IEC 60317-68:2017

Overview

IEC 60317-68:2017 (with amendments 2019 and 2024) is an international standard developed by the International Electrotechnical Commission (IEC) that defines the requirements for polyvinyl acetal enamelled rectangular aluminium winding wire, class 120. This standard applies to aluminium conductors with a sole insulation coating of polyvinyl acetal or polyvinyl formal resin, including certain modifications as long as the base chemical identity and performance requirements are preserved. IEC 60317-68 is part of the broader IEC 60317 series, which covers specifications for various types of winding wires used in electrical equipment.

The scope of IEC 60317-68:2017 focuses on rectangular aluminium wires with the following nominal dimensions:

• Width: 2.0 mm to 16.0 mm
• Thickness: 0.80 mm to 5.60 mm

Both grade 1 and grade 2 wires are covered for the complete range of conductor sizes. The exact combinations of width and thickness, as well as width-to-thickness ratios, are detailed in IEC 60317-0-9.

Key Topics

IEC 60317-68:2017 outlines several essential areas concerning polyvinyl acetal enamelled aluminium winding wire:

• Material and Construction: Specifies requirements for wire coating based on polyvinyl acetal resins.
• Applications: Enamelled wire suitable for electrical windings where rectangular conductor profiles are needed.
• Thermal and Electrical Properties:
  • Class 120: Requires a minimum temperature index of 120°C and heat shock resistance of at least 155°C.
  • Electrical Resistance: Requirements refer to core standard IEC 60317-0-9.
• Mechanical Properties:
  • Flexibility and Adherence: Tested via mandrel winding and adherence tests.
  • Elongation: Referenced to ensure mechanical robustness and coil performance.
• Chemical Properties:
  • Solvent Resistance and Transformer Oil Resistance: Ensures coating durability in demanding operational environments.
• Testing and Quality Requirements: Methods and acceptance criteria reference IEC 60317-0-9 and IEC 60851-4 for test procedures.

Applications

IEC 60317-68-compliant wires are essential in sectors requiring reliable and high-performance insulated aluminium winding wires, including:

• Transformers: For windings where space and efficiency are critical and rectangular wire shapes facilitate higher packing density.
• Motors and Generators: Used for stator and rotor windings in various industrial and consumer electric machines.
• Electrical Coils and Inductors: Employed in devices needing precise winding geometry for performance and heat management.
• Power Electronics: Suitable for use in chokes, reactors, and other assemblies where thermal stability and insulation integrity are necessary.

By adhering to IEC 60317-68, manufacturers and users can ensure that aluminium winding wires meet international standards for quality, performance, and compatibility, supporting global interoperability and safety in electrical equipment.

Related Standards

To fully implement IEC 60317-68:2017, it is important to consider related international standards that govern winding wires and associated components:

• IEC 60317-0-9: General requirements for enamelled rectangular aluminium wire.
• IEC 60851 (all parts): Series specifying test methods for winding wires, including chemical, electrical, and mechanical properties.
• IEC 60264 (all parts): Packaging standards for winding wires, ensuring safe handling, transport, and storage.

By leveraging these interconnected standards, professionals in electrical engineering, production, and quality assurance can ensure consistent, high-quality results in the design and manufacture of coils, transformers, and other critical applications using rectangular aluminium winding wire.

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