COMPOSITE INSULATORS WITH SILICONE RUBBER HOUSING FOR USE IN THE 230 KV OVERHEAD
LINE BETANIA-MlROLINDO IN INTERCONEXION ELECTRICA S.A. (ISA), COLOMBIA
(1997)Abstract
The increased use of composite insulators in RV
transmission lines is based on the advantages of these
insulators and the results of long term experience gained
with particular insulator dcsigns. Silicone rubber and EP
rubber are the dominant housing materials for composite
insulators. Silicone rubber is considered to be the best
material for RV outdoor insulation, proven by service
experience. Due to a lack of adequate accelerating test
methods the selection of composite insulators for the
application at a particular site can only rely on long term
!'en'ice experience under operational conditions obtained
from other sites. This experience revealed the ~uperiority of
silicone ruhber compared to EP rubber and conventional
insulators and can beiraced back to an interaction of the
silicone rubber with the poI1ution particles, not known from
other materials. The hydropbobicity transfer prevents
silicone rubber insulators from electrical degradation. Thus,
ISA decided to specifY composite silicone insulators of a
particular design for the 230 kV line Betania - Mirolindo.
The line runs through a mountain area up to 1 200 m. For
lhis line composite silicone rubber insulators offer besides
ofreclmical advantages also economical benefits.
Apart from the design ISA specified test sequences
described in me 1109. The acceptance test report was
demanded before supply and taking over the insulators. TIle
tests were carried out in the test facilities 'of the
manufacturer and comprised electrical and mechanical
testing as well. All tests were passed by the insulators and
i.nsuIator strings respectively.
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