Determination of the optimum size, material and position for dielectric barrier with presence of cone particle contamination in rod-plane gap

Dielectric barriers play a great role in improving the electric field homogeneity and improving dielectric behavior of rod-plane gaps. SF
₆
gas is an expensive gas and has strong greenhouse effect. So, it is a must to limit using it and develop gas melanges having good insulating characteristics, with less cost and no greenhouse effect. This work sheds light on determination the optimum diameter, thickness, position and material of the barrier in rod-plane gap. Influence of barrier presence on electric field intensity and breakdown voltage of rod-plane gap is studied. Influence of cone particle length and radius on electric field and breakdown voltage of gap are examined. Effect of barrier size (thickness and diameter), position and material on the breakdown voltage is calculated. The SF
₆
-N
₂
-Air gas melanges are tested at different percentages in order to study effects of gas pressure, SF
₆
gas concentration in the mixture and attain the optimal gas mixture with better favorable dielectric strength. Finally, a comparison between breakdown voltages of clean gap, clean gap with barrier, gap with wire particle and gap with cone particle is presented to confirm importance of the barrier in the gap and determining the most fatal case.