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V-Drop - Voltage Drop Analysis

Comprehensive and Customizable

The V-Drop program covers all the bases when it comes to voltage drop calculations. The calculation method it uses makes it easy to account for voltage transformers, single and three phase systems, and frequencies of 50 or 60 hertz. Plus it comes with built-in X and R values for lots of electrical components, which you can customize and add to. Download the functional demo of V-Drop today and check it out for yourself.

Features

Overview

The Elite Software V-Drop program allows you to quickly and accurately obtain the voltage drop at each node (bus) in a radial electric power distribution system. The voltage drop values are calculated on a "per segment" and "cumulative" basis and then printed as a percentage of the source voltage and as an absolute voltage drop in volts. In addition, the nominal and actual voltages occurring at each point in the network are printed. V-Drop can handle networks containing up to 2,000 components with their associated KVA loads and power factors. The resistance and reactance data for all types of electrical components are stored on disk and are 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, and current transformers. Voltage transformers in the one-line diagram may be accounted for as correction devices with no voltage drops, or as simple loaded components. Generators can be entered to correct the voltage at any bus as well. All of the stored "X" and "R" values can be changed by the user to any values desired. Provisions are also made for the input of "special" components whereby the designer can define his own "X" and "R" values for a non-standard device. All data is checked as it is entered and the program is very easy to use and understand. The V-Drop reports not only show computed results, but also reflect all the input data pertaining to those results. V-Drop can work stand alone or in conjunction with the Short and Panel programs.

Program Input

The Voltage Drop 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, 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, etc.), the beginning and ending node numbers for each component, component size, length if applicable, the KVA load on the component if present, 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 V-Drop 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. All input data is reflected in this report and the components are listed by type and whether their status is active or inactive. The default X&R component table filenames are also listed. The second report lists the absolute and percent voltage drops for each component segment in the network. These voltage drops are listed on both a "per segment" and "cumulative" basis as a percentage of the source voltage and as an absolute voltage drop in volts. The nominal and actual voltage resulting at the end of each segment is printed as well. In addition, the number of phases (three or single), the "X" and "R" values, the KVA load, and the power factor for that KVA load are listed for each segment. These values are given so that manual verification of the voltage drops can be more easily performed. Shown at the bottom of this page are sample reports for a small project with five buses and four components with loads.

Calculation Method

The V-Drop program uses the percent method of voltage drop calculation as described in the GE Distribution Data Book (GET-1008H). This method makes it easy to account for voltage transformers, single and three phase systems, and frequencies of 50 or 60 hertz. V-Drop 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 values can be easily revised to anything you want. Besides revising existing values, the V-Drop program also allows you to create additional "X" and "R" files so that many different types of data can be referenced. The program calculation method is detailed in the user's manual so that exact manual verification can be easily performed to check the program results. The comprehensive user's manual also includes tutorial information concerning the use of the program and general voltage drop considerations in system design.

System Requirements

Elite's DOS software application V-Drop 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 that the application is installed on. Additionally, 1 MB of hard disk space is required to install and run V-Drop.

Sample Reports


Sample Report 1


YOUR      COMPANY       NAME               PROJECT:        EXAMPLE PROJECT
YOUR      COMPANY       TYPE               CLIENT:        WILLIAMSON GROUP
CITY,                  STATE               DATE:             JUNE 10, 1993
ELITE SOFTWARE VDROP PROGRAM               DESIGNER:      WILLIAM W. SMITH


SYSTEM DATA:                                                              

INITIAL SHORT CIRCUIT KVA:                  INFINITE                      
INITIAL SYSTEM VOLTAGE:                       12,470                      
INITIAL X/R RATIO:                                 0                      
INITIAL NUMBER OF PHASES:                          3                      
INITIAL WIRING CONNECTIONS:                      WYE                      
PROJECT FILENAME:                              TEST1                      
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


**** VOLTAGE DROP CALCULATIONS PROGRAM BY ELITE SOFTWARE DEVELOPMENT *****
YOUR COMPANY NAME                                              CITY, STATE
EXAMPLE PROJECT               JUNE 10, 1993                         PAGE 2
************** COMPONENT INPUT DATA AND COMPUTED SIZE REPORT *************

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         12        45
DROP LINE      MAGNETIC ELITE    3 PHASE      1               --    ACTIVE


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          6     15  1.00  1.00  1.00
POWER LINE 1      250 ELITE    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               504    COPPER      FEEDER             225         30
MAIN TRUNK              5    ELITE       3 PHASE            ---     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   100 KVA     0.00 +5.0%       1   ELITE
TRANSFORMER         480      6.00 ——- KVA  3 PHASE           WYE    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    0.200 RUNNING        0.00   4.0         ACTIVE


Sample Report 3


**** VOLTAGE DROP CALCULATIONS PROGRAM  BY ELITE SOFTWARE DEVELOPMENT ****
YOUR COMPANY NAME                                              CITY, STATE
EXAMPLE PROJECT               JUNE 10, 1993                         PAGE 3
************************ VOLTAGE DROP OUTPUT DATA ************************

COMPONENT    NO  -RESIST.-  KVA LOAD   SEGM.%VDROP SEGM.VDROP  NOM.VOLTAGE
LABEL        PH  -REACTN.-  P.FACTOR   CUMM.%VDROP CUMM.VDROP  ACT.VOLTAGE
                                          KVA.LOSS  KVAR.LOSS      KW.LOSS

10 - 20       3   0.168500     108.2        0.0106       1.33    12,470.00
POWER LINE 1      0.034325     0.780        0.0106       1.33    12,468.67
                                            0.0115     0.0072       0.0090

20 - 30       3   0.088560     108.2        0.0050       0.62    12,470.00
DROP LINE         0.003285     0.780        0.0156       1.94    12,468.06
                                            0.0054     0.0034       0.0042

30 - 40       3   0.025056     108.2        4.8418      24.40       504.00
TRANSFORMER       0.150336     0.780        4.8574      24.48       479.52
                                            5.2411     3.2798       4.0881

40 - 50       3   0.002211     108.2        0.0993       0.50       504.00
MAIN TRUNK        0.000969     0.780        4.9568      24.98       479.02
                                            0.1075     0.0673       0.0839



VOLTAGE DROP SUMMARY:                                                     

WORST PERCENT VOLTAGE DROP OCCURS AT NODES:   30 -   40 WITH 4.8418% VDROP

WORST PERCENT VOLTAGE DROP PATH ENDS AT NODE: 50        WITH 4.9568% VDROP

TOTAL NETWORK LOSSES:          5.366 KVA        3.358 KVAR        4.185 KW

 

 


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