BS EN 60404-2:1998+A1:2008:2018 Edition
$142.49
Magnetic materials – Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of an Epstein frame
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 30 |
This part of IEC 60404 is applicable to grain oriented and non-oriented electrical sheet and strip for a.c. measurements of magnetic properties at frequencies up to 400 Hz and for d.c. magnetic measurements.
The object of this part is to define the general principles and the technical details of the measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame.
The Epstein frame is applicable to test specimens obtained from electrical steel sheets and strips of any grade. The a.c. magnetic characteristics are determined for sinusoidal induced voltages, for specified peak values of magnetic polarization and for a specified frequency.
The measurements are to be made at an ambient temperature of (23 ± 5) °C on test specimens which have first been demagnetized.
Measurements at higher frequencies are to be made in accordance with IEC 60404‑10.
NOTE Throughout this standard the term “magnetic polarization” is used as defined in IEC 60050(221). In some standards of the IEC 60404 series, the term “magnetic flux density” was used.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 7 | English CONTENTS |
| 10 | 1 Scope and object 2 Normative references |
| 11 | 3 General principles of a.c. measurements 3.1 Principle of the 25 cm Epstein frame method 3.2 Test specimen 3.3 The 25 cm Epstein frame |
| 13 | 3.4 Air flux compensation 3.5 Power supply 3.6 Voltage measurement |
| 14 | 3.7 Frequency measurement 3.8 Power measurement 4 Procedure for the measurement of the specific total loss 4.1 Preparation for measurement 4.2 Adjustment of power supply |
| 15 | 4.3 Measurement of power 4.4 Determination of the specific total loss |
| 16 | 4.5 Reproducibility of the specific total loss measurement 5 Procedure for the determination of the peak value of magnetic polarization, r.m.s. value of magnetic field strength, peak value of magnetic field strength and specific apparent power 5.1 Test specimen 5.2 Principle of measurement |
| 18 | 5.3 Reproducibility 6 General principles of d.c. measurements 6.1 Principle of the 25 cm Epstein frame method 6.2 Test specimen 6.3 The 25 cm Epstein frame |
| 19 | 6.4 Air flux compensation 6.5 Power supply 6.6 Apparatus accuracy 7 Procedure for the d.c. measurement of the magnetic polarization 7.1 Preparation for measurement 7.2 Determination of the magnetic polarization |
| 20 | 7.3 Determination of the magnetic hysteresis loop 7.4 Reproducibility of the measurement of the magnetic polarization 8 Test report |
| 21 | Figures Figure 1 – Double-lapped joints Figure 2 – The 25 cm Epstein frame |
| 22 | Figure 3 – Circuit for the wattmeter method Figure 4 – Circuit for measuring the r.m.s. value of the magnetizing current |
| 23 | Figure 5 – Circuit for measuring the peak value of the magnetic field strength using a peak voltmeter Figure 6 – Circuit for measuring the peak value of magnetic field strength using a mutual inductor MD |
| 24 | Figure 7 – Circuit for d.c. testing: to obtain discrete values of magnetic polarization Figure 8 – Circuit for d.c. testing: continuous recording method |
| 25 | Annex A (informative) Digital sampling methods for the determination of the magnetic properties |
| 28 | Bibliography |
