1.1 Scope and object
1.2 Normative references
1.3 Classification of semiconductor power equipment
        and valves
1.3.1 Classification of semiconductor power equipment
1.3.2 Classification of semiconductor valves
1.4 List of principal letter symbols and subscripts
1.4.1 List of subscripts
1.4.2 List of symbols (self evident symbols are not
        listed)
1.5 Definitions
1.5.1 Semiconductor device (IEV 551-03-05, modified)
1.5.2 Power semiconductor diode
1.5.3 Thyristor
1.5.4 Reverse blocking triode thyristor
1.5.5 Reverse conducting triode thyristor
1.5.6 Bidirectional triode thyristor (triac)
1.5.7 Turn-off thyristor (GTO = Gate Turn Off)
1.5.8 Combination of semiconductor devices
1.5.9 Convertor circuit elements
1.5.10 Convertor connection (IEV 551-04-17)
1.5.11 Controllability of convertor arms
1.5.12 Quadrants of operation (on d.c. side)
1.5.13 Commutation and quenching (see figure 1)
1.5.14 Type of commutation
1.5.15 Self commutation (IEV 551-05-06)
1.5.16 Type of quenching
1.5.17 Commutation circuit (IEV 551-05-09)
1.5.18 Trigger delay angle alpha (IEV 551-05-29,
        modified)
1.5.19 Trigger advance angle beta
1.5.20 Inherent delay angle alpha p
1.5.21 Extinction angle gamma (IEV 551-05-30, modified)
1.5.22 Definitions of rated values
1.5.23 Definitions of rated values for assemblies and
        equipment
1.5.24 Efficiency definitions
1.5.25 Terms used in connection with d.c. voltage
1.5.26 Factors on the a.c. side
1.5.27 Terms used in connection with d.c. voltage
1.5.28 Terms used in connection with direct voltage
        regulation
1.5.29 Definitions related to cooling
1.5.30 Temperature definitions
1.5.31 Electrical disturbances
1.5.32 Level of immunity of a convertor
1.5.33 Level of generated disturbance of a convertor
1.5.34 Reference level of generated disturbance of a
        convertor
1.5.35 Relative short-circuit power, RSC
1.5.36 Compatibility of a system
1.5.37 Types and characteristics of common disturbances
1.5.38 Harmonic distortion (IEV 551-06-07)
Section 2 - Service conditions
2.1 Code of identification for cooling method
2.1.1 Letter symbols to be used
2.1.2 Arrangement of letter symbols
2.2 Environmental conditions
2.2.1 Ambient air circulation
2.2.2 Normal service conditions
2.2.3 Unusual service conditions
2.3 Electrical service conditions
2.3.1 Electrical environment specification
2.3.2 Unknown site conditions
2.4 Character of the load
2.5 Electrical service conditions as a basis of
        ratings
2.5.1 Frequency
2.5.2 A.C. voltage
2.5.3 Voltage unbalance
2.5.4 A.C. voltage wave form
Section 3 - Convertor equipment and assemblies
3.1 Electrical connection and calculation factors
3.1.1 Standard design convertors
3.1.2 Special design convertors
3.2 Calculation factors
3.2.1 Voltage ratio
3.2.2 Line side current factor
3.2.3 Voltage regulation
3.2.4 Magnetic circuit
3.2.5 Power loss factor
3.3 Losses and efficiency
3.3.1 General
3.3.2 Included losses
3.3.3 Not included losses
3.4 Power factor
3.4.1 General
3.4.2 Power, reactive power, apparent power and
        displacement factor
3.5 Voltage regulation
3.5.1 Inherent direct voltage regulation
3.5.2 Influence of other convertors
3.5.3 Twelve pulse convertors
3.5.4 Boost and buck connection convertors (series
        connection)
3.6 Harmonics in line currents and voltages
3.6.1 Order of harmonics
3.6.2 Amplification of harmonic currents
3.7 Direct voltage harmonic content
3.8 A.C. current in the direct current output
3.9 Interference
3.9.1 Interference with in-plant low current control
        and communication lines
3.9.2 Interference with telephone and communication
        lines
3.10 Rated values for convertors
3.10.1 General
3.10.2 Rated output voltage
3.10.3 Rated current values
3.10.4 Particular remarks for double convertors
3.11 Markings
3.11.1 Clear indication of manufacturer or supplier
3.11.2 Indication of the type of equipment
3.11.3 Marking of the input and output terminals of the
        main circuit
3.11.4 Rating plate
Section 4 - Tests for valve device assemblies and
            convertor equipment
4.1 General
4.1.1 Type tests
4.1.2 Routine tests
4.1.3 Performance of tests
4.1.4 Test schedule
4.2 Test specifications
4.2.1 Insulation tests
4.2.2 Light load and functional test
4.2.3 Rated current test
4.2.4 Power loss determination for assemblies and
        equipment
4.2.5 Temperature rise test
4.2.6 Power factor measurements
4.2.7 Checking of auxiliary devices
4.2.8 Measurement of the inherent voltage regulation
4.2.9 Checking the properties of the control
        equipment
4.2.10 Checking the protective devices
4.2.11 Immunity test
4.2.12 Overcurrent capability test
4.2.13 Radio frequency generated interference and
        conducted noise
4.2.14 Audible noise
4.2.15 Measurement of ripple voltage and current
4.2.16 Additional tests
4.3 Tolerances
Annexes
A (informative) Index of definitions
B (informative) Bibliography
ZA (normative) Other international publications
        quoted in this standard with the reference of
        the relevant European publications
Figures
1 Types of commutation
2 Illustration of angles
3 Voltage regulation
4 A.C. voltage waveforms
Tables
1 Connections and calculation factors
2 Standard duty classes
3 Examples of load cycles
4 Summary of tests
5 Test voltages, low voltage
6 Test voltages, medium voltages