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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

${\displaystyle {\mbox{SAIFI}}={\frac {\sum {\lambda _{i}N_{i}}}{N_{T}}}}$

where ${\displaystyle \lambda _{i}}$ is the failure rate, ${\displaystyle N_{i}}$ is the number of customers for location ${\displaystyle i}$ and ${\displaystyle N_{T}}$ is the total number of customers served. In other words,

${\displaystyle {\mbox{SAIFI}}={\frac {\mbox{total number of customer interruptions}}{\mbox{total number of customers served}}}}$

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

1. ^ Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Retrieved 18 June 2011.

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/SAIFI — Please support Wikipedia.

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