Title :
The effect of a metallic particle near a spacer on flashover phenomena in SF6
Author :
Mazurek, B. ; Cross, J.D. ; van Heeswijk, R.G.
Author_Institution :
Tech. Univ. of Wroclaw, Poland
fDate :
4/1/1993 12:00:00 AM
Abstract :
A study of the flashover mechanism initiated by metallic particles in SF6 gas is presented. Using a high-speed Imacon photographic camera, it was established that a metallic particle near the insulator surface plays an important role in flashover development. The influence of the particle on flashover development depends on the pressure of the SF6 gas. At atmospheric pressure, the flashover was always initiated at a point on the particle farthest from the nearest electrode. At high pressures, it was found that breakdown develops from the electrode of relative positive polarity in the form of a leader. The velocity of the discharge crossing the gap increases exponentially when the distance between the particle and the insulator surface decreases
Keywords :
electric breakdown of solids; flashover; gaseous insulation; insulation testing; streak photography; sulphur compounds; SF6 gas; breakdown; discharge velocity; electrode polarity; flashover phenomena; high-speed Imacon photographic camera; insulator surface; metallic particle; pressure dependence; spacer; Breakdown voltage; Conductors; Electric breakdown; Electrodes; Flashover; Gas insulation; Metal-insulator structures; Solids; Sulfur hexafluoride; Surface discharges;
Journal_Title :
Electrical Insulation, IEEE Transactions on
