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High-Quality Enameled Flat Copper/Aluminum Wire for Transformers - China Suppliers & Factory
Product Information
Engineered specifically for transformer windings, this enameled flat wire is crafted from high-conductivity oxygen-free copper or electrical aluminum rod, processed through precision drawing and extrusion to meet the strict requirements of transformer operation. It is widely used in power transformers, distribution transformers, and special transformers, providing excellent insulation, conductivity, and thermal stability. Based on the insulating paint's performance, it is divided into six specialized categories:
- QQ / QQN 120℃ Polyvinyl Acetal / Self-adhesive Polyvinyl Acetal Enameled Flat Wire — excellent transformer oil resistance
- QZ 130℃ Polyester Enameled Flat Wire — high mechanical strength for transformer windings
- QZG 155℃ Modified Polyester Enameled Flat Wire — good shock resistance for stable transformer operation
- QZY 180℃ Polyester Imide Enameled Flat Wire — high heat resistance for high-power transformers
- Q(ZY/XY) 200℃ Polyester Imide / Polyamide-Imide Composite Enameled Flat Wire — comprehensive performance for harsh transformer environments
- QXY 220℃ Polyamide Imide Enameled Flat Wire — superior chemical resistance for special transformers
Transformer-Adapted Specifications
| Parameter | Range / Value | Note |
|---|---|---|
| Conductor Thickness (a) | 0.80 – 5.60 mm | Matches common transformer winding designs |
| Conductor Width (b) | 2.00 – 16.00 mm | Optimized for winding density |
| Insulation Thickness — Thin Film | 0.06 – 0.11 mm | Balances insulation and space efficiency |
| Insulation Thickness — Thick Film | 0.12 – 0.17 mm | |
| Self-adhesive Layer (QQ/QQN) | 0.03 – 0.06 mm | Enhances winding adhesion in transformers |
Detail Shot
Performance for Transformers
- ✅ Copper conductors comply with GB5584.2-2009, with low resistivity (≤0.017241 Ω·mm²/m at 20℃) to reduce transformer energy loss.
- ✅ Aluminum conductors meet GB5584.3-2009, offering lightweight solutions for medium and low-power transformers.
- ✅ All insulation types pass transformer-specific tests, including resistance to transformer oil (QQ/QQN) and heat shock (QZY), ensuring long-term reliability.
- ✅ Hengte Electric is a professional supplier of transformer components, holding ISO9001:2015 certification. Products have passed SGS, UL, and CE tests, meeting international transformer industry standards. We accept custom specifications to match different transformer models and power ratings.
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Frequently Asked Questions
Q
What is the difference between the six types of enameled flat wire, and how do I choose the right one for my transformer?
Each type is classified by its insulating paint's thermal class and chemical properties. For standard distribution transformers immersed in oil, QQ/QQN (120℃) is recommended. For high-power or high-temperature applications, QZY (180℃) or Q(ZY/XY) (200℃) offer superior thermal stability. For the most demanding special transformers, QXY (220℃) provides the best chemical and heat resistance. Please consult our team with your transformer's rated temperature and operating conditions for a precise recommendation.
Q
Can you produce enameled flat wire with custom conductor dimensions to match a specific transformer design?
Yes. We accept custom specifications within our standard range — conductor thickness (a) from 0.80 to 5.60 mm and conductor width (b) from 2.00 to 16.00 mm — as well as custom insulation thickness selections (thin or thick film). Please provide your transformer's winding design parameters and we will confirm feasibility and lead time.
Q
What conductor material options are available, and which is better for transformer applications?
We offer both high-conductivity oxygen-free copper (compliant with GB5584.2-2009) and electrical-grade aluminum (compliant with GB5584.3-2009). Copper conductors provide lower resistivity (≤0.017241 Ω·mm²/m at 20℃), making them ideal for high-efficiency power and distribution transformers. Aluminum conductors are lighter and more cost-effective, making them suitable for medium and low-power transformer applications where weight reduction is a priority.
Q
What international certifications does the enameled flat wire comply with?
Our enameled flat wire products are manufactured under ISO 9001:2015 quality management standards and have passed SGS, UL, and CE third-party testing, ensuring compliance with international transformer industry requirements. We can provide full test reports and certification documents upon request.
Q
What is the purpose of the self-adhesive layer in QQ/QQN enameled flat wire?
The self-adhesive layer (0.03–0.06 mm) in QQ/QQN wire allows the winding layers to bond together under heat and pressure during transformer manufacturing. This improves mechanical stability of the coil, reduces vibration and noise during transformer operation, and enhances resistance to deformation under short-circuit conditions.
Q
How does the insulation film thickness (thin vs. thick) affect transformer winding performance?
Thin film insulation (0.06–0.11 mm) maximizes the conductor fill factor within a given winding window, improving power density and efficiency. Thick film insulation (0.12–0.17 mm) offers higher dielectric withstand voltage and better mechanical protection, making it more suitable for transformers operating in high-voltage or mechanically demanding environments. The choice depends on your transformer's voltage rating, winding space, and operating conditions.