چكيده لاتين :
Room temperature vulcanizing (RTV) silicone rubber is widely used to coat glass
and porcelain insulators to prevent surface flashover on the insulators that are
heavily contaminated with industrial pollution and exposure to humidity in the
coastal areas which may lead to outages of the power system. Fillers such as alumina
trihydrate (ATH) and silica are also used in these coatings to provide tracking and
erosion resistance. Therefore, a formulation of RTV coating system should be developed
to optimize its performance and in particular to extend its lifetime. In this work, RTV coatings
with different quantities of ATH and silica fillers were applied to porcelain suspension
insulator. They were then artificially contaminated and exposed to dry and wet conditions.
Moreover, contact angle measurements were performed to determine the state of the surface.
To carry out surface characteristic studies of the coatings filled with ATH and silica,
the samples were gold coated for SEM observation. In addition, TGA was utilized to
investigate the role of ATH in RTV samples. The test results are reported on the basis of
the role of ATH and silica fillers. The results showed that when ATH is used as filler the
highest performance belongs to the sample with 70 pph ATH. Addition of 10 pph silica
also improves the performance of coatings at ATH quantity between 35 to 70 pph, but
replacement of 10 pph ATH with the same amount of silica was not productively efficient
