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Streamer current in a three-electrode system

Akyuz, M; Gao, L; Cooray, V and Larsson, A (2001) In IEEE Transactions on Dielectrics and Electrical Insulation 8(4). p.665-672
Abstract
A study has been conducted on positive streamer discharges in air at atmospheric conditions for a three-electrode system. The electrode system consisted of two parallel planes (one grounded and one supplied with a negative dc voltage) and a small, insulated needle, sticking out from the center of the grounded plane. A triggering positive square impulse voltage of 5 mus duration was applied to the insulated needle and the currents associated with the streamer discharge were measured simultaneously on all three electrodes. During the streamer propagation, the current measured at the needle was the conduction current while the other two where the displacement (or capacitive) currents generated by the movement of charge in the electrode gap.... (More)
A study has been conducted on positive streamer discharges in air at atmospheric conditions for a three-electrode system. The electrode system consisted of two parallel planes (one grounded and one supplied with a negative dc voltage) and a small, insulated needle, sticking out from the center of the grounded plane. A triggering positive square impulse voltage of 5 mus duration was applied to the insulated needle and the currents associated with the streamer discharge were measured simultaneously on all three electrodes. During the streamer propagation, the current measured at the needle was the conduction current while the other two where the displacement (or capacitive) currents generated by the movement of charge in the electrode gap. The objective of this study is to identify the three currents and to investigate if simple representations of the streamer can reproduce the displacement currents measured at the plane electrodes. Two models for the streamer were applied: (1) a charged sphere moving in the background field and (2) a channel with a constant voltage gradient extending in the gap. In both models it was assumed that the streamer propagated with a constant velocity, which was estimated from the measurements. The motion of the streamer was simulated by a series of electrostatic calculations, using a field calculation program. Comparison of the measurements with the simulations indicates that the charge of the streamer is confined to a spherical region (i.e. streamer head) and it is increasing continuously during its advancement in the electrode gap, A discussion on advantages and disadvantages with the two investigated models (sphere vs. channel with potential gradient) is conducted, and a possible hybrid model is suggested. In the proposed model, features from both considered streamer representations are included. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
IEEE Transactions on Dielectrics and Electrical Insulation
volume
8
issue
4
pages
665 - 672
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:0035415152
ISSN
1070-9878
DOI
10.1109/94.946721
language
English
LU publication?
no
id
601a77d4-a76a-4e57-bcc7-b43fe4293ab2 (old id 2257036)
date added to LUP
2012-02-24 15:22:38
date last changed
2017-04-09 04:34:08
@article{601a77d4-a76a-4e57-bcc7-b43fe4293ab2,
  abstract     = {A study has been conducted on positive streamer discharges in air at atmospheric conditions for a three-electrode system. The electrode system consisted of two parallel planes (one grounded and one supplied with a negative dc voltage) and a small, insulated needle, sticking out from the center of the grounded plane. A triggering positive square impulse voltage of 5 mus duration was applied to the insulated needle and the currents associated with the streamer discharge were measured simultaneously on all three electrodes. During the streamer propagation, the current measured at the needle was the conduction current while the other two where the displacement (or capacitive) currents generated by the movement of charge in the electrode gap. The objective of this study is to identify the three currents and to investigate if simple representations of the streamer can reproduce the displacement currents measured at the plane electrodes. Two models for the streamer were applied: (1) a charged sphere moving in the background field and (2) a channel with a constant voltage gradient extending in the gap. In both models it was assumed that the streamer propagated with a constant velocity, which was estimated from the measurements. The motion of the streamer was simulated by a series of electrostatic calculations, using a field calculation program. Comparison of the measurements with the simulations indicates that the charge of the streamer is confined to a spherical region (i.e. streamer head) and it is increasing continuously during its advancement in the electrode gap, A discussion on advantages and disadvantages with the two investigated models (sphere vs. channel with potential gradient) is conducted, and a possible hybrid model is suggested. In the proposed model, features from both considered streamer representations are included.},
  author       = {Akyuz, M and Gao, L and Cooray, V and Larsson, A},
  issn         = {1070-9878},
  language     = {eng},
  number       = {4},
  pages        = {665--672},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Dielectrics and Electrical Insulation},
  title        = {Streamer current in a three-electrode system},
  url          = {http://dx.doi.org/10.1109/94.946721},
  volume       = {8},
  year         = {2001},
}