Undersea Cable
Undersea Cables are electrical wires wrapped in insulating and waterproof materials and laid underwater on the seabed and rivers to transmit electricity or communications. The insulation material is usually: XLPE/EPR/PE.
ZMS is a specialized submarine power cable company and has been working with underwater cables for many years. Our submarine power cables range from 70mm to 210mm in diameter and are available in both High Voltage Alternating Current (HVAC) and High Voltage Direct Current (HVDC) versions, utilizing state-of-the-art cable design, manufacturing, and installation methods. Our submarine lines offer excellent performance and a guaranteed service life.
ZMS Undersea Cable Details
Up to 35kV XLPE or EPR Insulated Single Core Submarine Cable
Conductor: Cu. Single wire tin-galvanized or not, waterproof materials intermingled during stranding
Conductor screen: Semi-conductive materials extruding layer
Insulation: Xlpe or EPR
Insulation screen: Semi-conductive materials extruding layer
Waterproof layer: Semi-conductive waterproof strip
Metal screen: Copper-tape
Waterproof layer: Semi-conductive waterproof strip
Waterproof sheath: Compound waterproof layer(al.or cu, laminated with pe)
Lapped inner layer: Glued fabric strip and bitumen
Armoring: Seawater-resistant alloy-galvanized steel wire and bitumen
Serving: Steeped fiber ropes
Standard: IEC 60228, IEC 60502, IEC 60840, IEC 62067
35kV Insulated Led-Sheath Waterproof Layer Underwater Cable
Conductor: Cu. single wire tin-galvanized or not, waterproof materials intermingled during stranding
Conductor screen: Semi-conductive materials extruding layer
Insulation: Xlpe or EPR
Insulation screen: Semi-conductive materials extruding lanyer
Waterproof layer: Semi-conductive waterproof strip
Metal screen: Lead sheath
Sheath: PE
Lapped inner layer:Geled fabric and bitumen
Armoring:Seawater-resistant alloy-galvanized steel wire or copper wire
Serving: Steeped fiber ropes
Standard: IEC 60228, IEC 60502, IEC 60840, IEC 62067.
Insulated Compound Al.(Cu.) Waterproof Layer 3 Core Undersea Cable
Conductor: Cu. Single wire tin-galvanized or not, waterproof materials intermingled during stranding
Conductor screen: Semi-conductive materials extruding layer
Insulation: Xlpe or EPR
Insulation screen: Semi-conductive materials extruding layer
Waterproof layer: Semi-conductive waterproof strip
Metal screen: Cu tape
Waterproof sheath:Compound waterproof layer(ai.or cu. Laminated with pe)
Filling;anti-humidity material
Lapped inner layer:Geled fabric and bitumen
Armoring: Seawater-resistant alloy-galvanized steel wire and bitumen
Serving: Steeped fiber ropes
Standard: IEC 60228, IEC 60502, IEC 60840, IEC 62067.
35kV XLPE nsulated Optical Fiber Comprehensive Undersea Cable
Conductor: Cu. single wire tin-galvanized or not, waterproof materials intermingled during stranding
Conductor screen: Semi-conductive materials extruding layer
Insulation:XLPE or EPR
Insulation screen: Semi-conductive material extruding layer
Water-resistant layer: Semi-conductive strip
Metal screen: Cu tape (lead sheath)
Water-resistant layer: Semi-conductive strip
Waterproof sheath: Compound waterproof layer(cu. Or al. Laminated with pe) or lead sheath(extruded led with pe)
Filling: Anti-humidity material
Optical fiber cable: The core no. Can reach 144 with a compound waterproof sheath or lead sheath as a waterproof layer
Lapped inner layer:Geled fabric and bitumen
Armoring: Seawater-resistant alloy-galvanized steel wire and bitumen
Serving: Steeped fiber ropes
Standard: IEC 60228, IEC 60502, IEC 60840, IEC 62067.
110/220kV XLPE Insulated Submarine DC Power Cable
Conductor: Cu. single wire tin-galvanized or not, waterproof materials intermingled during stranding
Conductor screen: Semi-conductive tape and extruded semi-conductive material layer
Insulation: XLPE
Insulation screen; extruded semi-conductive material layer
Water-resistant layer: Semi-conductive water-resistant strip
Metal screen: Lead sheath
Sheath: PE
Lapped inner layer geled fabric and bitumen
Armoring: Seawater-resistant alloy-galvanized steel wire or copper wire
Serving: steeped fiber ropes
Standard: IEC 60228, IEC 60502, IEC 60840, IEC 62067.
Structural Dimensions
Single Core Submarine Power Cable/HYJAY41 HEAY41 8.7/10(12)kV
Three Core Submarine Optical Fiber Comprehensive Cable 8.7/10(12)kV
ZMS has very rich experience in subsea electrical cable production and laying of various large-scale submarine projects. We have worked with transoceanic cable projects with customers in many countries around the world and have been able to outperform many suppliers in delivering quickly. The qualification and quality of submarine cables are widely praised.
Most importantly, ZMS has the experience to customize cables to meet the needs of our project partners in terms of size, type, cross-section, or construction!
More Submarine Power Cable Products
Undersea internet cables can also be divided into submarine communication and power cables according to their uses. Submarine power cable is mainly used for underwater transmission of high-power electricity. It is equivalent to the role of underground power cables, but the difference is the application of the occasion and the way of laying. The purpose of submarine power cables is to transport electric current at high voltage.
HVAC (High Voltage Alternative Current) Submarine Cable
HVDC (High Voltage Direct Current) Submarine Cable
Subsea electrical cables development so far, the structure designed to make a variety of exploration and experimentation, the main structure includes the following types:
- Impregnated Paper-Covered Submarine Cable: Suitable for not more than 45kV AC and not more than 400kV DC lines. At present, it is only installed in a water depth of 500m or less.
- Oil-Filled Subsea Power Cable: Use the method of supplemental impregnant to eliminate the air gap in the cable. When the cable temperature rises, the impregnant expands, the pressure inside the cable increases, and the impregnant flows into the oil supply tank. When the cable cools, the impregnant shrinks, the pressure inside the cable decreases, and the impregnant in the oil supply tank flows into the cable again, preventing the generation of air gaps. So it can be used for 110 kV and above lines. Laying in water depths up to 500m.
- Inflatable (Pressure-Assisted) Submarine Cable: The use of impregnated paper bags of inflatable cable rather than oil-filled cable is more suitable for the longer submarine cable network. But because of the need to operate under deep water using high air pressure, thus increasing the difficulty of designing the cable and its accessories, generally limited to a water depth of 300m.
- Oil Pressure Tube Submarine Cable: Only suitable for several kilometers of the cable system, because the very long cable to pull into the pipe, is subject to great mechanical constraints.
- Extruded Insulation XLPE PVC Cables: Suitable for up to 200kV AC voltage. Ethylene propylene rubber is more resistant to dendritic phenomena and local leakage than polyethylene, making submarine cables function more effectively.
ZMS Submarine Cable Manufacturing Process
The entire manufacturing process of the submarine power cable is the same as the general power cable. The entire manufacturing process of the undersea cable is the same as the general power cable. However, there are special requirements for the mechanical strength and corrosion resistance of the sea cable. And the length of the undersea cable is required to be extended as much as possible.
The following is a brief description of the manufacturing process of impregnated paper cables and extruded insulated submarine cables. Impregnated paper cable is first wrapped with an insulating paper core, followed by vacuum drying, and oil dipping, after completing the conductor core, and then wrapped with lead sheath, which is subject to the process of continuous extrusion.
Extrusion of extremely long cable cores is an extremely important step and must be carried out night and day. The conductor core of the oil-filled cable passes through a siphon transport tube from the storage cylinder to the lead press. The tube is filled with degassing oil, which flows in the opposite direction to the conductor core to isolate the contact between the core and the air.
After the core is covered with lead, it is coiled on a rotating platform (if the cable is oil-filled or inflatable, the appropriate amount of metal reinforcement can be added). Then the underwater cable is covered with a polyethylene sheath (extruded polyethylene sheath is also a continuous operation). And then wrapped with two layers of galvanized steel wire armor, covered with oiled hemp impregnation. In the subsequent production process, the lead sheath and metal strip must be grounded through the polyethylene sheath at the appropriate stage.
Most of the production processes for cross-linked polyethylene cables and ethylene-propylene rubber insulated submarine cables are similar to those for paper-insulated lead-sheathed cables, except for the extrusion and vulcanization of the synthetic rubber insulation. But without the use of a lead sheath.
Prospects Of ZMS Submarine Cables
The complexity of the marine environment of the submarine cable project put forward high requirements, underwater cable engineering is a recognized problem in the world, construction difficulties, and high maintenance costs. And it was only a few companies in the world could lay and commission submarine high-voltage cables. The development of the submarine cable market has been greatly restricted. More issues, but more solutions to the problem. In the future, the application space of subsea power cables will be broader, it is important infrastructure equipment and is an important technical support for human beings to achieve the effective expansion of their activity area. It transports clean ocean energy to the mainland, relieving the tension of mainland resources, and also transports mainland energy to the ocean, contributing to the development of the ocean economy.
ZMS Submarine Cable company firmly believes in this. Therefore, we strictly require ourselves. Managed with high-quality products and after-sales service, ZMS cable has a strong technical force, exquisite technology, advanced production equipment, complete testing means, and advanced enterprise management.
The submarine cable products produced by the ZMS cable factory include submarine power cables, submarine communication cables, submarine fiber optic cables, underwater cables, Internet cables in the ocean, and other products. A variety of new products have been researched and independently judged, taking into account the comprehensive factors of equipment, materials, yield, conversion efficiency, quality and cost, and the need to master the right timing for production. For the mainstream technology direction, the company has reserved for mass production and will launch differentiated products according to the characteristics of different markets. Power transfer from energy sources, including offshore renewable energy schemes, to consumers. Interconnecting different regional electrical transmissions.
In recent years, through independent research and development, the company has been breaking through the length and voltage level of underwater electric cable production and taking the lead in the development of dynamic undersea power cables, towing cables, and other special submarine cables. The production of submarine cable-related products is widely used in marine scientific research and resource development and other fields, to assist in the construction of China’s “Ocean Power” strategy.
