Progress in HTS Power Applications in the United States

Malozemoff, A. P.

doi:10.2221/jcsj.41.164

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…They fit in very compact installations as compared to conventional copper cables [11]. Thus, they can also be used in existing power lines and successfully transmit thousands of megawatts of electric power [12,13]. The need to be cooled to a cryogenic temperature requires a cooling process usually based on liquid nitrogen (77 K).…”

Section: Introductionmentioning

confidence: 99%

Design and construction of a high temperature superconducting power cable cryostat for use in railway system applications

Tomita¹,

Muralidhar²,

Suzuki³

et al. 2013

Supercond. Sci. Technol.

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The primary objective of the current effort was to design and test a cryostat using a prototype five-meter long high temperature Bi 2 Sr 2 Ca 2 Cu 3 O y (Bi-2223) superconducting dc power cable for railway systems. To satisfy the safety regulations of the Govt of Japan a mill sheet covered by super-insulation was used inside the walls of the cryostat. The thicknesses of various walls in the cryostat were obtained from a numerical analysis. A non-destructive inspection was utilized to find leaks under vacuum or pressure. The cryostat target temperature range was around 50 K, which is well below liquid nitrogen temperature, the operating temperature of the superconducting cable. The qualification testing was carried out from 77 down to 66 K. When using only the inner sheet wire, the maximum current at 77.3 K was 10 kA. The critical current (I c ) value increased with decreasing temperature and reached 11.79 kA at 73.7 K. This is the largest dc current reported in a Bi 2 Sr 2 Ca 2 Cu 3 O y or YBa 2 Cu 3 O y (Y-123) superconducting prototype cable so far. These results verify that the developed DC superconducting cable is reliable and fulfils all the requirements necessary for successful use in various power applications including railway systems. The key issues for the design of a reliable cryogenic system for superconducting power cables for railway systems are discussed.

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Section: Introductionmentioning

confidence: 99%

Design and construction of a high temperature superconducting power cable cryostat for use in railway system applications

Tomita¹,

Muralidhar²,

Suzuki³

et al. 2013

Supercond. Sci. Technol.

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Development of 10 kA high temperature superconducting power cable for railway systems

Tomita

Muralidhar

Suzuki

et al. 2012

Journal of Applied Physics

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The superconducting Bi2Sr2Ca2Cu3Oy “Bi-2223” tapes made with a powder-in-tube process laminated with a copper alloy have been used to design and develop a 5 m long multilayer concentric cable to be applied in railway systems. The electrical performance of the conductor has been evaluated with DC transport current at an economical 77 K (liquid nitrogen temperature) in the self-field. The inner and outer sheet wires were able to sustain electric currents of 10 130 A and 10 910 A, respectively. These values are sufficient for several types of commercial applications. The current values are significantly higher than the earlier reported ones in Bi-2223 or YBa2Cu3Oy “Y-123” superconducting cables, indicating that the tape quality has considerably improved.

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