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 of 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. These functions must be ensured, as insulators should not fail due to changes in environmental and electrical load conditions, which could lead to flashover breakdown. Otherwise, the insulator would lose its effectiveness, damaging the entire line's usability and operational lifespan.