Average Service Availability Index

The Average Service Availability Index (ASAI)^[1]^[2] is a reliability index commonly used by electric power utilities. ASAI is calculated as

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

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

${\mbox{ASAI}}=1-{\frac {\mbox{SAIDI}}{8760}}$

References

^ Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Archived from the original on 26 December 2011. Retrieved 18 June 2011.
^ Pham, Hoang (8 April 2003). Handbook of reliability engineering. Birkhäuser. p. 514. ISBN 978-1-85233-453-6. Retrieved 21 July 2011.

[1] Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Archived from the original on 26 December 2011. Retrieved 18 June 2011.

[Pham2003-2] Pham, Hoang (8 April 2003). Handbook of reliability engineering. Birkhäuser. p. 514. ISBN 978-1-85233-453-6. Retrieved 21 July 2011.

[1]

[2]

See also

References