Advanced

Spectroscopic measurements of streamer filaments in electric breakdown in a dielectric liquid

Barmann, P; Kröll, Stefan LU and Sunesson, A (1996) In Journal of Physics D: Applied Physics 29(5). p.1188-1196
Abstract
Emission spectroscopy has been utilized to provide information about the electron density and temperature in streamers and breakdown arcs in transformer oil. Recorded spectra include strongly broadened hydrogen Balmer-alpha lines and vibration/rotation band profiles of the C-2 molecule. The origin of the observed broadening of hydrogen lines is discussed and it is concluded that it arises mainly from collisions with charged particles, so-called dynamic Stark broadening. By assuming that the broadening is due solely to dynamic Stark broadening, electron densities between 1 x 10(18) and 1 x 10(19) cm(-3) were obtained for the rear of positive streamer filaments during the later stages of propagation. For negative streamers we obtained an... (More)
Emission spectroscopy has been utilized to provide information about the electron density and temperature in streamers and breakdown arcs in transformer oil. Recorded spectra include strongly broadened hydrogen Balmer-alpha lines and vibration/rotation band profiles of the C-2 molecule. The origin of the observed broadening of hydrogen lines is discussed and it is concluded that it arises mainly from collisions with charged particles, so-called dynamic Stark broadening. By assuming that the broadening is due solely to dynamic Stark broadening, electron densities between 1 x 10(18) and 1 x 10(19) cm(-3) were obtained for the rear of positive streamer filaments during the later stages of propagation. For negative streamers we obtained an upper limit of 3 x 10(16) cm(-3) and for breakdown arcs electron densities up to 4 x 10(18) cm(-3). The temperature information in the C-2 emission profiles and the intensity ratio of the hydrogen Balmer lines are discussed. Rough estimations of the temperature are presented both for positive and for negative streamers. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics D: Applied Physics
volume
29
issue
5
pages
1188 - 1196
publisher
IOP Publishing
external identifiers
  • scopus:0030148877
ISSN
1361-6463
DOI
10.1088/0022-3727/29/5/012
language
English
LU publication?
yes
id
0111e821-5c66-4aea-a2fa-468b0a49c86c (old id 2257421)
date added to LUP
2012-02-23 23:32:06
date last changed
2017-01-01 07:54:23
@article{0111e821-5c66-4aea-a2fa-468b0a49c86c,
  abstract     = {Emission spectroscopy has been utilized to provide information about the electron density and temperature in streamers and breakdown arcs in transformer oil. Recorded spectra include strongly broadened hydrogen Balmer-alpha lines and vibration/rotation band profiles of the C-2 molecule. The origin of the observed broadening of hydrogen lines is discussed and it is concluded that it arises mainly from collisions with charged particles, so-called dynamic Stark broadening. By assuming that the broadening is due solely to dynamic Stark broadening, electron densities between 1 x 10(18) and 1 x 10(19) cm(-3) were obtained for the rear of positive streamer filaments during the later stages of propagation. For negative streamers we obtained an upper limit of 3 x 10(16) cm(-3) and for breakdown arcs electron densities up to 4 x 10(18) cm(-3). The temperature information in the C-2 emission profiles and the intensity ratio of the hydrogen Balmer lines are discussed. Rough estimations of the temperature are presented both for positive and for negative streamers.},
  author       = {Barmann, P and Kröll, Stefan and Sunesson, A},
  issn         = {1361-6463},
  language     = {eng},
  number       = {5},
  pages        = {1188--1196},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics D: Applied Physics},
  title        = {Spectroscopic measurements of streamer filaments in electric breakdown in a dielectric liquid},
  url          = {http://dx.doi.org/10.1088/0022-3727/29/5/012},
  volume       = {29},
  year         = {1996},
}