Patent ID: 8623787
Filing Date: 2014-01-07
Classification: H01B,Y02E,Y10T

Abstract:
1. A method of manufacturing a superconductive single-phase or multi-phase cable system comprising the steps of a) providing at least two electrical conductors in the form of at least one electrical phase conductor and a neutral conductor, b) providing that said electrical conductors are mutually electrically insulated from each other in a cable, c) providing a tubular thermal insulation surrounding the electrical conductors, said tubular thermal insulation defining a central longitudinal axis, d) providing that the inner surface of said tubular thermal insulation forms the radial limitation of a cooling chamber for holding a cooling fluid for cooling said electrical conductors, and e) providing that said at least one electrical phase conductor and neutral conductor are arranged eccentrically relative to said central longitudinal axis, the method further comprising, during installation of the cable inside the tubular thermal insulation by introducing an over-length of the cable with respect to the tubular thermal insulation, two or more of the following steps S1-S10: S1. Apply a tensile stress on the tubular thermal insulation thereby stretching it; S2. Cool the cable to liquid N S3. Pressurize the tubular thermal insulation to at least 3 bars so as to cause an elongation of the inner wall of the tubular thermal insulation; S4. Push the cable into the tubular thermal insulation; S5. Force the tubular thermal insulation to meander or bend in multiple locations through bending it and fixing it to the ground; S6. Fix the cable ends at the ends of the tubular thermal insulation; S7. Subsequently release the pressure of the tubular thermal insulation; S8. Subsequently release the tensile stress on the tubular thermal insulation; S9. Subsequently allow the cable to warm up, the cable expanding on heating; S10. Subsequently stop pushing the cable into the tubular thermal insulation.