What is the paper covered magnet wires
Paper covered magnet wires refers to a winding wire that is made of an oxygen-free copper rod or an electrical aluminum rod that is drawn and extruded into a conductor, or a winding wire that is wrapped with an insulating material after the conductor is coated with insulating varnish.
The paper-wrapped combined wire is a winding wire made of two or several bare copper (aluminum) wires, paper-wrapped wires, enameled wires or their combinations arranged according to requirements and then wrapped with specific insulating materials.
Paper covered magnet wires and paper-wrapped combined wire are the main winding materials used in the manufacture of power transformers, reactors and distribution transformers.
The specification of paper covered magnet wires
Paper covered conductor
| Bare wire Round wire | Φ0.6mm-Φ16.00mm |
| Bare wire Flat wire | conductor thickness dimension a is 1.00mm-16.00mm |
| conductor width dimension b is 2.00mm-25.00mm | |
| Enamelled round wire | diameter: Φ0.6mm-Φ6.00mm |
| Enamelled Flat wire | conductor thickness dimension a is 1.00mm-3.50mm |
| conductor width dimension b is 4.00mm-16.00mm |
Paper wrapped combined wire conductor
| Bare wire (paper package) combined conductor | single conductor thickness dimension a is 1.00mm-4.00mm |
| conductor width dimension b is 4.00mm-20.00mm | |
| Semi-rigid combination wire conductor | single conductor thickness dimension a is 1.00mm-3.50mm |
| conductor width dimension b is 4.00mm-18.00mm |
Enameled wire conductor for enamelled combination
Flat wire: conductor thickness dimension a is 1.00mm-3.50mm, conductor width dimension b is 4.00mm-16.00mm
Paint film thickness
Acetal (polyesterimide, polyamideimide) paint film generally chooses 0.10-0.16mm, self-adhesive paint film thickness generally chooses 0.03-0.05mm, and different thermal grade self-adhesive can be selected according to the requirements of use conditions paint, also can choose wide-edge single-sided (double-sided) self-adhesive.
The maximum number of wrapping layers at a time
Paper bag 24 layers; combination: 4 layers inside and 16 layers outside.
If the customer needs special conductor width, thickness, insulation thickness, and number of combinations, it can be produced according to customer requirements.
Conductor material
Resistivity:Annealed copper wire is not more than 0.017241Ω•mm2/m at 20°C
Annealed aluminum wire not greater than 0.028000Ω•mm2/m at 20°C
Copper wire stipulates non-proportional extension strength Rp0.2 production range:
Soft state is less than 100 N/mm2, semi-hard state is 100-300 N/mm2, semi-hard copper Rp0.2 deviation can be controlled within +0-20 N/mm2.
Insulation materials
Wrapping materials：Power cable paper, high-density insulating paper, heat-resistant insulating paper, micro-wrinkled paper, aromatic polyamide paper (NOMEX410 paper) and various self-adhesive papers, PET film, Finnish paper, imported micro-wrinkled insulating paper (dennis pine paper), other special insulating materials.
Materials for enameled wire：High-strength acetal varnish, polyesterimide, polyesterimide/polyamideimide varnish, self-adhesive varnish.
Insulation thickness and number of layers：Any thickness and number of layers can be packaged，The user can specify the brand, model and specification of the insulating material.
Paper covered wire production standards：IEC, NEMA, GB, JIS
The insulation thickness and breakdown voltage of Chalco paper covered magnet wires
| Insulation thickness/mm | Breakdown voltage/V (Min) | |
| Nominal value | Tolerance | |
| 0.15 | ±0.03 | 5000V |
| 0.2 | ±0.03 | |
| 0.23 | ±0.03 | |
Strengths of Chalco paper covered magnet wires
Paper covered aluminum wires has the advantages of smooth conductor surface, uniform size and tensile strength, and low resistivity.
Paper insulated Aluminum Wires has excellent voltage resistance performance and thin insulation thickness, and the heat resistance performance can reach up to 220°C.
Paper covered aluminum conductors has excellent abrasion resistance and solvent resistance.
Paper wrapped aluminium wire has excellent electrical properties.
Paper covered aluminum strip has excellent withstand voltage performance in oil.
Paper covered winding wire has excellent thermal shock resistance, adhesion and flexibility.
Increase the filling factor of the transformer.
Reduce the volume and cost of the transformer.
The classification of Chalco paper covered magnet wires
Several classifications of paper covered magnet wires
Wrapping products of paper covered magnet wires
Paper covered flat aluminum wire,
Rectangular paper covered aluminum strip,
Paper-wrapped flat (round) wires,
Paper-wrapped combined wires,
Paper-wrapped enameled wires,
Paper-wrapped enameled combined wires,
Paper-wrapped wires of special insulating materials,
Combined wires of paper-wrapped special insulating materials,
Ester film non-woven fabrics Covered wire,
Imide film paper covered wire,
High voltage lead wire,
Cable paper covered aluminum wire
Telephone paper covered aluminum wire,
3M paper covered alumnium wire
NOMEX paper covered aluminum wire,
High-voltage paper covered aluminum wire
Inner turn insulation paper covered aluminum wire etc.
According to the conductor metal material, it is divided into: copper, aluminum.
According to the paper-wrapped single wire, it is divided into: bare wire paper-wrapped wire, enamelled paper-wrapped wire.
According to the combined wire and single wire conductor, it is divided into: bare wire combination, paper covered wire combination, enameled wire combination (the enameled wire types include acetal enameled wire, acetal self-adhesive enameled wire, acetal self-adhesive (single-sided) enameled wire, polyesterimide enameled wire, poly Esterimide/polyamideimide composite enameled wire/polyimide).
According to the number of combined wires, it is divided into: 2 combined wires, 3 combined wires.
According to the arrangement of combined single lines, it can be divided into: radial combination and axial combination.
According to the winding method of the reel: flat winding and vertical winding.
The common types of paper covered magnet wires
Nomex paper covered wire (copper, aluminum)
Its insulating structure is formed by covering the surface of the conductor with Nomex insulating paper. It is a high-end product with stable high electrical strength and excellent mechanical properties (high strength, high tear resistance, high wear resistance, high toughness), thermal stability (temperature resistance level 220 degrees), chemical compatibility (very acid and alkali resistance, easy to be compatible with varnishes, adhesives, transformer oil, lubricants and refrigerants, and will not be affected by insects, fungi and molds destruction), moisture resistance (when the relative humidity is 95%, the electrical strength is 90% of that when it is completely dry, and the mechanical properties are improved), radiation resistance, non-toxic and flame-resistant (non-toxic to humans and animals, non-melting in the air, not combustion-supporting).
It is an all-weather product, widely used in generators, transformers, electrical equipment, electromechanical and household appliances, especially in the field of high-frequency transformers, open transformers and phase-shifting transformers and other special transformers with obvious performance advantages.
Aramid paper covered wire (copper, aluminum)
Its insulating structure is formed by wrapping aramid insulating paper on the surface of the conductor. It can replace Nomex paper-covered wire in a wide range of fields.
The comparison of paper covered copper wires and paper-wrapped aluminum wires
The significant difference between paper covered copper conductors and Paper Covered Aluminum Conductors is that the wire core is not used. From the name, we can also see that the inside of the paper insulated copper conductor is copper wire.
Compared with the paper-wrapped Aluminium Winding Wire, its resistivity is higher. Under the same circumstances, the resistivity of paper-clad aluminum wire is about 1 times higher than that of paper-clad copper wire.
In addition, in terms of oxidation resistance, the performance of paper-clad copper wire is better than that of paper-clad aluminum wire. It is more stable and will not cause failure due to oxidation.
However, because the aluminum wire is lighter in weight and lower in cost, the overall price of the paper-wrapped aluminum wire is cheaper, and many people still choose it for occasions with low requirements.
Generally speaking, paper-clad copper wire is better in performance, while paper-clad aluminum wire is cheaper in price.
Applications of Chalco paper covered magnet wires
Our company produces a complete range of products, suitable for oil-immersed transformer coils and other similar electrical winding wires, and can meet the requirements of phase-shifting transformers, high-frequency transformers for medical equipment and environmental protection equipment, solar inverters, high-frequency catapults, high-voltage large-capacity thousand-type transformers, motors, reactors, instruments, electric tools and other industries have different needs.
Why choose Chalco paper covered magnet wires?
Authentication
Chalco products are manufactured in our state-of-the-art facility using a strict quality and environmental management system that is ISO certified.
Production strength
The production and management conform to the international power quality system, ensuring the best quality of long service life, high mechanical strength, high electrical conductivity and high temperature resistance softening performance.
Production standard
IEC 60317-27-2-2020
Power customer reference
SIEMENS, ABB, TOSHIBA, LEGRAND, EATON, HITACHI
precautions for purchasing paper covered magnet wires
Material certification
Make sure that the purchased paper-clad aluminum/copper wire materials meet relevant standards and obtain qualified material certification certificates.
Specification requirements
Select the appropriate specification, size and shape according to actual needs to ensure that the purchased Paper Covered Magnet Wires can meet the specific Paper Covered Magnet Wires manufacturing requirements.
Surface quality
Check whether the surface of the purchased Paper Covered Magnet Wires is smooth, free of cracks, wear, oxidation or other surface defects, to ensure that the surface quality of the Paper Covered Magnet Wires meets the requirements.
Supplier reputation
Choose a reputable and experienced supplier to purchase to ensure that the purchased Paper Covered Magnet Wires is reliable in quality, reasonable in price and timely in delivery.
Storage requirements
Pay attention to the storage requirements of the Paper Covered Magnet Wires, keep it dry, avoid moisture, mechanical impact or other damage.
In short, when purchasing Paper Covered Magnet Wires, you need to pay attention to material certification, specification requirements, surface quality, supplier reputation and storage requirements, etc., to ensure that the purchased Paper Covered Magnet Wires are reliable in quality and meet the requirements.