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The '''System Average Interruption Frequency Index (SAIFI)'''<Ref>{{cite web | |||
|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. SAIFI is the average number of interruptions that a customer would experience, and is calculated as | |||
<math>\mbox{SAIFI} = \frac{\sum{\lambda_i N_i}}{\sum{N_i}}</math> | |||
where <math>\lambda_i</math> is the failure rate and <math>N_i</math> is the number of customers for location <math>i</math>. In other words, | |||
<math>\mbox{SAIFI} = \frac{\mbox{total number of customer interruptions}}{\mbox{total number of customers served}}</math> | |||
SAIFI is measured in units of interruptions per customer. 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 1.10 interruptions per customer. | |||
==References== | |||
{{reflist}} | |||
==See also== | |||
*[[SAIDI]] | |||
*[[CAIDI]] | |||
*[[MAIFI]] | |||
*[[CAIFI]] | |||
*[[ASAI]] | |||
*[[ASUI]] | |||
{{DEFAULTSORT:Saifi}} | |||
[[Category:Electric power]] | |||
Revision as of 15:16, 5 July 2013
The System Average Interruption Frequency Index (SAIFI)[1] is commonly used as a reliability indicator by electric power utilities. SAIFI is the average number of interruptions that a customer would experience, and is calculated as
where is the failure rate and is the number of customers for location . In other words,
SAIFI is measured in units of interruptions per customer. 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 1.10 interruptions per customer.
References
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