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Power transmission reliability and system integrity are essential requirements in high voltage transmission and distribution networks. Outdoor insulation has a critical role, since the majority of these installations incorporate open air systems and there are many factors able to trigger deterioration mechanisms, which may finally conclude to a system failure. It is important to notice, that although the initial investment for the insulation systems is low in comparison to other types of equipment, an insulation failure may result in considerable costs for the utility. A strategy that is followed by more and more utilities nowadays is the incorporation of composite insulators, in transmission and distribution systems, where the influence of pollution is considerable. In Crete, this action started 37 years ago, experienced intense action; 15 years ago and today the majority of outdoor insulators are composite. This large scale application is presented in this paper, especially with reference to the problems experienced and the testing and maintenance procedures applied. Kiriakos Siderakis et al. Composite Outdoor High Voltage Insulators in Crete... 375

Composite Outdoor High Voltage Insulators in Crete - 37 Years of Experience