Overview
IEC 60317-27-3:2019 (consolidated edition 1.1, 2024) specifies requirements for paper tape covered rectangular copper winding wires. The standard covers rectangular copper conductors wrapped with two or more layers of paper tape and is primarily intended for winding coils used in oil‑immersed transformers. It defines the permitted nominal conductor size range (width 2.0–31.5 mm; thickness 0.80–10.0 mm), limits the paper types to those in IEC 60554‑1 and IEC 60554‑3‑5, and references general requirements and test methods in IEC 60317‑0‑2 and the IEC 60851 series.
Key topics and technical requirements
- Scope and sizing
- Nominal conductor dimensions and tolerances: width and thickness ranges are specified; overall dimensions include increases from paper covering.
- Increase in dimensions due to paper covering and maximum overall dimensions (see Table 1 in the standard).
- Covering construction
- Two or more layers of specified cellulosic paper tapes; no adhesive except end anchors.
- Number of tapes, tape thickness and overlap are agreed between purchaser and supplier.
- Electrical and mechanical tests
- Electrical resistance, elongation, springiness, flexibility and adherence.
- Heat shock, cut‑through, resistance to abrasion, solvents and refrigerants.
- Breakdown voltage, continuity of insulation and dielectric dissipation factor.
- Solderability, heat/solvent bonding, pin hole test and loss of mass.
- Oil compatibility and aging
- Resistance to hydrolysis and to transformer oil; temperature index tests.
- Documentation and marking
- Required description when ordering (reference to IEC 60317‑27‑3, conductor dimensions, nominal increase due to paper, optional proof strength).
- Referenced test standards
Applications and who uses it
- Transformer manufacturers and designers specifying winding materials for oil‑immersed power and distribution transformers.
- Winding wire manufacturers and suppliers producing paper‑tape covered rectangular copper conductors.
- Procurement and quality assurance teams ensuring supplied wire meets mechanical, electrical and oil‑compatibility requirements.
- Test laboratories performing conformity and type tests referenced by IEC 60317‑27‑3.
Related standards (applicable)
Using IEC 60317‑27‑3 helps ensure consistent performance, safety and interchangeability of paper tape covered rectangular copper winding wires in oil‑immersed transformer applications.
Open preview (PDF)Specifications for particular types of winding wires - Part 27-3: Paper tape covered rectangular copper wire
