Page 256 - Offshore Electrical Engineering Manual

ETAP Short Circuit Analysis Software 243

Report Analyser to Compare Studies and Identify Worst Case.

ETAP ANSI Short Circuit Features ETAP IEC Short Circuit Features
• Determine maximum and minimum • Unbalanced L-G, L-L and L-L-G faults
short circuit fault currents analysis
• Calculate ½ cycle, 1.5–4 and 30 cycle • Transient short circuit calculations to
balanced and unbalanced faults generate individual A, B and C phase
• Check momentary and interrupting currents
device capabilities • Compares device ratings with calculated
• Check closing & latching capabilities short circuit values
• Evaluate symmetrical or total rated • User-definable voltage C factor
circuit breakers • Service or ultimate short circuit current
• Special handling of generator circuit ratings for LVCB breaking capability
breakers • User-definable R/X adjustment methods
• Interrupting duty as a function breaker for Ip (method A, B, or C)
contact parting time • Negative or positive impedance adjust-
I
″
• Standard and user-definable contact ments for max/min k and Ik
parting time • Automatic application of K correction
• Automatically includes No AC Decay factors (i.e., KT, KG, KSO)
(NACD) ratio • Automatically determines meshed and
• User options for automatic adjustment non-meshed networks for calculating Ib,
of HVCB rating Ik and Idc
• Considers both near and far from
generator short circuits