Title :
Effect of electrode shape on particle-initiated breakdown in SF6 gas under DC voltage
Author :
Hara, M. ; Lee, H.H. ; Egashira, T.
Author_Institution :
Dept. of Electr. Eng., Kyushu Univ., Fukuoka, Japan
fDate :
2/1/1991 12:00:00 AM
Abstract :
Three methods are presented for improving the particle-initiated breakdown voltage of a spacer in sulfur hexafluoride (SF6) gas: the metal insert, recessed electrode, and shield ring methods. To find the basic method for improving the withstand voltage of the spacer, electrode shapes are changed and electric field calculations on these shapes are performed by using a cylindrical spacer. The distribution of charge accumulation on its surface was observed using the dust figure technique. The effect of electrode shape on the flashover voltage when a metallic particle is located on the spacer in SF6 gas under DC voltage was investigated. Experimental investigations show that the change of electrode shape leads to improvement of breakdown voltages by 30.9% in the metal insert method, 33.8% in the recessed electrode method, but very little in shield ring method
Keywords :
electric breakdown of gases; electric strength; gaseous insulation; sulphur compounds; DC voltage; SF6 gas; cylindrical spacer; distribution of charge accumulation; dust figure technique; electric field calculations; electrode shape; electrode shapes; metal insert method; particle-initiated breakdown voltage; recessed electrode method; shield ring method; spacer in SF6; withstand voltage; Breakdown voltage; Conductors; Dielectric breakdown; Dielectrics and electrical insulation; Electric breakdown; Electrodes; Flashover; Gas insulation; Shape; Sulfur hexafluoride;
Journal_Title :
Electrical Insulation, IEEE Transactions on
