The suitability of N2 to replace SF6 in a triggered spark-gap switch for pulsed power applications

G.R. Stewart, M.P. Wilson, I. Timoshkin, M.J. Given, S.J. MacGregor, M.A. Sinclair, K.J. Thomas

Research output: Contribution to conferencePaper

2 Citations (Scopus)
275 Downloads (Pure)

Abstract

The high dielectric strength of sulphur hexafluoride (SF6) when compared with other gases, coupled with safety benefits such as non-flammability and non-toxicity, has seen the widespread use of SF6 for the insulation of switching components. However, SF6 is now widely recognised as a highly damaging greenhouse gas, and investigations of the switching properties of alternative gases to replace SF6 within the bounds of existing system topologies are required. In the present paper, a comparative study has been carried out on a triggered spark-gap of type presently deployed in industrial pulsed-power machines, to determine the suitability of nitrogen (N2) to replace SF6 as the switching medium, without compromising on functionality. Experiments were performed with fast-rising trigger pulses to minimise the delay time to breakdown and jitter, and three distinct operational regimes have been identified for both gases as the pressure inside the switch is increased. The static breakdown characteristics and upper pressure boundaries of operation have been determined for both gases at a range of dc charging voltages. Measurements of the time to breakdown have shown jitters as low as 1.3 ns when operating in N2, highlighting the potential of N2 to replace SF6 without the need for re-design or replacement of the presently used switch.
Original languageEnglish
Publication statusPublished - Sep 2009
EventThe 44th International Universities' Power Engineering Conference - Glasgow, United Kingdom
Duration: 1 Sep 20094 Sep 2009

Conference

ConferenceThe 44th International Universities' Power Engineering Conference
CountryUnited Kingdom
CityGlasgow
Period1/09/094/09/09

Fingerprint

Electric sparks
Switches
Jitter
Gases
Sulfur hexafluoride
Greenhouse gases
Insulation
Time delay
Topology
Nitrogen
Electric potential
Experiments

Keywords

  • breakdown voltage
  • jitter
  • global warming
  • dielectric breakdown
  • safety
  • switches
  • gas insulation
  • gases
  • electric breakdown
  • dielectrics and electrical insulation

Cite this

Stewart, G. R., Wilson, M. P., Timoshkin, I., Given, M. J., MacGregor, S. J., Sinclair, M. A., & Thomas, K. J. (2009). The suitability of N2 to replace SF6 in a triggered spark-gap switch for pulsed power applications. Paper presented at The 44th International Universities' Power Engineering Conference, Glasgow, United Kingdom.
Stewart, G.R. ; Wilson, M.P. ; Timoshkin, I. ; Given, M.J. ; MacGregor, S.J. ; Sinclair, M.A. ; Thomas, K.J. / The suitability of N2 to replace SF6 in a triggered spark-gap switch for pulsed power applications. Paper presented at The 44th International Universities' Power Engineering Conference, Glasgow, United Kingdom.
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Stewart, GR, Wilson, MP, Timoshkin, I, Given, MJ, MacGregor, SJ, Sinclair, MA & Thomas, KJ 2009, 'The suitability of N2 to replace SF6 in a triggered spark-gap switch for pulsed power applications' Paper presented at The 44th International Universities' Power Engineering Conference, Glasgow, United Kingdom, 1/09/09 - 4/09/09, .

The suitability of N2 to replace SF6 in a triggered spark-gap switch for pulsed power applications. / Stewart, G.R.; Wilson, M.P.; Timoshkin, I.; Given, M.J.; MacGregor, S.J.; Sinclair, M.A.; Thomas, K.J.

2009. Paper presented at The 44th International Universities' Power Engineering Conference, Glasgow, United Kingdom.

Research output: Contribution to conferencePaper

TY - CONF

T1 - The suitability of N2 to replace SF6 in a triggered spark-gap switch for pulsed power applications

AU - Stewart, G.R.

AU - Wilson, M.P.

AU - Timoshkin, I.

AU - Given, M.J.

AU - MacGregor, S.J.

AU - Sinclair, M.A.

AU - Thomas, K.J.

PY - 2009/9

Y1 - 2009/9

N2 - The high dielectric strength of sulphur hexafluoride (SF6) when compared with other gases, coupled with safety benefits such as non-flammability and non-toxicity, has seen the widespread use of SF6 for the insulation of switching components. However, SF6 is now widely recognised as a highly damaging greenhouse gas, and investigations of the switching properties of alternative gases to replace SF6 within the bounds of existing system topologies are required. In the present paper, a comparative study has been carried out on a triggered spark-gap of type presently deployed in industrial pulsed-power machines, to determine the suitability of nitrogen (N2) to replace SF6 as the switching medium, without compromising on functionality. Experiments were performed with fast-rising trigger pulses to minimise the delay time to breakdown and jitter, and three distinct operational regimes have been identified for both gases as the pressure inside the switch is increased. The static breakdown characteristics and upper pressure boundaries of operation have been determined for both gases at a range of dc charging voltages. Measurements of the time to breakdown have shown jitters as low as 1.3 ns when operating in N2, highlighting the potential of N2 to replace SF6 without the need for re-design or replacement of the presently used switch.

AB - The high dielectric strength of sulphur hexafluoride (SF6) when compared with other gases, coupled with safety benefits such as non-flammability and non-toxicity, has seen the widespread use of SF6 for the insulation of switching components. However, SF6 is now widely recognised as a highly damaging greenhouse gas, and investigations of the switching properties of alternative gases to replace SF6 within the bounds of existing system topologies are required. In the present paper, a comparative study has been carried out on a triggered spark-gap of type presently deployed in industrial pulsed-power machines, to determine the suitability of nitrogen (N2) to replace SF6 as the switching medium, without compromising on functionality. Experiments were performed with fast-rising trigger pulses to minimise the delay time to breakdown and jitter, and three distinct operational regimes have been identified for both gases as the pressure inside the switch is increased. The static breakdown characteristics and upper pressure boundaries of operation have been determined for both gases at a range of dc charging voltages. Measurements of the time to breakdown have shown jitters as low as 1.3 ns when operating in N2, highlighting the potential of N2 to replace SF6 without the need for re-design or replacement of the presently used switch.

KW - breakdown voltage

KW - jitter

KW - global warming

KW - dielectric breakdown

KW - safety

KW - switches

KW - gas insulation

KW - gases

KW - electric breakdown

KW - dielectrics and electrical insulation

UR - http://www.upec2009.org/content/

UR - http://www.upec2009.org/content/node/180

M3 - Paper

ER -

Stewart GR, Wilson MP, Timoshkin I, Given MJ, MacGregor SJ, Sinclair MA et al. The suitability of N2 to replace SF6 in a triggered spark-gap switch for pulsed power applications. 2009. Paper presented at The 44th International Universities' Power Engineering Conference, Glasgow, United Kingdom.