ASAI

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

  1. ↑ Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Retrieved 18 June 2011.
  2. ↑ Pham, Hoang (8 April 2003). Handbook of reliability engineering. Birkhäuser. p. 514. ISBN 978-1-85233-453-6. Retrieved 21 July 2011.

See also