Premium Class-F (155°C) Enameled Rectangular Wire engineered for oil-immersed transformers.
High thermal stability, exceptional oil resistance, and production-friendly surface finishes make this wire ideal for power, distribution, and instrument transformers requiring long service life under oil-immersed operating conditions.
Product Details
Enameled rectangular wire is made of electrical aluminum rod, which are drawn or extruded by the specification mould, it is the baked winding wire with multiple -layers of insulating paint after annealing softening treatment, They are mainly used in the winding of electrical equipment such as transformer, reactor and etc.Soft aluminum rectangle wire of enameled rectangle wire complies with the provisions of GB5584.3-2009.when 20'C.
- Resistivity: < 0.02801 Ω·mm²/m.
- According to different insulation requirements, thin film insulation from 0.06 to 0.11 mm or thick film insulation from 0.12 to 0.17 mm can be selected.
- The thickness of the self-adhesive layer of hot adhesive enameled rectangular wire is generally 0.03 to 0.06 mm. Our company monitors the thickness using a dielectric loss meter.
Enameled Rectangular Wire Range
Wire thickness 0.80~5.60mm, Conductor width ratio 20:1
Wire width 2.00~16.00mm ,Implementation standard GB/T 7095.5-2008/IEC 60851
If the selected specifications exceed the above range, please contact us. We can customize according to customer's technical requirements.Can be customized according to customer technical requirements.
| Paint film | Min. breakdown voltage value(effective value):V | |
| Room temperature | High temperature | |
| Grade1 | 1000 | 750 |
| Grade2 | 2000 | 1500 |
Enameled Rectangular Wire Technical Parameter
| Enameled wire category | Thermal level | Performance | Standard | Experimental basis |
| Polyvinylacetal/Selfadhes iveacetal | 120 | Good performance of resistance to transformer oil and scratch.Excellent flexibility&adhesion,and good hydrolysis resistance In addition to the properties of acetal wire,the product adhesive strength can be reinforced by heating | GBJ 7095.2-2008 IEC60317-18:2004 GBfF 6758.1-2007 IEC 60851-5 | GB/T4074 IEC 60851 GB/T4074 IEC 60851 |
| Polyester | 130 | High mechanical strength,good scratch resistance.Good electrical performance | GBAT 7095.7-2008 IEC60317-11:2005 | GB/T4074 IEC 60851 |
| Modifiedpolyester | 155 | Good shock resistance.High mechanical strength,good electrical&solvent resistance | GBfF 7095.3-2008 IEC60317-16:1990 | GB/T4074 IEC 60851 |
| Polyesterimide | 180 | High hear resistance, good chemical solvent resistance,and heat shock resistance | GBfT 7095.4-2008 IEC60317-28:1990 | GB/T4074 IEC 60851 |
| Polyesterimide/polyamide imidecompositelayer | 200 | Good comprehensive properties,such as refrigerant resistance,solvent resistance and radiation resistance | GB/T 7095.6-2008 IEC60317-29:1990 | GB/T4074 IEC 60851 |
| Polyamideimide | 220 | Good chemical solvent resistance | GB/T 7095.1 | GB/T4074 IEC 60851 |
If you have other Transformer Winding Wire customization requirements, please contact us！
· Extended transformer lifespan through higher thermal endurance
· Improved insulation reliability in oil-immersed operating conditions
· Reduced manufacturing and maintenance costs
· Enhanced winding efficiency for manual or automated coil production
· Flexible design options for various transformer structures
· Oil-immersed distribution transformers
· Power transformers
· Instrument transformers
· Reactors and inductors
· Transformer rewinding and repair services
We support customized solutions based on your transformer design and production requirements:
· Conductor material selection (copper or aluminium)
· Wire size and profile customization
· Insulation thickness and performance adjustment
· Packaging and logistics solutions for bulk orders
Contact us today to request samples, technical data, or a quotation.
Our technical team will help you select the optimal Grade 155 oil-immersed Enameled Rectangular Wire for your transformer application.
Enameled Rectangular Wire Characteristics
1. Excellent heat dissipation performance
-Support for higher load capacity and longer overload time.
2. High insulation reliability
-Combine with insulating paper or epoxy resin coating to form a multilayer insulation barrier suitable for high voltage grade applications .
3. Strong mechanical stability
-Seismic design adapted to harsh environment.
4. Overload resistance and aging resistance
-High temperature resistant materials support short time overload operation.
5. Noise reduction and environmental protection
-Modern environmentally friendly insulating oils can be degraded to reduce the risk of leakage and pollution.
Designed specifically for oil-immersed transformer environments.
This Grade 155 winding wire is built with a Class F insulation system rated for continuous operation at elevated temperatures, providing reliable performance and extended transformer service life.
Excellent resistance to transformer oil and chemical media.
The insulation system is optimized to resist degradation caused by transformer oil, varnishes, and solvents, helping maintain dielectric strength and mechanical stability over long-term operation.
Balanced performance between thermal endurance and cost efficiency.
Grade 155 winding wire is widely used in oil-immersed transformers as a reliable solution that offers higher thermal margins than Class B while maintaining competitive material costs.
Production-friendly surface and winding performance.
The enamel coating provides smooth winding behavior, strong adhesion, and optional solderable performance, supporting efficient coil manufacturing and reducing processing time.
Suitable for new transformer manufacturing and rewinding projects.
This special winding wire meets the practical requirements of oil-immersed transformer production, maintenance, and refurbishment applications.
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