ASUI

The Average Service Unavailability Index (ASUI)[1] is a reliability index commonly used by electric power utilities. It is calculated as [math]\displaystyle{ \mbox{ASUI} = \frac{\sum{U_i N_i}}{\sum{N_i} \times 8760} = 1- \mbox{ASAI} }[/math]

where [math]\displaystyle{ N_i }[/math] is the number of customers and [math]\displaystyle{ U_i }[/math] is the annual outage time (in hours) for location [math]\displaystyle{ i }[/math]. ASUI can be represented in relation to SAIDI (where annual SAIDI is given in hours) as

[math]\displaystyle{ \mbox{ASUI} = \frac{\mbox{SAIDI}}{8760} }[/math]

## See also

* Average Service Availability Index (ASAI)
* ASIDI
* ASIFI
* ASUI
* CAIDI
* CAIFI
* CTAIDI
* MAIFI
* SAIDI
* SAIFI

## References

1. ↑ Pham, Hoang (8 April 2003). Handbook of reliability engineering. Birkhäuser. pp. 514. ISBN 978-1-85233-453-6. https://books.google.com/books?id=Xe6Z4wKQFMoC&pg=PA514. Retrieved 21 July 2011.

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