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IEC/TR 62271-308

High-Voltage Switchgear and Controlgear - Part 308: Guide for Asymmetrical Short-Circuit Breaking Test Duty T100a

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Organization: IEC
Publication Date: 1 August 2002
Status: inactive
Page Count: 98
ICS Code (High voltage switchgear and controlgear): 29.130.10
ICS Code (Other switchgear and controlgear): 29.130.99
scope:

This technical report contains information and test procedures for type testing of circuitbreakers 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.

IEC 62271-100 testing procedures for short-circuit breaking performance during asymmetrical test duty (T100a) are valid only when the d.c. time constant of the test circuit is equal or close to the rated d.c. time constant of the rated short-circuit breaking current.

This technical report can be generally applied, and it gives rules to be followed when the d.c. time constant of the test circuit is equal to, or different from, the rated d.c. time constant of the rated short-circuit breaking current. Tolerances on the test parameters are also given in order to allow that more than one rated d.c. time constant with a single test series be covered. This concept of asymmetry equivalence may also help the user in establishing equivalence between system needs and the rating requirements.

When the d.c. time constant of the test circuit is different from the rated d.c. time constant of the rated short-circuit breaking current, the testing procedures given in IEC 62271-100 cannot be applied directly and the testing procedure given in this technical report should be followed. The procedures given in this guide are also fully valid when the d.c. time constant of the test circuit is equal to the to rated d.c. time constant of the rated short-circuit breaking current.

Document History

IEC/TR 62271-308
August 1, 2002
High-Voltage Switchgear and Controlgear - Part 308: Guide for Asymmetrical Short-Circuit Breaking Test Duty T100a
This technical report contains information and test procedures for type testing of circuitbreakers relevant to short-circuit breaking performance during asymmetrical test duty (T100a) as required by...

References

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