Title :
Electrical tree in ethylene based copolymers
Author :
Shimizu, N. ; Asai, H. ; Ishihara, H. ; Uchida, K. ; Rasikawan, S.
Author_Institution :
Dept. of Electr. Eng., Nagoya Univ., Japan
Abstract :
The electrical treeing resistance of ethylene-based copolymers is investigated. It is shown that the AC tree initiation voltages of copolymers with small contents (<5~7 wt.%) of polar monomers are higher than that of LDPE (low-density polyethylene). Removal of free oxygen gas by vacuum degassing treatment makes tree initiation voltage 6-7 times higher in LDPE and styrene-graft polyethylene. In EVA (ethylene-vinylacetate) and EAA (ethylene-acryclic acid) the effect of the degassing is not so large. Oxygen in polymer molecular structures may be released by carrier collision during voltage application
Keywords :
electric breakdown of solids; organic insulating materials; polymer blends; AC tree initiation voltages; EAA; EVA; LDPE; carrier collision; electrical treeing resistance; ethylene based copolymers; ethylene-acryclic acid; ethylene-vinylacetate; free oxygen gas; polar monomers; polymer molecular structures; styrene-graft polyethylene; vacuum degassing treatment; Cable insulation; Conducting materials; Dielectrics and electrical insulation; Electric resistance; Manufacturing; Polyethylene; Power cables; Temperature; Trees - insulation; Voltage;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1992. Annual Report. Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-0565-5
DOI :
10.1109/CEIDP.1992.283190
