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APPENDIX A Sizing Generator Sets with GenSize� Overview APPENDIX A Rev. Jan 2011 Application Manual – Liquid Cooled Generator Sets GenSize��is a software application (available on the Power Suite CD from Cummins Power Generation) for determining the proper size (capacity) of generator sets for your standby or prime power applications. All of the information needed to order an appropriate generator set configuration from your local distributor is included in the recommendation prepared by the software. In the Library CD that accompanies the Power Suite CD, you can also view and print an array of product information necessary to properly design a complete power generation system. Information on the Library CD includes: generator set specification sheets, technical support information (alternator data, generator set exhaust emissions data, generator set acoustic data, generator set prototype test summaries) and key drawings (outline, schematic, wiring diagrams, and accessory installation drawings). With GenSize you can create, save, retrieve, modify, and delete information within a project. Load information can be copied and pasted within or between multiple projects. GenSize handles most load types including various lighting types, HVAC, Battery Charging, UPS, motors, Fire Pumps and general loading. A user–defined load area is available for the user to input characteristics of a unique load. GenSize correctly handles welding, cyclic, and medical imaging loads (where load surge occurs after all loads have been started and not during the starting sequence itself). NOTE: When GenSize is used as the basis for sizing a generator set from a manufacturer other than Cummins Power Generation, be aware that competitive generator sets of the same kW rating may not be suitable for a given application due to differences in performance. The power system designer can minimize risk in this situation by specifying a generator set with similar alternator temperature rise, alternator per unit subtransient reactance, harmonics, and governor transient performance. In addition to being a tool for viewing generator set performance data, GenSize includes an easy–to–use graphical interface for entering information about the loads placed on the generator set, the starting step sequence of the loads, and parameters for the generator set itself. Although there is no separate manual for GenSize, its context–sensitive Help files should be sufficient for running the application. Applications There are four Applications within the Power Suite: GenSize, Library, GenCalc and GenSpec. In GenSize, the project as a whole is displayed on the left side, while the right shows the contents of any node selected from the left side. This is the core of the application where loads and sequence are input and defined. The Library Application allows the user to explore product specifications and data, application drawings and other pertinent information, and to incorporate this data into a project report. The Library is accessed through a Library Contents CD. The Library contents CD may be copied to a PC hard drive for access convenience. The GenCalc Application includes a Decrement Curve Calculator for the alternators used on Cummins generator sets. This application is designed to include several future applications for assistance in designing exhaust and fuel systems as well as other facets of power systems. A–3
Application Manual – Liquid Cooled Generator Sets Project Parameters The GenSpec Application contains a selection of Word documents featuring sample specifications for generator sets, paralleling equipment, and transfer switches. More information about these Applications can be found in the GenSize Help area. Installing Power Suite Insert the Power Suite CD in the CD–ROM drive and follow the software installation instructions on the screen, or select Start/Run from the Windows desktop, select the CD ROM drive and run Setup.exe. The GenSize software is designed to run in a Windows NT, 95, 98, or 2000 operating system environment. The browser function for the Library CD is optimized for Internet Explorer 5.0 and Adobe Acrobat 4.0 (included on the CD). After installation is complete, a New Project dialog box will appear – Select New Project. The first step in sizing and selecting an engine–generator set is to establish project parameters. At a minimum, the generator set must be sized to supply the maximum load starting steady–state running requirements of the connected load equipment. To set the default project parameters, select Projects from the top tool bar, then New Project Default Parameters at the bottom of the pull–down menu. The resulting dialog box, Figure A–1, shows New Project Parameters that are applied to all new projects and can be altered to suit your preferences. The project parameters for a single or an existing project can be changed without altering the default parameters by highlighting the project name then selecting Projects, Edit, and then the parameters tab. Following is an explanation of the project parameters and the default entries shown in the dialog box. Number of Generator Sets Running In Parallel The default value is 1. If the total load is greater than the capacity of a single generator set, insert 2, 3, or more as appropriate. If the total load is above 1000 kW, it may be advantageous to parallel generator sets for higher reliability and operational flexibility. When the total load is 300 kW or less, however, it is usually not cost–effective to parallel generator sets – although it is technically feasible. A–4 APPENDIX A Rev. Jan 2011
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