Economical Considerations to the Layout of Uninterruptible Power Supply Systems

An increasing number of critical electrical consumers in industry and commerce must have interruption- free, high-quality power supplies. As a result, uninterruptible power supply (UPS) systems have become increasingly important. Present applications cover the range of 500 VA to 500 kVA for individual units and by using parallel units, outputs of up to 2.5 MVA have already been reached. By provision of redundancy and also emergency power generators, an extensive series of modular system designs has been developed. In all cases, economy and operating availability are the prime considerations. The essential aspects of these considerations will be described for the various output series.