IEC 61136-1:1992

FOREWORD
Clause
1 General
   1.1 Scope and object
   1.2 Normative references
2 Definitions
3 Rated values
   3.1 General
   3.2 Rated direct voltage
   3.3 Rated temperature values
   3.4 System of establishing rated current-time values
        for semiconductor assemblies and equipments
   3.5 Rated currents for equipments and sections
   3.6 Overload and surge current capability
   3.7 D.C. power rating (convertor equipment)
   3.8 Service conditions
4 Duty classes for non-repetitive load duty
5 Tests for thyristor assemblies
Annexes
A Calculation method for equivalent repetitive load
   duty curves shown in figure 10
B Basis for the equivalent repetitive load duty method

Provides alternative methods for specifying ratings for semiconductor power convertors for adjustable speed electric drive systems, particularly for d.c. motor drives. It has been established with respect to, but is not restricted to, convertors of line or machine-commutated type. It is not intended to cover adjustable speed drives for traction purposes.