0102030405
China Suppliers Factory for Paper Covered Copper Flat Wire for Oil-Immersed Transformers
Product Information
Place of Origin:Jiangsu, China
Brand Name:Hengte Electric Wire
Model Number:Paper Coated Flat Copper Wire
Type:Insulated
Application:Oil-immersed transformer, rectifier, reactors winding
Conductor Material:Copper or Aluminum
Conductor Type:Solid
Insulation Material:Kraft paper, 3M paper, Telephone cable paper, MIKITOKU paper
Diameter:Round: 2.0–7.0mm; Flat: a: 0.8–5.6mm, b: 2.0–16mm
Certification:UL, SGS, RoHS, ISO9001
OEM:Yes
Thermal Class:105℃
Insulation Paper:Cable paper / Telephone paper / Insulation paper / NOMEX
Standard:IEC, NEMA, GB, JIS
Main Application:Oil-immersed transformer windings
Bobbin:30kg / 50kg / 150kg wooden spool or as per customer requirements
Supply Ability:1,500 Ton per Month
Packaging & Delivery
📦 Inner Packing: 30 / 50 / 150kg wooden spool — different wooden spools available according to wire diameter.
🪵 Outer Packing: Wooden case or as per customer's special requirements.
🚢 Port: Qingdao, Shanghai, Tianjin
⏱ Lead Time:
📦 1 – 500 kg | < 10 Days
🚚 > 500 kg | 15 Days
Telephone cable paper / 3M paper / MIKITOKU covered wire — oil immersed transformer winding wire.
Telephone cable paper covered aluminum wire, also known as plain paper covered insulated aluminum. According to customer requirements, three or more layers of cable paper or telephone paper are wound around the aluminum conductor. Plain paper covered wire is a special material for oil-immersed transformer coils and similar electrical coils, with a temperature index of 105℃ after immersion. It can be divided into phone paper, cable paper, high voltage cable paper, and other winding insulation types.
Product Tech Information
| Project Name | Standard | Test Tool |
| Conductor size and R corner radius | Follow standard of GB/T7673.1-87 | Micrometer and R type |
| Bend | The specimen is not cracked, no crack, no obvious sticking out of the paper according to the standard curve. | Experimental round rod and flat wire bending apparatus |
Paper Covered Round Wire Insulation Thickness
| Standard Insulation Thickness (mm) | 0.30 | 0.45 | 0.80 | 1.20 | 1.80 | 4.25 |
| Tolerance (mm) | ±0.05 | ±0.05 | ±0.10 | ±0.12 | ±0.15 | ±0.30 |
Paper Covered Flat Wire Insulation Thickness
| Standard Insulation Thickness (mm) | 0.45 | 0.60 | 0.95 | 1.35 | 1.60 | 1.95 | 2.45 | 2.95 |
| Maximum Insulation Thickness (A-a) | 0.57 | 0.74 | 1.14 | 1.56 | 1.84 | 2.23 | 2.77 | 3.32 |
| Minimum Insulation Thickness (B-b) | 0.40 | 0.53 | 0.85 | 1.20 | 1.45 | 1.80 | 2.30 | 2.75 |
Frequently Asked Questions
Q What types of insulation paper are available for Paper Coated Flat Copper Wire?
The wire supports multiple insulation paper options including kraft paper, 3M paper, telephone cable paper, MIKITOKU paper, high voltage cable paper, and NOMEX insulation paper. Customers can specify their preferred insulation type based on application requirements.
Q What are the main applications of Paper Coated Flat Copper Wire?
This wire is primarily used for oil-immersed transformer windings. It is also suitable for rectifiers, reactors, and other similar electrical coil applications that require reliable paper insulation at a thermal class of 105℃.
Q What conductor materials and sizes are available?
Both copper and aluminum conductors are available. For round wire, the diameter ranges from 2.0 to 7.0mm. For flat wire, dimension "a" ranges from 0.8 to 5.6mm and dimension "b" ranges from 2.0 to 16mm.
Q What certifications does the product hold?
The Paper Coated Flat Copper Wire is certified under UL, SGS, RoHS, and ISO9001 standards. It also complies with international standards including IEC, NEMA, GB, and JIS.
Q What packaging options are available and what is the lead time?
The wire is packed on 30kg, 50kg, or 150kg wooden spools as inner packaging, with wooden cases for outer packaging. Custom packaging is also available. Lead time is less than 10 days for orders of 1–500kg, and approximately 15 days for orders exceeding 500kg.
Q Is OEM service available, and what is the monthly supply capacity?
Yes, OEM service is available. The monthly supply capacity is up to 1,500 tons of Telephone Paper Covered Aluminum/Copper Round Wires and Strips, ensuring reliable and large-scale production for global customers.