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. http://www.ee.iastate.edu/~jdm/ee653/DistributionReliabilityPredictive.ppt. Retrieved 18 June 2011. 
  2. ^ Pham, Hoang (8 April 2003). Handbook of reliability engineering. Birkhäuser. pp. 514. ISBN 9781852334536. http://books.google.com/books?id=Xe6Z4wKQFMoC&pg=PA514. Retrieved 21 July 2011. 

See also