0102030405
China Suppliers Factory for Paper Covered Copper 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/Month — Telephone Paper Covered Aluminum/Copper Round Wires & Strips
Packaging & Delivery
📦 Packaging Details: Paper Coated Flat Copper Wire
Inner Packing: 30 / 50 / 150kg wooden spool — different wooden spools according to wire diameters
Outer Packing: Wooden case or as per customer's special requirement
🚢 Port: Qingdao, Shanghai, Tianjin
⏱ Lead Time:
1 – 500 kgLess than 10 days
> 500 kg15 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, the aluminum conductor is wound with three or more layers of cable paper or telephone paper. 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. According to customer requirements, it can be divided into phone paper, cable paper, high voltage cable paper, and other winding insulation types.
Telephone cable paper covered aluminum wire, also known as plain paper covered insulated aluminum. According to customer requirements, the aluminum conductor is wound with three or more layers of cable paper or telephone paper. 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. According to customer requirements, 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
QWhat types of insulation paper are available for the paper coated flat copper wire?
AThe wire is available with multiple insulation paper options including kraft paper, 3M paper, telephone cable paper, MIKITOKU paper, and NOMEX. Customers can choose the appropriate type based on their specific application requirements.
QWhat is the thermal class rating of the paper coated flat copper wire?
AThe wire carries a thermal class rating of 105℃, which is achieved after the oil immersion process. This makes it suitable for use in oil-immersed transformer windings and similar electrical coil applications.
QWhat conductor materials and dimensions are available?
AThe conductor is available in both copper and aluminum. For round wire, the diameter ranges from 2.0 to 7.0mm. For flat wire, the dimensions are: width (a) 0.8–5.6mm and height (b) 2.0–16mm, covering a wide range of transformer winding requirements.
QWhat certifications does the paper coated flat copper wire hold?
AThe product is certified under UL, SGS, RoHS, and ISO9001, and complies with international standards including IEC, NEMA, GB, and JIS. These certifications ensure consistent quality and global market acceptance.
QWhat are the packaging options and lead times for orders?
AThe wire is packed on 30kg, 50kg, or 150kg wooden spools as inner packaging, with outer wooden cases available. Custom packaging is also accepted. For orders of 1–500kg, delivery takes less than 10 days; for orders exceeding 500kg, the lead time is approximately 15 days. Shipment is available via Qingdao, Shanghai, or Tianjin ports.
QIs OEM production supported, and what is the monthly supply capacity?
AYes, OEM production is fully supported. The factory has a monthly supply capacity of up to 1,500 tons of telephone paper covered aluminum/copper round wires and strips, ensuring reliable supply even for large-volume orders.