Direct current cable for subway

Abstract

The invention relates to a direct current cable for subway, which comprises a conductor, wherein the conductor adopts tin-plating copper wires; the strand is stranded by a plurality of tin-plating copper wires; water blocking yarns are clamped among the tin-plating copper wires; a power wire core is stranded by a plurality of strands horizontally coated with double-surface semi-conductive water blocking tapes and is coated with two layers of double-surface semi-conductive water blocking tapes outside which polyester film tapes are coated; the polyester film tapes is coated with 105 DEG C heat-resistant, high-strength and flame-retardant ethylene propylene terpolymer rubber outside which an expansion type semi-conductive water resistance tape is coated; aluminum plastic composite tapes are arranged outside the expansion type semi-conductive water resistance tapes and are overlapped, horizontally coated and welded in a lapping way; a high flame retardant oxygen-blocking layer is extruded and coated between the aluminum plastic composite tapes and a polyethylene inner sheath, wherein the high flame retardant oxygen-blocking layer is filled with a great amount of organic flame retardants, such as metal hydroxides of aluminum hydroxide, magnesium hydroxide and the like; a ratproof, termiteproof, ultraviolet-resistant, low-smoke, halogen-free and high flame retardant type polyolefine sheath is arranged outside the polyethylene inner sheath. The invention can be completely used under bad geological conditions.

Description

technical field [0001] The invention relates to a cable, in particular to a DC cable for subways. Background technique [0002] With the steady development of my country's economy, urban rail transit is entering a stage of steady, orderly and rapid development. Cities that have opened urban rail transit in the country include Beijing, Shanghai, Tianjin, Guangzhou, Changchun, Dalian, Chongqing, Wuhan, Shenzhen, Nanjing, etc. Measured according to the three indicators approved by the State Council for subway construction (that is, the urban population is more than 3 million, the GDP is more than 100 billion yuan, and the general budget revenue of local finance is more than 10 billion yuan). needs and conditions. Judging from the urban rail transit plans approved and about to be approved by the State Council, more than 20 cities are involved. According to statistics from the National Development and Reform Commission, during the "Eleventh Five-Year Plan" period, China's urba...

AI Technical Summary

Problems solved by technology

But it does not take into account the longitudinal water resistance of the conductor

Images