Novel self-contained oil-filled cable

Abstract

The invention discloses a novel self-contained oil-filled cable. The cross section of the novel self-contained oil-filled cable sequentially comprises a central cable core, a cable core shielding layer, an annular oil duct, an annular wire, a wire shielding layer, an insulating layer, a lining layer, a liner layer, a reinforcing layer and an outer coating layer from inside to outside; and the cable core shielding layer is fixedly attached to the outer surface of the central cable core, an annular oil duct is formed between the cable core shielding layer and the annular wire, the wire shielding layer, the insulating layer, the lining layer, the liner layer, the reinforcing layer and the outer coating layer are sequentially attached, sealed and fixedly connected from inside to outside, and the wire shielding layer is fixedly attached to the surface of the annular wire. On the basis of the existing oil-filled cable, the operating temperature can be reduced so that the current-carrying capacity is improved, and the oil-filled cable is constructed by using a novel structure and a novel material and has the advantages of simple structure and high applicability.

Description

technical field [0001] The invention relates to the technical field of application of new materials, and is a novel self-contained oil-filled cable. Background technique [0002] The structure of high-voltage oil-filled cables mainly includes self-contained oil-filled cables and steel pipe oil-filled cables. Compared with ordinary cables, oil-filled cables have many advantages. Because the cable insulation maintains a certain pressure inside, moisture and air outside It cannot enter the insulating interior from the cable body or accessories. Therefore, as long as the oil pressure of the oil-filled cable is normal, its long-term operation reliability is not a problem, and the service life can reach 40 to 50 years. Cable insulation based on natural mineral oil has high stability in electric field. Even if the oil-filled cable is damaged by external forces and causes oil leakage, or if the sheath is grounded, short-term overload and high temperature and other abnormal phenomen...

AI Technical Summary

Problems solved by technology

[0003] There are many disadvantages in existing oil-filled cables: the insulating oil used in oil-filled cables is a flammable liquid, and ordinary insulating oil has a low flash point (the Min point of low-viscosity oil is generally below 140°C), and it is easy to catch fire; Open flames such as blowtorches should be used. If you are not careful, it will ignite. In addition, if the oil-filled cable line in operation is on fire due to external reasons or the explosion of the cable head, the "flammability" of the cable will cause serious damage. the fire

Secondly, the freezing point and pour point of ordinary oil-filled cables are relatively high. In winter in northern my country, the lowest temperature can reach -50°C, which poses a considerable safety hazard to the normal operation of the power system. Therefore, it is necessary to study oil-filled cables in depth. The material and structure of the cable are used to improve the normal operation of the cable, improve the stability of the power system, and prevent accidents

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