Valerio Rossi

CESI, Milano, Lombardy, Italy

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Publications (10)3.6 Total impact

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    ABSTRACT: Ricerca sul Sistema Energetico S.p.A. (RSE) has been gaining a relevant experience in the simulation, design and installation of resistive-type Superconducting Fault Current Limiter (SFCL) devices for more than five years in the framework of a R&D national project funded by the Ricerca di Sistema (RdS). The most recent outcome of this research activity is the installation of a resistive-type BSCCO-based 9 kV / 3.4 MVA SFCL device in a single feeder branch of the Medium Voltage (MV) distribution network managed by A2A Reti Elettriche S.p.A (A2A) in the Milano area. This installation represents the first SFCL successfully installed in Italy. In this paper, we report on the main outcomes after a more than 1-year long steady-state field testing activity. The design of an upgraded device to be installed in the same substation has already been initiated: the new SFCL will allow to protect four different feeders, therefore implying a device upgrade up to 15.6 MVA.
    Journal of Physics Conference Series 05/2014; 507(3):032003.
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    ABSTRACT: Since 2009, Ricerca sul Sistema Energetico S.p.A. has been involved in the development of a resistive-type superconducting fault current limiter (SFCL) for MV applications to be installed in the A2A Reti Elettriche S.p.A. distribution grid in the Milan area. The project started with simulations, design, and testing activities for a single-phase device; this first step paved the way for developing, testing, and live-grid installation at the hosting utility site of the final three-phase SFCL prototype. The result of this research activity is a resistive-type 9 kV/3.4 MVA SFCL device, based on first-generation (1G) BSCCO tapes, nowadays permanently installed as a single-feeder fault protection. This device is the first SFCL successfully installed in Italy. In this paper, we report on installation of the three-phase device and field-testing activity. The next step of the R&D activity will consist in the design of a three-phase SFCL demonstrator 9 kV/15.6 MVA to be installed at the same substation in an incoming feeder to limit the contribution of this feeder to the total short-circuit current of the network. This application is very demanding in terms of SFCL reliability and availability, but also the most interesting one for the A2A hosting utility needs.
    IEEE Transactions on Applied Superconductivity 01/2013; 23(3):5602504-5602504. · 1.20 Impact Factor
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    ABSTRACT: The Superconducting Fault Current Limiter (SFCL) is an innovative component able to limit instantaneously large short-circuit currents to acceptable level. In this paper we report on installation, commissioning and field testing of a SFCL prototype in a distributed generation Test Facility. Details of SFCL installation and of developed monitoring and acquisition system are described. Simulation results for 3 phase faults are compared with successful short-circuit field tests showing the good current-limiting capability and fast action of SFCL prototype.
    Electricity Distribution - Part 1, 2009. CIRED 2009. 20th International Conference and Exhibition on; 07/2009
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    ABSTRACT: A Life Cycle Assessment (LCA) study, according to ISO 14040 Standards, was carried out with the aim to compare the environmental performances of three 25 MVA transformers with different manufacturing characteristics: □ a high temperature superconducting (HTS) transformer with first generation (1G) BSCCO tape windings, □ a HTS transformer with second generation (2G) YBCO coated conductors windings, □ a conventional paper-oil insulated transformer with copper windings. A “from cradle to grave” approach was used for the comparative LCA. This paper reports the results of LCA with the identification of the most environmental-friendly solution and of the critical issues in the environmental profiles for the three different types of power transformers.
    Electricity Distribution - Part 1, 2009. CIRED 2009. 20th International Conference and Exhibition on; 07/2009
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    ABSTRACT: In the past, bismuth-based high temperature superconductors (HTS) was the only commercially available HTS conductors. The recent achievements in the production of MgB2 tapes and YBCO coated conductors (CC) persuaded us to study both these HTS as potential candidates for Superconducting Fault Current Limiter (SFCL) applications. In this work, we report on critical current measurements on MgB2 tapes and windings and YBCO CC at 4.2 K and in the temperature range 65–80 K, respectively. Results of electrical characterizations on MgB2 and YBCO specimens having different metallic matrix, are used in a numerical model able to predict the SFCL behaviour in view of their potential applications.
    Journal of Physics Conference Series 03/2008; 97(1):012285.
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    ABSTRACT: The growth in generation and the increased interconnection of electrical grids lead to higher fault currents and therefore there is a considerable interest in fault current limiter (FCL) devices. In this work, we refer on the results of electrical testing on resistive-type superconducting FCL prototypes made by Ni-sheathed MgB<sub>2</sub>, developed in the framework of the Italian Project LIMSAT. This is the first time ever that short circuit testing results are reported on MgB<sub>2</sub>-based FCL prototypes at 27 K, cooled by a liquid neon bath. The time evolution of limited current and voltage across SFCL prototypes are reported and analysed. Critical aspects associated to the fault event such as the steep HTS tape temperature rise and electrical insulation at cryogenic temperature are also discussed.
    IEEE Transactions on Applied Superconductivity 07/2007; · 1.20 Impact Factor
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    ABSTRACT: The Superconducting Fault Current Limiter (SFCL) is a novel component that will efficiently address the problems due to the increasing level of short-circuit currents in distribution networks. In this paper we summarize the short-circuit test results on a 1.2 MVA SFCL prototype and on a 200 kVA demonstrator, now installed in a test facility.
    04/2007;
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    ABSTRACT: The problem of excessive short-circuit currents has become an important issue for power systems operators and there are clear indications for a growing interest in superconducting fault current limiter devices for MV and HV grids. In this work, we report on both simulation and electrical testing on single-phase SFCL prototypes developed in the framework of an Italian RTD project to be completed with a 3-phase SFCL unit by the end of 2005.
    Journal of Physics Conference Series 07/2006; 43(1):925.
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    ABSTRACT: The problem of excessive short-circuit currents has become an important issue for power systems operators and there are clear indications for a growing interest in superconducting fault current limiter (SFCL) devices for MV and HV grids. In this work, we report on both simulation and electrical testing results on a 40 kVA single-phase SFCL prototype developed in the framework of an Italian RTD project to be completed with a 3-phase SFCL unit by the end of 2005.
    Electricity Distribution, 2005. CIRED 2005. 18th International Conference and Exhibition on; 07/2005
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    ABSTRACT: The Superconducting Fault Current Limiter (SFCL) is a device of particular interest to electricity companies since it is aimed to maintain fault current levels on electricity networks to acceptable values, i.e. within electrical component design limits. The use of high temperature superconductors (HTS) allows the fabrication of effective SFCL devices with different configurations. In this work, we report on simulations and electrical testing of resistive-type SFCL prototypes. Short-circuit testing of several HTS windings has been carried out at CESI facility. Prospective symmetrical and asymmetrical fault currents 40 times larger than the nominal current value have been applied for 40-160 ms on single-phase devices. As a result, the prospective peak short-circuit current of 4,5 kA has been effectively reduced to 300 A-800 A depending of applied voltage. Time evolution of limited current, voltage across SFCL prototypes, dissipated energy and heating phenomena are reported and discussed.
    IEEE Transactions on Applied Superconductivity 07/2005; · 1.20 Impact Factor