AC Loss Reduction of Superconducting Power Transmission Cables Composed of Coated Conductors

AC losses in power transmission cables composed of coated conductors could be potentially small. A strategy to approach their potentially small AC loss was studied. AC losses in mono-layer conductors for cables were calculated numerically in order to show the principle for AC loss reduction: use of narrower coated conductors and/or decrease in space between conductors reduce the magnetic field component perpendicular to the wide face of coated conductors, and they are effective for AC loss reduction. This principle was confirmed experimentally by using short mono-layer conductors. Based on the principle, 1 kArms-class three-layer conductors were fabricated, and AC loss of 0.054 W/m at 1 kArms was achieved in a three-layer conductor whose outer diameter is 19.6 mm. The influence of a magnetic substrate on the AC losses in a single coated conductor and a mono-layer conductor for a cable was studied numerically.

[1]  S. Satō,et al.  Electromagnetic Field Analysis of YBCO Coated Conductors in Multi-Layer HTS Cables , 2006, IEEE Transactions on Applied Superconductivity.

[2]  Teruo Izumi,et al.  Development of HTS power cable using YBCO coated conductor , 2006 .

[3]  Joon-Han Bae,et al.  Design and Experimental Results of a 3 Phase 30 m HTS Power Cable , 2006, IEEE Transactions on Applied Superconductivity.

[4]  T. Masuda,et al.  Overview of the underground 34.5 kV HTS power cable program in albany, NY , 2005, IEEE Transactions on Applied Superconductivity.

[5]  R. Perin.  Superconducting magnets , 1982, Nature.

[6]  Yong Zhang,et al.  Introduction of China's first live grid installed HTS power cable system , 2005, IEEE Transactions on Applied Superconductivity.

[7]  W. T. Norris,et al.  Calculation of hysteresis losses in hard superconductors carrying ac: isolated conductors and edges of thin sheets , 1970 .

[8]  T. Masuda,et al.  Electric properties of a 66 kV 3-core superconducting power cable system , 2003 .

[9]  T.E. Welsh,et al.  Development and demonstration of a long length HTS cable to operate in the long island power authority transmission grid , 2005, IEEE Transactions on Applied Superconductivity.

[10]  Naoyuki Amemiya,et al.  Numerical modelings of superconducting wires for AC loss calculations , 1998 .

[11]  A. Kikuchi,et al.  Measurement of AC losses in an HTS conductor by calorimetric method , 2003 .

[12]  P. W. Fisher,et al.  Tests of tri-axial HTS cables , 2005, IEEE Transactions on Applied Superconductivity.

[13]  Tatsuki Okamoto,et al.  Demonstration and verification tests of a 500 m HTS cable in the super-ACE project , 2005 .

[14]  G. Vellego,et al.  An analysis of the transport losses measured on HTSC single-phase conductor prototypes , 1995 .