Pillar composite insulators are a new generation of power equipment that use advanced composite materials—such as silicone rubber and polymer compounds—as their insulating medium, and are widely applied in high-voltage transmission lines of 220 kV and above. Compared with traditional porcelain or glass insulators, composite insulators offer distinct advantages including light weight, excellent seismic resistance, superior anti-pollution performance, and high aging resistance, making them a reliable and maintenance‑friendly solution for modern power systems. Designed for AC applications up to 500 kV, these insulators combine electrical and mechanical strength with long‑term durability, ideal for use in substations and transmission projects where performance and safety are paramount.