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Bertrand Dutoit

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Related publications (45)

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Fast Quench Detection in SFCL Pancake Using Optical Fibre Sensing and Machine Learning

Bertrand Dutoit

A fast hotspot detection technique has been implemented and patented at ecole Polytechnique Federale de Lausanne (EPFL) under the European Union project FastGrid. The optical fibre sensing based technique uses the Mach-Zehnder Interferometer (MZI) and can ...

IEEE Institute of Electrical and Electronics Engineers2022

Thermally Assisted Transition in Thin Film Based FCL: A Way to Speed Up the Normal Transition Across the Wafer

Bertrand Dutoit, Bertrand Dutoit, Joseph Duron

The adjunction of constrictions along the meander of a superconducting Fault Current Limiter (FCL) greatly improves its behavior thanks to a better distribution of the dissipative zones at the occurrence of a short circuit. This design works perfectly for ...

IEEE Institute of Electrical and Electronics Engineers2007

Feasibility Study of GaToroid Gantries for Carbon Ions

Bertrand Dutoit, Bertrand Dutoit, Enrico Felcini

The use of carbon ions in particle therapy can enhance the treatment quality, introducing higher biological effectiveness compared to photons and protons. Rotating gantries are nowadays used to deliver particle beams from different directions to obtain pre ...

IEEE Institute of Electrical and Electronics Engineers2022

Fast Hotspot Detection in SFCLs by Exploiting Strain Response in Optical Fiber Sensing

Luc Thévenaz, Bertrand Dutoit, Zhisheng Yang, Bertrand Dutoit, Nicolo' Riva, Arooj Akbar

Superconducting fault current limiters (SFCLs) can be used to limit fault currents in both meshed DC and AC grids by transitioning from superconducting to resistive state, in the presence of high currents. While the device is theoretically a great way to p ...

IEEE Institute of Electrical and Electronics Engineers2021

Inhomogeneity effects in HTS coated conductors used as resistive FCLs in medium voltage grids

Bertrand Dutoit, Bertrand Dutoit, Daniele Colangelo

For resistive fault current limiters (RFCLs) based on high temperature superconducting coated conductors (HTS-CCs), inhomogeneity, in terms of critical current and geometrical imperfections such as stabilizer and substrate thicknesses, plays a very importa ...

IOP Publishing Ltd2012

Impact of the Normal Zone Propagations Velocity of High Temperature Superconducting Coated Conductors on Resistive Fault Current Limiters

Bertrand Dutoit, Bertrand Dutoit, Daniele Colangelo

The engineering critical current (Ic) of the high temperature superconducting coated conductors (HTS-CCs), today available on the market, is not a uniform parameter and varies significantly along the length of the conductors. Moreover, commercial HTS-CCs h ...

IEEE Institute of Electrical and Electronics Engineers2015

Computer Modeling of YBCO Fault Current Limiter Strips Lines in Over-Critical Regime With Temperature Dependent Parameters

Bertrand Dutoit, Bertrand Dutoit, Joseph Duron, Francesco Grilli

We present the results of an advanced numerical model for fault current limiter (FCL) based on HTS thin films in which both thermal and electromagnetic aspects are taken into account. This model allows simulating the behavior of FCL in the over-critical cu ...

IEEE Institute of Electrical and Electronics Engineers2007

Overcritical Current Resistivity of YBCO-Coated Conductors Through Combination of PCM and Finite-Element Analysis

Bertrand Dutoit, Bertrand Dutoit, Francesco Grilli, Nicolo' Riva

Understanding the electro-thermal behavior of high-temperature superconductor (HTS) materials is a critical aspect for designing efficient and reliable applications. In order to optimize cost and performance, one needs to understand the role played by the ...

IEEE Institute of Electrical and Electronics Engineers2019

Evaluation of the Applicability of Phenomenological HTS Models for Numerical Analysis of Quenches in Coated Conductors: Simulations vs. Experiments

Bertrand Dutoit, Bertrand Dutoit, Frédéric Sirois, François Roy

The electrical resistivity of coated conductors is strongly related to the inter-dependent set of parameters (J, H, T), respectively current density, magnetic field and temperature. On the one hand, it is difficult to isolate the contribution of each of th ...

IEEE Institute of Electrical and Electronics Engineers2011

Comparison of Numerical Methods for Modelling of Superconductors

Bertrand Dutoit, Bertrand Dutoit, Francesco Grilli

Different FEM formulations have been developed in order to model the electromagnetic behaviour of type II super-conductors. The paper presents a comparison between simulations with A-V formulation models implemented in two FEM software packages (FLUX2D and ...

Institute of Electrical and Electronics Engineers2002

Insulation effect on thermal stability of Coated Conductors wires in liquid nitrogen

Bertrand Dutoit, Bertrand Dutoit

Superconducting wires are not perfectly homogeneous in term of critical current as well as stabilization. In resistive fault current limiter applications this could lead to hot spots if the fault current is only slightly above the nominal current of the de ...

Iop Publishing Ltd2017

Magneto-Thermal Modeling of Second-Generation HTS for Resistive Fault Current Limiter Design Purposes

Bertrand Dutoit, Bertrand Dutoit, Francesco Grilli, Frédéric Sirois, François Roy

Coated conductors are very promising for the design of novel and efficient resistive Fault Current Limiters (FCLs). However, a detailed knowledge about their thermal and electromagnetic behaviors in the presence of over- critical currents is crucial for th ...

IEEE Institute of Electrical and Electronics Engineers2008

Heat transfer monitoring between quenched high-temperature superconducting coated conductors and liquid nitrogen

Bertrand Dutoit, Bertrand Dutoit, Daniele Colangelo

High-temperature superconducting coated conductors (HTS-CCs) are good candidates for resistive superconducting fault current limiter (RSFCL) applications. However, the high current density they can carry and their low thermal diffusivity expose them to the ...

2015

Numerical studies of the quench propagation in coated conductors for Fault Current Limiters

Bertrand Dutoit, Bertrand Dutoit, Frédéric Sirois, François Roy

A fundamental understanding of the quench phenomenon is crucial in the future design and operation of HTS based Fault Current Limiters (FCLs). The key parameter that quantifies the quenching process in superconductors is the normal zone propagation (NZP) v ...

IEEE Institute of Electrical and Electronics Engineers2009

The geometrical edge barrier in type I superconductors

Bertrand Dutoit, Bertrand Dutoit

The magneto-optical technique was used to study the edge barrier for flux entry in type I superconducting strips (In, Pb). The width of the flux-free zones appearing at the sample edges, due to the barrier, was measured at different applied fields and temp ...

Elsevier1997

Optimization Method for Extracting Stabilizer Geometry and Properties of REBCO Tapes

Bertrand Dutoit, Bertrand Dutoit, Francesco Grilli, Nicolo' Riva, Arooj Akbar

A good knowledge of material properties is a critical aspect for modeling high-temperature superconductor (HTS) devices. However, the electrical resistivity of coated conductors above the critical current is limited. The major challenge in characterizing t ...

2021

Experimental study of the geometrical barrier in type-I superconducting strips

Bertrand Dutoit, Bertrand Dutoit

We study the energy barrier for flux entry of a geometric origin in type-I superconducting strips using magneto-optical observations of the flux structure. The magnetic field is applied perpendicularly to the broad surface and, optionally, a dc current is ...

1999

Design of the First HTS Single-Coil Demonstrator of GaToroid Toroidal Gantry for Hadron Therapy

Bertrand Dutoit, Bertrand Dutoit, Enrico Felcini

The design and construction of compact and lightweight gantries for hadron therapy are essential steps toward wider accessibility to this cancer treatment. The use of a high-field steady-state toroidal gantry, i.e., GaToroid, represents an attractive alter ...

IEEE Institute of Electrical and Electronics Engineers2021

Can Resistive-Type Fault Current Limiter Operate in Cryogen-Free Environment?

Bertrand Dutoit, Bertrand Dutoit

Superconducting fault current limiters are unique devices that offer fast response to fault without need of an external triggering system. Therefore, they are interesting for industrial use, although their price is high. The principle of the resistive faul ...

IEEE Institute of Electrical and Electronics Engineers2016

Impact of Inhomogeneities in HTS Coated Conductors for Resistive FCLs

Bertrand Dutoit, Bertrand Dutoit, Frédéric Sirois, Daniele Colangelo

Several issues remain to be addressed for the commercial development of ResistiveFault Current Limiters based on superconducting technologies (RFCL). In particular, the inhomogeneity of high temperature superconducting coated conductors (HTS-CC) combined w ...

Elsevier Science Bv2011