Recent Progress of Experiment on DC Superconducting Power Transmission Line in Chubu University

Hamabe, M.; Fujii, Tomohiro; Yamamoto, I.; Sasaki, Atsushi; Nasu, Y.; Yamaguchi, S.; Ninomiya, A.; Hoshino, Tsutomu; Ishiguro, Yasuhide; Kawamura, K.

doi:10.1109/tasc.2009.2018241

Cited by 37 publications

(15 citation statements)

References 10 publications

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“…Therefore, the critical current and the n-value of each HTS tape in the inner layer were measured at every cooling cycle. At the 3rd period, the critical current measurement was carried out at various temperatures from 74.1 K to 79.7 K, and it was found that the critical current at the 1st and the 2nd period fit well to the temperature dependence at the 3rd period [10]. Also at the 4th period, the critical current of each HTS tape was measured at 76.5 K, and the mean value of the critical current at the 4th period fit well to the same line as shown in figure 7(a).…”

Section: Effect Of Cooling Cyclesmentioning

confidence: 93%

“…One of the characteristics of our DC SC-PT cable is that the HTS tapes in the inside layer does not touch each other. Hence, the properties of every HTS tape in the inside layer can be individually examined after cooling down the cable [10]. A copper(Cu) former and a Cu shield in figure 2 were connected to the earth potential at the cable end of the cryostat A in figure 1.…”

Section: Experimental Devicementioning

confidence: 99%

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Cooling cycle test of DC superconducting power transmission cable

Hamabe

Fujii

Sugino

et al. 2010

J. Phys.: Conf. Ser.

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Section: Effect Of Cooling Cyclesmentioning

confidence: 93%

Section: Experimental Devicementioning

confidence: 99%

Cooling cycle test of DC superconducting power transmission cable

Hamabe

Fujii

Sugino

et al. 2010

J. Phys.: Conf. Ser.

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“…However, as mentioned above, cryostats are conventionally made of flexible corrugated pipes having a high hydraulic resistance. At the moment, there are only two test facilities in the world which are made of smooth pipes to facilitate the circulation of the LN 2 [6][7][8]. Alternative approaches to the construction of cryostats are illustrated in Figure. 1.…”

Section: Advances In Cryogenic Engineeringmentioning

confidence: 99%

Choice of flexible cryostat for 2.5 km DC HTS cable to be laid in St. Petersburg

Ivanov¹,

Romashov²,

Bemert³

et al. 2014

AIP Conference Proceedings

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Abstract. HTS tapes production technology has reached the level which allows the manufacture of high-quality cables of long length. In this connection, the issue of creating an HTS power transmission line of some kilometer length had been raised. Pressure loss appears as one of the limiting factors in the circulation of the liquid nitrogen cooling HTS cable placed in a long cryostat. Pressure loss is small in short lines and for this reason did not attract close attention of researchers until recently. Within the framework of the Russian R&D program for HTS power devices, 30 and 200 m AC HTS power transmission lines were created in 2008 and 2010, respectively, and a new 2.5 km 50 MW DC line to be installed in a real city network of St. Petersburg is now at the design and development phase. Pressure loss calculations show the 64/70 mm NEXANS-type corrugated flexible cryostat to be optimal for the cooling channel and the 39/44 mm one -for the return channel. In this case, it is possible to use just one cryopump and one cryocooler to achieve an operational temperature difference of 4-6 K and a pressure drop of 0.1-0.2 MPa in the cooling channel at a flow rate of 20-30 l/min.

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“…Laboratory demonstration of DC superconducting cable has been carried out at Chubu University in Japan. [19] A proposal for a DC superconducting electricity "pipeline" is shown in Figure 6.…”

Section: Direct Current Transmission Optionsmentioning

confidence: 99%

Integrating Renewable Electricity on the Grid

Crabtree

Misewich

Ambrosio³

et al. 2011

AIP Conference Proceedings

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Abstract. The demand for carbon-free electricity is driving a growing movement of adding renewable energy to the grid. Renewable Portfolio Standards mandated by states and under consideration by the federal government envision a penetration of 20-30% renewable energy in the grid by 2020 or 2030. The renewable energy potential of wind and solar far exceeds these targets, suggesting that renewable energy ultimately could grow well beyond these initial goals.The grid faces two new and fundamental technological challenges in accommodating renewables: location and variability. Renewable resources are concentrated at mid-continent far from population centers, requiring additional long distance, high-capacity transmission to match supply with demand. The variability of renewables due to the characteristics of weather is high, up to 70% for daytime solar due to passing clouds and 100% for wind on calm days, much larger than the relatively predictable uncertainty in load that the grid now accommodates by dispatching conventional resources in response to demand.Solutions to the challenges of remote location and variability of generation are needed. The options for DC transmission lines, favored over AC lines for transmission of more than a few hundred miles, need to be examined. Conventional high voltage DC transmission lines are a mature technology that can solve regional transmission needs covering one-or two-state areas. Conventional high voltage DC has drawbacks, however, of high loss, technically challenging and expensive conversion between AC and DC, and the requirement of a single point of origin and termination. Superconducting DC transmission lines lose little or no energy, produce no heat, and carry higher power density than conventional lines. They operate at moderate voltage, allowing many "on-ramps" and "off-ramps" in a single network and reduce the technical and cost challenges of AC to DC conversion. A network of superconducting DC cables overlaying the existing patchwork of conventional transmission lines would create an interstate highway system for electricity that moves large amounts of renewable electric power efficiently over long distances from source to load.

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Recent Progress of Experiment on DC Superconducting Power Transmission Line in Chubu University

Cited by 37 publications

References 10 publications

Cooling cycle test of DC superconducting power transmission cable

Cooling cycle test of DC superconducting power transmission cable

Choice of flexible cryostat for 2.5 km DC HTS cable to be laid in St. Petersburg

Integrating Renewable Electricity on the Grid

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