Introduction
In modern power transmission and distribution systems, insulation materials directly affect the reliability and service life of electrical equipment. Statistics show that nearly 40% of transformer failures are related to insulation problems (CIGRE Technical Brochure 642, 2015). To minimize these risks, high-performance insulating materials such as the epoxy fiberglass winding tube have become essential in transformer design and manufacturing.
An epoxy fiberglass winding tube is a cylindrical insulating component manufactured by impregnating fiberglass cloth with epoxy resin under high temperature and pressure. After curing, the material achieves high rigidity, excellent dielectric strength, and good thermal endurance.
Key properties of epoxy fiberglass tubes (typical values):
• Dielectric strength: ≥ 11.6 kV/mm
• Flexural strength: ≥ 400 MPa
• Thermal class: H (180°C)
• Water absorption: ≤ 1
These properties enable epoxy fiberglass tubes to withstand harsh operating conditions in transformers.
Epoxy fiberglass winding tubes are widely applied in dry-type and oil-immersed transformers, as well as in reactors and large motors. Their main functions include:
1. Winding insulation – Serving as reliable insulation barriers between low-voltage and high-voltage windings.
2. Mechanical support – Acting as coil formers or winding mandrels, providing dimensional stability.
3. High-voltage insulation – Preventing dielectric breakdown under operating voltages up to several hundred kilovolts.
4. Structural reinforcement – Withstanding the mechanical stress caused by short-circuit currents.
Compared to traditional materials such as phenolic tubes or paper-based laminates, epoxy fiberglass winding tubes offer:
• Higher mechanical strength – Up to 2–3 times stronger in flexural resistance than paper laminates.
• Superior heat resistance – Maintains insulation properties at 180°C, suitable for dry-type transformers operating under high load.
• Moisture resistance – Less than 1% water absorption ensures stable dielectric strength even in humid environments.
• Custom processing – Can be easily machined, cut, or produced in various diameters and thicknesses.
• Longer service life – Reduces transformer failure rate, lowering total lifecycle costs.
As a professional insulation material manufacturer, XuJue provides custom epoxy fiberglass winding tubes for transformers, meeting IEC, NEMA, and RoHS standards.
• Wide range of specifications: inner diameter 10–500 mm, wall thickness 1–20 mm
• Consistent dielectric and mechanical performance tested by ISO-certified labs
• Global supply to over 50 countries in power and electrical industries
• Technical support and customized machining services
The epoxy fiberglass winding tube for transformers is a high-performance insulation solution that ensures safety, reliability, and durability in power equipment. With superior dielectric strength, mechanical stability, and thermal endurance, it significantly reduces insulation-related failures in transformers.
For custom epoxy fiberglass insulation tubes tailored to your transformer design, contact XuJue for technical consultation and quotations.
