Silicone rubber polymer insulators housed nonceramic insulators were studied after field aging in various service environments for periods of from 7 years to more than 10 years. The condition of the aged silicone rubber was compared to that of new material for insulator, focusing on the characteristics of hydrophobicity recovery and contaminant encapsulation by low molecular weight polymer. The field aged materials are shown to exhibit hydrophobicity characteristics comparable to those of new, unaged silicone rubber for composite insulator.
The rod design of silicone rubber polymer insulators:
◆ The glass fibre reinforced epoxy resin rod (GRP rod) must comply with the requirements of IEC 61109.
◆ The rod of silicone rubber insulators must take over all mechanical properties. The surface of the rod must be even and homogenous.
◆ Inclusions of foreign matter or cavities in the material are inadmissible.
◆ The stability of the GRP rod against hydrolysis must be ensured.
◆ Furthermore, the glass fibres of polymer insulators must be stable against acids in order to prevent stress corrosion cracking of the GRP rod.
◆ The rod material of silicone rubber polymer insulators must at least show a high voltage diffusion puncturing strength.
◆ The composition of the epoxy resin mixture must prevent hydrolysis and acid formation.
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