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Short - Short Circuit Analysis

Accuracy and Interoperability

The Short program is especially accurate compared to some other short circuit analysis programs because it allows you to properly account for motors and generators precisely where they occur on the network, rather than just adding their contribution to the utility source kVA. And this DOS program provides interoperability with Elite's Panel and V-Drop programs too, so you can seamlessly exchange data with them. Download the functional demo version today and try it for yourself.

Features

Overview

The Elite Software Short Circuit Calculation DOS based program is a powerful yet easy to use tool that allows the designer to quickly obtain the maximum potential short circuit current at each node (bus) in a radial electric power distribution system with up to 2,000 components. Any combination of motors, generators, and capacitor banks up to a total of 1,500 is also allowed. The resistance and reactance data for all types of electrical components are stored on disk and automatically accessed by the program as needed. Specifically, "X" and "R" values are included for copper and aluminum cables, ACSR overhead cables, busway, switches, circuit breakers, current and voltage transformers, non-time delay and dual element fuses. All of the "X" and "R" values can be viewed and edited by the user. In addition, provision is made for the input of "special" components whereby the user can define his own "X" and "R" values for a non-standard device. Perhaps the most unique feature of the program is its ability to accurately handle motor and generator contributions. Many programs of this type, even some running on mainframe computers, do not properly account for motor loads as they simply have the user add the motor contribution to the utility source KVA. The Short program allows motors and generators to be placed anywhere in the network. The contribution from each motor and the utility source is vectorally added at every point where they intersect. This provides an extremely accurate analysis of the maximum current any node can be subject to. Finally, the fact that Short works in conjunction with Panel and V-Drop makes it especially useful.

Program Input

The Short Circuit program uses full screen editing features that provide a simple "fill in the blank" input procedure. All input data is checked at the time of entry so that no improper data can be entered. If you have a question about what the program is requesting, type a "?" and the program will offer additional explanations about the input data being requested. Upon completion of the input process, all data is saved to disk and can be reviewed and edited whenever desired. Two types of data are requested: general project data and specific electrical component data. The general project data includes the project name, client name, designer name, base KVA, initial short circuit KVA available, initial X/R ratio, and voltage at the first node of the system. Specific component data includes the component type (cable, busduct, transformer, switch, circuit breaker, fuse, etc.), the beginning and ending node numbers for each component, component size, length if applicable, and any other information necessary for defining a particular type of component. Input sheets are also provided for the easy organization of your data.

Program Output

The Short Circuit program provides two basic types of reports that can be printed either to the screen or the printer. The first report is a nicely formatted presentation of all the input data given for the project. The second report lists the symmetrical and asymmetrical fault current at each node (bus) in the network. Both three phase (bolted faults) and phase to neutral (ground faults) currents can be printed with and without motor and generator contributions. In addition, the X/R ratio and the per unit "X" and "R" values are listed for each node. These values are given so that manual verification of the fault currents can be more easily performed. See the sample reports on this page.

Calculation Method

The Short Circuit program uses the "per unit" method of calculation as described in the IEEE Std 241-1983 entitled "Electric Power Systems in Commercial Buildings", otherwise known as the "Gray Book". The per unit method was used so that many different voltages can exist throughout the network. This method also makes it easy to account for single and three phase systems operating at either 50 or 60 Hertz. The Short Circuit program is supplied with built-in "X" and "R" values for the various electrical components. These values were taken from several sources including the Bussmann's manual called "A Simple Approach to Short Circuit Calculations", the Federal Electric Pacific Catalog, and the GE Industrial Power Systems Data Book. However, these "X" and "R" values can be easily revised to any values that you want. Besides revising existing values, the Short Circuit program also allows you to create additional "X" and "R" table files so that many different types of data can be referenced. The program calculation method is explained in detail in the user's manual so that exact manual verification can be performed to check the program results.

System Requirements

Elite's DOS software application Short is compatible with all Windows operating systems (Windows 95, 98, ME, NT 4.0, 2000, and XP). The minimum hardware requirements to run our application are the same as the minimum hardware requirements to run the operating system which the application is installed on. Additionally, 1 MB of hard disk space is required to install and run Short.

Sample Reports

 


Sample Report 1


YOUR      COMPANY       NAME               PROJECT:         SAMPLE PROJECT
YOUR    COMPANY     LOCATION               CLIENT:        WILLIAMSON GROUP
YOUR       CITY,       STATE               DATE:             MARCH 3, 1989

ELITE SOFTWARE SHORT PROGRAM               DESIGNER:   BENITO FLORES-MEATH


SYSTEM DATA:                                                              

INITIAL SHORT CIRCUIT KVA:                   500,000                      
INITIAL SYSTEM VOLTAGE:                       12,470                      
INITIAL X/R RATIO:                                12                      
INITIAL NUMBER OF PHASES:                          3                      
INITIAL WIRING CONNECTIONS:                      WYE                      
PROJECT FILENAME:                             SAMPLE                      
PROJECT LOCATION:                       BRYAN, TEXAS                      
BASE KVA:                                     10,000                      
CYCLES IN HERTZ OF SYSTEM:                        60                      
LOCKED ROTOR MOTOR FACTOR:                       4.0                      
TEMPERATURE DEVIATION (DEG C):                     0                      
DEFAULT POWER FACTOR:                          0.800                      

DEFAULT X&R COMPONENT TABLE FILENAMES:                                    

CABLE DATA FILE:                               ELITE                      
BUS DUCT DATA FILE:                            ELITE                      
SWITCH DATA FILE:                              ELITE                      
CURRENT TRANSFORMER DATA FILE:                 ELITE                      
CIRCUIT BREAKER DATA FILE:                     ELITE                      
OVERHEAD CABLE DATA FILE:                      ELITE                      
FUSE DATA FILE:                                ELITE                      
VOLTAGE TRANSFORMER DATA FILE:                 ELITE                      





NETWORK COMPONENT SUMMARY:                    ACTIVE   INACTIVE      TOTAL

TOTAL NUMBER OF CABLES:                            1          0          1

TOTAL NUMBER OF OVERHEAD CABLES:                   1          0          1

TOTAL NUMBER OF BUS DUCTS:                         1          0          1

TOTAL NUMBER OF SWITCHES:                          0          0          0

TOTAL NUMBER OF VOLTAGE TRANSFORMERS:              1          0          1

TOTAL NUMBER OF CURRENT TRANSFORMERS:              0          0          0

TOTAL NUMBER OF CIRCUIT BREAKERS:                  0          0          0

TOTAL NUMBER OF FUSES:                             0          0          0

TOTAL NUMBER OF SPECIAL COMPONENTS:                0          0          0

TOTAL NUMBER OF NETWORK COMPONENTS:                4          0          4



TOTAL NUMBER OF MOTORS:                            1          0          1

TOTAL NUMBER OF GENERATORS:                        0          0          0

TOTAL NUMBER OF CAPACITOR BANKS:                   0          0          0

TOTAL NUMBER OF GENERAL PURPOSE LOADS:             0          0          0

TOTAL NUMBER OF MOT/GEN/CAP/LOADS:                 1          0          1

    

Sample Report 2


**** SHORT CIRCUIT CALCULATIONS PROGRAM BY ELITE SOFTWARE DEVELOPMENT ****
YOUR COMPANY NAME                                         YOUR CITY, STATE
SAMPLE PROJECT                MARCH 3, 1989                         PAGE 2
************** COMPONENT INPUT DATA AND COMPUTED SIZE REPORT *************

OVERHEAD CABLE DATA:                                                      

COMPONENT     BUS.VOLT MATERIAL PHASES  USER.SIZE Z0/Z1  SPACING.BTWN.LINE
NODES           LENGTH TABLE    STATUS  CALC.SIZE        [1-2] [2-3] [3-1]


10 - 20         12,470 ACSR     3 PHASE         -    15   1.00  1.00  1.00
POWER LINE 1       250 ELITE    ACTIVE          6                         


CABLE DATA:                                                               

COMPONENT.NODE  BUS.VOLT MATERIAL SHIELD   Z0/Z1 INSUL USER.SIZE    LENGTH
NODE.LABEL       CONDUIT TABLE    PHASES  CAB/PH       CALC.SIZE  C.STATUS

20 - 30           12,470 COPPER   YES         15  60 C        --        45
DROP LINE       MAGNETIC ELITE    3 PHASE      1              12    ACTIVE


VOLTAGE TRANSFORMER DATA:                                                 

COMPONENT.NODE PRI.VOLT X/R.RATIO USER.SIZE NEU.RES   TAP   Z0/Z1    TABLE
NODE.LABEL     SEC.VOLT IMPEDANCE CALC.SIZE  PHASES       SEC.WIR   STATUS

30 - 40          12,470      6.00   --- KVA    0.00 +0.0%       1    ELITE
TRANSFORMER         480      6.00   100 KVA 3 PHASE           WYE   ACTIVE


BUS DUCT DATA:                                                            

COMPONENT.NODES   BUS.VOLT   MATERIAL   TYPE     USER.AMPACITY      LENGTH
NODE.LABEL           Z0/Z1   TABLE      PHASES   CALC.AMPACITY    C.STATUS

40 - 50                480   COPPER     FEEDER             ---          30
MAIN TRUNK               1   ELITE      3 PHASE            225      ACTIVE


MOTOR DATA:                                                               

NODE   XR.RATIO MOT.FLA   RUN.PF MOTOR.TYPE  NEC.CODE STARTER.TYPE     RPM
MOTOR.LABEL      INRUSH START.PF VDROP.DIP    PF.CAPS LOCK.ROT.FAC  STATUS

50      6.00      124.0    0.780 INDUCTION          G FVNR  NEMA 1   3,600
MAIN PUMP         722.0    0.150 RUNNING         0.00  4.0          ACTIVE


Sample Report 3


**** SHORT CIRCUIT CALCULATIONS PROGRAM BY ELITE SOFTWARE DEVELOPMENT ****
YOUR COMPANY NAME                                         YOUR CITY, STATE
SAMPLE PROJECT                MARCH 3, 1989                         PAGE 3
*********************** SHORT CIRCUIT OUTPUT DATA ************************

NODE   VOLTS  NO  MOT/GEN CALC  PER.UNIT PER.UNIT  X / R  -SYMMT-  -ASSYM-
LABEL  @NODE  PH  STATUS  TYPE  -REACTN- -RESIST-  RATIO  CURRENT  CURRENT

10    12,470   3  NEITHER  3PH   0.01993  0.00166 12.000   23,150   28,976
UTILITY           MOTOR    3PH   0.01992  0.00166 11.992   23,165   28,994
                  MOT&GEN  3PH   0.01992  0.00166 11.992   23,165   28,994
                  NEITHER  G.F   0.01993  0.00166 12.000   23,150   28,976

20    12,470   3  NEITHER  3PH   0.02214  0.01250  1.772   18,212   18,472
POWER LINE 1      MOTOR    3PH   0.02212  0.01248  1.773   18,227   18,487
                  MOT&GEN  3PH   0.02212  0.01248  1.773   18,227   18,487
                  NEITHER  G.F   0.03244  0.06306  0.514    6,528    6,528

30    12,470   3  NEITHER  3PH   0.02235  0.01819  1.229   16,066   16,114
DROP LINE         MOTOR    3PH   0.02234  0.01817  1.230   16,080   16,128
                  MOT&GEN  3PH   0.02234  0.01817  1.230   16,080   16,128
                  NEITHER  G.F   0.03364  0.09534  0.353    4,580    4,580

40       480   3  NEITHER  3PH   5.94071  1.00459  5.914    1,996    2,307
TRANSFORMER       MOTOR    3PH   4.76050  0.80622  5.905    2,491    2,878
                  MOT&GEN  3PH   4.76050  0.80622  5.905    2,491    2,878
                  NEITHER  G.F   5.95200  1.08173  5.502    1,988    2,276

50       480   3  NEITHER  3PH   5.98277  1.10055  5.436    1,977    2,260
MAIN TRUNK        MOTOR    3PH   4.78601  0.86377  5.541    2,473    2,833
                  MOT&GEN  3PH   4.78601  0.86377  5.541    2,473    2,833
                  NEITHER  G.F   5.99406  1.17769  5.090    1,969    2,230
    

 


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