Asymmetrical Short Circuit And Symmetrical Short Circuit: Etap Knowledge Base

ETAP Knowledge Base

Asymmetrical Short Circuit and Symmetrical Short Circuit Description: ANSI Max Short-circuit calculation only provides symmetrical fault values Category:

Short Circuit - ANSI

Type:

Simulation

Keywords:

Short Circuit, Asymmetrical, Symmetrical, ANSI 3 phase device duty

Q: Why does the Max short circuit calculation does not report the asymmetrical fault current values?

A: The Max Short Circuit Analysis has not been designed to report the asymmetrical values. This is the job of the ANSI SC Device Duty calculation. Typically the Max short-circuit calculation is designed mostly for unbalanced faults. The asymmetrical fault currents are considered to be worse case under the three-phase bolted fault conditions (device duty condition) In the future ETAP may consider adding the asymmetrical fault current values to the Max shortcircuit calculation as well for informational purposes.

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