Ceramic Insulators Under Elevated Temperatures
Ceramic insulators can be subject to extreme temperatures linked to wildfires while lightning strikes and flashovers cause power arcs up to 19,000°C. Operating conditions also play a role since conductors can reach elevated temperatures during line over currents. Insulators are designed to operate within the normal temperatures of the equipment they support and not expected to withstand extremes without risk of reduced mechanical and dielectric strength. They may need to be inspected to assess such damage. This presentation will outline the points that must be reviewed on insulators exposed to elevated temperatures and explain how each material reacts based on how the heat was applied as well as its design and construction.