IEC 60404-16:2018

Overview

IEC 60404-16:2018 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies the methods for measuring the magnetic properties of iron (Fe)-based amorphous strips using a single sheet tester (SST). This standard focuses on AC magnetic property measurements for Fe-based amorphous strips at frequencies up to 400 Hz. These materials, characterized by their rapid solidification and unique magnetic features, are primarily used in transformer cores to achieve energy efficiency improvements.

The standard details the general principles, technical requirements, and the measurement procedure, including apparatus configuration, test specimen preparation, and data acquisition techniques. It incorporates a corrigendum issued in November 2018 to ensure up-to-date compliance and accuracy.

Key Topics

• Scope and Application:
  IEC 60404-16:2018 specifically applies to Fe-based amorphous magnetic strips as defined in IEC 60404-8-11. The standard is tailored to measure AC magnetic properties, such as magnetic polarization, field strength, specific total loss, and apparent power, typically up to 400 Hz.

• Measurement Principles:
  The standard defines the single sheet tester method and emphasizes the wattmeter method using the H coil technique for magnetic field determination. This approach overcomes limitations of traditional magnetizing current methods, important due to the sensitive, thin nature of Fe-based amorphous materials.

• Test Apparatus Design:
  Detailed requirements for test apparatus components include the yoke design, windings, air flux compensation, and magnetic shielding. Special consideration is given to the single-yoke concept to minimize magneto-elastic stress effects on measurements.

• Digital Sampling and Data Processing:
  IEC 60404-16 integrates digital sampling techniques for precise data acquisition and numerical air flux compensation, enabling accurate characterization of magnetic properties.

• Measurement Procedure and Characterization:
  The standard provides step-by-step guidance on specimen preparation, power supply adjustment, and measurement execution. It also covers calculation methods for key magnetic characteristics such as magnetic polarization, magnetic field strength, specific total loss, and apparent power.

• Reproducibility and Validation:
  Guidelines for ensuring reproducibility of results through correct device setup and stability checks of measurement components are included to enhance reliability.

Applications

IEC 60404-16:2018 is essential for manufacturers, researchers, and quality assurance professionals working with Fe-based amorphous strips in various industrial and technological domains, including:

• Transformer Manufacturing:
  Enables precise grading and quality control of amorphous strip material used in the cores of power transformers, helping reduce energy loss and improve efficiency.

• Magnetic Materials Research:
  Supports scientific studies on magnetic properties and behavior of Fe-based amorphous materials under AC excitation, contributing to innovation in magnetic alloys.

• Energy Efficiency Initiatives:
  Facilitates evaluation of materials designed to lower hysteresis and eddy current losses, directly supporting environmental goals by reducing energy consumption and greenhouse gas emissions.

• Standardized Testing Labs:
  Provides accredited laboratories with a validated, internationally recognized method for testing and certifying magnetic properties of Fe-based amorphous strips.

Related Standards

For comprehensive understanding and application, IEC 60404-16:2018 should be considered in conjunction with other parts of the IEC 60404 series on magnetic materials:

• IEC 60404-3:
  Defines measurement methods for electrical steel sheets, highlighting differences in methodology compared to amorphous strips.

• IEC 60404-8-11:
  Specifies the physical characteristics and classification of Fe-based amorphous strips, directly linked to the material scope of IEC 60404-16.

• IEC Technical Specifications and Reports:
  Provide additional background on measurement methods, apparatus calibration, and use of digital sampling techniques applicable to magnetic material testing.

Keywords: IEC 60404-16, Fe-based amorphous strip, magnetic properties measurement, single sheet tester, AC magnetic properties, energy loss reduction, transformer core materials, magnetic characterization, wattmeter method, H coil technique, magneto-elastic sensitivity, digital sampling, international standard.