Phenolic Tubes in Generators: Applications and Selection Criteria

Applications of Phenolic Tubes in Generators Phenolic tubes are mainly used in insulation, protection, and structura...

Applications of Phenolic Tubes in Generators

Phenolic tubes are mainly used in insulation, protection, and structural support in generators. Made of phenolic resin with glass fiber or paper reinforcement and cured under high temperature and pressure, they combine excellent electrical, mechanical, and thermal properties, making them widely applied in generators.

1. Insulation Applications

Coil end insulation: Used to support and insulate the ends of stator windings, preventing turn-to-turn short circuits and discharge.

Conductor isolation: Serve as insulating sleeves between high- and low-voltage parts, ensuring electrical clearance and creepage distance, thereby improving operational safety.

Lead-out wire protection: Act as protective sleeves for generator leads passing through the core or housing, preventing abrasion and breakdown.

2. Mechanical Support and Fixing

End structure support: With high mechanical strength, phenolic tubes can support winding ends, withstanding electromagnetic forces and vibration.

Fasteners and insulating supports: Used as bolt sleeves and isolating posts instead of metal pipes, providing both strength and insulation.

3. Heat and Environmental Resistance

High temperature resistance: Typically rated for Class B (130 ℃) or Class F (155 ℃), suitable for the high-temperature environment inside generators.

Arc and corrosion resistance: Maintain stable insulation and mechanical performance under arcing, humidity, and oil contamination.

4. Typical Applications

Stator lead protection sleeves in medium and large synchronous generators.

Stator end insulation reinforcement rings.

Insulating spacers and sleeves for conductor through-holes.

Insulating sleeves for fastening bolts in motors and generators.

Phenolic Tubes Selection Guide

Key Selection Notes:

Thermal resistance: Select according to generator insulation class (commonly Class B 130 ℃ or Class F 155 ℃).

Mechanical properties: For stressed parts (end support, bolt sleeves), use high-strength phenolic glass-cloth tubes.

Electrical performance: For high-voltage areas, prioritize arc resistance and high dielectric strength.

Dimensional fit: Choose appropriate inner diameter/wall thickness for leads, through-holes, and bolts to avoid loose or overly tight fits that may affect performance.

Xujue Electrical is a professional manufacturer of high-quality electrical insulation materials with more than 65 years of manufacturing experience. If you need more product information and quotes, please contact us.