Abstract
Long-term field experiences of ageing and
performance of polymeric silicone rubber (SIR) and
ethylene-propylene-diene monomer (EPDM) insulators
under natural contamination conditions in an outdoor
station are presented. The primarily aim of the work is to
study the interrelation between surface conditions and
the electrical performance of polymeric insulators. In
this paper the leakage current statistics, the hydrophobicity
and the surface conditions of six SIR and three
EPDM commercially available insulators are studied in
detail. The surface conditions were studied using electron
spectroscopy for chemical analysis (ESCA), attenuated
total reflection fourier transform infrared (ATRFfIR)
spectroscopy and scanning electron microscopy
(SEM). The results show a strong interrelation between
the conditions of the insulator surface, especially the
hydrophobicity, and the performance with respect to
leakage currents and electric withstand.
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