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C37.081a-1997  -  Supplement to IEEE Guide for Synthetic Fault Testing of AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis. 8.3.2: Recovery Voltage for Terminal Faults; Asymmetrical Short-Circuit Current

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The transient recovery voltage needs to be modified when interrupting asymmetrical currents. The voltage rate R, the peak voltage E 2 and the rate of change of current di/dt all change with the asymmetrical current zero. Guidance is provided on how to make these corrections when compared to the symmetrical case.