A pillar insulator is a specialized insulating component that plays a crucial role in overhead transmission lines. In earlier years, pillar insulators were commonly used on utility poles, and gradually evolved to include many suspended insulators at the top of tall high-voltage transmission towers. These are intended to increase the creepage distance. Typically made from silicone or ceramic, they are referred to as insulators. Insulators serve two fundamental functions in overhead transmission lines: supporting conductors and preventing current from returning to the ground. Both of these functions must be ensured, as insulators should not fail due to flashover breakdown caused by changes in environmental and electrical load conditions. Otherwise, the insulator would lose its effectiveness, potentially damaging the entire line's usage and operational lifespan.