Feasibility study of compact high-T/sub c/ superconducting cables

A statistical technique for the investigation of weak points and degradation of high-temperature superconductor tapes

“…A lower percentile of J C was chosen, however, as the reference for the planned investigations, i.e. 5% of the cumulative probability, I C (5), which can be calculated from α and β from the following expression:…”

“…The parameters α, β, I C (5), and W 2 were used to analyse the behaviour of the specimens under the previously described kinds of stresses. However, I CC evaluated with the critical field method (E C = 1 µV cm −1 ) was also considered to compare the proposed methodology with the conventional approach, based on the detection of I CC .…”

“…Realization of superconducting cables could provide a solution for ac or dc energy transport taking into account energy-saving and environmental aspects [5][6][7][8]. The feasibility of high-power cables now seems a possible target, owing to the recent improvements (as regards critical current density and mechanical strength) of superconducting tape performance.…”

Conceptual design of 275kV class high-Tc superconducting cable

“…The reason is that the outer diameter of HTS cable is the most compact at cable voltage of 66 kV-110 kV when we calculate a cable diameter from the voltage and the transmission capacity as parameters under a predetermined transmission capacity of 350-500 MVA [1,2]. In addition, we can install the compact HTS cable into a cable duct with 150 mm inner diameter, which is widely used in Japan [3].…”

A dc transmission cable prototype using high-temperature superconductors

“…All these programmes are aiming at roughly the same technical requirements in, for example, a short ac underground link (<500 m) with a conductor critical current density (J c ) of 1 × 10 9 A m −2 , ac losses below 1 W m −1 and operating at or just below 77 K. The leading candidate material for the above is the ceramic (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O 10 , thermomechanically processed in a silver tube via the powder-in-tube technique [13]. The intense effort in developing this material for ac cable applications has led to state-of-the-art tapes over 500 m long with J c -values in self-fields of 1 × 10 8 A m −2 at 77 K [14], with J c increasing rapidly below 60 K. The economic justification for developing such cables comes from the severe congestion in the existing underground power ducts in the Tokyo area [15], and the savings proposed from the retro-fitting of pipe-type cables in the US [16]. The situation for Europe is less clear, with neither the population density problem of Japan or the pipe-type cables common in the US.…”