Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Lars E. Lundgaard"'
Autor:
Inge Madshaven, Henrik Enoksen, Lars E. Lundgaard, Stefan Jaufer, Christoph Krause, Borut Prašnikar, Asgeir Mjelve
Publikováno v:
Energies, Vol 17, Iss 12, p 2898 (2024)
The electrification of society, increasing renewable energy sources and mobility charging lead to new loading patterns for power transformers. Dynamic load conditions induce enhanced mechanical stress on the transformers’ windings, potentially caus
Externí odkaz:
https://doaj.org/article/78694fb2b7ee4a1189cb67e74f5d03f3
Publikováno v:
IEEE transactions on dielectrics and electrical insulation
The effect of pressure on positive and negative streamer propagation in a mineral transformer oil is studied in an 80 mm point-plane gap under step voltage. Increased pressure causes reduced stopping length for non-breakdown streamers, higher breakdo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69c7ee402dd56df8915a6800325f3ab9
https://doi.org/10.1109/tdei.2020.008940
https://doi.org/10.1109/tdei.2020.008940
Autor:
Lars E. Lundgaard, Dag Linhell
Publikováno v:
2021 IEEE Electrical Insulation Conference (EIC).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::544ec092a956361693f860d87fbddfdd
https://doi.org/10.1109/eic49891.2021.9612373
https://doi.org/10.1109/eic49891.2021.9612373
Publikováno v:
2021 IEEE Electrical Insulation Conference (EIC).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b363236127d5df5b394eb01f20b529e
https://doi.org/10.1109/eic49891.2021.9612288
https://doi.org/10.1109/eic49891.2021.9612288
The propagation of positive streamers in a naphtenic transformer oil in an 80 mm point-plane gap has been investigated under an impulse voltage being close to a step voltage and under pressures ranging from 0.1 to 1.7 MPa. As has previously been foun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d0343bcd826ddfedadd95fc25cf7c86
http://hdl.handle.net/11250/2611958
http://hdl.handle.net/11250/2611958
Publikováno v:
Journal of Physics Communications
This study addresses the dielectric performance of nonpolar hydrocarbon liquids and mineral oils under negative polarity stress. Stopping length for non-breakdown streamers, breakdown voltages and velocities for various pre-breakdown streamer modes h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f87c077e449aa8afd6f913964a4c8e2c
https://doi.org/10.1088/2399-6528/ab7b32
https://doi.org/10.1088/2399-6528/ab7b32
Publikováno v:
Proceedings of the Nordic Insulation Symposium.
Positive breakdown streamers have been investigated in a short (5 mm) point-plane gap in cyclohexane and n-tridecane with and without the additives N,N-dimethylamine (DMA) with low ionization potential and azobenzene with a not quite as low ionizatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7fb94dde8a061cd82cefbe63211261f1
https://doi.org/10.5324/nordis.v0i23.2488
https://doi.org/10.5324/nordis.v0i23.2488
Autor:
Pascal Mavrommatis, Nenad Stjepanovic, Lars E. Lundgaard, Cédric Lesaint, D. Linhjell, Knut Brede Liland, Marit-Helen Glomm Ese
Publikováno v:
2017 IEEE 19th International Conference on Dielectric Liquids (ICDL).
For transformers in service, aging markers from cellulose in oil such as furans, water, methanol and acids are measured for diagnostic purposes. The content of these indicators, measured in oil, may therefore vary with load, temperature, solid and li
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::26269a7f12616a81eb3d0eee45b3f4ab
https://doi.org/10.1109/icdl.2017.8124699
https://doi.org/10.1109/icdl.2017.8124699
Publikováno v:
2017 IEEE 19th International Conference on Dielectric Liquids (ICDL).
Third mode streamers have been studied in the mineral oil Nytro 10 XN, gas-to-liquid oil Diala S4 ZX-1 and the high viscosity white oil Primol 352, in an 80 mm point-plane gap under step impulse voltage. Third mode streamer velocities were in the ran
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7ac2a086b520f8911dc6e9dd22ddc0e
https://doi.org/10.1109/icdl.2017.8124601
https://doi.org/10.1109/icdl.2017.8124601
A sensitive differential charge measurement technique was used to measure the conduction current from a sharp needle in a needle plane geometry in n-pentane. The current was measured at voltages up to the threshold for streamer inception in n-pentane
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c4022fbe2c2c983a0f82f46cb6ae738
https://hdl.handle.net/11250/2493556
https://hdl.handle.net/11250/2493556