Epoxy Winding Tube
The epoxy glass fiber winding tube, made from high-quality glass fibers and epoxy resin, is used for composite bushings in high-voltage SF6 equipment and transformers. Our company supplies tubes for voltages from 40.5KV to 550KV.
1. Product Features
The epoxy glass fiber winding tube is made from high-quality glass fibers impregnated with ultra-low viscosity, high-temperature-resistant epoxy resin, cross-wound under microcomputer control. It is a premium raw material for manufacturing composite hollow bushings for high-voltage and ultra-high-voltage SF6 electrical equipment and current transformers. Over the years, our company has been a supplier to numerous well-known high-voltage electrical switch manufacturers worldwide, offering winding tubes in various specifications ranging from 40.5KV to 550KV voltage levels. We also supply winding tubes in various specifications to many transformer tap changer manufacturers globally.
Specifications of Epoxy Glass Fiber Winding Tubes: φ57, φ60, φ64, φ66, φ76, φ83, φ92, φ100, φ103, φ110, φ135, φ145, φ170, φ176, φ188, φ190, φ220, φ240, φ248, φ325, φ370, φ400, φ500, φ600
2. Product Description
- The diameter of the epoxy glass fiber winding tube refers to its inner diameter, based on our company's standards. The outer diameter and length can be customized according to customer requirements. We can also manufacture products according to specific customer needs.
- The glass fiber-reinforced winding structure and optimized mechanical sub-layer design of the epoxy glass fiber winding tube result in high bending strength and excellent mechanical properties, making it suitable for use in seismically active regions.
- The tube's high-temperature-resistant resin makes it ideal for manufacturing hollow bushings in SF6 high-voltage circuit breaker arc chambers under high-temperature and high-pressure conditions.
- The epoxy glass fiber winding tube is resistant to corrosion by SF6 gas decomposition products and compounds.
- It boasts excellent insulation properties with a partial discharge less than 5pC.
- Suitable for use in SF6 high-voltage switchgear and current transformer composite hollow bushings.
- Suitable for use in transformer tap changers.
- Various specifications of winding tubes can be provided based on user designs.
- The winding tubes provided by our company are based on the inner diameter standard, with the outer diameter and length customizable according to user needs.
3. Technical Parameters of Epoxy Glass Fiber Winding Tube
| No. | Indicator Name | Unit | Index |
| 1 | Density | g/cm3 | 1.9-2.05 |
| 2 | Flexural Strength | M Pa | >176.4 |
| 3 | Compressive Strength | M Pa | >200 |
| 4 | Shear Strength | M Pa | >40 |
| 5 | Dielectric Loss Factor (20Hz) | <0.005 | |
| 6 | Dielectric Constant | 3-5 | |
| 7 | Volume Resistivity | ||
| In Normal Condition | Ω.m | 3.0×1012 | |
| After Immersion in Water | Ω.m | 2.8×1012 | |
| 8 | Insulation Resistance (Parallel to Layers) | ||
| In Normal Condition | Ω.m | 5.2×1012 | |
| After Immersion in Water | 3.6×1012 | ||
| 9 | Surface Dielectric Strength (1 minute in air, 30 mm spacing) | KV | ＞15 |
| 10 | Vertical Layer Dielectric Strength (5 minutes in transformer oil at 90±2°C) | KV | |
| δ≤3 mm | 18 | ||
| δ＞3 mm | 20 | ||
| 11 | Parallel Layer Dielectric Strength (5 minutes in transformer oil at 90±2°C, with a 35 mm gap) | KV | ＞75 |
