Personne

Francesco Grilli

Publications associées (33)

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2D Magneto-Thermal Modeling of Coated High-Temperature Superconductors

Francesco Grilli, Frédéric Sirois, François Roy, Bertrand Dutoit

Thin films are very promising for the design of novel and efficient Fault Current Limiter (FCL) made of high-temperature superconductors (HTS). However, their thermal and highly non-linear electromagnetic behavior in the presence of over-critical currents ...

COMSOL France2007

Finite-element modelling of superconductors in over-critical regime with temperature dependent resistivity

Francesco Grilli, Joseph Duron, Bertrand Dutoit

In this paper, we present a new numerical model, in which both the thermal and the electromagnetic aspects of the over-critical current regime of HTS materials are taken into account. The electromagnetic and thermal equations have been implemented in finit ...

2006

Finite-element analysis and comparison of the AC loss performance of BSCCO and YBCO conductors

Francesco Grilli, Bertrand Dutoit

The AC loss performance of two BSCCO and two YBCO conductors of different geometry, characterized by the same self-field critical current of 150 A, is analysed and compared quantitatively. The comparison is made using the finite-element method with a non-l ...

2006

This paper presents a quantitative comparison of the AC loss performance of two BSCCO and two YBCO conductors, characterized by the same self-field critical current of 150 A. In particular, compared are a 37-filamentary BSCCO tape, a 16-filamentary BSCCO s ...

2005

3D Finite Element Simulations of strip lines of a YBCO/Au Fault Current Limiter

Francesco Grilli, Joseph Duron, Bertrand Dutoit

Geometrical aspects of the design of fault current limiters (FCL) have a great impact on their performance. Recently, the University of Geneva have presented optimized geometries obtained by splitting the FCL into many small dissipative lengths in order to ...

2005

The performance of HTS devices is strongly influenced by local values of the current/field distributions. In this paper, we investigate the influence of the magnetic field and of the geometrical configuration on the loss behaviour of a 200kVA FCL prototype ...

2005

Dynamic field mapping for obtaining the current distribution in high-temperature superconducting tapes

Francesco Grilli, Joseph Duron, Bertrand Dutoit

The magnetic field profile on the surface of Bi-2223/Ag tapes has been dynamically measured across the width of the samples. The experimental technique uses a Hall-probe array with 7 sensors connected to a multiple channel lock-in amplifier especially prog ...

2005

This Ph.D. thesis is focused on the numerical modelling of high-Tc superconductors (HTS) at the operating temperature of 77 K (liquid nitrogen). The purpose of numerical modelling is to precisely calculate the current and field distributions inside HTS dev ...

EPFL2004

Modelling the E-J relation of high-Tc superconductors in an arbitrary current range

Francesco Grilli, Joseph Duron, Bertrand Dutoit

For describing the E-J relation of high-Tc superconductors (HTS) in power applications, where the applied current I is generally limited by Ic, the critical state model, a piecewise linear generalization, or a simple power-law of the type E=Ec(J/Jc)^n are ...

2004

Finite Element Method Modelling of Superconductors: from 2D to 3D

Francesco Grilli, Bertrand Dutoit

A 3D numerical modelling technique for solving problems involving superconducting materials is presented. The model is implemented in finite element method software and is based on a recently developed 3D formulation for general electro-magnetic problems w ...

2004