750KV ultrahigh pressure cross-linked polyethylene insulated power cable

Abstract

The invention relates to a 750KV ultrahigh pressure cross-linked polyethylene insulated power cable which comprises a conductor, wherein a semiconductive belt is wounded and wraps the conductor to form a semiconductive wrapping layer, semiconductive inner screening materials, insulating materials and semiconductive outer screening materials are arranged on three layers outside the semiconductive wrapping layer in a coextrusion mode to form a conductor screening layer, an insulating layer and an insulation screening layer, and a longitudinal water blocking buffer layer, a radial water blocking aluminum sheath layer, an asphalt abrasion-proof layer, a nonmetal outer protection layer and a semiconductive coating are wound and wraps the insulation screening layer. The 750KV ultrahigh pressure cross-linked polyethylene insulated power cable is reasonable in structure, at the same time, the insulating materials with high dielectric properties and ultra-clean extra-smooth semiconductive screening materials with special additives added are adopted, accordingly the breakdown field strength of the cable is improved, the defects of the 750KV ultrahigh pressure cross-linked polyethylene insulated power cable are few, the longitudinal water blocking buffer layer and the radial water blocking aluminum sheath layer are arranged, so that humidity and moisture are fundamentally prevented from entering insulation from a cable sheath, and occurrence of a water tree in the cable insulation is avoided.

Description

technical field [0001] The invention relates to a power transmission cable, in particular to a 750KV ultra-high voltage XLPE insulated power cable. Background technique [0002] With the progress of society and the development of economy, human beings are more and more dependent on electric energy, and the demand for electric energy is increasing. However, most countries in the world have the problem of unbalanced distribution of primary energy and productivity. Therefore, the construction of large-capacity and long-distance power grids has been highly valued by governments. In order to reduce the line loss in the process of long-distance power transmission, high-voltage power transmission technology is required. my country is actively developing ultra-high voltage and ultra-high voltage transmission and transformation lines. With the development of ultra-high voltage transmission technology, higher and higher requirements are put forward for power cables, an important part...

AI Technical Summary

Problems solved by technology

However, most countries in the world have the problem of unbalanced distribution of primary energy and productivity. Therefore, the construction of large-capacity and long-distance power grids has been highly valued by governments of all countries.

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