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The effect of photostabilizers on polymeric insulation used at high voltages
Author(s) -
Bamji Soli,
Bulinski Aleksander,
Densley John
Publication year - 1989
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19890250125
Subject(s) - electrical treeing , materials science , low density polyethylene , ultraviolet , polymer , photodegradation , electroluminescence , polyethylene , degradation (telecommunications) , composite material , oxygen , voltage , excited state , radiation , inert gas , optoelectronics , chemistry , partial discharge , photocatalysis , electrical engineering , optics , organic chemistry , catalysis , layer (electronics) , engineering , physics , nuclear physics
Abstract Polymeric insulation used in high voltage applications and subjected to divergent electric fields emits ultraviolet radiation due to electroluminescence. The chromophores present in the polymer initiate photo‐degradation of the material and, in dry environment, this leads to electrical treeing which causes premature failure of the insulation. The role of photostabilizers which can limit the photodegradation caused by ultraviolet radiation is studied for LDPE containing the usual and decreased concentration of air. Degassing or impregnating the polymer with an inert gas decreases the concentration of oxygen and prolongs the time to tree inception because the probability of forming excited or anionic oxygen is reduced.