Double-volume medium-voltage cable

Abstract

The invention relates to a double-volume medium-voltage cable which comprises an inner support interlocking tube (1) and a conductive insulated wire core, an inner protective layer (10), an armor layer (11) and an outer protective layer (12) which are sequentially lapped on the periphery of the inner support interlocking tube (1). The inner interlocking tube (1) is of an aluminum or steel interlocking sleeve; the conductive insulated wire core sequentially comprises a lead, a lead shielding layer (4) and an insulting layer (5) from inside to outside. Under the same level condition, carrying capacity can be increased by 20%-30%; under the same cross section condition, 10%-20% of a conductor can be saved; double-volume medium-voltage cable has fire retardant and environmental performance.

Description

technical field [0001] The invention belongs to the field of electric cables, and in particular relates to a double-capacity medium-voltage electric cable, which is suitable for power transmission in large, medium, and short distances and in other important public places. Background technique [0002] Medium-voltage cables, with a rated voltage of 6-35KV, are mainly used for power system transmission and distribution of electric energy fixed laying lines, used in densely populated electrified subways, stations, ports, sports center squares, high-rise buildings, computer information centers, modern Large shopping malls and other important social public places. It has a series of advantages, such as: excellent electrical properties and mechanical and physical properties; excellent low-smoke and halogen-free Class A flame retardancy; low smoke generation, small halogen acid gas release, fire spread and harmful gases to people and Biological poisoning. [0003] Conventional me...

AI Technical Summary

Problems solved by technology

[0003] Conventional medium-voltage cables, especially medium-voltage cables with large cross-sections, according to the skin effect theory, the current in the conductor tends to flow toward the surface, and the closer to the center, the smaller the current. Reasonable utilization results in a waste of copper. The double-capacity medium-voltage cable designed in this paper is based on this theory and is designed in practice. There are research institutions abroad who are also developing this type of product, but most of them are from Functional considerations, such as realizing heating, improving shielding effect, etc., but not considering how to increase the current carrying capacity of the product, save copper, etc.

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