A Review of AC UPS Technology (Spiral bound)

There are a wide variety of uninterruptible power supply (UPS) systems available. This guide answers the key questions and highlights the main factors to be considered when selecting the appropriate UPS system for a particular application. A step-by-step plan for preparing a UPS specification is provided. The report covers rotary and static UPS at all power levels. Different configurations are described in detail, including on-line, off-line and modular. The merits of the various systems are compared on reliability, fault detection, efficiency, size, harmonic performance and cost. Background is provides on the functions performed within the UPS and the different options encountered. This report is a companion volume to report 91-0441 "Buyers' Guide to UPS and Power Conditioning Equipment".