Split-phase lead-coated submarine cable

Abstract

The invention discloses a split-phase lead-coated submarine cable. The split-phase lead-coated submarine cable is characterized in that: a split-phase lead coating is arranged outside a water-blocking buffer layer (5); the split-phase lead coating comprises a metal shielding layer (10); a split-phase sheath (61) is arranged outside the metal shielding layer (10); and an anti-corrosion reinforcing layer (91) is arranged between a winding belt (9) and a liner layer (11). According to different occasions and customer requirements, the invention provides different insulation types of submarine cables, such as cross-linked polyethylene (XLPE) insulating submarine cables which meet general requirements, ethylene propylene rubber (EPR) insulating submarine cables which are bendable and high in anti-aging performance, and thio-rubber (TR)-XLPE insulating submarine cables which are high in waterproof performance and anti-aging performance, low in loss and large in transmission capacity.

Description

technical field [0001] The invention relates to a three-core 6-1100kV submarine cable, in particular to a three-core 6-1100kV phase-splitting lead-clad submarine cable. Background technique [0002] The wire and cable industry is an important supporting industry for the two pillar industries of the national economy, electric power and communications, and plays an extremely important role in the national economy. The important role of energy and information transmission is the "vessel" and "nerve" of the national economy. [0003] Thousands of kilometers of submarine cables and pipelines are laid every year in China, and submarine cables account for about 10% to 15% of the total laying volume. With the rapid development of the national economy and the continuous development of island construction and island development, deep-sea energy exploitation, the domestic demand for submarine cables has increased significantly. Ordinary submarine cables can only be used in water dept...

AI Technical Summary

Problems solved by technology

If it is used in deep sea, its waterproof and aging performance will be poor, which will affect the life of the cable

[0007] 2. The electrical connection is not well taken into account. The metal shield is covered with an insulating phase-splitting sheath or the metal shield is placed outside the wrapping tape.

Insulated phase-separated sheath is used, and the surface of the sheath is uneven and smooth. When the length of this submarine cable is long, the electrical contact between the three phases is uneven, and the induced potential cannot be completely offset, which will cause the metal layer to heat up, thereby greatly affecting The transmission power of the submarine cable

If the metal shield is placed outside the wrapping tape, the electric fields between the three phases will superimpose on each other, which will damage the insulation and reduce the life of the cable. The length of a single cable is relatively short, and the maintenance (joint) operation is complicated.

[0008] 3. The optical cable unit of the submarine cable is set in the gap of the power cable, and although there are fillers around it and the power cable, it cannot be fixed well. The optical cable unit of this structure is not well protected. prone to breakage during fabrication and laying

[0009] 4. Some ship bugs and microorganisms in the ocean will corrode the cable core of the submarine cable, and even the metal shielding and insulation

[0010] 5. The traditional outer covering layer is made of fiber material of the same color, which is not easy to identify when laid in the ocean, which is not conducive to protection and maintenance

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