References of "Lilien, Jean-Louis"
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See detailEffets sur les êtres humains des champs électromagnétiques à très basse fréquence
Lilien, Jean-Louis ULg; Dular, Patrick ULg; V Sabariego, Ruth ULg et al

in REE : Revue de l'Electricité et de l'Electronique (2010), 5

Depuis le début des années 70, le risque potentiel sur la santé lié à l’exposition aux champs électromagnétiques dit à extrêmement basse fréquence a été largement abordé par la littérature scientifique ... [more ▼]

Depuis le début des années 70, le risque potentiel sur la santé lié à l’exposition aux champs électromagnétiques dit à extrêmement basse fréquence a été largement abordé par la littérature scientifique (plus de 1000 références répertoriées par l’OMS (WHO, 2007). Après plus de trente années de recherches au niveau mondial, il ressort principalement des études épidémiologiques une augmentation possible et modeste de l’accroissement du risque (d’un facteur 2) de la leucémie infantile en cas d’exposition répétée à un champ d’induction magnétique (B) supérieur à 0,4 T (micro-Tesla). Cependant cette observation n’a pu être confirmée par des études in vivo ou in vitro : aucun mécanisme biologique pathogène plausible n’a pu être mis à jour. La Commission Internationale pour la Protection contre les Radiations Non-Ionisantes (ICNIRP) recommande à ce jour des seuils, pour le grand public, situés à 100 T (champ d’induction magnétique B à 50 Hz) et 5 kV/m (champ électrique E à 50 Hz). Dans ce document nous présentons d’abord une revue des valeurs typiques de champs à 50 Hz auxquels nous sommes exposés, suivi d’un résumé de la littérature liant leucémie infantile et champs électromagnétiques à extrêmement basse fréquence (ELF). L’effet carcinogène potentiel sera lié à un seuil de perturbation électrique au niveau de la cellule. Nous nous intéresserons de près à la réponse de la moelle osseuse aux champs ELF. Dans ce but, nous ciblons le potentiel transmembranaire et l’impact sur celui-ci du champ électrique interne au corps. Ce papier est divisé en trois parties : (1) les interactions électriques entre les champs ELF ambiants et le corps humain de manière qualitative et quantitative. Différentes sources de champ électrique interne sont classifiées avec leur risque. (2) Parmi ces sources, nous détaillerons l’hypothèse des courants de contact ; (3) enfin quelques actions sont proposées pour les installations privées, de manière à annihiler la source potentielle majeure des effets des champs ELF. [less ▲]

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See detailGalloping Conductors
Lilien, Jean-Louis ULg; Havard, Dave; Van Dyke, Pierre

in Chan, John (Ed.) EPRI Transmission Line Reference Book : Wind-Induced Conductor Motion (2009)

The chapter describes galloping of overhead conductors. It includes an overview on the phenomenon, with information on its characteristics, types of galloping, damage resulting from it, and causes. The ... [more ▼]

The chapter describes galloping of overhead conductors. It includes an overview on the phenomenon, with information on its characteristics, types of galloping, damage resulting from it, and causes. The chapter also covers the mechanisms of galloping and reviews protection methods. [less ▲]

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See detailShort-circuit forces in power lines and substations.
Lilien, Jean-Louis ULg; Goel, Anand

in Chan, John (Ed.) EPRI Transmission Line Reference Book : Wind-Induced Conductor Motion (2009)

This chapter discusses short-circuit oscillations in power lines. Short-circuit currents generate electromagnetic forces on the conductors, exciting short-circuit oscillations. Since the short-circuit ... [more ▼]

This chapter discusses short-circuit oscillations in power lines. Short-circuit currents generate electromagnetic forces on the conductors, exciting short-circuit oscillations. Since the short-circuit periods are very short, the short-circuit forces in single conductor overhead lines are usually low because of the large phase spacing. However these forces may have considerable impact on distribution lines due to the change in phase spacing during short-circuit occurrences. For bundle conductor lines, the short-circuit forces between subconductors are significantly higher due to the small distance between them. Methods for estimating the compressive forces on bundle conductor spacers or spacer dampers are discussed. [less ▲]

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See detailEffects of extremely low frequency electromagnetic fields (ELF) on human beings
Lilien, Jean-Louis ULg; Dular, Patrick ULg; V Sabariego, Ruth ULg et al

in International Colloquium on Power frequency electromagnetic fields ELF EMF, Sarajevo, Bosnia and Herzegovina (2009)

A rough overview of typical values of ELF fields will be presented followed by a brief literature survey on childhood leukaemia and ELF. The potential carcinogenic effect of ELF would be linked to ... [more ▼]

A rough overview of typical values of ELF fields will be presented followed by a brief literature survey on childhood leukaemia and ELF. The potential carcinogenic effect of ELF would be linked to electrical disturbances in cell behaviour. The major concern linking childhood leukaemia and ELF is thus to determine the response of bone marrow cells under ELF fields. With that purpose, transmembrane potential will be targeted and linked to the E-field at that level. [less ▲]

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See detailEPRI Transmission Line Reference Book : wind-induced Conductor Motion.
Chan, John; Havard, Dave; Rawlins, Chuck et al

Book published by EPRI - second edition (2009)

This book summarize worldwide knowledge on power line conductor wind-induced movements, including :- aeolian vibrations; - Fatigue of Overhead conductors; - Galloping; - bundle conductor oscillations ... [more ▼]

This book summarize worldwide knowledge on power line conductor wind-induced movements, including :- aeolian vibrations; - Fatigue of Overhead conductors; - Galloping; - bundle conductor oscillations; - overhead fiber optic cables; - other motions. [less ▲]

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See detailVIBRATIONS OF A SHORT SPAN, COMPARISON BETWEEN MODELIZATION AND MEASUREMENTS PERFORMED ON A LABORATORY TEST SPAN
Guérard, Suzanne ULg; Lilien, Jean-Louis ULg; Van Dyke, Pierre

in Lilien, Jean-Louis (Ed.) EIght International symposium on Cable Dynamics, ISCD 2009 (2009)

In the first part of the present paper, experiments carried out on IREQ laboratory cable test bench were described. One of the objectives of these experiments was to collect all the required data to ... [more ▼]

In the first part of the present paper, experiments carried out on IREQ laboratory cable test bench were described. One of the objectives of these experiments was to collect all the required data to validate the modelization of this cable test bench vibrating at its eigen frequencies. Conductor excitation was performed by a vibration shaker. In the present paper, the first modelization results are presented. The model used is a beam element model, with an average value of conductor bending stiffness. For certain of the simulations, some material damping was introduced through the use of a visco-elastic material. The vibration shaker is modelled by a harmonic force of adequate amplitude and location. The results obtained with this model put in evidence the impact of tension variations on such span length, which makes it difficult to obtain a resonance. Also, computed mode shapes are in good agreement with the reality, and time response of the model with a concentrated mass enabled us to reproduce some interesting observed phenomena. [less ▲]

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See detailEvaluation of power line cable fatigue parameters based on measurements on a laboratory cable test span
Guérard, Suzanne ULg; van dyke, Pierre; Lilien, Jean-Louis ULg

in Lilien, Jean-Louis (Ed.) EIght International symposium on Cable Dynamics, ISCD 2009 (2009)

The present paper describes experiments carried out on IREQ laboratory cable test bench. Test span arrangement is a 63.15m cable span with termination ends designed so as to minimize energy dissipation. A ... [more ▼]

The present paper describes experiments carried out on IREQ laboratory cable test bench. Test span arrangement is a 63.15m cable span with termination ends designed so as to minimize energy dissipation. A shaker provides a vertical alternating force to the conductor. During the experiments, a maximum of information on mode shape is collected: location of nodes, antinode amplitude of vibration, relative displacement at 44.5, 89, and 178mm from the last point of contact with the metallic clamp. Several configurations are studied: span equipped with an homogeneous steel cable, span equipped with an ACSR Crow conductor, sometimes in combination with other equipments such as a vibration damper or a local mass, to investigate how the presence of such devices impacts conductor vibrations. It results from these experiments an interesting comparison of two widely used fatigue indicators, the relative displacement Yb 2 (also called “bending amplitude”) and fymax (the product of antinode amplitude of vibration by frequency). Also, collected data gives indirect information on conductor variable bending stiffness. [less ▲]

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See detailPerturbation finite element method for the analysis of earthing systems with vertical and horizontal rods
V Sabariego, Ruth ULg; Ferreira da Luz, Mauricio V.; Nzuru Nsekere, Jean-Pierre et al

in Proceedings of the 6ème Conférence Européenne sur les Méthodes Numériques en Electromagnétisme (NUMELEC2008) (2008, December)

This paper deals with the electrokinetic modeling of earthing systems by means of a sub-domain perturbation finite element technique. An axisymmetric problem is solved for each single grounding rod or ... [more ▼]

This paper deals with the electrokinetic modeling of earthing systems by means of a sub-domain perturbation finite element technique. An axisymmetric problem is solved for each single grounding rod or cable. Its solution must then be corrected by taking into account the influence of the other rods and cables. The electric scalar potential is transferred from one problem to the other through projections between meshes. An inherently 3D problem can thus be solved as a succession of 2D sub-problems, which significantly speeds up the solution and enables to tackle complicated grounding systems. [less ▲]

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See detailModélisation numérique des courants et tensions de contact dans des habitations
Lorphèvre, Raoul; Dular, Patrick ULg; V Sabariego, Ruth ULg et al

in Actes de 6ème conférence européenne sur les méthodes numériques en électromagnétisme (NUMELEC 2008) (2008, December)

Un modèle d’installation électrique d’habitation avec une ligne à haute tension est développé avec la méthode "Partial Element Equivalent" (PEEC). Cette étude a pour but de déterminer l’existence des ... [more ▼]

Un modèle d’installation électrique d’habitation avec une ligne à haute tension est développé avec la méthode "Partial Element Equivalent" (PEEC). Cette étude a pour but de déterminer l’existence des courants et tensions induits dans une maison et d’évaluer leur amplitude. Ensuite, nous caractérisons l’influence d’un réseau d’habitations et du type de prise de terre sur ceux-ci. Cette partie du travail nous permet d’obtenir un ensemble de facteurs influençant le niveau des courants induits. Ce papier montre qu’il est possible de déterminer des configurations pour minimiser ces courants dans un réseau d’habitations. [less ▲]

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See detailPerturbation finite element method for the analysis of earthing systems with vertical rods
V Sabariego, Ruth ULg; Ferreira da Luz, Mauricio V.; Nsekere, Jean-Pierre et al

in Proceedings of MOMAG2008 (2008, September)

This paper deals with the electrokinetic modeling of earthing systems by means of a sub-domain perturbation finite element technique. An axisymmetric problem is solved for each single grounding rod. Its ... [more ▼]

This paper deals with the electrokinetic modeling of earthing systems by means of a sub-domain perturbation finite element technique. An axisymmetric problem is solved for each single grounding rod. Its solution must then be corrected by taking into account the influence of the other rods. The electric scalar potential is transferred from one problem to the other through projections between meshes. An inherently 3D problem can thus be solved as a succession of 2D sub-problems, what significantly speeds up the solution and enables to tackle complicated grounding systems. The method is validated by means of both analytical formulas and 3D computations. [less ▲]

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See detailEffects of extremely low frequency electromagnétic fields (ELF) on human beings. An electrical engineer viewpoint.
Lilien, Jean-Louis ULg; Dular, Patrick ULg; V Sabariego, Ruth ULg et al

in Revue d'électricité et d'électronique industrielle - tijdschrift voor elektriciteit en industriele elektronika (2008), 3

Since the early seventies, potential health risks from Extremely Low Frequency (ELF) exposure (50 Hz) have been extensively treated in the literature (more than 1000 references registered by WHO1, 2007 ... [more ▼]

Since the early seventies, potential health risks from Extremely Low Frequency (ELF) exposure (50 Hz) have been extensively treated in the literature (more than 1000 references registered by WHO1, 2007). After 30 years of worldwide research, the major epidemiological output is the possible moderate increased risk (by a factor 2) of childhood leukaemia in case of a long exposure to an ambient magnetic flux density (B-field) higher than 0.4 μT. However, this fact has not been confirmed by in vivo and/or in vitro studies. Moreover it has not been validated by any adverse health biological mechanisms neither for adults nor for children. Nobody knows precisely what happens inside the body and what could be a hazardous health effect of the ELF fields at 50 Hz. International recommendations (ICNIRP2) are currently, for general public, not to exceed a B-field of 100 μT (50 Hz) and an E-field of 5 kV/m (50 Hz). The authors are looking for a signal generated in the biological process under electric interactions. Herein, a rough overview of typical values of ELF fields will be presented followed by a brief literature survey on childhood leukaemia and ELF. The potential carcinogenic effect of ELF would be linked to electrical disturbances in cell behaviour. The major concern linking childhood leukaemia and ELF is thus to determine the response of bone marrow cells under ELF fields.With that purpose, transmembrane potential will be targeted and linked to the E-field at that level. This paper is three-folded: First, the electric interactions between ambient ELF fields and the body are studied both qualitatively and quantitatively. Though no adverse health field threshold is defined, a minimum field level is fixed in order to discriminate inherent random noise, in agreement with NIEHS3. This is based on the fact that mechanisms become only plausible under field exposure above a certain strength. Different sources of internal E-field are analysed and classified according to their potential risk. Second, the hypothesis of contact current is detailed. Finally, key actions to undertake are highlighted. Based on the current state of the art and some authors’ own developments, this paper proposes simple low cost modifications of private electrical installations in order to annihilate the major source of potential effects of ELF. Particular emphasis is paid to the situation in Belgium as the authors are part of the BBEMG (see end note) and perform numerous measurements in Belgian residential homes. [less ▲]

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See detailAeolian vibrations on High Voltage Lines .Comparative self damping as evaluated on the field
Lilien, Jean-Louis ULg; Destiné, Jacques ULg; Gillis, Jean-Marie ULg et al

(2008, August)

New ways to measure continuously in real time, aeolian vibrations.

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See detailNew trends on real time measurement on power lines : application to ampacity, aeolian vibrations and others
Lilien, Jean-Louis ULg

Conference given outside the academic context (2008)

new trends in real time monitoring onpower lines using mycrosystems

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See detailPerformance assessment of a 5 kW SOFC cogeneration fuel cell
Lerson, sébastien; Lilien, Jean-Louis ULg; Minne, Gael

in International Journal of Environmental Technology & Management (2008), 9(4), 426-433

A 5 kW SOFC (Solid Oxyde Fuel Cell) performance will be detailed. This kind of cogeneration, a typical one for residential application, will be able to replace actual boiler in most of applications. The ... [more ▼]

A 5 kW SOFC (Solid Oxyde Fuel Cell) performance will be detailed. This kind of cogeneration, a typical one for residential application, will be able to replace actual boiler in most of applications. The combination of high temperature hot water output combined with grid-tie electricity delivery will progressively replace actual systems. This will help to significantly reduce GHG (green house gas) emission to about 20% , even compared to actual emissions, based on high performance boiler and electricity produced by high efficiency combined cycle. The particular benefit of SOFC compared to other technologies of fuel cell is the high temperature from one side (giving access to appropriate hot water for heating purposes) and the very exciting high electricity efficiency which is over 40%, together with a global efficiency measured over 80%. This paper is analysing an existing 5 kW unit SOFC which has shown such high level efficiencies [less ▲]

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See detailA kinematic model for hysteretic dissipation of vibration energy for torsional damper and detuner.
Danilin, Alexander; Vinogradov, Alexander; Lilien, Jean-Louis ULg

in Lilien, Jean-Louis (Ed.) Proceedings of the 7th International Conference on Cable Dynamics (2007, December)

A description of the damping properties and model of a low frequency damper for power lines galloping.

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See detailNonlinear Aeroelastic vibrations and galloping of iced conductor lines under wind.
Shklyarchuk, Fedor; Danilin, Alexander; Lilien, Jean-Louis ULg et al

in Proceedings of the 7th International Conference on Cable Dynamics (2007, December)

galloping model for one span single conductor dead ended.

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See detailState of the art of conductor galloping
Lilien, Jean-Louis ULg

Book published by CIGRE - document prepared by CIGRE Task Force B2.11.06 (2007)

Galloping is a low frequency, high amplitude wind induced vibration of both single and bundle conductors, with a single or a few loops of standing waves per span. Galloping has a major impact on the ... [more ▼]

Galloping is a low frequency, high amplitude wind induced vibration of both single and bundle conductors, with a single or a few loops of standing waves per span. Galloping has a major impact on the design of overhead lines, for both clearances and tower loadings. This book is giving an actualized state of the art of the phenomenon, the mechanisms and ways to control it. Based on observations in worldwide countries, new trends for galloping amplitudes and fatigue mechanisms associated are detailed. [less ▲]

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See detailLe galop des conducteurs. Etat de l'art.
Lilien, Jean-Louis ULg

in Electra (2007), 232

Power line galloping is a large vibration (up to the sag) at very low frequency (fraction of Hz) occuring on power line spans under heavy wind and cold temperature, with ice/snow deposit. Galloping is due ... [more ▼]

Power line galloping is a large vibration (up to the sag) at very low frequency (fraction of Hz) occuring on power line spans under heavy wind and cold temperature, with ice/snow deposit. Galloping is due to aerodynamic or aeroelastic instability. It may cause dramatic damages on conductor, hardware and towers. [less ▲]

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See detailDevice, system and method for real-time monitoring of overhead power lines
Lilien, Jean-Louis ULg; Destiné, Jacques ULg

in International Application published under the patent cooperation treaty (PCT) (2007)

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See detailHypersensitivity to Electricity: The effect of the current waveform on the perception level
Mattivi, Brice; Beauvois, Véronique ULg; Dular, Patrick ULg et al

in Proceedings of the 4th Int Workshop on Biological Effects of Electromagnetic Fields (2006, October)

Hypersensitivity to electricity has been reported many times in the literature. From another point of view, numerous measurements have been performed on perception level. Even if it appears that part of ... [more ▼]

Hypersensitivity to electricity has been reported many times in the literature. From another point of view, numerous measurements have been performed on perception level. Even if it appears that part of the population has a lower perception level of current, there is no clear link with the so called “hypersensitivity to electricity” which is more related to declared physiological disorders in part of the population (sleeping problem, headache ...). Such declared hypersensitivity is currently not yet related to any biological parameter. Our research team is currently trying to determine a relationship between hypersensitive declared people and the perception level when injecting current in the low frequency range 50-1000 Hz. We have performed current perception tests with individuals under different conditions (different wave shapes, frequencies, influence of external electric field, male and female...) using a particular protocol and our own designed system for current injection. This paper will present our test system design (current injector, wave shape converter, safety aspects) and our first results based on both sine wave (different frequencies) and wide band signal. [less ▲]

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