Journal ArticleDOI
Melt cast processed (MCP)-BSCCO 2212 tubes for power applications up to 10 kA
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TLDR
The Melt Cast process (MCP) is highly flexible to manufacture BSCCO 2212 bulk parts in a large variety of shapes and dimensions as mentioned in this paper, and it also allows the integration of current contacts during the fabrication process thus leading to HTS parts which can directly be integrated into electrotechnical devices, the ease of mechanical treatment of the material by machining methods offers additional options for the MCP bulk parts.Abstract:
The Melt Cast process (MCP) is highly flexible to manufacture BSCCO 2212 bulk parts in a large variety of shapes and dimensions. MCP also allows the integration of current contacts during the fabrication process thus leading to HTS parts which can directly be integrated into electrotechnical devices, The ease of mechanical treatment of the material by machining methods offers additional options for the MCP bulk parts. Critical current densities of 2.5-4 kA/cm/sup 2/ are obtained in selffield, about 1 kA/cm/sup 2/ are measured in full rods. High DC (6.4 kA) and AC (10 kA) transport currents are obtained in large tubes (O 70 mm, L 200 mm) at 77 K. Different prototypes and a first application, each of low loss hybrid current leads, have been produced as well as functional models for current limiting and for shielding. >read more
Citations
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Journal ArticleDOI
CURL 10: development and field-test of a 10 kV/10 MVA resistive current limiter based on bulk MCP-BSCCO 2212
TL;DR: In this article, a three-phase resistive current limiter was developed and successfully tested up to the nominal voltage and power (10 kV, 10 MVA) for the CURL 10 project.
Journal ArticleDOI
First commercial medium voltage superconducting fault-current limiters: production, test and installation
R. Dommerque,S. Krämer,A. Hobl,R Böhm,M. Bludau,Joachim Bock,D Klaus,H Piereder,A Wilson,T Krüger,G Pfeiffer,K Pfeiffer,S. Elschner +12 more
TL;DR: Nexans SuperConductors GmbH made the step from R&D activities to the production of the first non-publicly funded fault-current limiter units as discussed by the authors.
Journal ArticleDOI
Manufacturing and testing of MCP 2212 bifilar coils for a 10 MVA fault current limiter
TL;DR: In this paper, a very promising option within the German 10 kV/10 MVA superconducting fault current limiter project CURL 10 is melt cast processed (MCP-) BSCCO 2212 bulk material.
Journal ArticleDOI
Development and successful testing of MCP BSCCO-2212 components for a 10 MVA resistive superconducting fault current limiter
TL;DR: The German government funded resistive superconducting fault current limiter project CURL 10 is based on bulk material and aims at the development of a three-phase prototype for the medium voltage level (10kV, 10kV).
Journal ArticleDOI
Characterization of BSCCO 2212 bulk material for resistive current limiters
TL;DR: In this paper, it was shown that a homogeneous voltage of more than 1 V/cm can be established over the whole length of the sample leading to a substantial limiting of short circuit current.
References
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Diffusion solidification model on Y-system superconductors
TL;DR: The unidirectional solidification of the zone melt method was performed in order to clarify the growth mechanism on Y-system superconductors as mentioned in this paper, and a sharp faceted interface of YBa2Cu3Oy (123) crystals was obtained in the sample grown at the low growth rate of 1 mm/h.
Journal ArticleDOI
Large shaped parts of melt cast BSCCO for applications in electrical engineering
TL;DR: In this paper, a melt casting process tailor made for BSCCO, especially for the 2212 phase, is described, and the properties of the material obtained by MCP have been significantly improved by admixing strontium sulphate.
Journal ArticleDOI
Influence of granularity on the critical current density in melt-cast processed Bi2Sr2CaCu2Ox
S Elschner,J Bock,H. Bestgen +2 more
TL;DR: In this article, microstructural analysis of melt-cast processed Bi2Sr2CaCu2Ox reveals the existence of grain boundaries on two different length scales and the impact of the grain boundaries within and between bundles on the critical current density.
Journal ArticleDOI
Cryogenic load calculation of high Tc current lead
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TL;DR: In this paper, the authors evaluated the performance of high temperature superconducting current leads in self-field and applied fields up to 0.2 T. The use of very short high Tc conductor parts (50 mm) and the possibility of fabricating a short metallic lead for 77 K operation allowed them to design very short ( ITR cannot be accepted, a safety margin must be considered in the design of the current lead).
Book ChapterDOI
The Impact of Oxygen on Melt Processing of Bi-HT Superconductors
J. Bock,S. Elschner,E. Preisler +2 more
TL;DR: In this article, a single phase 2-layer material with enhanced properties was yielded with melt processing in contrast to usual sintering procedures, and the oxygen partial pressure plays an important role.