Title :
Electrical tree initiation due to bombardment of metastable excited Ar
Author_Institution :
Dept. of Electr. Eng., Nagoya Univ., Japan
Abstract :
Ac tree initiation voltage of Ar-impregnated LDPE is much lower than vacuum-degassed LDPE, and even lower than normal (air-impregnated) LDPE. Injected electrons are accelerated in polymer free volume. In Ar-impregnated LDPE, the hot electrons collide with Ar atoms in free volume and excite them to metastable level. Metastable atom can return to ground state after transferring the energy by collision with free volume wall. The energy transferred from metastable atom breaks polymer bond of free volume wall, and creates micro cavity in short time
Keywords :
argon; atom-surface impact; composite insulating materials; hot carriers; metastable states; polyethylene insulation; trees (electrical); AC electrical tree initiation; Ar; Ar-impregnated LDPE; air-impregnated LDPE; bond breaking; energy transfer; hot electron collisions; metastable excited Ar atom bombardment; microcavity; polymer free volume; vacuum-degassed LDPE; Acceleration; Argon; Bonding; Electrodes; Electrons; Metastasis; Needles; Polymers; Thermal degradation; Voltage;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1997. IEEE 1997 Annual Report., Conference on
Conference_Location :
Minneapolis, MN
Print_ISBN :
0-7803-3851-0
DOI :
10.1109/CEIDP.1997.634620
