Title :
Tree propagation and the effects of barriers
Author :
Auckland, D.W. ; Kabir, S.M.F. ; Varlow, B.R.
Author_Institution :
Manchester Univ., UK
Abstract :
The authors describe impulse experiments using alternating voltages and the explosion effect simulated to create synthetic tree channels. It is confirmed that trees propagate by fast fracture triggered by the explosive effect of localized intrinsic breakdown at points of electrical stress concentration. The interaction between barriers and advancing tree channels is determined by the barrier´s adhesive bond to the surrounding matrix, its fracture toughness, and its melting point. Results are presented for various types of barrier cast in clear polyester resin
Keywords :
electric breakdown of solids; fracture toughness; insulation testing; organic insulating materials; polymers; adhesive bond strength; alternating voltages; barrier effect; electrical stress; explosion effect; fast fracture; fracture toughness; impulse voltages; light pulse emission; localized breakdown; localized intrinsic breakdown; mechanical damage; melting point; optical activity; polyester resin; synthetic tree channels; tree propagation; Dielectrics; Electrodes; Explosions; Optical microscopy; Resins; Stimulated emission; Stress; Testing; Trees - insulation; Voltage;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1989., Proceedings of the 3rd International Conference on
Conference_Location :
Trondheim
DOI :
10.1109/ICSD.1989.69255
