IEC 60317-72:2017

Overview

IEC 60317-72:2017 is an international standard published by the International Electrotechnical Commission (IEC) that defines the specifications for a specific type of insulated winding wire. This standard details requirements for polyester glass-fibre wound fused, silicone resin or varnish impregnated bare or enamelled round copper wire with a temperature index of 200°C. These wires are specially designed for use in electrical equipment windings where high thermal performance and durability are critical.

The standard ensures these insulated wires meet stringent quality and performance criteria, facilitating consistent manufacturing and safe application across international markets. It is part of a comprehensive series of IEC 60317 standards covering various types of winding wires.

Key Topics

• Material Composition
  The winding wire consists of a round copper conductor wound with a fused polyester glass-fibre covering. This combination provides excellent mechanical strength and thermal resistance. The fibres are made from a blend of electrical-grade continuous-filament glass yarn and high-quality polyester yarn, with polyester content capped at 50% by weight.

• Impregnation and Coating
  The glass-fibre covering is impregnated with a silicone-based resin or varnish, offering enhanced electrical insulation and thermal stability. The impregnating agent must have a minimum temperature index of 200°C, indicating suitability for high-temperature applications.

• Grades of Fibre Thickness
  The coating thickness differentiates into grades based on the number of polyester glass-fibre layers:

  • PG1: Bare conductor with either one layer of polyester glass fibre or two layers of finer yarn, meeting specified dimension requirements.
  • PG2: Bare conductor with two layers of polyester glass fibre.

• Thermal Performance
  The wires maintain a temperature index of 200°C, suitable for advanced electrical equipment requiring high thermal endurance. Notably, the heat shock test is not applicable to these wires, and therefore no heat shock temperature classification can be specified.

• Testing and Quality Assurance
  The standard references test methods as per IEC 60317-0-10 and describes electrical resistance, elongation, flexibility, abrasion resistance, solvent resistance, breakdown voltage, continuity of insulation, solderability, and other critical performance characteristics.

Applications

IEC 60317-72:2017 certified winding wires are primarily utilized in the electrical industry for:

• Electric Motors and Generators
  Ensuring winding insulation integrity under high thermal stress to increase equipment reliability and lifespan.

• Transformers and Inductors
  Providing stable, high-temperature rated insulation to withstand operational and environmental stresses.

• Industrial Electrical Equipment
  Used in coils and electromagnets where enhanced mechanical durability and temperature resistance are essential.

• Specialized Electrical Apparatus
  Suitable for applications requiring bare or enamelled round copper wire with advanced insulation for precise winding and operation.

Related Standards

• IEC 60317 Series
  A complete series of standards specifying particular types of winding wires, ensuring uniformity and interoperability across electrical applications worldwide.

• IEC 60851 Series
  Defines standardized test methods for evaluating the properties and performance of winding wires.

• IEC 60264 Series
  Specifies packaging requirements for winding wires, protecting their quality during transport and storage.

• IEC 60317-0-10:2017
  Provides general requirements for polyester glass-fibre wound fused and impregnated wires, serving as a normative reference for IEC 60317-72.

Practical Value

Compliance with IEC 60317-72:2017 assures manufacturers, designers, and end-users of insulated wires used for windings that the product offers:

• High thermal endurance at a 200°C temperature index.
• Durable mechanical and electrical properties from the polyester glass-fibre wound construction.
• Reliable silicone resin or varnish impregnation that enhances insulation quality.
• Certainty of performance through internationally recognized test methods and specifications.
• Flexibility in application for both bare and enamelled copper winding wires.

Manufacturers can leverage this standard to produce reliable wiring solutions that meet demanding electrical and thermal conditions, while consumers and engineers benefit from enhanced safety, efficiency, and compliance with global regulatory expectations.