Advanced seismic resilience of composite insulators for High Voltage substations

Composite insulators, including solid-rod and hollow-core designs, offer inherent mechanical advantages under seismic loading due to their low mass, high flexibility, and enhanced energydissipation capability. Their increasing application in high-voltage substations has been formally recognised in the latest revision of IEEE Std 693-2018 [1], which introduces specific guidance and acceptance criteria for composite insulation systems.