ELECTRIC SHORT CIRCUIT CURRENT PROGRAM USES LATEST IMPEDANCE MATRIX
MATHEMATICS, HANDLES 700 BUS LEVELS

MC2 Engineering Software has announced a new version 4.0 of its electrical
short circuit current software E3M, employing a Bus Impedance Matrix
solution to the short circuit current calculation. The program uses a
direct matrix building procedure for speed and allows large networks to be
handled with no direct limits on numbers of buses. The program may be used
on either radial or looped systems, supplied by utilities, by generators,
or by both.

Large networks are handled by reduction to a "mesh equivalent" which allows
particular areas of interest to be studied using relatively small, fast
equivalent matrices without any sacrifice in accuracy.

The E3M program reports out three-phase bolted symmetrical, asymmetrical,
instantaneous peak fault currents, line-to-line symmetrical currents, and
single-phase symmetrical fault currents. It also reports X/R ratios,
Z-values and voltage drops at normal loads throughout the system. A
per-unit methodology is used.

E3M Version 4.0 will display the detailed conditions at each device branch
and fault, or go directly to its listing of results for each fault in the
system. The detailed list is presented in a "pseudo line diagram" which
incorporates the full description of each device along with the conditions
at that point.

The program calculates power factors throughout the system and outputs a
DXF file to disk to facilitate transfer of inputs and outputs to CAD
programs. E3M carries tables of the electrical characteristics of all
standard sizes of nearly thirty different types of equipment including all
types of cable and wire, buses, breakers, fuses, switches, transformers,
and overhead wire. Non- standard transformers are accepted, and heavy
rotating equipment such as large motors and generators.

Windows have been provided to permit onscreen conductor sizing
automatically or through ampacity tables. Inputs are made through modern,
full-function screens with default values wherever possible, "help"
messages at every input, input checking to assure reasonable values, error
messages, broad use of function keys with pop-up screens, and almost no
risk of loss of data. Inputs and output printouts are formatted for
clarity and are suitable for client presentation.

The E3M program has application in electric utilities, industrial plant
systems, commercial building electrical systems, malls, airports,
university complexes, hospitals and municipal systems. E3M lends itself to
initial design work or system maintenance, where a model of the system can
be updated periodically to keep constant control of system breaker
protection. The program has been applied to shipboard use by U.S. Navy
contractors and is used by several of the biggest names in the electrical
industry in the U.S.

E3M Version 4.0 is supplied on non-protected disks and runs on all
IBM-compatible microcomputers, automatically setting itself up for
monochrome or color and other machine characteristics. Customer assistance
is supplied to registered users at no charge via telephone hot line. A
demonstration disk is available.

The E3M program has been widely accepted in the electrical engineering
community since it was first introduces by MC2 in 1980. MC2 Engineering
Software has specialized in engineering software for microcomputers since
1977 and has long been a leader in this field. MC2 program EN4M for Energy
Consumption in Commercial Buildings and Economic Analysis of Energy Saving
Alternatives is widely used by electrical engineers.

MC2 offers more than twenty programs for most engineering disciplines,
including mechanical, HVAC, hydraulic, fire sprinkler design, electrical
engineering, structural engineering, energy management, solar energy and
project management. The Miami firm has more than 7000 users of its
programs, in over sixty countries worldwide. MC2 Energy Software may be
contacted by telephone at 305-665-0100, by fax at 305-665-8035, or by mail
at 8107 SW 72 Ave. #425E, Miami, FL 33143.

MC2 Engineering Software's Internet address is MC2EngSoft@AOL.com and may
be reached on America OnLine at MC2EngSoft and on CompuServe at
MC2EngSoft@CompuServe.com. Functional demonstration disks of MC2 software
may be downloaded through AOL by selecting "Go To" then "Search Software
Libraries" then type in "MC2 Engineering."
 
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