Reliable waterproof shielding layer for power cable
A technology for power cables and shielding layers is applied in the field of water-blocking shielding layers for reliable power cables.
Inactive Publication Date: 2014-03-26
WUXI JIANGNAN CABLE
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Problems solved by technology
Although this structure can reduce water infiltration, it cannot solve the problem of water blocking in the longitudinal direction. During the wrapping process, due to the existence of torsional force, traction force, tension, etc. The conductive resistance water wrapping layer will be tight and will not completely fill the gaps between the copper wires; and the longitudinal wrapping single-side plastic-coated metal composite tape requires separate processing equipment, which also increases the production process
Method used
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Embodiment Construction
[0017] The present invention will be further described below in conjunction with accompanying drawing.
[0018] The structure of the single-layer annealed copper wire water-blocking shielding layer is as follows: figure 1 As shown, it includes a layer of loosely wound annealed copper wires 3 , and water-blocking yarn bundles 4 are filled between two adjacent annealed copper wires 3 . The sparsely wound shielded copper wire is wrapped with a water-blocking tape 2 braided with copper wire and water-blocking yarn. Wherein, the diameter of the water-blocking yarn bundle 4 is greater than 10% of the diameter of the copper wire.
[0019] The sparsely wound annealed copper wire 3 is longitudinally covered with a metal armor layer 5 . The metal armor layer 5 is double-sided plastic-coated aluminum-plastic composite tape.
[0020] The structure of the double-layer annealed copper wire water-blocking shielding layer is as follows: figure 2 As shown, a layer of annealed copper wire ...
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The invention provides a reliable waterproof shielding layer for a power cable. The reliable waterproof shielding layer comprises at least one layer of sparsely-wound annealed copper wires, and the space between every two adjacent annealed copper wires is filled with at least one waterproof rope or waterproof yarn bundle. Waterproof tapes formed by copper wires and waterproof yarns in a woven mode are wrapped inside and outside the sparsely-wound annealed copper wires. The diameter of each waterproof rope or waterproof yarn bundle is equal to that of each copper wire or is 5%-15% greater than that of each copper wire. A metal armouring layer is longitudinally wrapped outside the sparsely-wound annealed copper wires and is better an aluminum and plastic composite belt with double faces coated with plastic. According to the reliable waterproof shielding layer, at least one waterproof rope or waterproof yarn bundle is arranged between every two adjacent annealed copper wires, the waterproof ropes or waterproof yarn bundles and the annealed copper wires are wound together in a stranded mode, the space between the copper wires can be filled with the soft waterproof ropes or waterproof yarn bundles, waterproof continuity, evenness and reliability are achieved, water can be effectively prevented from invading in the longitudinal direction of a conductor, and service life of the cable and reliability of power operation are guaranteed.
Description
technical field [0001] The invention relates to the field of power cables, in particular to a water-blocking shielding layer for reliable power cables. Background technique [0002] Moisture intrusion is often the main reason why power cables, especially medium and high voltage power cables, are damaged and their service life is affected. The way of water intrusion is mainly to invade the cable from the cable sheath and the end of the cable, causing oxidation and corrosion of the conductor, thereby affecting the electrical performance of the cable, and even abnormal disconnection accidents; , the insulating layer will produce "water branches", which will accelerate the electrical aging of the cable, cause cable breakdown accidents, and reduce the service life of the cable; moisture will penetrate into the metal shielding layer [0003] In power cables, metal shielding is an essential structure, rated voltage U 0 1kV and above cables should have a metal shielding layer....
Claims
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IPC IPC(8): H01B9/02H01B7/282H01B7/285
CPCY02A30/14
Inventor 刘军马壮刘阿金张文敏陈晓军
Owner WUXI JIANGNAN CABLE