IEC 60317-27-2:2020

Overview

IEC 60317-27-2:2020 specifies requirements for paper tape covered round aluminium winding wire. The standard covers round aluminium conductors wrapped with two or more layers of paper tape and is primarily intended for winding coils for oil‑immersed transformers. Nominal conductor diameters covered range from 0.500 mm up to and including 5.000 mm. Paper tape materials are limited to those defined in IEC 60554‑1 and IEC 60554‑3‑5.

This part of the IEC 60317 series is intended to be used together with the general aluminium winding wire requirements in IEC 60317‑0‑3 and the IEC winding wire test methods (IEC 60851 series).

Key topics and technical requirements

• Conductor range: Nominal diameters 0.500 mm to 5.000 mm (see IEC 60317‑0‑3 for dimensioning rules).
• Paper covering: Two or more layers of paper tape wrapped firmly, evenly and continuously; adhesive only permitted to anchor tape ends. Paper types restricted to IEC 60554 parts.
• Increase in diameter due to covering: The nominal increase (and associated tolerances) resulting from the paper tape covering shall be agreed between purchaser and supplier; maximum overall diameter limits are defined relative to the bare conductor dimensions. Example marking format: IEC 60317‑27‑2 3,200 + 0,30.
• Electrical and mechanical verification: Electrical resistance and elongation requirements are referenced to IEC 60317‑0‑3; many other tests are referenced to the IEC 60851 series. Several tests (e.g., heat shock, cut‑through, abrasion, breakdown voltage) are noted as inappropriate for this type of covering and are therefore excluded or to be agreed case‑by‑case.
• Appearance and cleanliness: Conductors should be essentially free from aluminium dust and extraneous matter on the original spool; paper covering must be tightly and uniformly applied.
• Packaging: Packaging requirements are included to ensure safe transport and storage of finished winding wire.

Applications and users

This standard is directly relevant to:

• Transformer manufacturers (especially oil‑immersed transformers)
• Winding wire producers and suppliers
• Electrical design and winding engineers
• Quality assurance and procurement teams specifying winding wire for coils and transformers

Using IEC 60317‑27‑2 ensures consistent mechanical and dimensional properties for paper‑covered aluminium winding wires, simplifying design, procurement and interchangeability.

Related standards

• IEC 60317‑0‑3 (general requirements for enamelled round aluminium wire)
• IEC 60554‑1 and IEC 60554‑3‑5 (cellulosic papers for electrical purposes)
• IEC 60851 series (winding wire test methods)

Keywords: IEC 60317‑27‑2, paper tape covered round aluminium wire, winding wires, oil‑immersed transformers, conductor diameters, IEC 60317‑0‑3, IEC 60554, winding wire specifications.