Jump to content

Talk:SAIFI

Page contents not supported in other languages.
From Wikipedia, the free encyclopedia

I don't think the units are right here. The numerator has units of "outages" while the denominator is measured in "customers." How does outage/customer equate to hours? Can someone with a copy of the standard please check this out?


Please confirm for me if SAIFI = Number of Interruptions / Number of Customer Served

or SAIFI = Number of Customer Interrupted / Number of Customer Served

Research on December 1, 2010: SAIFI refers to the frequency of interruption, not duration, so it never comes out to hours. The index answers the question "how many times did we interrupt power to any given customer (in a given period of time - usually one year)". See SAIDI or CAIDI for duration (hours). From a utility perspective, the "number of customers served" is really the number of "service points" (meters) served, not the number of customers. A "customer" (example: xyz company or John Doe with a primary and secondary residence) may have many meters over a broad geographic area.

Regarding the reference, the wording in the article is almost an exact match to http://collaborate.nist.gov/twiki-sggrid/pub/SmartGrid/CSCTGHighLevelRequirements/Power_System_Reliability_Indices.doc, but this document is not authoritative, and does not itself provide a reference. What you really need for a reference is the governmental or industry standard that originally defined the measurement. If appears that the IEEE standard applies, but you must be a member or be willing to pay in order to see the actual standard. Here is the best citation that I could find: IEEE Std 1366-2003, IEEE guide for electric power distribution reliability indices, Transmission and Distribution Committee, IEEE Power Engineering Society, USA, 2004. It would be helpful if a member of IEEE could validate the citation.

ElecUtilityITappsTD (talk) 18:05, 1 December 2010 (UTC)[reply]

Clarification: SAIFI is based on the number of interruptions not the number of customers. If a given customer (meter) looses power 3 times in a year, all three interuptions are counted. The "S" means system, so the denominator is the number of customers (actually, meters) served, not the number who lost power.

ElecUtilityITappsTD (talk) 18:18, 1 December 2010 (UTC)[reply]

[edit]

Hello fellow Wikipedians,

I have just modified one external link on SAIFI. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

  • If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
  • If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 09:55, 25 January 2018 (UTC)[reply]

[edit]

See discussion on Talk:SAIDI#Navigation template. --Викидим (talk) 00:38, 17 April 2022 (UTC)[reply]