Within the German project CURL 10 a full scale three-phase resistive current limiter was developed and successfully tested up to nominal voltage power (10 kV, MVA). This is today largest HTS world wide. The device based on bifilar coils of MCP-BSCCO 2212 bulk material operates at T=66 K. Per phase 30 components are connected in series order obtain required resistance. electrical stabilization metallic shunt contacted continuously superconductor allows fields 0.6 V/cm. We report development...

In 2008/09 Nexans SuperConductors GmbH made the step from R&D activities to production of first non-publicly funded fault-current limiter units. close cooperation with two customers, Applied Superconductor Limited (ASL, UK) and Vattenfall (Germany), was able design, produce deliver resistive superconducting devices. Both devices are designed for medium voltage grid were tested at high power lab IPH in Berlin. The components both limiters, coils bulk MCP BSCCO-2212, have been produced by Nexans.

Nexans SuperConductors GmbH (NSC) has successfully designed, built and tested the first two HTS Fault Current Limiter (FCL) systems on a commercial basis for different application cases in Europe. Both are live customer grids since last quarter of 2009: The one is installed UK where it acts as bus bar coupler MV grid. second protecting auxiliary supply brown coal power station Germany. superconducting components based bulk melt cast processed BSCCO-2212 material. NSC masters full product...

A new German government funded project for a resistive fault current limiter has started in September 2009 (ENSYSTROB) and is presented. The consortium includes partners from industry, research centers utilities. It aims the construction of 3-phase medium voltage (12 kV, 800 A) protection domestic supply power plant. special feature this application presence large in-rush currents (4100 Ap 50 ms, 1800 15 s). superconducting components are bifilar pancake coils consisting pairs YBCO-tapes...

The ESR, magnetic susceptibility, and resistivity measurements of ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{CuO}}_{4+\mathrm{\ensuremath{\delta}}}$ doped with Mn are performed in the broad regions temperature, Sr concentrations, respectively. temperature concentration dependence ESR signal can be understood according to a model collective motion moments Cu ions linewidth determined mainly by spin relaxation...

A very promising option within the German 10 kV/10 MVA superconducting fault current limiter project CURL is melt cast processed (MCP-) BSCCO 2212 bulk material. With tube shaped samples cut to bifilar coils and contacted in series, required long lengths (160 m per phase) can easily be achieved. At operating temperature of T=65 K critical density near 4000 A/cm/sup 2/ voltage under limiting conditions reaches E/sub p/=0.5 V/cm. The contribution describes design, manufacturing testing...

A melt casting process (MCP) that is tailor made for BSCCO, especially the 2212 phase, described. It reported offers an easy access to a variety of different shapes and sizes. The properties material obtained by MCP have been significantly improved admixing strontium sulphate. J/sub c/ values superior those sintered ceramics YBCO or BSCCO obtained: at 55000 A/cm/sup 2/ (4 K) 2200 (77 were achieved without external fields; large bulk parts exhibited more than 2000 in their self-field....

Superconducting fault current limiters (SCFCL) offer an attractive means to limit short-circuit currents in power systems. Comparisons of available HTS material led the derision investigate melt cast processed (MCP) BSCCO and textured polycrystalline YBCO for use resistive SCFCLs. As a great length superconductor per unit element is preferred, samples are shaped as bifilar coils prepared from tubes manufactured meander geometry. Test results concerning contact resistances, E-J curves, AC...

Recent investigations show that high Tc bulk material is an attractive option in resistive superconducting fault current limiters. Our investigation focuses on the short-circuit behavior of long samples MCP-BSCCO2212 and polycrystalline melt-textured YBCO. The experiments have been performed for different operating temperatures, duration prospective currents. measurements demonstrate a metallic bypass needed to avoid destructive hot spots during quench. Quench limitation tests bifilar coils...

A European BRITE/EURAM project for the development of current leads in kA range using high-T/sub C/ superconductor parts has been started recently. The partners this two-year are two chemical companies, Hoechst and Rhone-Poulenc, companies field electrical engineering, Siemens Alcatel Alsthom. goal these four is to develop 4.2-K systems making use superconducting materials, manufacture them, demonstrate their performance comparison with conventional all-metal lead, relevant models. objective...

SuperPower, Inc. and Nexans SuperConductors GmbH have partnered to develop a superconducting fault current limiter for transmission level applications. The device employs SuperPower's Matrix Fault Current Limiter (MFCL) technology BSCCO-2212 bulk material manufactured by Nexans' melt cast processing technique. development program has been underway since June 2002 is divided into series of prototype demonstrations progressive capability, culminating in Beta that will be installed at host...

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 current contacts during fabrication thus leading HTS which can directly be integrated into electrotechnical devices, ease mechanical treatment material by machining methods offers additional options for parts. Critical densities 2.5-4 kA/cm/sup 2/ are obtained selffield, about 1 measured full rods. High DC (6.4 kA) AC (10 transport...

The microstructural analysis of melt-cast processed Bi2Sr2CaCu2Ox reveals the existence grain boundaries on two different length scales. Plate-shaped crystal grains approximately 10 mu m are textured along c direction a scale 200-300 m, forming bundles arbitrary orientation. To investigate impact within and between critical current density authors have analysed variation magnetic hysteresis with sample size using powder fractions bulk material. It could be shown that platelets bundle limit...

The electrochemical oxidation of zirconium and hafnium double‐deckers M(P) 2 (M=Zr, Hf; P=OEP, TPP) (Scheme 1) 2) leads to mono‐ dications which show near infrared absorption bands are ≈ 2000 cm ‐1 higher energy than those the corresponding cerium double‐decker cations. [Zr(OEP) ]X, ]X , [Zr(TPP) (X=ClO 4 − PF 6 ) isolated after characterized by IR NMR spectroscopy. Magnetic susceptibility measurements (2 K < T 300 K) solids confirm strong coupling electron spins in diamagnetic dication...

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 medium voltage level (10 kV, MVA). key element suitable robust components. On basis well known melt cast process (MCP) BSCCO-2212, these are manufactured by cutting tubes to bifilar coils. At operation temperature 65 K density 4000 A cm−2 was achieved. In order protect superconductor during limitation component...

It is demonstrated that melt cast processed (MCP) BSCCO 2212 bulk material an excellent candidate for resistive superconducting current limiters. For rod shaped samples it could be shown a homogeneous voltage of more than 1 V/cm can established over the whole length sample leading to substantial limiting short circuit current. The require long lengths easily obtained by machining MCP-tubes into (bifilar) coils. measured critical density and its homogeneity these large were determined proven...

We show that tubes of melt cast Bi-2212 used as current leads for LTS magnets can also act efficient magnetic shields. The screening properties under an axial DC field are characterized at several temperatures below the liquid nitrogen temperature (77 K). Two main shielding studied and compared with those Bi-2223, a material has been considered in past bulk first property is related to maximum flux density be screened, Blim; it defined applied which attenuation measured centre shield exceeds...

This paper deals with the magnetic properties of bulk high temperature superconducting cylinders used as shields. We investigate, both numerically and experimentally, a hollow cylinder two axial slits which cut in equal halves. Finite element method modelling has been three-dimensional geometry to help us understanding how currents flow such therefore shielding are affected, depending on field orientation. Modelling results show that block current act an 'entrance channel' for flux lines....

[BAs an extension of the Melt Cast Process (MCP) centrifugal casting technique is a flexible method for manufacturing Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ bulk parts. It provides large scale rings and tubes, needed high current electrotechnical applications as leads inductive fault limiters. Low resistance contacts are integrated right in fabrication process. Intrinsic (self field free) densities up to 4 kA/cm/sup 2/ (T=77 K) could be determined on small samples. Tubes with diameter 70 mm...

Considering the phase equilibrium diagram of Bi2O3-PbO-SrO-CaO-CuO system, ceramics 2223 with composition Bi1.8Pb0.4Sr2Ca2Cu3O10+d have been transformed by a simple annealing procedure into multi-phase samples. The transformation results in four-fold increase critical current density at 2 T and 30 K (three-fold 1 50 K), which is believed to express an enhanced pinning capacity material. nature centres produced not yet clarified.

Nexans SuperConductors has designed, built, tested and installed a number of such SFCL systems in different areas cases operation with various requirements specifications from DNOs or power generation industry. The designs as well the test results are presented. Prospective short-circuit currents order 50 kA have been limited to below 10 according design limiter. limiters shown reliable during field tests durations about one year each. (4 pages)

Within a German government funded project superconducting (HTS) high current DC-busbar is under development. The aim the fabrication of demonstrator with length 25 m and nominal 20 kA for installation test in an industrial real-life application. concept modular system rigid elements arbitrary length, straight or defined bends, each equipped own cryostat premanufactured factory. These can easily be transported, but have to joined on site. To manufacture such several issues had addressed:...