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Abstract

UPS systems have become a relatively standard and usually very reliable item of electronic equipment that can be used in a "self contained€VbCrLf modular format within a critical power distribution system to improve the reliability of power at any given point. UPS system design must be fault tolerant and maintainable, while the critical load must remain supported and fully operational. The objective should be for a system that allows any single part to fail, be repaired and tested, without affecting the operation of the critical load.

However, whilst the benefit of installing a single UPS module can be very great in terms of availability of reliable power, the improvement that it provides can only be as good the reliability of the UPS and battery and this will be further affected by any time when it is off-line each year for essential maintenance. For these reasons multiple UPS configurations have been developed to provide ever higher factors of availability. The four configurations shown below demonstrate some of the ways in which a systems designer can tailor the power protection system according to the demands of the critical application.

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