Status of a 200-Meter DC Superconducting Power Transmission Cable After Cooling Cycles

We constructed a facility of a 200-m HTS power transmission test cable (CASER-II) in 2010. Generally, an HTS cable contracts about 0.3% when it is cooled from room temperature to liquid nitrogen (LN2) temperature. The contraction of the 200-m HTS cable corresponds to 0.6 m. In order to realize the H...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2013-06, Vol.23 (3), p.5400204-5400204
Main Authors: Hamabe, M., Watanabe, H., Jian Sun, Yamamoto, N., Kawahara, T., Yamaguchi, S.
Format: Article
Language:English
Subjects:
Applied sciences
Cables
Cooling
Cryogenic system
Cryogenics
DC power transmission
DC superconducting cables
Density
Design. Technologies. Operation analysis. Testing
Electric connection. Cables. Wiring
Electrical engineering. Electrical power engineering
Electrical power engineering
Electronics
Exact sciences and technology
Flow rate
Heating
High temperature superconductors
Integrated circuits
Liquid nitrogen
Miscellaneous
Pipe
Power cables
Power networks and lines
Power transmission
Pressure drop
R&D
Research & development
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
siphon effect
Superconducting cables
Various equipment and components
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Summary:We constructed a facility of a 200-m HTS power transmission test cable (CASER-II) in 2010. Generally, an HTS cable contracts about 0.3% when it is cooled from room temperature to liquid nitrogen (LN2) temperature. The contraction of the 200-m HTS cable corresponds to 0.6 m. In order to realize the HTS power transmission system, it is an essential issue to absorb the mechanical stress of the HTS cable during the cycles of cooling-down and heating-up. The CASER-II uses smooth pipes as the cryogenic pipe for the cable line to reduce the pressure drop of the liquid nitrogen flow, whereas the other HTS cables use corrugated pipes to absorb the mechanical stress. The CASER-II employed (1) the movable terminals at the cable end, and (2) the extendable bellows inserted in the cryogenic pipe, to absorb the contraction of 0.6 m in cooling cycles. Even at the 4th cooling-down test, no damage was observed in the CASER-II. Use of the smooth cryogenic pipe enabled low pressure drop with low LN2 flow rate, and negative pressure drop appeared at less than 5 L/sec of the LN2 flow rate. This negative pressure drop was caused by the LN2 flow assisted by siphon effect due to the difference of LN2 density along the cryogenic pipe line with elevation of 2.6 m.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2012.2235510