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Applications of High Tc Superconductivity Part 4

Tham khảo tài liệu 'applications of high tc superconductivity part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Superconductivity Application in Power System 49 Fig. 4. General conceptual diagram of HTS cable system 2.2.1 HTS cable Three kinds of HTS cable in outward appeareance are developed. Fig 5 shows single core cable co-axial core cable tri-axial cable. b tri-axial cable a Single core cable c Co-axial cable Fig. 5. HTS cable type classified by core Usually single core type is for transmission tri-axial type is for subtransmission and coaxial type is distribution. The performance of HTS cable depends on the quality of HTS tape. HTS tape for power cable has to be produced long enough to fulfill the required length of cable core to be 50 Applications of High-Tc Superconductivity installed also have sufficient critical current density and uniform current and good mechnical characteristics. Recently the improvement of critical current and length in Bismuth series high temperature superconducting wire make possible to realize HTS power cable application in real field. BSCCO-2223 the recently developed HTS conductor which has almost 110 K critical temperature is mainly applied to make HTS cable. Fig. 6 shows CD type HTS cable cross section. It is composed with Former copper conductor HTS Electrical Insulation PPLP electrical shielding HTS stainless sheath for thermal insulation and cladding material. Fig. 6. Cross section of HTS cable CD type for distribution system Table 2 shows one of HTS cable specification for 22.9kV distribution line. It is designed for replace present distribution cable system without changing underground right of way. Item Specification Former Stranded copper Conductor Bi-2223 2 layer Shield layer Bi-2223 1 layer Electrical insulation PPLP 4.5 mm Cable core diameter 35 mm Superconductor shield Bi-2223 tape Thermal insulation Double corrugated pipe MLI Vacuum Oversheath PE Cable outer diameter 130 mm Table 1. Example of HTS cable specifications CD type for distribution system 2.2.2 Cooling facility Cooling facility is another important component of HTS