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American National Standards Institute (ANSI)/IEEE medium-voltage circuit breaker ratings have changed in recent years, causing a great deal of confusion over how to properly select a breaker for short circuit duty. This article reviews the basics of an asymmetrical short circuit current waveform. It illustrates the effect of the X/R ratio and how the relationship between the dc component and the circuit-breaker...
ANSI/IEEE Medium-voltage circuit breaker ratings have changed in recent years, causing a great deal of confusion over how to properly select a breaker for short-circuit duty. This paper reviews basics of an asymmetrical short-circuit current waveform. It illustrates the effect of the X/R ratio and how the relationship between the dc component and the circuit breaker contact parting time determines...
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