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BS EN IEC 60404-12:2023

BS EN IEC 60404-12:2023

$102.76

Magnetic materials – Methods of test for the assessment of the thermal endurance of surface insulation coatings on electrical steel strip and sheet

Published By Publication Date Number of Pages
BSI 2023 20
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IEC 60404-12:2023 is applicable to surface insulation coatings on electrical steel strip and sheet classified in IEC 60404-1-1. This document defines the general principles and technical details of the tests for the assessment of the thermal endurance of surface insulation coatings on electrical steel strip and sheet. The assessment is made by evaluating the change of a specified property of the surface insulation coating due to a heat treatment at a specified temperature up to 850 °C for a specified duration time up to 2 500 h. The specified property is measured at an ambient temperature of (23 ± 5) °C both without heat treatment and after heat treatment. This edition includes the following significant technical changes with respect to the previous edition:

  1. the method of test for adhesion has been modified to match to the method of bend test specified in ISO 1519 using a cylindrical mandrel of 32 mm in diameter instead of the 30 mm diameter mandrel specified in the first edition;
  2. the method of test for interlaminar insulation resistance has been modified to match to the method specified in IEC 60404-11 and the modified Franklin test has been removed;
  3. the method of test for compressibility has been modified to match to the method of test for stacking factor specified in IEC 60404-13;
  4. the concept of “resistance grades” has been removed;
  5. the clamping pressure to be used at temperature ratings above 500 °C has been reduced to (0,01 ± 0,001) N/mm2;
  6. the testing for continuous exposure has been made a subject to an agreement between the manufacturer and the purchaser and the procedure has been moved to an informative Annex A.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
6 Blank Page
7 English
CONTENTS
8 FOREWORD
10 INTRODUCTION
11 1 Scope
2 Normative references
12 3 Terms and definitions
4 General principles
4.1 General
4.2 Preparation of clamped stacks of test specimens
4.2.1 Procedure of stacking test specimens
4.2.2 Clamping stacks for temperature ratings up to 500 °C
13 4.2.3 Clamping stacks for temperature ratings above 500 °C
4.3 Heat treatment
4.3.1 For time ratings up to 2 500 h
Figure 1 – Example of clamped stack for 100 mm square test specimens
14 4.3.2 For continuous exposure
5 Standard temperature/time performance designations T/t
6 Method of the test for adhesion
6.1 General
6.2 Test specimens
6.3 Procedure of test
15 6.4 Test report
7 Method of the test for surface insulation resistance
7.1 General
7.2 Test specimens
7.3 Procedure of test
16 7.4 Test report
8 Method of the test for stacking factor
8.1 General
8.2 Test specimen
8.3 Procedure of test
8.4 Test report
17 Annex A (informative)Method of test for the assessment of the thermal endurancefor continuous exposure to elevated temperatures
A.1 General
A.2 Procedure of test
A.3 Temperature/time performance designations T/t for continuous exposure
18 Bibliography

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BS EN IEC 60404-12:2023
$102.76