Non-Uniform Field Breakdown of Ar+SF6 under Negative Polarity Impulse Voltages

Hiziroglu H. R., Dincer M. S.

IEEE Conference on Electrical Insulation and Dielectric Phenomena, Quebec City, Canada, 26 - 29 October 2008, pp.61-62 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1109/ceidp.2008.4772763
  • City: Quebec City
  • Country: Canada
  • Page Numbers: pp.61-62
  • Gazi University Affiliated: Yes


In this study, negative-polarity, standard lightning impulse voltages with different magnitudes were employed throughout the experiments. The percentage of SF6 in Ar was varied from 1% to 90% and from 1% to 75% at a total gas pressure of 50 kPa and 100 kPa, respectively. The breakdown voltage of each gas mixture was recorded at 50% breakdown probability. Similar to earlier studies under static electric fields it is observed that the breakdown voltages of Ar+SF6 has increased dramatically when mixed with a small percentage of SF6 under impulse voltages. However, the breakdown voltages were found to be higher than positive polarity, non-uniform and uniform fields.