Publications by Bertrand Dutoit

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

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

Feasibility Study of GaToroid Gantries for Carbon Ions

Bertrand Dutoit, Bertrand Dutoit, Luca Bottura, 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

Optical fibre based quench detection in HTS applications using machine learning classifiers

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

A Mach-Zehnder Interferometer (MZI) based optical fibre sensing technique, developed and patented by EPFL, is an efficient and economical way to detect hotspots in High Temperature Superconductor (HTS) applications. Due to the MZI sensitivity being a compo ...

Elsevier2022

Optimization Method for Extracting Stabilizer Geometry and Properties of REBCO Tapes

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

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

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

Bertrand Dutoit, Bertrand Dutoit, Luca Bottura, Enrico Felcini, Jérôme Harray

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

Superconductors for power applications: an executable and web application to learn about resistive fault current limiters

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

High-temperature superconductors (HTS) can be superconducting in liquid nitrogen (77 K) at atmospheric pressure, which holds immense promises for our future such as nuclear fusion, compact medical devices and efficient power applications. In a power system ...

2021

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

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

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

Optimization Method for Extracting Stabilizer Geometry and Properties of REBCO Tapes

Bertrand Dutoit, Arooj Akbar, Nicolo' Riva

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

IEEE Institute of Electrical and Electronics Engineers2021

Optical fibre sensing for fast hotspot detection in SFCLs

Bertrand Dutoit, Luc Thévenaz, Bertrand Dutoit, Arooj Akbar, Zhisheng Yang, Sheng Wang

The health monitoring of superconducting fault current limiters (SFCL) is important for their large-scale exploitation in HVDC grids protection. The intrinsic non-homogeneity of critical current along the superconductor length can cause localized points of ...

2020

Magnetic Design of a Superconducting Toroidal Gantry for Hadron Therapy

Bertrand Dutoit, Bertrand Dutoit, Luca Bottura, Enrico Felcini

Hadron and proton therapy are cutting edge techniques for cancer treatment and a great development of specialized medical centers and research facilities is foreseen in the next decades. One of the main obstacles to the penetration of the use of charged pa ...

IEEE Institute of Electrical and Electronics Engineers2020

Resistivity of REBCO tapes in overcritical current regime: impact on superconducting fault current limiter modeling

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

A detailed knowledge of the resistivity of high-temperature superconductors in the overcritical current regime is important to achieve reliable numerical simulations of applications such as superconducting fault current limiters. We have previously shown t ...

2020

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

Status of the European Union Project FASTGRID

Bertrand Dutoit, Bertrand Dutoit, Mathias Noe, Frédéric Sirois

High voltage direct current super-grids are one attractive solution for the transmission of bulk power of renewable electricity over long distances. Their protection is still an issue and superconducting fault current limiters (SCFCL) offer attractive pers ...

IEEE Institute of Electrical and Electronics Engineers2019

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

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 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

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

Analysis of the influence of the normal zone propagation velocity on the design of resistive fault current limiters

Bertrand Dutoit, Bertrand Dutoit, Daniele Colangelo

Commercial high-temperature superconducting coated conductors (HTS-CCs) have low thermal diffusivity and nonuniform critical current density. These two factors lead commercial HTS-CCs to a partial quench when they are subjected to a transport current aroun ...

Iop Publishing Ltd2014

Design and Production of the ECCOFLOW Resistive Fault Current Limiter

Bertrand Dutoit, Bertrand Dutoit

The European project ECCOFLOW aims at a versatile resistive-type superconducting fault current limiter. For the first time, such a device will be tested at two different sites. The project partners have developed a superconducting fault current limiter des ...

IEEE Institute of Electrical and Electronics Engineers2013

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 ...

Institute of Physics2012