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A three-in-one HTS cable has been developed. Its cable core is composed of a conductor and a shield wound with BSCCO and electrical insulation of the PPLP. The three cable cores are covered in thermal insulated stainless corrugated pipes. The BSCCO wires represent a dramatic innovation by virtue of a newly developed process named Controlled Over-Pressure (CT-OP). As a new cable technology, a 350-m thermal insulation pipe was tested for 7 months to find that the life of the vacuum intensity is more than 10 years. The HTS cable with tension members was designed for installation into an underground duct. In addition, a fault current of 23 kA, 0.63 s, was applied to a sample cable with no damage to the BSCCO wires or the cable insulation. These technologies will be applied to the Albany project in the USA. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 162(1): 15–24, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20577 [ABSTRACT FROM AUTHOR]

To verify the practicability for intended application, TEPCO and SEI have jointly developed a 100 m, 66 kV class High Temperature superconducting power cable system and tested for a long duration one year at the CRIEPI test site. The cable has three cores in a cryostat and a cold dielectric configuration. The three cores are stranded loosely to manage thermal contraction during the cooling process. The cable is warmed to room temperature after each test to investigate the influence of the cooling cycle. At the initial cooling of the system, the tension of the cable due to thermal contraction during the cooling process was measured to be about 8 kN, which is considerably lower than 50 kN measured in a short length model cable without measures against thermal contraction. System properties, such as critical current, AC loss, shield current and so on are measured during each test after the cooling cycle. During the test program, the system shows no change in its properties. [ABSTRACT FROM AUTHOR]

We have started a project to develop a 100 m 3-core 66 kV/1 kA/114 MVA high temperature superconducting (HTSC) cable system to certify the manufacturing capability and the practicability of an HTSC cable system for use as actual power system equipment. The cable is designed based on the results of a 30 m, 3-core test cable. The cable is composed of a conductor and a shield wound with Ag–Mn sheathed Bi-2223 tapes, electrical insulation with polypropylene laminated paper impregnated with liquid nitrogen and thermal insulation with co-axial corrugated pipes. The three cores are housed in this thermally insulated pipe. The cable has been developed and laid at CRIEPIs test site and long-term tests have been under way since June. [Copyright &y& Elsevier]

A high temperature superconducting (HTSC) cable is expected to transport large electric power with a compact size because of its high critical current density. We have been developing a 3-core 66 kV class HTSC cable, which is applied to the ∅150 mm duct, and is composed of a conductor and a shield wound with Ag–Mn sheathed Bi-2223 tapes, electrical insulation with polypropylene laminated paper impregnated with liquid nitrogen and thermal insulation with co-axial corrugated pipes.A 30 m, 3-core cable system has been constructed to verify the 3-core performance after its production, laying and cooling. The cable had good performance to mechanical stress in the factory process. The critical current of the cable was more than 2.4 kA at 77 K. The AC loss of the conductor part was 0.5 W/m/phase at 1 kA rms, which agreed well with the calculated value of the spiral pitch adjustment technique. A 130 kV rms AC was successfully applied without any change in tanδ and capacitance. As a next step, a 100 m HTSC cable has been designed and developed based on these experimental results. [Copyright &y& Elsevier]