Consideration on the Economy for Superconducting DC Power Transmission

1 to 3 GVA class superconducting power transmission cables with Nb3Sn or oxide superconductor.

“…This E gives inner diameter D2 of shielding conductor as follows: (1) The diameter D 2 , as a function of D 1 , takes a minimum value when D1 is given as Figure 5(b) sh ows that the i nn er diameter D2 of shielding condu c t o r, becomes mi nimum a t a cer t ain r a ted volt age of lower tha n 275 kV, hence th e diamete r of th e cab l e c ore also t a kes the minimum va lu e in th e case of rated capacity r B being less than a few ters D1 and D2 are derived from electric insulation design and surface current density J is proportional to rated current IB which is proportional to rated capacity P B " Therefor e the electric constants depend on P b as XL oc _.…”

“…Several economical estimations have been proposed for superconducting power transmission cables which were designed to be used in extremely large-capacity transmission lines [1][2][3][4]. The conclusions of these estimations showed that economically feasible superconducting cables would be larger than 5 GVA in ac lines or larger than 10 GVA and longer than 100 km in dc lines.…”

1‐ to 3‐GVA class superconducting power transmission cables with Nb3Sn or oxide superconductor

“…This E gives inner diameter D2 of shielding conductor as follows: (1) The diameter D 2 , as a function of D 1 , takes a minimum value when D1 is given as Figure 5(b) sh ows that the i nn er diameter D2 of shielding condu c t o r, becomes mi nimum a t a cer t ain r a ted volt age of lower tha n 275 kV, hence th e diamete r of th e cab l e c ore also t a kes the minimum va lu e in th e case of rated capacity r B being less than a few GVA . For example, chosen rated capacity as GVA , VB between 66 kV and 110 kV, gives most compact cable .…”

Cost analysis of dielectric systems for ac superconducting power transmission line

“…For any of the transmission lines summarized in Table I, redesigning for operation with either a pressurized helium or vacuum dielectric system at an electric stress, Eb, differing from the 200 kV/cm assumed in Table I, wiII change the total capital plus capitalized operating cost, Ct, by an amount ~Ct given by (3) would be fabricated and factory evacuated in lengths of [12][13][14][15][16][17][18][19][20] where the terms on the right represent respectively the variations meters which would then be assembled in the field. The costs in the capital cost of the cryogenic envelope, ~C.…”