In recent years, with the exhaustion of global fossil energy and the increasing demand for electricity, the world is vigorously developing new energy industry, and the development of new energy in the field of ocean is more countries scramble to do, such as offshore wind power generation, ocean tidal energy, offshore natural gas and oil exploration, and for offshore new energy. There is only one channel for land use, that is, marine cable.

The submarine cable must consider the actual application of the project when it is manufactured because of the need to complete the power transmission in the sea.

The construction of submarine cable project is limited by the region, ocean engineering, construction equipment and other conditions. The project involves a wide range of technical fields, large investment scale and complex construction technology. Construction period can be generally divided into two stages, the pre-construction work mainly involves engineering design, submarine cable routing, submarine cable manufacturing and transportation, the project construction period mainly includes submarine cable routing and positioning, submarine cable laying, submarine cable protection, land equipment installation, testing and commissioning, engineering acceptance. The main points are as follows:

Large length. Because the condition of the submarine cable is complex in transportation and laying, it is necessary to produce as long as possible in manufacturing. General rubber flexible cable sea cable transport is tens of kilometers or even hundreds of kilometers at a time, sea optical cable is thousands of kilometers, there is no conditions to transport section by section at sea; large length also brings manufacturing stability, consistency requirements are very high, thus the requirements for equipment are very high; in addition, large length of submarine power cable We should also consider whether the technology of cable intermediate joint is reliable or not.

The uniqueness of production and transportation. In production, such as the use of lead, the extrusion of lead must be continuous for more than ten days without stopping the machine to achieve, adding lead is easy to submerge the submarine cable faster; ordinary power cable steel strip armor after extrusion sheath, submarine cable sheath outside a layer of covered and mixed with asphalt steel wire sheath used to increase the laying. Mechanical strength and corrosion resistance at the time of installation; In transportation, the enterprise must also be equipped with tower, wharf and other hardware facilities, transportation process also to avoid riveting cable and other accidents.

The system is strong and the cycle is long. The submarine cable system is very strong, and it is not only easy to complete cable manufacturing. It is necessary to survey the sea condition in the early stage. If it is a general contract, it is necessary to give the overall design plan, as well as the choice of cable type, various joints including accessories, etc. Even in the manufacturing process, the actual laying conditions should be taken into account. Seasonal construction of submarine cables is very strong. During the year, the construction of marine medium voltage power cables in different sea areas exists window period. So the submarine cable is not only a matter of cable manufacturing, is a system engineering; 2, a complete submarine cable project cycle is very long, from project approval to the enterprise to get orders, in the communication with the owner link, you need to explain your design, manufacturing capacity, certification, submarine cable transport construction and other specific links. Chu, these communications sometimes take months.