The Development of Fast Single-Shot and Repetitively-Operated SF6 Closing Switches for Pulsed-Power Applications
When sulphur hexafluoride (SF6) was first considered as a replacement for compressed air in gas-blast switchgear, it was attractive both for its high intrinsic strength and for its excellent dielectric recovery characteristics. These factors, coupled with the very rapid rates of voltage collapse, and hence the high values of dl/dt which are achievable at breakdown, also make SF6 the dielectric of choice in high-power plasma closing switches. For single-shot applications, SF6 spark-gap switches can be designed for voltages of 10kV-5MV, high current-handling capability and switching speeds up to 1015V/s.
KeywordsPulse Electric Field Sulphur Hexafluoride Thermal Recovery Voltage Collapse Voltage Recovery
Unable to display preview. Download preview PDF.
- 2.O Farish, O E Ibrahim and A Kurknoto, Prebreakdown corona processes in SF6 and SF6/N2 mixtures Proc 3rd International Symposium on High Voltage Technologies, paper 31.15,1979.Google Scholar
- 3.I D Chalmers, O Farish and S J MacGregor, 201CThe effect of impulse waveshape on point/plane breakdown in SF6 Gaseous Dielectrics IV, Pergamon Press, New York, p344–351,1984.Google Scholar
- 4.S J MacGregor S M Turnbull, F A Tuema and A D R Phelps,Methods of improving the pulse repetition frequency of high pressure gas switches 10th Int Pulsed Power Conf, Albuquerque, p249–254,1995.Google Scholar
- 7.S J MacGregor, S M Turnbull and F A Tuema,A lOOkV, 1kHz triggered pulse generator Proc 22nd IEEE Power Modulator Symposium, Boca Raton, Florida, p153–156, 1996.Google Scholar
- 9.J A Harrower,The development and characterisation of corona-stabilised repetitive closing switches, PhD Thesis, University of Strathclyde, 2001.Google Scholar
- 11.S J MacGregor, D Bickers, I C Somerville and O Farish, “Temporal development of nanosecond electrical discharges in highly divergent gaps” 6th IEEE Int Pulsed Power Conf, Washington DC, USA, pl87–190, 1987.Google Scholar
- 13.S J MacGregor, O Farish, R Fouracre, N J Rowan and J G Anderson, Inactivation of Pathogenic and Spoilage Microorganisms in Liquids Using Pulsed Electric Fields,IEEE Trans Plasma Science, Vol 28, Nol,pl44–149,2000.Google Scholar
- 15.S Espie, L Marsili, S J MacGregor and J G Anderson,Pulsed Power Inactivation of Liquid-Borne Microorganisms, Int Conf on Pulsed Power Applications, Gelsenkirchin, Germany, paper B07/1, 2001Google Scholar