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

Document Type

Conference Proceeding

Publication Date


Publication Title

IEEE Xplore

Conference Name

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena


In this study, negative-polarity, standard lightning impulse voltages with different magnitudes were employed throughout the experiments. The percentage of SF 6 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+SF 6 has increased dramatically when mixed with a small percentage of SF 6 under impulse voltages. However, the breakdown voltages were found to be higher than positive polarity, non-uniform and uniform fields.


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