Enameled wire stranded conductor suitable for AC high-voltage cable and sea cable

Abstract

The invention provides an enameled wire stranded conductor suitable for an AC high-voltage cable and a sea cable. The enameled wire stranded conductor is formed by 3 to 6 layers of conductor layers. The conductor layers are formed by the alternate enameled conductor layers and bare conductor layers, and an outer conductor layer is a bare conductor layer. Compared with the prior art, the enameled wire stranded conductor has the advantages that the enameled wire stranded conductor suitable for an AC high-voltage cable and a sea cable is provided and is suitable for a large section conductor structure design, a skin effect is significantly reduced, raw materials are saved, the water-proof effect is good, the stability is high, and the enameled wire stranded conductor has a good development prospect.

Description

technical field [0001] The invention belongs to the field of cables, and in particular relates to an enamelled wire stranded conductor suitable for AC high-voltage cables and submarine cables. Background technique [0002] When there is alternating current or alternating electromagnetic field in the power cable conductor, the current distribution inside the conductor is uneven, and the current is concentrated in the "skin" part of the conductor, that is to say, the current is concentrated in the thin layer on the outside of the conductor. The closer to the surface of the conductor, the higher the current density. The larger the , the actual current inside the wire is smaller, which results in an increase in the resistance of the conductor and an increase in its power loss. This phenomenon is called the skin effect, also known as the skin effect. [0003] The skin effect will increase the effective resistance of the conductor. When the low-frequency current flows through a t...

AI Technical Summary

Problems solved by technology

Because AC submarine cables need to take conductor water-blocking measures, effective measures cannot be taken to reduce the skin effect when the cable conductor cross-section is large. The maximum AC resistance can reach 160% of the DC resistance, resulting in large operating losses for large-section submarine cables.

[0005] In order to reduce the skin effect of the existing AC power cable conductor, if the cross section is greater than 800mm 2 At present, the technology of dividing the conductor is often adopted, and the conductor is divided into several fan-shaped conductor blocks of equal area, and the cable insulation paper is used to isolate each block, which mainly increases the equivalent surface area of ​​the conductor and reduces the effect of the skin effect, but the effect is limited. In addition, submarine cable conductors have considerable requirements for longitudinal water resistance, and it is difficult to use split conductors in submarine cable conductors.

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