Using the current injection method, how to calculate the transient recovery voltages in three-phase asymmetrical current interruption in analysis has been devised. This calculation is applicable to both effectively earthed neutral system and non-effectively earthed neutral system. Since the transient recovery voltages of three-phase test duty T100a are calculated, the performance of the circuit breaker in three-phase asymmetrical current interruption can be estimated more correctly in synthetic testing.
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