PD IEC/TR 62271-308:2002

FOREWORD
1 General
   1.1 Scope
   1.2 Reference documents
2 Definitions
3 Ratings
4 Test procedure
   4.1 Demonstration of arcing times during three-phase
       tests for test-duty T100a
   4.2 Demonstration of arcing times during single-phase
       tests in substitution of three-phase conditions
       in a non-solidly earthed neutral system (first
       pole-to-clear factor 1,5) for test-duty T100a
   4.3 Demonstration of arcing times during single-phase
       tests in substitution of three-phase conditions in
       a solidly earthed neutral system (first
       pole-to-clear factor 1,3) for test-duty T100a
   4.4 DC component of short-circuit breaking current
   4.5 Test-duty T100a
5 Asymmetry criteria
   5.1 Direct tests
   5.2 Synthetic tests
   5.3 Adjustment measures
Annex A Calculation of the TRV parameters during
        asymmetrical fault condition (T100a)
Annex B Table B.1 - Tolerances on test quantities for
        type tests
Annex C Alternative to C.2.5 of IEC 62271-100
Annex D Examples for the application of the asymmetry
        criteria during asymmetrical test duty
Annex E Updated information regarding item g) of 1.2.1
        of IEC 62271-100
Figures and Tables

Gives information and test procedures for type testing of circuit-breakers relevant to short-circuit breaking performance during asymmetrical test duty. Also covers all possible testing cases, i.e. single-phase, three-phase, direct tests, synthetic tests, first pole-to-clear factors 1,3 and 1,5.

This technical report contains information and test procedures for type testing of circuit-breakers relevant to short-circuit breaking performance during asymmetrical test duty (T100a) as required by IEC 62271-100. This technical report covers all possible testing cases, i.e. single-phase, three-phase, direct tests, synthetic tests, first pole-to-clear factors 1,3 and 1,5.