CAIFI

Reliability index used for electric power systems

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.

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

## References

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1. ^ Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Archived from the original on 26 December 2011. Retrieved 18 June 2011.
2. ^ Power Distribution Planning Reference Book, H. Lee Willis, published by CRC Press, 2004, page 112

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Reliability indices

Generic|

* MTBF
* MTTR
* FOR
* EFOR

Electricity distribution|

* ASUI
* ASAI
* CAIDI/SAIDI
* CAIFI/SAIFI
* MAIFI
* CTAIDI

Electricity generation|

* LOLP
* LOLE
* LOLEV
* LOLF
* LOLH

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