Overview
IEC 60674-3-2:2019 is an international standard published by the International Electrotechnical Commission (IEC) that outlines precise specifications for balanced biaxially oriented polyethylene terephthalate (PET) films intended for electrical insulation applications. As part of the broader IEC 60674 series on plastic films for electrical purposes, this document focuses on the requirements for individual PET film materials to ensure reliability, safety, and performance in electrical systems.
Balanced biaxially oriented PET films offer exceptional mechanical strength, dimensional stability, and electrical insulating properties, making them essential components in electrical insulation systems. This standard ensures uniformity and quality control in manufacturing and application of PET films under electrical stress conditions.
Key Topics
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Types and Classification
- Type 1: Standard PET films for general electrical applications.
- Type 2: Ultra-thin films designed for high electric strength, typically used as dielectric layers in capacitors.
- Type 3: PET films with enhanced high temperature resistance, ideal for electrical winding insulation.
- Type 4 and Type 5: Films with elevated temperature and hydrolysis resistance, suitable for electrical winding insulation and back sheets of photovoltaic modules.
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Material and Manufacturing Requirements
- Films must be biaxially oriented and balanced in orientation to assure mechanical and electrical properties.
- Compositions can include additives, pigments, or dyes, provided they do not compromise the electrical performance.
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Dimensional Specifications
- Thickness, width, roll diameter, and film length are defined to maintain consistency in application and handling.
- Thickness ranges are expanded to accommodate various application needs.
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Physical and Electrical Properties
- Mechanical strength, elongation, tensile strength, and dimensional stability must meet stringent thresholds.
- Electric strength requirements include both AC and DC tests to ensure insulation capability under operational conditions.
- Temperature endurance and resistance to hydrolysis to ensure long-term reliability in harsh environments.
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Testing and Quality Control
- Windability, presence of joins, and roll characteristics are controlled to facilitate effective manufacturing and installation.
- Users must follow safe operating procedures when applying the test methods referenced in the standard.
Applications
IEC 60674-3-2:2019 PET films serve critical roles in a variety of electrical and electronic applications, including:
- Electrical Insulation: Providing reliable insulation for electrical windings in motors, transformers, and generators.
- Capacitors: Ultra-thin Type 2 PET films function effectively as dielectric layers due to their high electric strength.
- Photovoltaic Modules: Types 4 and 5 films are used as back sheets with enhanced resistance to temperature and hydrolysis, contributing to photovoltaic panel durability.
- General Electrical Equipment: Standard Type 1 PET films are suitable for general-purpose electrical insulation in various devices.
The standard enables manufacturers and users to select the appropriate PET film type that meets their operational environment and reliability requirements, assuring compliance with international quality and safety norms.
Related Standards
- IEC 60674-1: Defines terms and general requirements common to plastic films for electrical purposes.
- IEC 60674-2: Describes methods of test for plastic films used in electrical applications.
- IEC 60757: Addresses color designations for plastics, relevant for identifying the film’s color per IEC 60674-3-2.
- IEC 60068-2-67: Environmental testing methods, including damp heat tests applied to evaluate film durability under external conditions.
Summary
The IEC 60674-3-2:2019 specification plays a vital role in the standardization of plastic films for electrical purposes, specifically focusing on the requirements for balanced biaxially oriented PET films. It supports the manufacturing of films that meet rigorous electrical, thermal, and mechanical properties ensuring safety, performance, and longevity in insulation applications. Stakeholders involved in electrical insulation materials, capacitor manufacturing, and solar panel component production will find this standard essential for compliance and quality assurance.
Keywords: plastic films for electrical purposes, balanced biaxially oriented polyethylene terephthalate (PET) films, electrical insulation, IEC standards, PET film specifications, electrical winding insulation, capacitor dielectrics, photovoltaic back sheets.
Open preview (PDF)Specification for plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 2: Requirements for balanced biaxially oriented polyethylene terephthalate (PET) films used for electrical insulation
