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IEVref:692-08-01ID:
Language:enStatus: Standard
Term: interruption frequency per customer served
Synonym1: system average interruption frequency index, CA US
[Preferred]
Synonym2: SAIFI
[Admitted]
Synonym3:
Symbol: fCS
Definition: number of interruptions of supply to individual customers during a given time interval, divided by the product of the total number of customers and the duration of that time interval

Note 1 to entry: If the power supply to customer j is interrupted nj times during a time interval of duration T, and the total number of customers served is NS, then interruption frequency per customer served is given by

f CS = j n j N S T MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbb a9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9 q8qiLsFr0=vr0=vr0db8meaabaGacmGadiWaaiWabaabaiaafaaake aacaWGMbWaaSbaaSqaaiaaboeacaqGtbaabeaakiabg2da9maalaaa baGaeyyeIu+aaSbaaSqaaiaadQgaaeqaaOGaamOBamaaBaaaleaaca WGQbaabeaaaOqaaiaad6eadaWgaaWcbaGaae4uaaqabaGccaWGubaa aaaa@44F8@

Note 2 to entry: Usually, only sustained interruptions are considered.

Note 3 to entry: The term "customer" represents the end user and not some intermediate distribution system or company.

Note 4 to entry: Interruption frequency per customer served can be used to describe past performance or to estimate expected future performance.

Note 5 to entry: This entry was numbered 191-27-01 in IEC 60050-191:1990.


Publication date:2017-12-15
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