Fluid-cooled high tension cable - having flow of air or water through cavity inside polyamide and polyethylene insulation layers

摘要

A high-tension cable consists of a stranded or hollow conductor inside a plastic tube with a several times greater inside dia. than the outside of the conductor. The coolant (water or air) flows through this cavity. The plastic tube consists of an inner layer of low conductivity and high abrasion resistance, on the basis of polyamide. The following insulating layer is made of polyethylene or similar material. The next layer is an extruded plastic of low conductivity and can be used to apply a braiding of metal wires. The final outer layer insulates the previous layer against earth potential and protects it against mechnical damage. Such a cable can transmit 2000 MVA and more. It is simple to mfr. and to lay, even for sections of over 2000 mm2.