Development and testing of HTS cables and terminations at ORNL

Gouge, M.J.; Demko, J. A.; Fisher, P.W.; Foster, C.A.; Lue, J.W.; Stovall, J.P.; Sinha, Uday Kumar; Armstrong, J. W.; Hughey, R.L.; Lindsay, D.; Tolbert, J.C.

doi:10.1109/77.920333

Cited by 22 publications

(7 citation statements)

References 7 publications

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“…A helium cryocooler ( 6) is integrated into the vacuum inter-space to cool the cryostat inner vessel. A copper thermal lead-through (7) is incorporated into the bottom of the inner vessel and connected to the helium expander by a copper flexible coupling (8) to allow for thermal contraction of the inner vessel.…”

Section: Design Overviewmentioning

confidence: 99%

“…A range of applications has been proposed in the generation and transmission of electrical power. Work to exploit the potential benefits of HTS has already been reported with prototype or commercial design of generators [1], transformers [2,3], current limiters, transmission cables, joints and terminations [4][5][6][7]. Potential benefits of increased power transfer, smaller dimensions or lower voltages offered by HTS cables are attractive to utilities.…”

Section: Introductionmentioning

confidence: 99%

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Variable pressure and temperature liquid nitrogen cryostat for optical measurements with applied electric fields

Swaffield

Lewin

Chen

et al. 2004

Meas. Sci. Technol.

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A cryostat with a high-voltage bushing, optical observation ports, variable controlled temperature and pressure has been designed to further the study of liquid nitrogen as a dielectric medium. The novelty in this design lies in the simultaneous achievement of these functions in a single design with a sufficiently large vessel to accommodate realistic geometries for high temperature superconducting power cable termination prototypes. In addition, a commercial single-stage helium expander cryo-cooler is integrated into the apparatus to achieve steady state temperatures down to 63.5 K, without the need for sacrificial loss of liquid nitrogen to maintain vessel temperature. The cryostat inner vessel is certified for operating pressures up to 2 MPa. A custom-made filled-resin bushing provides an electrical feed-through rated to 76.2 kV ac. For optical measurements with a range of sample geometries four optical ports are incorporated into the vessel utilizing sapphire windows and indium seals to form the inner pressure vessel. A technique employing a copper-vapour laser light source and high-speed digital camera for stroboscopic image capture of density change streamers and bubble dynamics with synchronized collection of electrical discharge data has been developed. This design has been used to study pre-breakdown phenomena, bubble dynamics with applied electric fields and electrical breakdown. General construction, mode of operation and initial results are presented.

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Section: Design Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Variable pressure and temperature liquid nitrogen cryostat for optical measurements with applied electric fields

Swaffield

Lewin

Chen

et al. 2004

Meas. Sci. Technol.

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“…We developed a calorimetric technique to measure the ac loss of prototype HTS cables. 7 Previously, single-phase prototype cables were made without a dielectric layer. To measure ac loss, we inserted the cable inside a G-10 tube filled with wax to create a radial thermal barrier between the HTS conductor and the liquid nitrogen bath.…”

Section: Calorimetricsmentioning

confidence: 99%

“…Initial test results of this HTS splice cable were reported in Ref. 7. The basic geometry of the HTS cable splice is shown in Fig.…”

Section: Performance Tests Of An Hts Power Transmission Cable Splicementioning

confidence: 99%

ORNL Superconducting Technology Program for Electric Power Systems--Annual Report for FY 2001

Hawsey¹

2002

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Two major new laboratories were renovated and equipped as part of the Accelerated Coated Conductor Initiative (ACCI). One laboratory houses conductor-processing facilities, and the other houses conductor-characterization facilities. Office space for two industrial partners and three postdoctoral fellows has been included in the laboratory design. To support the ACCI research activities at ORNL, two new staff members and three new postdoctoral fellows have been hired. Over $1M in new equipment was purchased for these laboratories. Industry has been involved through secure web-based exchange of long-length texture data, joint experiments, and equipment specifications. On-site industry assignments are anticipated in FY 2002. PROGRAMMATIC Three new documents were completed and posted on the ORNL HTS web site, http://www.ornl.gov/ HTSC/htsc.html. The Cryogenics Roadmap and the Cryogenic Implementation Plan were assembled and posted. In addition, an extensively revised and updated version of An Analysis of Future Prices and Markets for High Temperature Superconductors (the Mulholland Report) was completed. The report contains a detailed identification of the analysis pathways in the original Mulholland spreadsheet, identification of assumptions, examination of the specific device models, extension of the analysis period to 2025, and recalculations to reflect these changes.

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“…Note that between these two dc V-I measurements, the cable was subjected to high-voltage withstand tests to 18 kV, impulse tests to 90 kV, long-duration (72-h) testing at the design current and voltage, and tens of cool-down and warm-up cycles [3], [4]. The cable showed no degradation in its dc characteristics throughout these tests.…”

Section: DC Characteristics Of the Cablementioning

confidence: 99%

Fault current tests of a 5-m HTS cable

Lue

Barber

Demko

et al. 2001

IEEE Trans. Appl. Supercond.

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Abstract-The first industrial demonstration of a threephase high-temperature superconducting transmission power cable at the Southwire manufacturing complex is in progress. One crucial issue during operation of the 30-m HTS cables is whether they could survive the fault current (which can be over an order of magnitude higher than the operating current) in the event of a short-circuit fault and how HTS cables and the cryogenic system would respond. Simulated fault-current tests were performed at ORNL on a 5-m cable. This single-phase cable was constructed in the same way as the 30-m cables and is also rated for 1250 A at 7.2 kV ac line-to-ground voltage. Tests were performed with fault-current pulses of up to 15 kA (for 0.5 s) with pulse lengths of up to 5 s (at 6.8 kA). Although a large voltage drop was produced across the HTS cable during the fault-current pulse, no significant changes in the coolant temperature, pressure, or joint resistance were observed. The cable survived 15 simulated fault-current shots without any degradation in its V-I characteristics.

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Development and testing of HTS cables and terminations at ORNL

Cited by 22 publications

References 7 publications

Variable pressure and temperature liquid nitrogen cryostat for optical measurements with applied electric fields

Variable pressure and temperature liquid nitrogen cryostat for optical measurements with applied electric fields

ORNL Superconducting Technology Program for Electric Power Systems--Annual Report for FY 2001

Fault current tests of a 5-m HTS cable

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