NBN EN 61136-1 : 1995

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
    3.5 Rated current 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
ZA Normative references to international publications with
    their corresponding European publications

Gives alternative procedures for specification of ratings for semi-conductor power convertors for adjustable speed electric drive systems, especially for d.c. motor drives. Established for, but not limited to, convertors of line- or machine-commutated type, and is not meant to cover adjustable speed drives for traction applications.