Application of Composite Apparatus Insulators at Substations: Policy, Driving Forces & Service Experience
While pollution levels in Sweden are relatively low, composite hollow core insulators are used for all circuit breakers and instrument transformers due to safety concerns. Although experience has been good, research was conducted to verify their condition after about 20 years’ service. By contrast, composite station post insulators have shown indications of problems. This presentation provides practical information on the policy and experience of the Swedish TSO using composite hollow core apparatus insulators and substation post insulators along with recommendations for detailed specifications for composite post insulators in order to maintain reliable long-term performance.