MAIFI
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The Momentary Average Interruption Frequency Index is a reliability indicator used by electric power utilities. MAIFI is the average number of sub-5-minute (i.e. "momentary") interruptions that a customer would experience during a given period (typically a year), and is calculated as
MAIFI has tended to be less reported than other reliability indicators, such as SAIDI, SAIFI, and CAIDI. However, MAIFI is useful for tracking momentary power outages, or "blinks," that can be hidden or misrepresented by an overall outage duration index like SAIDI or SAIFI.
Momentary power outages are often caused by transient faults, such as lightning strikes or vegetation contacting a power line, and many utilities use reclosers to automatically restore power quickly after a transient fault has cleared.
