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The System Average Interruption Frequency Index (SAIFI)[1] is commonly used as a reliability indicator by electric power utilities. SAIFI is the average number of interruptions that a customer would experience, and is calculated as

\mbox{SAIFI} = \frac{\sum{\lambda_i N_i}}{N_T}

where \lambda_i is the failure rate, N_i is the number of customers for location i and N_T is the total number of customers served. In other words,

\mbox{SAIFI} = \frac{\mbox{total number of customer interruptions}}{\mbox{total number of customers served}}

SAIFI is measured in units of interruptions per customer. It is usually measured over the course of a year, and according to IEEE Standard 1366-1998 the median value for North American utilities is approximately 1.10 interruptions per customer.

References[edit]

  1. ^ Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Retrieved 18 June 2011. 

See also[edit]


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Yahoo!7 News

Yahoo!7 News
Fri, 25 Jul 2014 23:00:00 -0700

Shairazuddin Saifi was working at the National Museum in Kabul when the fighting among local groups intensified in the late 1980s. He grew increasingly concerned the museum would be looted or destroyed during the violent civil war. "We knew it was not ...
 
Calcutta Telegraph
Fri, 25 Jul 2014 14:22:30 -0700

New Delhi, July 25: Shabnam Saifi was thrilled when, aged 23, she was selected for a PhD programme at a leading research laboratory that promised a stipend she believed would end her dependence on her parents for day-to-day expenses. Now 25, Saifi ...

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Tue, 22 Jul 2014 22:48:45 -0700

Israel has now destroyed or seriously damaged more than 50 mosques since its assault on Gaza began, according to undersecretary of the Ministry of Endowments in Gaza, Hassan al-Saifi. Israel has now destroyed or seriously damaged more than 50 ...
 
Arab Times Kuwait English Daily
Wed, 23 Jul 2014 17:45:00 -0700

In the same context, Al-Ajman Tribe held a meeting on Monday evening in the presence of the tribe prince Sheikh Sultan Salman bin Hathleen, Dr Mohammad Al-Huwaila, former MPs Abdullah Al-Barghash, Al-Saifi Mubarak Al-Saifi and other dignitaries from ...
 
Scoop.co.nz (press release)
Thu, 24 Jul 2014 22:37:30 -0700

“Unison's network performance, as measured by SAIFI and SAIDI reported that, on average, customers experienced 1.77 outages over the twelve month period, with outages restored on average within 112.82 minutes. This is well below the targets set by the ...
 
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Fri, 25 Jul 2014 16:15:00 -0700

Chairman LCCI Halal Food Export Committee Naseeb Ahmad Saifi said that perishable Halal Food Industry has already been suffering due to energy shortages. By keeping the export-related government offices closed for such a long period, the government ...

The Daily Star

The Daily Star
Wed, 23 Jul 2014 14:21:41 -0700

At Saifi yoga studio NOK Yoga Shala, for example, some members have been doing light stretching and classes even while fasting, as a way to stay moderately active, said director Maria Pamoukian. “Part of the concept of Ramadan is about rest. It's about ...
 
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Tue, 22 Jul 2014 00:07:30 -0700

And with hammer, we've got a fast circle and the world record-holder” in Qatar's Ashraf Amjad Al-Saifi. Besides Bromell in the 100, there are just a few American favorites this week, and they almost all seem to be in the sprints. Florida State-bound ...
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