Heat-resistant shielded power cable for nuclear power stations

Abstract

A heat-resistant shielded power cable for nuclear power stations comprises a combined cable core, three power cable cores are stranded to form the combined cable core, filler is arranged on the combined cable core, the periphery of the filler is sequentially wrapped by an isolating layer, a composite shielding layer, a flame-retardant tape, an oxygen barrier and an outer sheath, the filler is a low-smoke halogen-free flame-retardant polyolefin material, a polyester film is lapped to form the isolating layer, tinned copper wires are woven and lapped to form the inner layer of the composite shielding layer, an aluminium-plastic composite tape is overlapped to form the outer layer of the composite shielding layer, a glass fiber tape is lapped to form the flame-retardant tape, irradiation cross-linked low-smoke halogen-free flame-retardant polyethylene is extruded to form the wrapping oxygen barrier, and the outer sheath is made of ceramic fire-resistant silicon rubber; the three power cable cores respectively consist of a cable core conductor, an liner layer and an insulating layer which are arranged sequentially from the inside to the outside, wherein a synthetic mica tape is lappedto form the liner layer, and heat-resistant silicon rubber is extruded to form the insulating layer, and is then vulcanized. The heat-resistant shielded power cable has excellent heat resistance, shielding property and electric insulativity.

Description

technical field [0001] The invention relates to cables, in particular to heat-resistant shielding power cables for nuclear power plants. Background technique [0002] As one of the important electrical supporting products of nuclear power plants, nuclear-grade cables are used in harsh environments and have strict safety requirements. They are wire and cable varieties with high performance requirements and difficult manufacturing techniques. For example, the long-term working temperature requirement is 90°C. Due to the existence of high-order harmonic interference in the frequency conversion circuit, this interference will affect the electrical and control systems of adjacent distribution lines through wires and cables, and bring hidden dangers to the normal operation of the entire system. Therefore, the cables used in nuclear power plants must not only meet their own requirements. In addition to heat resistance and fire protection requirements, its electrical shielding perfo...

AI Technical Summary

Problems solved by technology

Due to the existence of high-order harmonic interference in the frequency conversion circuit, this interference will affect the electrical and control systems of adjacent distribution lines through wires and cables, and bring hidden dangers to the normal operation of the entire system. Therefore, the cables used in nuclear power plants must not only meet their own requirements. In addition to heat resistance and fire protection requirements, it is also necessary to improve its electrical shielding performance

[0003] The patent document with the application number CN200720037769.6 discloses a shielded power cable for nuclear power. Although the document proposes that a filler, a flame retardant layer, a shielding layer, and an outer sheath are arranged outside the cable core conductor, it does not point out that each layer Which material to use specifically; the patent document with the application number CN200520075477.2 discloses a metal shielded power cable, the inner and outer protective layers of the cable are high flame-retardant polyolefin, polyolefin oxygen index is high, and the flame retardancy is good , but polyolefin is a high-molecular organic matter, which will become soft and deformed when it encounters an open flame, and it is difficult to meet the requirements of heat-resistant shielding for nuclear power plants

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