Zobrazeno 1 - 10 of 37 pro vyhledávání: '"Norbert Wenzel"'
1
A Simple Model of Distribution of Current Over Cathodes of Vacuum Circuit Breakers
Autor: Mario D. Cunha, Mikhail S. Benilov, Werner Hartmann, Norbert Wenzel, P. G. C. Almeida
Publikováno v: IEEE Transactions on Plasma Science. 47:3462-3469
There are several hundreds of spots operating simultaneously on cathodes of vacuum arcs in high-power vacuum circuit breakers. In this work, the spot distribution along the contact surface is simulated by means of an approach that is based on the con
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::72f4bc6ac7418618eb8199cfc6402da4
https://doi.org/10.1109/tps.2019.2927794
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2
Detailed Numerical Simulation of Cathode Spots in Vacuum Arcs—I
Autor: Werner Hartmann, Mario D. Cunha, Norbert Wenzel, Helena T. C. Kaufmann, Mikhail S. Benilov
Publikováno v: IEEE Transactions on Plasma Science. 45:2060-2069
A model of cathode spots in high-current vacuum arcs is developed, with account of the plasma cloud left over from a previously existing spot, all mechanisms of current transfer to the cathode surface, including the contribution of the plasma produce
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e635cc2629e134ab4909d34e285597af
https://doi.org/10.1109/tps.2017.2697005
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3
X-Radiation Emission of High-Voltage Vacuum Interrupters: Dose Rate Control under Testing and Operating Conditions
Autor: Stephan Wethekam, Stefan Giere, Thomas Heinz, Christian Stiehler, Andreas Lawall, Norbert Wenzel, Erik D. Taylor
Publikováno v: 2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV).
The present study investigates the possible emission of X-radiation from vacuum interrupters when applying high voltages between the separated contacts. Vacuum interrupters have to comply with the dose rate limits for X-radiation emission regulated b
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::27b5397a3cf74aa0b3365b52109e20be
https://doi.org/10.1109/deiv.2018.8537169
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4
Control of Vacuum Arcs in High-Voltage Vacuum Interrupters by Suitable Stroke Trajectories of Opening AMF Contacts
Autor: Thomas Heinz, Martin Koletzko, Stefan Giere, Norbert Wenzel, Stephan Wethekam
Publikováno v: 2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV).
Vacuum circuit breakers switch off high short-circuit currents during faults on electrical distribution and transmission systems. Vacuum interrupter (VI) contacts suitable for large contact gaps, as demanded for high-voltages (HV), often use axial ma
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4f72a79a9836ce8ce86cfcbcaca4c3c9
https://doi.org/10.1109/deiv.2018.8537108
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5
Simulating Propagation of Spots over Cathodes of High-Power Vacuum Circuit Breakers
Autor: Mikhail S. Benilov, Norbert Wenzel, P. G. C. Almeida, Werner Hartmann, Mario D. Cunha
Publikováno v: 2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV).
Cathode attachment of high-current vacuum arcs, e.g., those in high-power vacuum circuit breakers, represents an ensemble of several hundred of spots operating simultaneously. A natural alternative to tracing individual spots is to employ the concept
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a81577e9ae0c10f23cc83072842a207e
https://doi.org/10.1109/deiv.2018.8537028
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6
Advanced Modeling of Plasma-Cathode Interaction in Vacuum and Low-Pressure Arcs
Autor: Helena T. C. Kaufmann, Werner Hartmann, Mikhail S. Benilov, Norbert Wenzel, Mario D. Cunha
Publikováno v: 2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV).
A detailed model has been developed for modeling of arc plasma-cathode interaction, which takes into account a pre-existing plasma cloud, the interaction of the metal vapor plasma produced in the spot with the cathode, Joule heat generation in the ca
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c77fa918565611cc23b542234bd5a5be
https://doi.org/10.1109/deiv.2018.8537038
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7
Metal Vapor Deposition in Vacuum Interrupters: Utilization of DSMC Methods and Considerations on Vapor Sources
Autor: Norbert Wenzel, Andreas Geisler
Publikováno v: 2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV).
The emission of contact material into the vacuum inflicted by switching operations of vacuum interrupters (VIs) is crucial for both, the metal coating of inner surfaces and the space and time depending vapor pressure in the tube chamber, having impac
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::179ad0667ed54ddca4730ee96e7b0ca4
https://doi.org/10.1109/deiv.2018.8537030
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8
Simulating Ignition and Development of Cathode Spots in Vacuum Arcs
Autor: Mario D. Cunha, Werner Hartmann, Norbert Wenzel, Mikhail S. Benilov, Helena T. C. Kaufmann
Publikováno v: 2017 IEEE International Conference on Plasma Science (ICOPS).
A detailed numerical model of individual cathode spots in high-current vacuum arcs is developed. The model takes into account two kinds of plasmas in the vicinity of the spot: an “external” plasma (e.g., a plasma generated for arc triggering, a b
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::69cbdbe038a8661686badb1409830cf8
https://doi.org/10.1109/plasma.2017.8496070
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9
Prediction of lightning impulse voltage induced breakdown in vacuum interrupters
Autor: Nicolò Marconato, Ruben Specogna, A. De Lorenzi, Andreas Lawall, Nicola Pilan, Norbert Wenzel, Paolo Bettini
Publikováno v: IEEE transactions on dielectrics and electrical insulation 24 (2017): 3367–3373. doi:10.1109/TDEI.2017.006485
info:cnr-pdr/source/autori:Marconato N.; De Lorenzi A.; Pilan N.; Bettini P.; Specogna R.; Lawall A.; Wenzel N./titolo:Prediction of lightning impulse voltage induced breakdown in vacuum interrupters/doi:10.1109%2FTDEI.2017.006485/rivista:IEEE transactions on dielectrics and electrical insulation/anno:2017/pagina_da:3367/pagina_a:3373/intervallo_pagine:3367–3373/volume:24
A concept to predict the Lightning Impulse Voltage (LIV) breakdown probability of medium voltage Vacuum Interrupter (VI) tubes has been developed and tested for the first time employing the Voltage Holding Prediction Model (VHPM) originally formulate
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4588882c2a8c8effd6eb5b7dd275b419
https://publications.cnr.it/doc/387942
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10
Near-Cathode Plasma Layer on CuCr Contacts of Vacuum Arcs
Autor: N. A. Almeida, Norbert Wenzel, Larissa G. Benilova, Mikhail S. Benilov, Werner Hartmann
Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
A model of near-cathode layers in vacuum arcs is developed. The model relies on a numerical solution of the problem of near-cathode space-charge sheath with ionization of atoms emitted by the cathode surface, and allows the self-consistent determinat
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02345ae72dc249ca074d053a751c7155
https://doi.org/10.1109/tps.2013.2260832
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