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Substations were either solid core porcelain or composite insulIn the past, the main options for support insulators at air-insulated HVAC ators up to 245 kV. In addition, RTV coatings have at times been applied to solid core porcelain post insulators to improve their pollution performance. New developments have recently been made when it comes to gas or foam-filled hollow core composite insulators as well as larger core diameters on solid core composite insulators. Nevertheless, the requirements for EHV and UHV AC installations in terms of length, mechanical strength, permissible deflection, creepage distance, shed profile and pollution performance still present a …