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Reliability index is an attempt to quantitatively assess the reliability of a system using a single numerical value. [1] The set of reliability indices varies depending on the field of engineering, multiple different indices may be used to characterize a single system.
The Customer Average Interruption Duration Index (CAIDI) is a reliability index commonly used by electric power utilities. [1] It is related to SAIDI and SAIFI, and is calculated as
The Momentary Average Interruption Frequency Index (MAIFI) [1] is a reliability index used by electric power utilities.MAIFI is the average number of momentary interruptions that a customer would experience during a given period (typically a year).
The System Average Interruption Duration Index (SAIDI) [1] is commonly used as a reliability index by electric power utilities. SAIDI is the average cumulative outage duration for each customer served, and is calculated as:
The Mil-HDBK-217 reliability calculator manual in combination with RelCalc software (or other comparable tool) enables MTBF reliability rates to be predicted based on design. A concept which is closely related to MTBF, and is important in the computations involving MTBF, is the mean down time (MDT). MDT can be defined as mean time which the ...
The System Average Interruption Frequency Index (SAIFI) is commonly used as a reliability index by electric power utilities. SAIFI is the average number of interruptions that a customer would experience, and is calculated as
The Average Service Availability Index (ASAI) [1] [2] is a reliability index commonly used by electric power utilities.ASAI is calculated as = where is the number of customers and is the annual outage time (in hours) for location .
The method is also known as the Hasofer-Lind Reliability Index, developed by Professor Michael Hasofer and Professor Niels Lind in 1974. [ 3 ] [ 4 ] The index has been recognized as an important step towards the development of contemporary methods to effectively and accurately estimate structural safety.