Page 254 - Offshore Electrical Engineering Manual

ETAP Short Circuit Analysis Software 241

Suitable program suites are available commercially from the organizations listed
in the Bibliography section.

TRANSIENT SIMULATIONS AND HARMONIC ANALYSIS
Most of the commercial programs available have other modules, including simulation
of generator outages and transient system upsets such as the starting of large electri-
cal drives. It is essential that such studies are carried out prior to specifying main
generation and switchgear ratings in order to ensure the system is going to be stable.
If it is expected that a large proportion of the electrically driven machinery is of vari-
able frequency or variable speed, harmonic analysis is also essential in order to calcu-
late the percentage Total Harmonic Distortion (%THD). It is important that the grouped
capacitance of lighting and any other large capacitive load is included in the model.
The following are examples of short circuit analysis and other outputs from three
proprietary programs available. There are a many more programs available on the
market, some of which are available free from switchgear manufacturers. The author
is not recommending any particular software, and to some extent, suitability of the
program will depend on:

• The particular engineer’s experience
• What particular graphic outputs are required
• Whether other results such as harmonic analysis, arc-flash studies, relay
discrimination graphs, etc., are required
• The hardware and software available for the program to run on
• Client and project preference

ETAP SHORT CIRCUIT ANALYSIS SOFTWARE
Etap.com Operation Technology, Inc. ©2017.
ETAP Short Circuit software program allows for fault calculations based on
ANSI/IEEE, IEC and GOST standards. The user-friendly interface, combined with
powerful analysis engine, saves hours of tedious hand calculations and takes the
guesswork out of fault analysis by automating the process with multiple calculation
and result analysis tools.
ETAP Short Circuit Software Key Features:

• IEC Standard 60909 • Determine worst case device duty results
• IEC Standard 61363
• ANSI/IEEE Standards C37 & UL 489 • Display critical and marginal alerts
• GOST (Russian) Standards R-52735 • Load terminal short circuit calculation
• Unbalanced L-G, L-L, and L-L-G faults • Generator circuit breaker evaluation
analysis
• Device evaluation for 3- and 1-phase • Comprehensive short circuit plots &
systems reports