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Brief Analysis of the Classification of Submarine Cables
Submarine cable classification:
1. Impregnated paper cable
It is suitable for the line of not more than 45kV alternating current and not more than 400kV direct current. Currently it is only installed in waters with water depths of less than 500m.
2. Self-contained oil-filled cable
Suitable for DC or AC lines up to 750kV. Because the cable is oil-filled, it can be laid without difficulty in a water depth of 500m.
3. Squeeze Insulation (Crosslinked Polyethylene Insulation, Ethylene Propylene Rubber Insulation) Cables
Suitable for up to 200kV AC voltage. Ethylene-propylene rubber is more effective than polyethylene in preventing branching and local leakage, allowing the submarine cable to function more effectively.
4. "Hydraulic" tube cable
This is only applicable to cable systems of several kilometers in length, because very long cables must be pulled into the pipes, subject to very large mechanical restrictions.
5. Inflatable (pressure assist) cable
Inflatable cables using impregnated paper bags are more suitable for longer submarine cable networks than oil-filled cables, but due to the need to use high-pressure operations in deep water, this increases the difficulty of designing cables and their accessories, generally limited to a depth of 300m. Within.
Submarine cable types:
Submarine communications cables and submarine power cables. Submarine communications cables are mainly used for communications services and are expensive, but they are highly confidential. Submarine power cables are mainly used for underwater transmission of high-power electrical energy, which is equivalent to the role of underground power cables, except that the applications and laying methods are different. Since the submarine cable project is recognized as a complex and difficult large-scale project by countries around the world, complex technologies have been applied in environmental detection, marine physics surveys, and the design, manufacture, and installation of cables. As a result, there are few manufacturers of submarine cables in the world. Mainly in Norway, Denmark, Japan, Canada, the United States, Britain, France, Italy and other countries, in addition to manufacturing these countries also provide laying technology. At present, China's submarine power cables still need to be imported.