1 Scope
2 Normative references
3 Definitions
      3.1 Functions of converters
      3.2 Types of converters
      3.3 Converter circuit components
      3.4 Important properties of converters and
             electronic valve devices
      3.5 Disturbances and electromagnetic compatibility
      3.6 Characteristics related to input and output
      3.7 Definitions of rated values
      3.8 Definitions related to cooling
      3.9 Definitions related to temperature
      3.10 Definitions related to tests
4 Additional subscripts and letter symbols
5 Service conditions
      5.1 Code of identification for cooling methods
      5.2 Environmental conditions
             5.2.1 Ambient air circulation
             5.2.2 Normal service conditions
             5.2.3 Unusual environmental service
                      conditions and design considerations
      5.3 Electrical service conditions
             5.3.1 Electrical environment specification
             5.3.2 Unknown site conditions
      5.4 Character of the load
      5.5 Immunity requirements
             5.5.1 AC supply
             5.5.2 DC supply
             5.5.3 Load conditions, load unbalance
             5.5.4 Electrical unusual service conditions
                      and performance requirements
6 Rated values and additional characteristics
      6.1 General
      6.2 Rated values to be specified by the supplier
             6.2.1 Rated input values
             6.2.2 Rated output values
      6.3 Additional characteristics
      6.4 Marking
7 Tests
      7.1 General
             7.1.1 Classification of tests
             7.1.2 Performance of tests
      7.2 Test schedule for converter equipment and
             converter assemblies
      7.3 Test specifications
             7.3.1 Visual inspection
             7.3.2 Checking of auxiliary devices
             7.3.3 Insulation test
             7.3.4 Checking of the protective devices
             7.3.5 Light load and functional test
             7.3.6 Rated output test
             7.3.7 Overcurrent test
             7.3.8 Temperature-rise test
             7.3.9 Power loss determination
             7.3.10 Measurement of total harmonic
                      distortion (THD) or total harmonic
                      factor (THF)
             7.3.11 Measurement of power factor
             7.3.12 Measurement of output voltage
             7.3.13 Confirmation of output voltage
                      adjustable range
             7.3.14 Output voltage unbalance test
             7.3.15 Confirmation of output frequency
                      adjustable range
             7.3.16 Output frequency tolerance band test
             7.3.17 Checking of the automatic control
             7.3.18 Short-circuit test
             7.3.19 Measurement of audible noise
             7.3.20 Immunity test
             7.3.21 Emission test
             7.3.22 Measurement of ripple voltage and
                      current
             7.3.23 Additional tests
      7.4 Tolerances
Annex A (informative) Example for testing high power
                      converters
      A.1 - Introduction
      A.2 - Basic concepts
      A.3 - Test procedures
            A.3.1 - Rated output test
            A.3.2 - Overcurrent test
            A.3.3 - Temperature-rise test
                    A.3.3.1 - GTO and diode
                    A.3.3.2 - Snubber circuits
                    A.3.3.3 - DC capacitors
            A.3.4 - Power loss determination
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publication
Figure 1 - Maximum expected overvoltage versus duration of
           transient
Figure 2 - Diagram for calculation of voltage unbalance
           factor
Figure A.1 - Example of a larger converter
Figure A.2 - Test circuit of a converter assembly
Figure A.3 - Timing chart for GTO gate pulses
Table 1 - Immunity levels for stiff a.c. voltage connections
Table 2 - DC voltage tolerances
Table 3 - Relative peak-to-peak ripple factor
Table 4 - Test items
Table 5 - Tolerances of losses and efficiency