ASUI

The Average Service Unavailability Index (ASUI)^[1] is a reliability index commonly used by electric power utilities. It is calculated as

${\mbox{ASUI}}={\frac {\sum {U_{i}N_{i}}}{\sum {N_{i}}\times 8760}}=1-{\mbox{ASAI}}$

where $N_{i}$ is the number of customers and $U_{i}$ is the annual outage time (in hours) for location $i$ . ASUI can be represented in relation to SAIDI (where annual SAIDI is given in hours) as

${\mbox{ASUI}}={\frac {\mbox{SAIDI}}{8760}}$

References

↑ Pham, Hoang (8 April 2003). Handbook of reliability engineering. Birkhäuser. p. 514. ISBN 978-1-85233-453-6. Retrieved 21 July 2011.

[Pham2003-1] Pham, Hoang (8 April 2003). Handbook of reliability engineering. Birkhäuser. p. 514. ISBN 978-1-85233-453-6. Retrieved 21 July 2011.

[1]

v t e 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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ASUI

References