RE: tecc31 Aug 2022 12:20
Gazzleberry retact that both..
submarine power cable is a major transmission cable for carrying electric power below the surface of the water. These are called "submarine" because they usually carry electric power beneath salt water (arms of the ocean, seas, straits, etc.) but it is also possible to use submarine power cables beneath fresh water (large lakes and rivers). Examples of the latter exist that connect the mainland with large islands in the St. Lawrence River. The purpose of submarine power cables is to transport electric current at high voltage. The electric core is a concentric assembly of inner conductor, electric insulation and protective layers. The conductor is made from copper or aluminum wires, the latter material having a small but increasing market share. Conductor sizes = 1200 mm2 are most common, but sizes = 2400 mm2 have been made occasionally. For voltages = 12 kV the conductors are round. Three different types of electric insulation around the conductor are mainly used today. Cross-linked polyethylene (XLPE) is used for voltages up to 420 kV. It is produced by extrusion in insulation thickness of up to about 30 mm. 36 kV class cables have only 5.5 – 8 mm insulation thickness. The entire cable core is impregnated with a low-viscosity insulation fluid (mineral oil or synthetic). A central oil channel in the conductor facilitates oil flow when the cable gets warm but this is rarely used in submarine cables due to oil pollution risk at cable damage