Double-layer sheath of a flexible DC land cable
A double-layer sheath, flexible DC technology, applied in the direction of insulated cables, flexible cables, power cables with shielding layer/conductive layer, etc. It is difficult to solve the problems of moisture resistance and flame retardancy, and achieve the effect of good interface between layers, good flame retardancy and good overall performance
Active Publication Date: 2018-03-02
STATE GRID CORP OF CHINA +3
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Problems solved by technology
[0004] The flame-retardant polyethylene material introduces an additive flame retardant into the polyethylene matrix material by physical blending to play a flame-retardant role. The doped polyethylene material has good flame-retardant properties, but due to the introduction of a large amount of additives The mechanical properties and water and moisture resistance of polyethylene are greatly affected, so it is difficult for a single-layer flame-retardant polyethylene sheath to have good moisture-proof and flame-retardant properties at the same time
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[0020] Example: In Xiamen ±320kV Flexible DC Transmission Technology Demonstration Project, ±320kV 1800mm 2 Polarized cable and ±10kV 1600mm 2 The double-layer sheath of the flexible DC land cable of the present invention is used in the production and processing of the return cable. After the production of the wrinkled aluminum sheath of the DC cable is completed, the co-extrusion of the double-layer sheath is used to simultaneously complete the ±320kV 1800mm 2 Polar cables are produced with a medium-density polyethylene sheath with a thickness of 2.5mm and a flame-retardant polyethylene sheath with a thickness of 2.5mm, and ±10kV1600mm 2 Polar cables are produced with a medium density polyethylene sheath with a thickness of 2.0mm and a flame-retardant polyethylene sheath with a thickness of 2.0mm. After the production is completed, the DC cable not only has good flame-retardant performance, but also has water-resistance performance to ensure external insulation. Long-term st...
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Abstract
The invention relates to a flexible DC land cable double layer sheath which is characterized by comprising cable water-resistant conductors, a conductor shielding layer, an insulating layer, an insulating shielding layer, a water-resistant buffer layer, a metal sheath, an internal layer waterproof external sheath and an external layer flame-retardant external sheath. Multiple cable water-resistant conductors are externally provided with the conductor shielding layer. The external side of the conductor shielding layer is provided with the insulating layer, the insulating shielding layer, the water-resistant buffer layer and the metal sheath which are arranged from inside to outside in turn. The external part of the metal sheath is provided with the internal layer waterproof external sheath which is also externally provided with the external layer flame-retardant external sheath. A double layer sheath structure is formed by the internal layer waterproof external sheath and the external layer flame-retardant external sheath. The flexible DC land cable double layer sheath is safe and reliable in operation and can meet the related specifications and requirements so that the flexible DC land cable double layer sheath can be widely applied to cable application occasions of humid environment and high flame retardation requirement.
Description
technical field [0001] The invention relates to a cable sheath, in particular to a double-layer sheath of a flexible DC land cable used in the field of high-voltage cable power transmission. Background technique [0002] High-voltage cables are often laid in subsea tunnels or tunnels with rich groundwater. Due to the fact that the tunnel has serious water seepage and high humidity, and in some extreme conditions, it is necessary to consider that there may be a large amount of water ingress in some sections during the operation of the cable. Therefore, when selecting the outer sheath of the cable, it is usually necessary to consider the use of an insulating outer sheath with better water resistance. At the same time, based on the requirements of fire prevention in the tunnel, the outer sheath of the cable needs to have excellent flame retardancy. [0003] Currently commonly used cable extrusion outer sheath materials include polyethylene (PE) and polyvinyl chloride (PVC). Th...
Claims
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IPC IPC(8): H01B7/17H01B7/295H01B7/282H01B7/04H01B9/02
CPCY02A30/14
Inventor 王赞常浩潘尔生马为民石岩乐波梅念陈东赖清平吴方劼付颖杜晓磊李庆先王日恒章婉彤李碧青张倩倩张建民胡明张洪亮
Owner STATE GRID CORP OF CHINA