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The 'Performance indicators for outages and disturbances' report is an Operator report that produces some of the most important key figures that are used when you want to quantify operational reliability in networks based on outages / disruptions that have occurred. The report is based on the customer points (delivery points / centrals etc.) and based on these subscriptions, the key figures for the period chosen are calculated.
The report can be used for internal and external benchmarking by comparing key figures for outages/ disruptions for a certain period with those for another period or those for another company. You can also use the key figures to communicate about the network's operational reliability to customers and other stakeholders, "During year X, our network had an availability of 99.6%".
In further text, outages and disturbance are used synonymously.
-From date states from which date outages should be included
-To date states until which date outages should be included
-Type states the type of outage to be included
Refers to the total number of subscriptions in the network at the time the report is run.In order to be included, the subscription in question must be at an operational stage. The value for Total number of subscriptions is used as a denominator, since several of the key figures described below are calculated.
Specifies the total outage time for the subscriptions available in the network. If you have 5 subscriptions each involved in 3 outages every 3 minutes, the total outage time will correspond to 45 minutes.
Specifies the total number of subscriptions affected by an outage during the period. The value can be as large as Total number of subscriptions. If the values for Total number of subscriptions and Number of affected subscriptions are equal, all subscriptions in the network have been affected by an outage during the period chosen.
Calculates the total number of subscription outages that occurred during the period. If you have 5 subscriptions each having 3 outages during the period, the value will correspond to 15.
SAIFI stands for System Average Interruption Frequency Index and is a key figure that indicates how many outages you have on average on each included point in the network. The value is obtained by dividing the Number of subscription outages by Total number of subscriptions. If the value corresponds to 0.25, this means that each individual subscription in the network had on average 0.25 interruptions during the selected period.
SAIDI stands for System Average Interruption Duration Index indicates an average of how long each individual point has been affected by an outage during a selected period. The value is obtained by dividing Total outage time by Total number of subscriptions. If the value for a selected period corresponds to 10, this means that each subscription has on average had a total outage time of 10 minutes during the selected period.
CAIFI stands for Customer Average Interruption Frequency Index and is a key figure that indicates an average of how many outages the customers suffered from at least one outage had. The value is obtained by dividing Number of subscription outages by Number of affected subscriptions. Since one only includes subscriptions that are affected by outages in the denominator and The number of affected subscriptions is always less than or equal to Number of subscription outages, the value for the key figure will always be greater than 1.
CAIDI stands for Customer Average Interruption Duration Index och It is a key figure that indicates an average of how long each outage has occurred. The value is obtained by dividing Total outage time by ‘Number of subscription outages’.
ASAI stands for Average Service Availability Index and indicates how big a part of a period the system has been available. The value is obtained by multiplying the Total number of subscriptions by total time during the period, subtracting Total outage time and then dividing by the time during the period. If all facilities had outages during the entire examination period, the value of the key figure would have become zero (no availability), if one did not have one single outage during the period, the value would have been 1 (100% availability).