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 designed 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 the conductors and preventing current from returning to the ground. These functions must be guaranteed, as insulators should not fail due to changes in environmental and electrical load conditions, leading to flashover breakdown. Otherwise, the insulator would lose its effectiveness, damaging the entire line's usability and operational lifespan.