Caifi

The Customer Average Interruption Frequency Index (CAIFI)^[1] is a popular reliability index used in the reliability analysis of an electric power system.^[2] It is designed to show trends in customers interrupted and helps to show the number of customers affected out of the whole customer base.

[math]\displaystyle{ \mbox{CAIFI} = \frac{\mbox{Total Number of Customer Interruptions}}{\mbox{Number of Distinct Customers Interrupted}} }[/math]

References

↑ Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Archived from the original on 26 December 2011. https://web.archive.org/web/20111226034249/http://www.ee.iastate.edu/~jdm/ee653/DistributionReliabilityPredictive.ppt. Retrieved 18 June 2011.
↑ Power Distribution Planning Reference Book, H. Lee Willis, published by CRC Press, 2004, page 112

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[1] Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Archived from the original on 26 December 2011. https://web.archive.org/web/20111226034249/http://www.ee.iastate.edu/~jdm/ee653/DistributionReliabilityPredictive.ppt. Retrieved 18 June 2011.

[2] Power Distribution Planning Reference Book, H. Lee Willis, published by CRC Press, 2004, page 112