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ETAP Short Circuit software program allows for short circuit calculations based on ANSI and IEEE standards. In ANSI/IEEE short circuit software program, an equivalent voltage source at the fault location, which equals the prefault voltage at the location, replaces all external voltage sources and machine internal voltage sources.
Three different impedance networks are formed to calculate momentary, interrupting, and steady-state short circuit currents, and corresponding fault current duties for various protective devices. These networks are: ½ cycle network (subtransient network), 1.5-4 cycle network (transient network), and 30 cycle network (steady-state network).
Short Circuit Analysis Software ANSI & IEEE Toolbar
ANSI/IEEE Standards recommend the use of separate R and X networks to calculate X/R values. An X/R ratio is obtained for each individual faulted bus and short circuit current. This X/R ratio is then used to determine the multiplying factor to account for the system DC offset.
Evaluate LVCB Interrupting Capability Based on Maximum Voltage