Arnaud ALLAIS - Academia.edu (original) (raw)
Papers by Arnaud ALLAIS
IEEE transactions on applied superconductivity, 2024
27th International Conference on Electricity Distribution (CIRED 2023)
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information), Dec 15, 2009
HAL (Le Centre pour la Communication Scientifique Directe), 2016
CIRED, Sep 20, 2021
"DC networks on Distribution Level – are they a new trend or a Vision?" That is the que... more "DC networks on Distribution Level – are they a new trend or a Vision?" That is the question that has focused the efforts of the Working Group the last two years, and whose consideration is summarized in this report. This report represents the first phase evaluation of this topic and is focused primarily on medium (MVDC) and low voltage (LVDC) level applications
Materials Chemistry and Physics, 2017
The present invention relates to a heat shrinkable protective element comprising at least one pro... more The present invention relates to a heat shrinkable protective element comprising at least one protective layer produced from a polymeric composition comprising a polymeric material, characterized in that the polymeric composition further comprises an electrically conductive filler having a BET specific surface of at least 100 m2 / g according to ASTM D 6556 standard.
The present invention relates to an electrical cable (1) comprising an elongate electrical conduc... more The present invention relates to an electrical cable (1) comprising an elongate electrical conductor (2), characterized in that the electric cable further comprises a layer (3) in electrical property gradient surrounding the elongate electrical conductor (2), said layer comprising an inner surface (3a), an outer surface (3b) and a region (3c) between said inner surface (3a) and said outer surface (3b), said zone (3c) having: - an electrical conductivity and / or a dielectric permittivity respectively lower than the electrical conductivity and / or dielectric permittivity of the inner surface (3a), and - an electrical conductivity and / or dielectric permittivity respectively lower than the electrical conductivity and / or dielectric permittivity of the outer surface (3b).
Fabrication of YBCO wires has been explored by using tubes formed from textured tapes. The textur... more Fabrication of YBCO wires has been explored by using tubes formed from textured tapes. The texture of tubes made from Ni-5 at % W is characterized as a bi-axial texture developing along both the axis and the circumference of the cylinder. The deposition of a buffer layer by metal-organic deposition on such a tube is described with the practical example of La2Zr2O7. A superconducting YBCO layer is deposited on top; its texture and the electrical performance are evaluated. In the present state of the art, the YBCO is superconducting at 88 K; it is textured, but can carry only week supercurrents due to insufficient percolation paths. Improvements of the process are underway to enhance the transport current properties.
Es wird ein supraleitfuhiges elektrisches Kabel angegeben, das einen aus supraleitfahigen Drahten... more Es wird ein supraleitfuhiges elektrisches Kabel angegeben, das einen aus supraleitfahigen Drahten bestehenden Leiter aufweist. Der Leiter (L) ist als Leiterseil aufgebaut, in dem die Drahte (1) mit vorgegebener, zwischen etwa 5 x D und etwa 20 x D liegender Schlaglange miteinander verseilt sind, mit dem Durchmesser D des Leiterseils.
2013 IEEE International Conference on Solid Dielectrics (ICSD), 2013
A Pulsed Electro-Acoustic (PEA) apparatus has been developed to measure the space charge distribu... more A Pulsed Electro-Acoustic (PEA) apparatus has been developed to measure the space charge distribution inside cable insulation. The technique relies on acoustic contact between the cylindrical cable surface and a flat aluminium plate to couple the acoustic waves to the sensor. This work addresses the practical issue of the clamping force required to maintain good contact and how this may alter the measured space charge distribution. Space charge measurements on mini-cables (model cables) were carried out over a wide range of clamping force and additionally a finite-element simulation model has been developed to model mechanical deformation of mini-cables and provide data that cannot be easily obtained from experiments. A clamping force range for reproducible measurements at room temperature has been determined by comparing results from a group test on a mini-cable.
Polymer
Commented information is provided on the origins and nature of nanodielectrics, on recent develop... more Commented information is provided on the origins and nature of nanodielectrics, on recent developments relative to polymer nanocomposites, on future needs for cable developments and findings about nano-PE and XLPE, and preliminary results concerning PE coated with nanosilica are reported in turns, to give a feeling of the progress in the field of nanodielectrics and a sense of what could be the potentiality for HV cable applications.
HAL (Le Centre pour la Communication Scientifique Directe), 2013
Conference on Electrical Insulation and Dielectric Phenomena, 2013
IEEE transactions on applied superconductivity, 2024
27th International Conference on Electricity Distribution (CIRED 2023)
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information), Dec 15, 2009
HAL (Le Centre pour la Communication Scientifique Directe), 2016
CIRED, Sep 20, 2021
"DC networks on Distribution Level – are they a new trend or a Vision?" That is the que... more "DC networks on Distribution Level – are they a new trend or a Vision?" That is the question that has focused the efforts of the Working Group the last two years, and whose consideration is summarized in this report. This report represents the first phase evaluation of this topic and is focused primarily on medium (MVDC) and low voltage (LVDC) level applications
Materials Chemistry and Physics, 2017
The present invention relates to a heat shrinkable protective element comprising at least one pro... more The present invention relates to a heat shrinkable protective element comprising at least one protective layer produced from a polymeric composition comprising a polymeric material, characterized in that the polymeric composition further comprises an electrically conductive filler having a BET specific surface of at least 100 m2 / g according to ASTM D 6556 standard.
The present invention relates to an electrical cable (1) comprising an elongate electrical conduc... more The present invention relates to an electrical cable (1) comprising an elongate electrical conductor (2), characterized in that the electric cable further comprises a layer (3) in electrical property gradient surrounding the elongate electrical conductor (2), said layer comprising an inner surface (3a), an outer surface (3b) and a region (3c) between said inner surface (3a) and said outer surface (3b), said zone (3c) having: - an electrical conductivity and / or a dielectric permittivity respectively lower than the electrical conductivity and / or dielectric permittivity of the inner surface (3a), and - an electrical conductivity and / or dielectric permittivity respectively lower than the electrical conductivity and / or dielectric permittivity of the outer surface (3b).
Fabrication of YBCO wires has been explored by using tubes formed from textured tapes. The textur... more Fabrication of YBCO wires has been explored by using tubes formed from textured tapes. The texture of tubes made from Ni-5 at % W is characterized as a bi-axial texture developing along both the axis and the circumference of the cylinder. The deposition of a buffer layer by metal-organic deposition on such a tube is described with the practical example of La2Zr2O7. A superconducting YBCO layer is deposited on top; its texture and the electrical performance are evaluated. In the present state of the art, the YBCO is superconducting at 88 K; it is textured, but can carry only week supercurrents due to insufficient percolation paths. Improvements of the process are underway to enhance the transport current properties.
Es wird ein supraleitfuhiges elektrisches Kabel angegeben, das einen aus supraleitfahigen Drahten... more Es wird ein supraleitfuhiges elektrisches Kabel angegeben, das einen aus supraleitfahigen Drahten bestehenden Leiter aufweist. Der Leiter (L) ist als Leiterseil aufgebaut, in dem die Drahte (1) mit vorgegebener, zwischen etwa 5 x D und etwa 20 x D liegender Schlaglange miteinander verseilt sind, mit dem Durchmesser D des Leiterseils.
2013 IEEE International Conference on Solid Dielectrics (ICSD), 2013
A Pulsed Electro-Acoustic (PEA) apparatus has been developed to measure the space charge distribu... more A Pulsed Electro-Acoustic (PEA) apparatus has been developed to measure the space charge distribution inside cable insulation. The technique relies on acoustic contact between the cylindrical cable surface and a flat aluminium plate to couple the acoustic waves to the sensor. This work addresses the practical issue of the clamping force required to maintain good contact and how this may alter the measured space charge distribution. Space charge measurements on mini-cables (model cables) were carried out over a wide range of clamping force and additionally a finite-element simulation model has been developed to model mechanical deformation of mini-cables and provide data that cannot be easily obtained from experiments. A clamping force range for reproducible measurements at room temperature has been determined by comparing results from a group test on a mini-cable.
Polymer
Commented information is provided on the origins and nature of nanodielectrics, on recent develop... more Commented information is provided on the origins and nature of nanodielectrics, on recent developments relative to polymer nanocomposites, on future needs for cable developments and findings about nano-PE and XLPE, and preliminary results concerning PE coated with nanosilica are reported in turns, to give a feeling of the progress in the field of nanodielectrics and a sense of what could be the potentiality for HV cable applications.
HAL (Le Centre pour la Communication Scientifique Directe), 2013
Conference on Electrical Insulation and Dielectric Phenomena, 2013