Hogg, Michael and Timoshkin, Igor and Given, M and Wilson, Mark and MacGregor, Scott and Wang, Tao and Fouracre, Richard and Lehr, J.M. (2012) Impulse breakdown of water with different conductivities. IEEE Transactions on Dielectrics and Electrical Insulation, 19 (5). pp. 1559-1568. ISSN 1070-9878Full text not available in this repository. Request a copy from the Strathclyde author
The complexity of the impulse breakdown of liquid water is reflected by the dependency of pre-breakdown processes on the polarity, rise-time and wave-shape of the applied impulses as well as on physical properties, such as the electrical conductivity of water itself. Further understanding of the mechanisms of formation and propagation of impulse discharges in water and water solutions is therefore required to enable the development of pulsed power and plasma technologies. This paper presents a study of the dielectric behaviour of water stressed with positive and negative high voltage impulses in a point-plane electrode topology. Water with different conductivities including distilled water and tap water was investigated. The volt-time breakdown characteristic of water is discussed and the total pre-breakdown time has been obtained for both positive and negative polarity impulses for 2 mm, 5 mm and 10 mm inter-electrode distances. The Laue statistical analysis has been used in order to calculate the statistical and formative time lags. Using the formative time data the nominal breakdown velocity in water for positive and negative impulses has been obtained. It has been shown that the anode discharges propagate with supersonic velocities, up to ~ 20.10^5 cm/s, and the cathode discharges are sub-sonic with a maximal velocity of ~ 10^5 cm/s. Discharge velocities are slightly higher in distilled water as compared with tap water. Potential breakdown mechanisms which can explain the observed polarity effects in the transient pre-breakdown processes in liquid water stressed with high voltage impulses are discussed.
|Keywords:||impulse breakdown, water, pulse power systems, electrical breakdown, impact , plasma, strength, fields, liquids, spark discharges, pulsed breakdown, high-power ultrasound, Electrical engineering. Electronics Nuclear engineering, Electrical and Electronic Engineering|
|Subjects:||Technology > Electrical engineering. Electronics Nuclear engineering|
|Department:||Faculty of Engineering > Electronic and Electrical Engineering|
|Depositing user:||Pure Administrator|
|Date Deposited:||03 Jan 2013 14:45|
|Last modified:||22 Mar 2017 11:55|