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Soika R.,Nexans Deutschland GmbH | Garcia X.G.,ICMAB | Nogales S.C.,Endesa
IEEE Transactions on Applied Superconductivity

Nexans, ICMAB-CSIC, Tecnalia and UAB have collaborated on the ENDESA Supercable, a 30 m long, medium-voltage superconducting ac power cable. The cable was developed and manufactured within the framework of the ENDESA Novare program. With a rated current of 3200 A, a 3-phase system based on this cable is able to transmit 138 MVA at its envisioned operating voltage of 25 kV. While the cable was designed for 25 kV, the terminations available for cable testing were rated for the 20-kV class. Consequently the high voltage tests were carried out at the levels appropriate for 20 kV cable systems. The cable has successfully passed all high voltage and load cycle tests. The load cycles consisted of ten 24-hour cycles during which, with a voltage of 2 · UO applied for the full duration of the 10 test cycles, the rated current of 3200 A was applied for 8 hours. The ac losses of the cable were also measured. The successful prototype testing of the cable confirmed the design, manufacturing, and performance of this high transmission capacity cable: To our knowledge, it is the highest ampacity power cable so far that has passed the rigorous load cycle test protocol of a similarly rated conventional cable. © 2011 IEEE. Source

Lopez J.,Polytechnic University of Catalonia | Maynou R.,Polytechnic University of Catalonia | Granados X.,ICMAB | Grau J.,Polytechnic University of Catalonia | And 2 more authors.
Physics Procedia

Multiple studies have reported information about the magnetization by pulses applied in YBCO superconducting pellets. "Electrical machines" is one of the areas where it is possible to take advantage of using superconducting magnetized pellets by the high magnetic trapped field. However, it is well known the strong dependence of the maximum value of remanence with temperature. The relaxation experienced by the HTS, once the pulse magnetization has finished, and the heat generated in the superconductor by the effect of the "supercritical" currents generated during the flux penetration, make the maximum trapped field lower than expected considering a critical state model. In this work we present simulations performed, with a commercial finite element program, about the resulting magnetization in the HTS superconducting pellets, taking into account the influence of temperature. ©2012 Published by Elsevier B.V. Selection and/or peer-review under responsibility of the Guest Editors. Source

Dubal D.P.,Catalan Institute of Nanoscience and Nanotechnology | Suarez-Guevara J.,Catalan Institute of Nanoscience and Nanotechnology | Tonti D.,ICMAB | Enciso E.,Complutense University of Madrid | Gomez-Romero P.,Catalan Institute of Nanoscience and Nanotechnology
Journal of Materials Chemistry A

In pursuit of high capacitance and high energy density storage devices, hybrid materials have quickly garnered well-deserved attention based on their power to merge complementary components and properties. Here, we report the fabrication of all-solid state symmetric supercapacitors (ASSSC) based on a double hybrid approach combining a hybrid electrode (reduced graphene oxide-phoshomolybdate, rGO-PMo12) and a hybrid electrolyte (hydroquinone doped gel-electrolyte). To begin with, a high-performance hybrid electrode based on H3PMo12O40 nanodots anchored onto rGO was prepared (rGO-PMo12). Later, an all-solid state symmetric cell based on these rGO-PMo12 electrodes, and making use of a polymer gel-electrolyte was assembled. This symmetric cell showed a significant improvement in cell performance. Indeed, it allowed for an extended potential window by 0.3 V that led to an energy density of 1.07 mW h cm-3. Finally, we combined these hybrid electrodes with a hybrid electrolyte incorporating an electroactive species. This is the first proof-of-design where a redox-active solid-state gel-electrolyte is applied to rGO-PMo12 hybrid supercapacitors to accomplish a significant enhancement in the capacitance. Strikingly, a further excellent increase in the device performance (energy density of 1.7 mW h cm-3) was realized with the hybrid electrode-hybrid electrolyte combination cell as compared to that of the conventional electrolyte cell. Thus, this unique symmetric device outclasses the high-voltage asymmetric counterparts under the same power and represents a noteworthy advance towards high energy density supercapacitors. © The Royal Society of Chemistry 2015. Source

Ponrouch A.,ICMAB | Ponrouch A.,Alistore European Research Institute | Palacin M.R.,ICMAB | Palacin M.R.,Alistore European Research Institute
ECS Transactions

Carbon coating on battery electrode active material powders is currently achieved through chemical procedures involving dispersing the powder in a liquid medium with a carbon precursor followed by thermolysis at high temperatures (ca. 700°C). This procedure has the drawback of not being applicable to materials which may decompose or reduce under such conditions. We present herein an alternative procedure based on physical deposition of carbon, carried out at room temperature under dry conditions, hence avoiding the limitations mentioned above and being generally applicable to any electrode active material. Homogeneous conformal coating was achieved and results are herein presented regarding improved electronic conductivity and limited side reactions recorded upon oxidation and reduction for carbon coated powder active materials in Li cells. © 2014 The Electrochemical Society. Source

Lazic Z.,HTS 110 | Chamritski V.,HTS 110 | Pooke D.,HTS 110 | Valvidares S.M.,ALBA Synchrotron Light Facility | And 4 more authors.
Journal of Physics: Conference Series

Integrating UHV (ultra high vacuum) and superconducting magnets poses special challenges to the magnet designer. A range of HTS (High Temperature Superconducting) magnets have been developed for UHV synchrotron beamline applications providing users with compact powerful cryogen-free solutions. Recent examples include HTS magnets for LARIAT (Large Area Rapid Imaging Analytical Tool) [8.5 T with 110 mm warm bore], X-ray scattering experiments at BESSY and LNLS [5-6 T with 110 degrees scattering angle aperture], X-ray magnetic circular dichroism, and resonant scattering experiments at ALBA. This paper will focus on the in-UHV HTS magnet installed at ALBA. © Published under licence by IOP Publishing Ltd. Source

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