Preliminary Tests of Subscale and Full-Scale Single-Phase Sections of a 3400-MVA Superconducting Transmission Line
This study, part of a superconducting power transmission lines evaluation, has concentrated on the development of the rigid coaxial system [1–7], illustrated schematically in Fig. 1, in which pressurized helium at a temperature of approximately 4.7 K serves as both the coolant and the electrical insulation. Each phase of this three-phase cable consists of a tubular niobium-copper-invar tricomposite conductor mounted coaxially with electrically insulating spacers within a tubular niobium-copper-invar tricomposite shield. Niobium was chosen as the superconductor because of its low ac losses and low cost as compared with most superconducting alloys and compounds. The niobium is on the outside of the conductor and on the inside of the shields so that the magnetic flux is confined to the space between the two niobium layers and no magnetic flux is coupled to any normal metals. The copper layer between the niobium and the Invar has been included to fully stabilize the niobium in order to ensure that this cable system can continue to deliver power both during and following a through fault . The Invar was chosen in order to minimize the thermal contraction of the conductors and shields when the cable system is cooled from ambient temperature to its operating temperature .
KeywordsOuter Wall None None Dielectric System Eddy Current Loss Cable System
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