Cryogenic System for a High Temperature Superconducting Power Transmission Cable Page: 2 of 9
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CRYOGENIC SYSTEM FOR A HIGH-TEMPERATURE
SUPERCONDUCTING POWER TRANSMISSION CABLE
J. A. Demkol, J. W. Lue1, M. J. Gouge1, J. P. Stovall',
R. Martin, U. Sinha2, and R. L. Hughey2
'Oak Ridge National Laboratory
P.O. Box 2009, Oak Ridge, TN 37831-8071, USA
One Southwire Drive, Carrollton, GA 30119, USA
High-temperature superconducting (HTS) cable systems for power transmission are
under development that will use pressurized liquid nitrogen to provide cooling of the cable
and termination hardware. Southwire Company and Oak Ridge National Laboratory have
been operating a prototype HTS cable system that contains many of the typical components
needed for a commercial power transmission application. It is being used to conduct
research in the development of components and systems for eventual commercial
deployment. The cryogenic system was built by Air Products and Chemicals, Allentown,
Pennsylvania, and can circulate up to 0.35 kg/s of liquid nitrogen at temperatures as low as
67 K at pressures of 1 to 10 bars. Sufficient cooling is provided for testing a 5-m-long HTS
transmission cable system that includes the terminations required for room temperature
electrical connections. Testing of the 5-m HTS transmission cable has been conducted at
the design ac conditions of 1250 A and 7.5 kV line to ground. This paper contains a
description of the essential features of the HTS cable cryogenic system and performance
results obtained during operation of the system. The salient features of the operation that
are important in large commercial HTS cable applications will be discussed.
A series of tests of the Southwire Company's first 5-m high-temperature
superconducting (HTS) transmission cable were conducted at Oak Ridge National
Laboratory (ORNL). A simplified diagram for the HTS cable cryogenic system is provided
in Fig. 1 that shows the main flow loop and instrumentation locations used in the pressure
drop and calorimetric measurements of the HTS cable system. Figure 2 illustrates how the
liquid nitrogen flows through the cable in a counterflow cooling mode.
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Demko, J.A.; Gouge, M.J.; Hughey, R.L.; Lue, J.W.; Martin, R.; Sinha, U. et al. Cryogenic System for a High Temperature Superconducting Power Transmission Cable, article, July 12, 1999; Tennessee. (digital.library.unt.edu/ark:/67531/metadc624543/m1/2/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.