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The '''System Average Interruption Duration Index (SAIDI)'''<Ref>{{cite web
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|url =http://www.ee.iastate.edu/~jdm/ee653/DistributionReliabilityPredictive.ppt
|title = Distribution System Reliability Evaluation
|first = Sree
|last = Yeddanapudi
|publisher= Iowa State University
|accessdate = 18 June 2011
}}</ref> is commonly used as a reliability indicator by electric power utilities. SAIDI is the average outage duration for each customer served, and is calculated as:
 
<math>
\mbox{SAIDI} = \frac{\sum{U_i N_i}}{\sum{N_i}}
</math>
 
where <math>N_i</math> is the number of customers and <math>U_i</math> is the annual outage time for location <math>i</math>. In other words,
 
<math>\mbox{SAIDI} = \frac{\mbox{sum of all customer interruption durations}}{\mbox{total number of customers served}}</math>
 
SAIDI is measured in units of time, often minutes or hours. It is usually measured over the course of a year, and according to IEEE Standard 1366-1998 the median value for North American utilities is approximately 1.50 hours.
 
==See also==
*[[SAIFI]]
*[[CAIDI]]
*[[CAIFI]]
*[[MAIFI]]
*[[ASAI]]
*[[ASUI]]
 
==References==
{{Reflist}}
 
{{DEFAULTSORT:Saidi}}
[[Category:Electric power]]

Latest revision as of 15:40, 11 November 2014

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