Concept

Appareillage électrique

Publications associées (21)

Positive Streamer Initiation in SF6/CO2 Based on Zener's Field Ionization

In this study, experiments were performed to measure the inception and breakdown voltages of SF6/CO2 mixed gases with varying mixing ratios at two different pressures (1 and 2 bar). Using the preliminary data obtained from the experiments, a 3D particle mo ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2023

Vacuum Circuit Breaker Closing Time Key Moments Detection via Vibration Monitoring: A Run-to-Failure Study

Olga Fink, Gaëtan Michel Frusque

Circuit breakers (CBs) play an important role in modern society because they make the power transmission and distribution systems reliable and resilient. Therefore, it is important to maintain their reliability and to monitor their operation. A key to ensu ...

2022

Partial discharge localization using time reversal: Application to gas insulated switchgear

Farhad Rachidi-Haeri, Marcos Rubinstein, Hamidreza Karami

Gas-insulated switchgear (GIS) are some of the most reliable and most expensive equipment that are nowadays used in power systems. Condition monitoring of the power system equipment can help operators detect defects like partial discharges (PDs) early, pre ...

Elsevier2022

Metal-wire-embedded alumina insulating material using micro- and nanoscale 3D printing for surface flashover mitigation in a vacuum

Guang-Yu Sun

A micro- and nanoscale 3D printing technique is applied to fabricate a functional insulating material that mitigates surface discharge in a vacuum based on microscopic electron multipactor suppression. The proposed alumina ceramic insulator design consists ...

2022

Partial discharge localization using time reversal: application to power transformers and gas-insulated substations

Marcos Rubinstein, Mohammad Azadifar, Farhad Rachidi-Haeri, Amirhossein Mostajabi, Hamidreza Karami

A method for locating one or multiple partial discharge sources in a power transformer or a Gas-Insulated Substation, whereby the partial discharges emit electromagnetic and acoustic waves, the method comprising recording a signal corresponding to the wave ...

2021

Three-Dimensional FDTD-Based Simulation of Induced Surges in Secondary Circuits Owing to Primary-Circuit Surges in Substations

Farhad Rachidi-Haeri, Marcos Rubinstein, Akiyoshi Tatematsu

Currently, plenty of sensitive electronic devices are installed in secondary circuits in substations and power plants. Electronic devices may malfunction and become damaged owing to electromagnetic disturbances caused mainly by lightning surges. To protect ...

2021

Ultra High Voltage Switch for Bidirectional DC-DC Converter Driving Dielectric Elastomer Actuator

Yves Perriard, Yoan René Cyrille Civet, Morgan Almanza, Lucas Pniak

Specific applications, such as dielectric elastomer actuators (DEAs) or electroactive polymers, require to switch voltage levels exceeding the ratings of existing semiconductor devices. In low power application, reversible flyback are widely used to supply ...

2020

Swiss Competence Center on Energy Research FURIES - Overview and Contributions in the Area of Power Electronics and Smart Grids

Mario Paolone, Drazen Dujic, Farhad Rachidi-Haeri, Milan Utvic, Reza Razzaghi, Stefan Milovanovic, Alexandre François Christe, Jin Wang, Mauro Carpita

This paper introduces a special session on results of the Swiss competence center on energy research FURIES that has been established in coordination with the Swiss Energy strategy 2050 with the specific aim to develop, promote and deploy power grid-relate ...

2019

Vacuum circuit breaker modelling for the assessment of transient recovery voltages: Application to various network configurations

Mario Paolone, Carlo Alberto Nucci

Vacuum circuit breakers (VCBs) are widely used for medium voltage applications when low maintenance, long operating life, and large number of allowable switching cycles are required. The accurate estimation of the transient recovery voltages (TRVs) associa ...

Elsevier2018

Implantable electrode and method for manufacturing

Diego Ghezzi, Marta Jole Ildelfonsa Airaghi Leccardi

The invention relates to a method for manufacturing an electrode, preferably an implantable electrode array comprising the following steps: Applying (101) a layer of electrically conducting material (4) above a substrate material (1) for forming the electr ...

2018

Study of the Hot-Spot Temperature During Quench in the Nonplanar Coils of W7-X

Pierluigi Bruzzone, Kamil Sedlák

The quench protection system of the nonplanar coils of the Wendelstein 7-X stellarator was laid out over 15 years ago. At that time, the assessment of the hot-spot temperature by a basic adiabatic model was done using design values for material and operati ...

IEEE Institute of Electrical and Electronics Engineers2018

Measurements and modelling of residual stresses during quenching of thick heat treatable aluminium components in relation to their precipitation state

Nicolas Paul Henry Chobaut

In the fabrication of heat treatable aluminium parts, solutionising and quenching are key steps in order to obtain the required mechanical characteristics. Fast quenching is necessary to avoid coarse precipitation as this one reduces the mechanical propert ...

EPFL2015

Construction and test of a non-insulated insert coil using coated conductor tape

Pierluigi Bruzzone, Davide Uglietti, Rainer Wesche

A small coated conductor coil (central field 1 T at 200 A) was constructed and tested in order to evaluate the benefit and the possible disadvantages of non insulated, double pancake construction, in particular regarding quench protection. The insert coil ...

Iop Publishing Ltd2014

Hybrid stretchable circuits on silicone substrate

Stéphanie Lacour

When rigid and stretchable components are integrated onto a single elastic carrier substrate, large strain heterogeneities appear in the vicinity of the deformable-non-deformable interfaces. In this paper, we report on a generic approach to manufacture hyb ...

American Institute of Physics2014

A Versatile DC-DC Converter for Energy Collection and Distribution using the Modular Multilevel Converter

Alfred Rufer, Drazen Dujic, Stephan Kenzelmann, Michail Vasiladiotis

The drawbacks of conventional Modular Multilevel Converters (MMC) are described in terms of short-circuits. The configuration of MMC-transformer-MMC proves to handle short-circuits at the input and output without the need for additional DC or AC circuit br ...

Ieee2011

A versatile DC/DC converter based on Modular Multilevel Converter for energy collection and distribution

Alfred Rufer, Stephan Kenzelmann, Drazen Dujic

A topology based on the Modular Multilevel Converter (MMC) is presented, using two MMC linked by a medium frequency transformer. The back to back structure proves to have effective circuit breaker properties and reduced passive components. Due to the adopt ...

2011

Integrated SMD pressure/flow/temperature multisensor for compressed air in LTCC technology: Thermal flow and temperature sensing

Peter Ryser, Thomas Maeder, Yannick Sébastien Fournier, Nicolas Craquelin, Jean-Bastien Coma

In this work, we present and analyse the flow-sensing part of a recently-developed multisensor in LTCC (low- temperature co-fired ceramic) technology; this device integrates flow / pressure / temperature sensing and is designed for diagnostics monitoring o ...

Elsevier2011

A DC Hybrid Circuit Breaker With Ultra-Fast Contact Opening and Integrated Gate-Commutated Thyristors (IGCTs)

Alfred Rufer

Air-magnetic circuit breakers are widely used for short-circuit protection in dc electric railways or industrial plants. The well-known drawbacks of these breakers are mainly a slow breaking action, a short lifetime, and high maintenance costs due to the d ...

2006

In situ characterization of impedance mismatch in a medium voltage network

Farhad Rachidi-Haeri

An in situ methodology is proposed to characterize the impedance mismatch at each power line communication transmission port in medium voltage network. Based on path loss and impedance measurements, a complete characterization of a non energized medium vol ...

2005

New hybrid circuit breaker/current limiter with serial and parallel commutation assistance

This paper presents a new hybrid circuit breaker topology based on the use of serial and parallel semiconductors that allows to increase the supply voltage and default current with no arc, and to benefit from a current limitation function. A concrete marin ...

2004