Overview
IEC 60641-3-2:2007 specifies the requirements for presspaper materials used for electrical insulation purposes. Part of the IEC 60641 series, this international standard is published by the International Electrotechnical Commission (IEC) and applies specifically to presspaper constructed from 100% sulphate wood pulp, 100% cotton, or a blended mixture of these materials. The standard details the requirements for presspaper types P.2.1, P.4.1, P.4.2, P.4.3, and P.6.1, which are commonly utilized in various electrical applications due to their reliable insulation properties.
This edition includes key updates from the previous version, such as a revised type P.6 (designation unchanged), removal of type P.7, simplified property-thickness relationships, and updated values to better serve modern industrial needs.
Key Topics
- Material Composition: Covers presspaper made from 100% sulphate wood pulp, 100% cotton, or a mix of both. Each type is tailored for specific electrical insulation applications.
- Type Designations: Provides classification of presspaper types according to their composition, density, absorption, porosity, and purity.
- P.2.1: High-density, high-purity sulphate wood pulp presspaper
- P.4.1: High-purity, high oil absorption sulphate wood pulp presspaper
- P.4.2: 100% cotton presspaper
- P.4.3: Mixture of sulphate wood pulp and cotton
- P.6.1: Low-porosity, high-density presspaper for dry-type applications
- Technical Requirements: Establishes requirements related to tensile strength, elongation, shrinkage, plybond resistance, moisture content, ash content, conductivity, pH, oil absorption, and electric strength in both air and oil.
- Performance Adjustments: Requirements and thresholds have been updated to reflect current user needs and technological advancements.
Applications
IEC 60641-3-2:2007 is essential for manufacturers, suppliers, and users of electrical insulation materials in a wide range of industrial sectors:
- Power Transformers: Utilized for insulation layers within oil-filled and dry-type transformers, ensuring electrical safety and longevity.
- Rotating Electrical Machines: Ensures robust insulation in generators and motors, protecting windings and core assemblies.
- Switchgear & Control Gear: Provides reliable dielectric barriers, crucial for safe operation and protection against electrical faults.
- High Voltage Equipment: Applied as interlayer and wrapping insulation for windings and conductors in high-voltage assemblies.
- General Electrical Insulation: Suitable for use in bushings, capacitors, and other components requiring dependable electrical separation and mechanical strength.
The standardized requirements help guarantee consistent performance, enabling compatibility and quality across global supply chains. By adhering to this standard, stakeholders ensure safety, efficiency, and interoperability in electrical insulation systems.
Related Standards
- IEC 60641-1: Pressboard and presspaper for electrical purposes - Definitions and general requirements
- IEC 60641-2: Pressboard and presspaper for electrical purposes - Methods of test
- IEC 60641-3-1: Specifications for pressboard for electrical purposes
- IEC 60554-3: Specification for cellulosic papers for electrical purposes
- IEC 60243 Series: Electric strength of insulating materials
For more information and access to the complete standard, visit the official IEC webstore.
Keywords: IEC 60641-3-2, electrical insulation, presspaper, sulphate wood pulp, cotton presspaper, electrical purposes, insulating material standard, high voltage insulation, transformer insulation, international standards for electrical equipment.
Open preview (PDF)Pressboard and presspaper for electrical purposes - Part 3: Specifications for individual materials - Sheet 2: Requirements for presspaper, types P.2.1, P.4.1, P.4.2, P.4.3 and P.6.1
