Melt cast processed (MCP)-BSCCO 2212 tubes for power applications up to 10 kA

Self Cite

It is demonstrated that melt cast processed (MCP) BSCCO 2212 bulk material is an excellent candidate for resistive superconducting current limiters. For rod shaped samples it could be 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. The required long lengths of superconducting material can be easily obtained by machining the MCP-tubes into (bifilar) coils. The measured critical current density and its homogeneity over these large lengths were determined and proven to be sufficient for the designated application.

mentioning

confidence: 99%

Characterization of BSCCO 2212 bulk material for resistive current limiters

Elschner

Breuer

Wolf

et al. 2001

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“…In this process fine crystallites are evenly distributed in the MCP material leading to an enhanced microstructure with higher critical currents [4], better mechanical stability and simultaneously having a lower thermal conductivity, which is especially beneficial for the current lead application.…”

Section: Test Sample Fabricationmentioning

confidence: 98%

Current cycling test on HTSC for Westinghouse current leads

Selvaggi

Böck³

1995

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Absrrucz -To evaluate the reliability of high temperature superconducting current leads for repetitive current ramping operations such as in a magnetic separator, a ceramic high temperature superconductor with its copper terminals was subjected to current cycling tests in liquid nitrogen. The superconductor, a cylindrical rod of BSCCO-2212 fabricated by a melt cast process, has an initial J, (B=O) of 970 A/cm2 at 77 K and a total contact joint resistance for both terminals of 2 pR in the current range of 100 to 500 A. Due to power supply limitation, the cycling current magnitude was set at 50 A. The cycling rate was 1 cycle per minute, 30 seconds on 30 seconds off. After approximately 80,000 cycles and 250,000 cycles, measurements of J, and contact joint resistance were repeated. No degradation in either J, or contact joint resistance was detected. The testing and the test results are discussed in detail.

“…The Melt Cast Process of BSCCO 2212 consists of an optimized and well described [8] succession of melting, centrifugal casting, heat treatment and oxygenation processes. The result are superconducting tubes with diameters between 25 and 200 mm and lengths up to 1 m with integrated Ag contacts.…”

Section: A Tubesmentioning

confidence: 99%

Manufacturing and testing of MCP 2212 bifilar coils for a 10 MVA fault current limiter

Elschner

Breuer²,

Noë

et al. 2003

Self Cite

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. With tube shaped samples cut to bifilar coils and contacted in series, the required long lengths (160 m per phase) can easily be achieved. At the operating temperature of = 65 K the critical current density is near 4000 A/cm 2 and the voltage under limiting conditions reaches = 0 5 V/cm. The contribution describes the design, manufacturing and testing of the superconducting components. In particular the development and characterization of a suitable electrical shunt is focused. Finally the finished components are characterized with respect to electrical homogeneity and under various limiting conditions. It could be confirmed that the single components each meet all the requirements defined within the project. Index Terms-Bi 2 Sr 2 CaCu 2 O , bifilar coils, superconducting current limiter.