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[en] A technique has been developed for the braiding of large numbers of superconducting wires into fully transposed, rectangular cross section conductors of low aspect ratio. The technique is derived from textile industry lattice braiding used to manufacture square cross section braids which are not, however, fully transposed. The void structure of the lattice braid cross section is superior, for axial forced flow cooling, to folded flat braids and to triplex cables. The lattice braided conductor also has an effective transposition length which is much shorter than its actual transposition length; because of the geometry of the wire path through the cross section, axial magnetic field coupling is cancelled out over lengths which can be only fractions of the actual transposition length. A prototype braid sample has been fabricated from insulated superconducting wire which exhibits the advantages expected. Application of this type of conductor to large force-cooled and/or pulsed coils is discussed. 3 refs

[en] The necessity of designing the very best possible thermal insulation for superconducting cables is discussed. Results of an investigation on the use of multi-layer insulation with high vacuum between the thermal shield and sc cable core envelope are reported. The results show that by the simple precaution of not allowing the inner surface of the multi-layer insulation to touch the lower temperature wall a large improvement on the thermal characteristics of the thermal insulation for an sc cable is made. By this method a sufficient reduction in the heat inleak value for sc cables can be achieved. (U.K.)

[en] Vacuum insulation, as compared with solid insulation, simplifies the construction of both resistive or superconducting cryogenic cables. The common vacuum space in the cable can furnish thermal insulation between the environment and the cryogenic coolant, provide electrical insulation between conductors, and establish thermal isolation between go- and return-coolant streams. The differences between solid and vacuum high voltage insulation are discussed, and research on the design, materials selection, and testing of vacuum insulated cryogenic cables is described

[en] In the early 1970's, the devlopment of cryogenic power transmission systems was concentrated on proving technical feasibility. By the mid '70's, the emphasis has changed to the development of systems that meet the technical, economic and operating requirements of the electric utility industry. This paper discusses some of the problems in these areas to which attention must be directed if cryogenic systems are to enter utility service at some time in the near future. (author)

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[en] This standard is applicable to coaxial high voltage connectors on nuclear instruments for dc applications up to 5000 volts and ac applications up to 3500 volts rms at 60 Hz. The connectors may also be used at higher frequencies provided the operating voltage is appropriately reduced