What is one of the typical materials used in dry-type transformer insulation?

The typical material used in dry-type transformer insulation is paper. This is because paper offers excellent electrical insulating properties, is readily available, and provides good thermal conductivity. Furthermore, the cellulose fibers in paper can withstand high temperatures while maintaining their insulating properties, making them suitable for the thermal and electrical demands of dry-type transformers.

Dry-type transformers are designed to operate in environments without the need for liquid insulation fluids, and paper insulation can effectively manage the heat generated during operation. Additionally, paper can be treated and impregnated with different compounds to enhance its insulating properties and durability, increasing its effectiveness in this application.

Other materials like silicone oil, wrapped glass fiber, and ceramic coatings do have their specific applications in other technologies but are not typically used for insulation in dry-type transformers. Silicone oil, for example, is more often used in liquid-filled transformers, while glass fiber is more common in structural applications rather than electrical insulation. Ceramic coatings may provide protection against environmental factors but do not serve as the primary insulation material in dry-type transformers.