IEC 60740-1 : 1.0

LAMINATIONS FOR TRANSFORMERS AND INDUCTORS - PART 1: MECHANICAL AND ELECTRICAL CHARACTERISTICS

International Electrotechnical Committee

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FOREWORD
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Materials and lamination thicknesses
   4.1 Materials
   4.2 Nominal lamination thickness
   4.3 Minimum stacking factor
5 Designation of laminations and lamination strips
   5.1 Specified complete shapes
   5.2 Lamination strips for specified shapes
   5.3 Lamination strips for non-specified laminations
6 Packing and marking
7 Electrical tests
   7.1 General
   7.2 Core constants
   7.3 Magnetic path length
   7.4 Core cross-section
8 General conditions for electrical measurements
   8.1 Atmospheric conditions
   8.2 Test coils
   8.3 Test cores
   8.4 Harmonic content of the voltage
9 Measurements at high field strength
   9.1 General
   9.2 Measurement of power loss
   9.3 Measurement of total apparent power
10 Measurements at low and medium field strength
   10.1 General
   10.2 Measurement of amplitude permeability
11 Preferred ranges of laminations
12 Dimensions and tolerances
   12.1 Dimensions
   12.2 Tolerances
   12.3 Symmetry tolerances
13 Dimensions and effective parameters
   13.1 General
   13.2 Lamination strips Type YS
   13.3 Laminations Type YEI 1
   13.4 Laminations Type YUI 1
   13.5 Lamination Types YUI 2
   13.6 Lamination Types YEx 2, YEE 2 and YEI 2
   13.7 Lamination Types YEE 2-L
   13.8 Lamination Types YEx 3, YEE 3, YEF 3, YEI 3 and YEL 3
   13.9 Lamination Types YEx 4, YEE 4 and YEF 4
   13.10 Laminations Type YM 1
14 Electrical characteristics for materials
15 Specific total apparent power for laminations
16 Specific power loss for laminations
17 Mechanical characteristics for laminations
   17.1 General appearance and conditions
   17.2 Cut and punch edge
   17.3 Camber
   17.4 Distortion
   17.5 Bending
   17.6 Insulation
   17.7 Welding
Annex A (informative) Conversion of polarisation and field
                      strength into specific total apparent
                      power
   A.1 Specific total apparent power from polarisation and
         field strength
   A.2 Equations for the curves of the magnetic materials
   A.3 Constants for non-oriented silicon steel C 21
   A.4 Specific reactive power and specific power loss for
         non-oriented silicon steel C 21
   A.5 Constants for grain-oriented silicon steel C 22
   A.6 Specific reactive power and specific power loss for
         grain-oriented silicon steel C 22
   A.7 Influence of the shape on the electrical
         characteristics for grain-oriented silicon steel
         C 22
Bibliography