Co-extrusion of the sheath: it is realized by the front and rear 1+1 co-extrusion method, that is, the cable core after being cabled will be squeezed and filled with non-vulcanized plasticine bet...

Embodiment 3

[0021] Such as figure 2 As shown, the processing technology for preparing the water-blocking power cable of Example 1 includes the following process steps: (1) conductor wire drawing: the metal material is drawn and annealed to obtain a conductor monofilament; (2) conductor stranding: multiple (3) Co-extrusion of conductor shielding layer, conductor insulation layer and insulation shielding layer: the conductor shielding layer, conductor insulation layer and insulation shielding layer are co-extruded outside the conductor; (4) Copper Shielding: Wrap the copper tape around the insulating shielding layer to prevent the copper tape from scratching the insulating shielding layer; (5) Cabling: Twisting three wire cores into a cable core; (6) Extruding non-vulcanized plasticine and filling Co-extrusion of the sheath: it is realized by the front and rear 1+1 co-extrusion method, that is, the cable core after being cabled will be squeezed and filled with non-vulcanized plasticine bet...

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Abstract

The invention discloses a watertight power cable and a processing technology thereof. The watertight power cable has the advantages that a conductor insulating layer is made of EPDM (Ethylene-Propylene-Diene Monomer) rubber; since the EPDM rubber has hydrophobicity per se, the formation of a water tree is foundationally eliminated, and the watertight effect of the cable in the radial direction and the axial direction is ensured; a filling material between cable cores is soft unvulcanized rubber with good plasticity to completely fill gaps between the cable cores of the cable and an inner sheath, so that the watertight effect of the cable in the radial direction and the axial direction is ensured; in the meantime, the filled cable has good softness, is conductive to layout construction, ensures that the cable can stably operate for a long time in a working environment with high humidity, and foundationally prevents the insulation performance of the cable from being damaged by water; differing from a conventional working procedure in which cabling and filling of a watertight power cable are finished at one time, gaps between the cable cores and gaps between the cable cores and the inner sheath are extruded and filled by adopting unvulcanized plasticine, so that the cable core forming is facilitated, the favorable filling effect between the cable cores and between the cable cores and the inner sheath layer is ensured, and the watertight effect of a cable finished product is greatly improved.

Description

Technical field: [0001] The invention relates to a cable and its processing technology, in particular to a water-blocking power cable and its processing technology. Background technique: [0002] In humid areas with high groundwater level and perennial rain, it is better to use water-resistant power cables for buried cables. If ordinary power cables are used, moisture will easily penetrate into the cable or enter the cable from the damaged sheath, which will eventually cause cable accidents. . [0003] Ordinary water-blocking power cables operate in a humid environment for a long time. Moisture is also easy to infiltrate from the damaged parts that are damaged by mechanical stress or external force during laying and operation. The moisture that penetrates into the cable insulation will increase under the action of the electric field. The probability of forming water trees, a large number of water trees will cause a sharp decline in the insulation and mechanical properties o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B9/02H01B7/02H01B7/282H01B7/285H01B13/24
Inventor 王怀山刘钢李义东李永在
Owner INNER MONGOLIA RENDA SPECIAL CABLE