Article,
LONG-TERM MECHANICAL PROPERTIES OF HIGH VOLTAGE COMPOSITE INSULATORS
(1985)
Abstract
The extensive use of. composite insulators for
transmission lines can ultimately be justified only on
long-term qualification tests. The results after three
years of long-term evaluation of composite insulators
subjected to uniaxial tensile loads are presented.
Three insulator designs with maximum failing loads in
excess of 450 kN were investigated at temperatures from
-25°C to 100°C. Based on the extrapolation of the time
to rupture results of the approximately three years of
testing, all three designs would, under similar conditions,
exceed the expected daily loadings. The slope
of the time to rupture versus load line on semi-log
plot varies from 12 kN to 25 kN per decade of time
depending on the insulator design.
