What is a submarine 3-core cable?

ONE. What is a submarine 3-core cable? Modern medium voltage submarine cables (52kV) are usually designed as three-core (3C) cables with XLPE insulation. The cable core is similar to that of an onshore cable. Many different design alternatives are used for this type of submarine cable. Many cable construction layers can be applied to each individual core or to the three common cores. In addition, many different screen/sheath configurations can be found. Depending on the specifications, submarine MV cables can be produced with or without a metallic sheath. The low electrical stress of extruded medium voltage cables allows for cable design without complete water locking. The extruded plastic sheath provides a secure water barrier, while the absorbent inside the plastic sheath handles trace amounts of water vapor that can diffuse through the extruded plastic sheath. Another common system used for waterproofing is aluminum laminate and copper wire mesh. The aluminum laminate forms a radial water barrier, while the copper wire mesh is designed to carry fault currents. The non-metallic sheath of a three-core submarine cable can be made of a semiconductor polymer. The capacitive currents of the three phases can be balanced against each other, which increases the current carrying capacity of the cable. Many different combinations of sheathing, screens and corrosion protection are possible. Manufacturers have their own "know-how" to meet the very different conditions and requirements of submarine power links. High voltage cables are available in 3C design up to 170 kV.

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