Surface discharge propagation: the influence of surface charge

E. Santos Mora, S.J. MacGregor, I. Timoshkin, M.J. Given, R.A. Fouracre

Research output: Contribution to conferencePaper

15 Citations (Scopus)

Abstract

Surface discharges are of considerable importance, because of their influence on the reliability of high voltage pulsed power systems. It is possible to achieve long discharges with relatively low voltages particularly in the presence of surface charge. The theory of streamer development in gases has been the subject of major experimental studies into the precise mechanisms of their initiation and development. However, surface discharge development is complicated by the proximity of the underlying insulating surface and the coupling of the discharge to that surface. This leads to modifications of the electric field surrounding the streamer, particularly at the head of the discharge. Photons generated at the discharge head can interact with the surface, producing photo-emission thus changing the surface charge distribution. Ablation of the surface results in local modifications of the gas atmosphere. The present experimental study has investigated the influence of surface charging on guided streamers propagating over insulating surfaces. The streamers were initiated from a surface mounted electrode excited by a high voltage pulse, the duration of which was much shorter than the time taken for the streamer to propagate across the surface. It was found that the velocity and distance of propagation is strongly influenced by the presence and magnitude of the surface charge and that discharge propagation can occur in the absence of the HV pulse. Measurements have shown that the deposited surface charge decays with time and that there are two distinct decay rates. These changes in the surface charge distribution could have a bearing on the period of time that should elapse before the subsequent reapplication of HV pulses to produce consistent discharge behaviour or to avoid surface flashover.

Conference

ConferenceTwenty-Seventh International Power Modulator Symposium, 2006
CountryUnited States
CityArlington, Virginia
Period14/05/0618/05/06

Fingerprint

propagation
charge distribution
high voltages
pulses
flashover
gases
low voltage
ablation
decay rates
charging
proximity
atmospheres
electrodes
electric fields
photons
decay

Keywords

  • propagation
  • surface charge

Cite this

Santos Mora, E., MacGregor, S. J., Timoshkin, I., Given, M. J., & Fouracre, R. A. (2006). Surface discharge propagation: the influence of surface charge. 39-42. Paper presented at Twenty-Seventh International Power Modulator Symposium, 2006, Arlington, Virginia, United States. https://doi.org/10.1109/MODSYM.2006.365178
Santos Mora, E. ; MacGregor, S.J. ; Timoshkin, I. ; Given, M.J. ; Fouracre, R.A. / Surface discharge propagation: the influence of surface charge. Paper presented at Twenty-Seventh International Power Modulator Symposium, 2006, Arlington, Virginia, United States.4 p.
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Santos Mora, E, MacGregor, SJ, Timoshkin, I, Given, MJ & Fouracre, RA 2006, 'Surface discharge propagation: the influence of surface charge' Paper presented at Twenty-Seventh International Power Modulator Symposium, 2006, Arlington, Virginia, United States, 14/05/06 - 18/05/06, pp. 39-42. https://doi.org/10.1109/MODSYM.2006.365178

Surface discharge propagation: the influence of surface charge. / Santos Mora, E.; MacGregor, S.J.; Timoshkin, I.; Given, M.J.; Fouracre, R.A.

2006. 39-42 Paper presented at Twenty-Seventh International Power Modulator Symposium, 2006, Arlington, Virginia, United States.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Surface discharge propagation: the influence of surface charge

AU - Santos Mora, E.

AU - MacGregor, S.J.

AU - Timoshkin, I.

AU - Given, M.J.

AU - Fouracre, R.A.

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N2 - Surface discharges are of considerable importance, because of their influence on the reliability of high voltage pulsed power systems. It is possible to achieve long discharges with relatively low voltages particularly in the presence of surface charge. The theory of streamer development in gases has been the subject of major experimental studies into the precise mechanisms of their initiation and development. However, surface discharge development is complicated by the proximity of the underlying insulating surface and the coupling of the discharge to that surface. This leads to modifications of the electric field surrounding the streamer, particularly at the head of the discharge. Photons generated at the discharge head can interact with the surface, producing photo-emission thus changing the surface charge distribution. Ablation of the surface results in local modifications of the gas atmosphere. The present experimental study has investigated the influence of surface charging on guided streamers propagating over insulating surfaces. The streamers were initiated from a surface mounted electrode excited by a high voltage pulse, the duration of which was much shorter than the time taken for the streamer to propagate across the surface. It was found that the velocity and distance of propagation is strongly influenced by the presence and magnitude of the surface charge and that discharge propagation can occur in the absence of the HV pulse. Measurements have shown that the deposited surface charge decays with time and that there are two distinct decay rates. These changes in the surface charge distribution could have a bearing on the period of time that should elapse before the subsequent reapplication of HV pulses to produce consistent discharge behaviour or to avoid surface flashover.

AB - Surface discharges are of considerable importance, because of their influence on the reliability of high voltage pulsed power systems. It is possible to achieve long discharges with relatively low voltages particularly in the presence of surface charge. The theory of streamer development in gases has been the subject of major experimental studies into the precise mechanisms of their initiation and development. However, surface discharge development is complicated by the proximity of the underlying insulating surface and the coupling of the discharge to that surface. This leads to modifications of the electric field surrounding the streamer, particularly at the head of the discharge. Photons generated at the discharge head can interact with the surface, producing photo-emission thus changing the surface charge distribution. Ablation of the surface results in local modifications of the gas atmosphere. The present experimental study has investigated the influence of surface charging on guided streamers propagating over insulating surfaces. The streamers were initiated from a surface mounted electrode excited by a high voltage pulse, the duration of which was much shorter than the time taken for the streamer to propagate across the surface. It was found that the velocity and distance of propagation is strongly influenced by the presence and magnitude of the surface charge and that discharge propagation can occur in the absence of the HV pulse. Measurements have shown that the deposited surface charge decays with time and that there are two distinct decay rates. These changes in the surface charge distribution could have a bearing on the period of time that should elapse before the subsequent reapplication of HV pulses to produce consistent discharge behaviour or to avoid surface flashover.

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Santos Mora E, MacGregor SJ, Timoshkin I, Given MJ, Fouracre RA. Surface discharge propagation: the influence of surface charge. 2006. Paper presented at Twenty-Seventh International Power Modulator Symposium, 2006, Arlington, Virginia, United States. https://doi.org/10.1109/MODSYM.2006.365178