Power cables for power sources, especially superconducting power cables. Using barium - copper - oxygen system plus niobium and titanium alloy conductor, the processing process steps are: production of alloy wire - stranding - forming - plating insulation film - vacuum - cable - three times coating - jacket - microcomputer detection - printing label - rewound disc - head - packaging - inspection - qualification report - factory. The take-away and pay-off process adopts the over-end take-away process. The aluminum cladding of superconducting power cable is made of corrugated pipe made of titanium alloy material. Superconducting cables can be processed for hundreds of miles, the power system allows a long period of overload, and the amount of cable interception is independent of laying conditions such as soil. The superconducting cable is made of liquid nitrogen gasification alloy material without resistance, and the electric loss is 0. Superconducting cable's current transfer capacity is 5-7 times that of conventional cable.
The main difficulty in the development of high temperature superconducting cables lies in how to make the brittle high temperature superconducting materials into cable conductors. The alloy conductors of the barium - copper - oxygen system plus niobium and titanium of the invention are pressed into a silver tube by cold isobaric method, processed into wires by extrusion and drawing method, and 55 pieces are bundled together and then stretched and rolled into a band with a thickness of 0.25mm and a width of 3.5mm. After intermediate annealing and periodic thermal mechanical processing, the alloy conductor has a special structure and organization, and the cable conductor is made by using a microcomputer controlled wiring machine. The conductor is composed of several layers of high temperature superconducting belts wrapped in a spiral shape on the soft skeleton, and the adjacent two layers of high temperature superconducting belts are wound in the opposite direction, and the layers are separated by insulation to avoid current coupling. The superconducting cable insulating medium of the invention has two design schemes: Low temperature media and room temperature media, such as the use of low temperature media scheme, there is a layer of electrical insulation and a total insulation layer on each phase or the entire three phases, in the low temperature design of the insulating medium must work at liquid nitrogen temperature, increasing the complexity of the manufacture of cables. In the room temperature dielectric design, thermal insulation is added to the multiple strands of high temperature superconductors, followed by ordinary electrical insulation, shielding and shielding, in addition to the conductor with high temperature superconductors and thermal insulation, the room temperature dielectric design is almost the same as the design of ordinary power cables. The superconducting cable of the invention can be made into a three-core co-sheathed cable and a single-core cable.
