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Reliability Considerations in Systems Applications of Uninterruptible Power Supplies

C.R. Heising, James F. Johnston

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Abstract

A redundant static inverter is applied as an uninterruptible power supply (UPS). A reliability analysis is presented showing that the introduction of a static bypass transfer switch brings about a reliability improvement of 8.5 to 1 in the mean time between failure (MTBF). This gives MTBF greater than 600 000 h. The static bypass transfer switch provides a synchronized automatic transfer in less than 1 ms from the UPS to the normal ac input power source upon a failure of the UPS.

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What this paper is about

A redundant static inverter is applied as an uninterruptible power supply (UPS). A reliability analysis is presented showing that the introduction of a static bypass transfer switch brings about a reliability improvement of 8.5 to 1 in the mean time between failure (MTBF). This gives MTBF greater than 600 000 h. The static bypass transfer switch provides a synchronized automatic transfer in less than 1 ms from the UPS to the normal ac input power source upon a failure of the UPS.

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Available abstract

A redundant static inverter is applied as an uninterruptible power supply (UPS). A reliability analysis is presented showing that the introduction of a static bypass transfer switch brings about a reliability improvement of 8.5 to 1 in the mean time between failure (MTBF). This gives MTBF greater than 600 000 h. The static bypass transfer switch provides a synchronized automatic transfer in less than 1 ms from the UPS to the normal ac input power source upon a failure of the UPS.

Key concepts: Uninterruptible power supply, Mean time between failures, Reliability (semiconductor), Reliability engineering, Transfer (computing), Maximum power transfer theorem, Power (physics), Inverter

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