Mr. Maloney holds a BS ME degree from Purdue University and has worked for PPC Insulators for the past 19 years, coordinating product testing, quality and application engineering. He is active in American Standards Committees, including NEMA and C29 insulator Working Groups.
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.