Language:enStatus: Standard
Term: mean duration of a customer interruption
Synonym1: customer average interruption duration index, CA US
Synonym2: CAIDI
Symbol: TI
Definition: sum of durations of all supply interruptions to individual customers during a time interval, divided by the number of these supply interruptions

Note 1 to entry: If tij is the duration of the ith interruption of supply to customer j and nj is the number of times customer j is affected during a time interval of duration T, then the mean duration of a customer interruption is given by

T I = i j t ij j n j MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbb a9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9 q8qiLsFr0=vr0=vr0db8meaabaGacmGadiWaaiWabaabaiaafaaake aacaWGubWaaSbaaSqaaiaabMeaaeqaaOGaeyypa0ZaaSaaaeaacqGH ris5daWgaaWcbaGaamyAaaqabaGccqGHris5daWgaaWcbaGaamOAaa qabaGccaWG0bWaaSbaaSqaaiaadMgacaWGQbaabeaaaOqaaiabggHi LpaaBaaaleaacaWGQbaabeaakiaad6gadaWgaaWcbaGaamOAaaqaba aaaaaa@49F1@

Note 2 to entry: 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: Mean duration of a customer interruption can be used to describe past performance or to estimate expected future performance.

Note 5 to entry: This measure is also equal to service unavailability per customer served divided by interruption frequency per customer served.

Note 6 to entry: This entry was numbered 191-27-05 in IEC 60050-191:1990.

Publication date:2017-12-15
Internal notes:
CO remarks:
TC/SC remarks:
VT remarks: