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Old 09-27-2006, 03:16 AM
Zitibake Zitibake is offline
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Join Date: Dec 2005
Posts: 113
Default frequency of sustained power interruption?

I have a cost-concious customer who needs lots of power, but not much redundancy. I'm considering some cheaper power options for him: possibly UPS with fewer battery cabinets; maybe even flywheels with no gen-set backup. However, I'm unsure how to set expectations for the outages that will result.

My utility company publishes its expected frequency of "sustained" interruptions (over 2 seconds in duration) via the SAIDI benchmark. But I wonder how often to expect interruptions over 10 seconds in duration; or over 6 minutes; or over 10 minutes.

Has anyone seen a distribution curve of interruption duration, in seconds, for their utility?
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