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Text File | 1992-10-23 | 31KB | 1,062 lines

POWERPAK Version 1.0 Power Distribution Design Software for Electric Utility Engineers and Consultants by George Kwascha, PE copyright 1984, 1985 POWERPAK software has been placed in the public domain for free distribution. The programs are provided on as "as is" basis without warranty of any kind, expressed or implied, including but not limited to implied warranties of merchantability and application for a particular purpose. The user assumes all responsibility for damages of any sort arising from the use and/or application, direct or indirect, of PowerPak software. This software is not a replacement for good engineering practices. TABLE OF CONTENTS page Introduction ............................................. 3 System Files ............................................. 4 Preparing Your PowerPak System Disk ...................... 5 Running PowerPak ......................................... 5 General Instructions ..................................... 6 OPTION 1- Conductor Tables ............................... 7 OPTION 2- Voltage Drop Calculations ...................... 9 OPTION 3- Secondary Fault Current Calculations ........... 11 OPTION 4- Transformer Tables ............................. 12 Future Enhancements and Updates .......................... 14 Software Registration .................................... 15 Invoice and Feedback Form ................................ 16 2 ------------ INTRODUCTION ------------ PowerPak has been designed for use by the Electric Utility Distribution Engineer or Consultanting Engineer with the intent of simplifying basic design calculations necessary in providing electric utility service. This preliminary version provides tools for secondary voltages calculations. Future versions will support primary voltage circuit calculation tools. PowerPak allows the user to create a set of parameter tables for secondary conductors and transformers. This set of tables is utilized by PowerPak to make calculations easier for the user by eliminating the need to constantly look up specifications for voltage drop and fault current calculations. PowerPak allows the user to perform individual voltage drop or fault current calculations or create tabular outputs. This is further discussed in the documentation. Voltage drop calculations can be done with or without motor starting criteria. Secondary fault current calculations can be done at the point of delivery, whether it be at the transformer connections or at the end of the service conductor. PowerPak is menu-driven for ease of use with user prompts highlighted at the bottom of each screen. All data is entered on formated screens. PowerPak is designed to be run from a single floppy system with a minimum of 64K of memory with a color/graphics adaptor. 3 ------------ SYSTEM FILES ------------ PowerPak is configured to run self-contained on a floppy disk. The floppy disk can reside in either drive and the program will function properly as long as the resident drive is the default drive. PowerPak can also be operated from a hard disk as long as all files are in the same sub-directory and the sub- directory is the default directory. The following files come with the PowerPak 1.0 disk: README - initial instruction & help file POWERPAK.DOC - program documentation in ASCII format POWERPAK.TXT - program documentation in WordStar format POWERPAK.COM - main control and loading module MAINMENU.CHN - main menu CABLSPEC.CHN - secondary conductor data table access program TXSPECS.CHN - transformer data table access program SECVDROP.CHN - secondary voltage drop loading program CABLDROP.CHN - secondary conductor voltage drop calculator TXDROP.CHN - transformer voltage drop calculator CABLMOTR.CHN - secondary conductor voltage drop with motor starting calculation TXMOTR.CHN - transformer voltage drop with motor starting calculation STLTDROP.CHN - street light design voltage drop calculator STLIGHT.PIC - street light calculator input screen CABLE.DAT - secondary conductor data file TRANSF.DAT - transformer data file It is recommended that the user format a new disk with operating system and then transfer all the above files to this new disk before using the program. Store your original PowerPak disk in a safe place. 4 ----------------------------------- PREPARING YOUR POWERPAK SYSTEM DISK ----------------------------------- The first step in preparing your PowerPak system disk is formatting a new disk. Please follow instructions in your DOS manual, if you are not already familiar with this procedure. Be sure to format this new disk with the /S option. This will also transfer the DOS system onto your new disk. With the DOS system on your disk, you will be able to boot your system directly from the PowerPak disk. The next step in this process is to tranfer all PowerPak files to your newly formatted disk. Again, refer to your DOS manual if you are not familiar with this procedure. Using the COPY *.* command is recommended. For your information, the original PowerPak disk comes on an 8 sector formatted disk to allow compatibility with all versions of DOS. The disk is double-sided. ---------------- RUNNING POWERPAK ---------------- To start PowerPak, simply type POWERPAK from the A> prompt. Note that your PowerPak disk must be in drive A: throughout the duration of your session. You may wish to create a Batch file or and AUTOEXEC.BAT file. Refer to your DOS manual if you are not familiar with batch files. When creating a batch file, simply include POWERPAK as your last command. 5 -------------------- GENERAL INSTRUCTIONS -------------------- 1. All menus require single keystroke entry when choosing an option. Options are numbered anywhere from 0 to 9. 2. Except for the Main Menu, all single keystroke options are bracketed with { } on menu screens. 3. There are several standard prompts that will appear at the bottom of the screen: Field {#} - hit the appropriate number that corresponds with the field that you wish to correct. {+} - hitting the plus sign will increment the record forward by one. {-} - hitting the minus sign will increment the record backwards by one. {M} - hitting the "M" key will return you to the previous menu. {E} - hitting the "E" key will allow you to view or print the entire file. {P} - hitting the "P" key will specify that any output be redirected to the printer. {S} - hitting the "S" key will specify that any output be directed to the screen. {space} - hitting the space bar will scroll window data. {RETURN} - hitting the Return or Enter key will perform the action specified in the prompt. These will vary from screen to screen. 4. Hitting the {ESC} key from most prompts in the program will return you to the previous menu. 5. The only other type of data entry prompt is found in the conductor and transformer data files, where the ---> prompt asks you to enter a code. Since this code can be more than one character in length, it will be necessary for you to terminate your entry by hitting the RETURN or ENTER key. 6. Use {SHIFT} + {PrtSc} to dump screen results to your printer. 6 ------------------------------------- MAIN MENU OPTION 1 - CONDUCTOR TABLES ------------------------------------- The Conductor Data file can be accessed by choosing option 1 from the Main Menu. You will be presented with a menu that allows you to Add, Edit, Delete and Print/View your conductor records. A sample data file is provided on the disk. If your conductors do not match the ones specified in this sample file, you may change the appropriate conductors one by one or you may delete the CABLE.DAT file and start your own file. The Edit option allows you to change data in each record. The Add option allows you to add records to the file. If the file does not exist, the Add option will create the file automatically. Option 4 is not functional at this time. {1} ADD CONDUCTOR DATA When this option is chosen you will be presented with a data input screen that allows you to enter the following conductor parameters: Conductor Code- a unique code assigned by the user. This code can be up to 3 characters in length, comprised of numbers or letters. It is used to retrieve conductor data records. This value is treated as a string variable. Cable Type- 20 spaces are provided for the user to describe the type of conductor. Phase Conductor Size- 9 spaces are provided for the user to record the size of the phase conductor. Rated Amps- 3 spaces are provided to denote the rated current carrying capacity of your cable. Phase Cond Resistance- specify the phase conductor resistance value in ohms/1000 feet. 6 spaces are provided. Phase Cond Reactance- specify the phase conductor reactance value in ohms/1000 feet. 6 spaces are provided. Neutral Conductor Size- 9 spaces are provided for the user to record the size of the neutral conductor. If the size is the same as the phase conductor, just hit the RETURN key. Neutral Cond Resistance- specify neutral conductor resistance value in ohms/1000 feet. 6 spaces are provided. If this value is the same as the phase conductor, just hit the RETURN key. 7 Neutral Cond Reactance- specify neutral conductor reactance value in ohms/1000 feet. If this value is the same as the phase conductor, just hit the RETURN key. {2} EDIT CONDUCTOR DATA When this option is chosen you will be prompted for the conductor code that you wish to edit or you can scroll the file forward or backward by hitting the plus and minus key respectively. When you wish to edit a field on the displayed screen, type the number of the field and then re-enter your data. {3} DELETE CONDUCTOR DATA When this option is chosen you will be prompted for the conductor code that you wish to delete. The Delete option does not actually delete the record. Any record that is deleted by the user is only marked for deletion. The next record that is added is written into the record space of your deleted record. {5} PRINT/VIEW CONDUCTOR RECORDS When this option is chosen you will be prompted for a conductor code. If you type a plus sign, the records will be scrolled on the screen. Typing the letter "E" specifies the entire file. When specifying the entire file, you will also be prompted for screen or printer output. {6} RETURN TO MAIN MENU This option returns you to the Main Menu. 8 -------------------------------- MAIN MENU OPTION 2- VOLTAGE DROP -------------------------------- The Voltage Drop calculation option is comprised of five different types of calculations. {1} Service Cable Voltage Drop- calculates the voltage drop on secondary conductors under normal loading conditions. The conductors must be in the conductor data file. {2} Transformer Voltage Drop- calculates the voltage drop in the transformer core under normal loading conditions. This value should be added to the service cable voltage drop to get the total drop seen by the associated load. The transformers must be in the data file. The two sections above have the same basic screen input design. A sub-menu will allow you to choose whether you wish to perform one calculation for a particular situation or whether you wish to create a set of voltage drop tables for various parameters. The table creation feature is a very valuable feature that allows you set up a complete set of tables for each transformer and conductor with different ranges of footage and load. The single calculation option will prompt you for a conductor or transformer code by displaying a window of the data file and allowing you to scroll through the file searching for your conductor or transformer. You will be prompted for power factor and load values. The conductor calculation will also require the entry of the number of phases, voltage, and conductor length in feet. It will also ask you to specify single or parallel conductors. The cable option will calculate the line-to-neutral and line-to line voltage drop in volts and percent. The transformer option will calculate the voltage drop in percent for the given load and for full load. The full load value can be used as a worst case value if there are other loads connected to the transformer. The respective table calculation option will need some additional values. The cable option will requires a starting load value with an increment. For example, if you wish to start your table at 10 KW and increment it by 5 KW, you would specify the starting load at 10 KW and load increment at 5 KW. Values for starting length and length of increment in feet are also needed. The transformer option only requires the starting load and load increment values. {3} Cable Voltage Drop for Motor Starting- calculates the voltage drop associated with motor starting only. 9 {4} Transformer Voltage Drop for Motor Starting- calculates the voltage drop associated with motor starting only. This value may be added to the Cable Motor Starting value to get the total drop due to starting motors. The two sections above have the same basic screen input design as the voltage drop calculations without motor starting. The only additional parameter needed is a value for the starting amps of the motor or motors. This value is usually a nameplate value called locked-rotor amps. An approximate value of six times the normal current can also be used. {5} Street Light Voltage Drop- a specialized section designed to calculate voltage drops for street light design. This option presents you with a graphic representation of a street light circuit, showing cable impedance and luminaire locations. A table allowing input of footage, conductor code and number of luminaires at each point is displayed. Enter the secondary voltage at the prompt. Enter the load per luminaire next. This program assumes that all luminaires in use are the same. Enter the luminaire load value in VA, not KVA! Next, the program will allow you to scroll through the conductor file to pick out your cable size. Enter the conductor code of the segment in column one. Enter the number of feet in each segment in the second column. The third column requests the number of luminaires that are connected at that point and beyond. For example, if one luminaire is connected at points 1, 2, and 3, then you specify 3 luminaires at point 0 to 1. At point 1 to 2 you specify 2 luminaires and 1 luminaire at point 2 to 3. After the entry of each line segment, the program will calculate and display the voltage drop, the actual voltage at that end point, and the total percent drop at the end point. A suggestion ... if you have more than 10 luminaires, you can combine cable segments and luminaires into one point near the voltage source. In this manner you will still be able to get the voltage drop values toward the end of the circuit. 10 ---------------------------------- MAIN MENU OPTION 3 - FAULT CURRENT ---------------------------------- Option 3 will allow you to perform secondary fault caluclations with ease. You can make single calculations or create tables of fault currents for each type of conductor in the data file. This is done in much the same manner as described in the Voltage Drop sections. You will need to specify a transformer code and an optional conductor code and conductor length. This is done in the same manner as described in the previous sections by scrolling through the data files in the window displays. If a fault value is needed at the transformer spades only, then a conductor code should not be entered. If a conductor code is entered, then you must specify a conductor length of zero feet, otherwise the calculation will include the secondary conductor and the fault current value given, will be at the end of the conductor. A table of fault currents is generated for conductors of various lengths only, with a particular transformer type. A table of various transformers cannot be generated. Use the single calculation option to do this. 11 --------------------------------------- MAIN MENU OPTION 4 - TRANSFORMER TABLES --------------------------------------- The Transformer Data file can be accessed by choosing option 4 from the Main Menu. You will be presented with a menu that allows you to Add, Edit, Delete and Print/View your conductor records. A sample data file is provided on the disk. If your conductors do not match the ones specified in this sample file, you may change the appropriate conductors one by one or you may delete the TRANSF.DAT file and start your own file. The Edit option allows you to change data in each record. The Add option allows you to add records to the file. If the file does not exist, the Add option will create the file automatically. Option 4 is not functional at this time. {1} ADD TRAMSFORMER DATA When this option is chosen you will be presented with a data input screen that allows you to enter the following transformer parameters: Transformer Code- a unique code assigned by the user. This code can be up to 3 characters in length, comprised of numbers or letters. It is used to retrieve transformer data records. This value is treated as a string variable. Transformer #- 5 spaces are provided for a transformer number if necessary. Transformer Type- 20 spaces are provided for the user to describe the type of transformer, ie. aerial or pad-mounted. # phases- specify "1" for single phase or "3" for three phase transformers. TX Size (KVA)- 4 spaces are provided to record the transformer KVA. TX Impedance (%)- 5 spaces are provided for the transformer impedance value in percent. Nameplate Voltage Rating- 32 spaces are provided to record the nameplate voltage information. Secondary Volts (line-line)- record the secondary voltage in volts. 5 spaces are provided. Line-to-line or phase-to-phase voltage must be used. This value is used in the calculations. Total Losses (Watts)- 5 spaces are provided to enter the transformer total full load losses expressed in watts. This 12 value includes no load core loss and full load copper loss. No Load Loasses (Watts)- 5 spaces are provided to enter the transformer no load core loss in Watts. {2} EDIT TRAMSFORMER DATA When this option is chosen you will be prompted for the transformer code that you wish to edit or you can scroll the file forward or backward by hitting the plus and minus key respectively. When you wish to edit a field on the displayed screen, type the number of the field and then re-enter your data. {3} DELETE TRANSFORMER DATA When this option is chosen you will be prompted for the transformer code that you wish to delete. The Delete option does not actually delete the record. Any record that is deleted by the user is only marked for deletion. The next record that is added is written into the record space of your deleted record. {5} PRINT/VIEW TRANSFORMER RECORDS When this option is chosen you will be prompted for a transformer code. If you type a plus sign, the records will be scrolled on the screen. Typing the letter "E" specifies the entire file. When specifying the entire file, you will also be prompted for screen or printer output. {6} RETURN TO MAIN MENU This option returns you to the Main Menu. 13 ------------------------------- FUTURE ENHANCEMENTS AND UPDATES ------------------------------- PowerPak is distributed under a modified user-supported shareware concept. Please read the following statement under software registration for a complete explanation. The author is relying on the users of PowerPak to make suggestions for improvements and enhancements that they would like to see. The author will notify all registered users any time revisions are made to PowerPak. Registered users may then obtain a copy of the updated disk for a $5.00 fee (subject to change). This fee is to cover the cost of disk media, postage and handling. The user may also choose to send a blank disk with proper enclosed return postage for a free updated copy. The disk mailer must be re-usable. The author has spent a great deal of his own time writing this program, with hopes of benefiting from user contributions. The software availability of good inexpensive programs in the electric utility area is limited. PowerPak is an attempt to change this. With your help and support, maybe, we can encourage other engineers to write and release their programs to the realm of User-Supported Shareware. Help make this experiemnt a success and send a donation. If you have written useful engineering software and wish to participate in this experiment please let us know. Wordstar is a registered trademark of MicroPro International. 14 --------------------- SOFTWARE REGISTRATION --------------------- PowerPak is distributed under a modified version of the shareware concept. PowerPak has been released to the public domain for free distribution. Users are encouraged to copy the program for use by others. This includes use by individuals and companies. This program may not be sold without written permission of the author, with one exception. Non-profit organizations, such as computer clubs, user-groups and electronic bulletin boards may sell this software as long as it is for no more than $6.00. Source code is not available. The author will support PowerPak users for a one time contribution of $10.00. Support includes notification of future updates, corrections of any "bugs" in the software, and any relevant written correspondence that requires a written reply. All users, however, are encouraged to supply the author with any suggestions for future improvements to this software and any other comments that do not require a written reply by the author. The author will not supply copies of PowerPak without a contribution of $10.00 for user-support and an additional $5.00 for postage, handling and disk media. Free copies of this software can be obtained from your colleagues, computer clubs, user groups or electronic bulletin boards. If you have obtained a free copy of this software and wish to register with the author please send your contribution of $10.00 only. Please use the attached invoice form for all correspondence. 15 ------------------------------ INVOICE AND USER FEEDBACK FORM ------------------------------ Name: __________________________________________ Company: _______________________________________ Address: _______________________________________ City: ________________ State: ____ Zip: ________ =============================================================== Item Description | Price Ea | Price =============================================================== | | PowerPak 1.0 Registration fee | $10.00 | $ | | PowerPak 1.0 software on 5" disk | $ 5.00 | $ postage included | | -----------------------------------------------------|--------- Total | =============================================================== Make checks payable to: Information Management Solutions, Inc Send To: Information Management Solutions, Inc P.O. Box 13263 Durham, N.C. 27709 List any comments or suggestions for future improvements to PowerPak below. Use reverse side if necessary. Your interest is appreciated. 16 rest i