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II.2. Momentary Outage Causes <br />The ability to track momentary outages can be difficult or unavailable on some systems, but due to the <br />hazard they pose for electronic equipment, it is important to track and analyze momentary causes. In this <br />section, we evaluate common causes of momentary outages for your utility, region and customer size <br />class as well as common causes for all utilities that use the eReliability Tracker. Please note that only <br />outages lasting less than five minutes are classified as momentary, as defined by IEEE 1366. <br />0.160.15 <br />0.14 <br />0.12 <br />0.12 <br />0.1 <br />0.08 <br />0.050.05 <br />0.06 <br />0.04 <br />Occurrence Rates <br />0.02 <br />0.002 <br />0 <br />UnknownUtility Maintenance Equipment EquipmentStorm <br />TreesHumanWeatherSquirrelUnknown <br />and RepairsReplacement <br />Outage Cause Types <br />Figure 11. Top five customer-weighted occurrence rates for common causes of momentary <br />Ў <br />outages for all utilities that use the eReliability Tracker Service <br />0.2 <br />0.19 <br />0.15 <br />0.1 <br />0.05 <br />Occurrence Rates <br />0000 <br />0 <br />NoneNoneNone <br />SquirrelTreesNoneHumanWeatherSquirrelUnknown <br />Outage Cause Types <br />ЎͲ Џ <br />Figure 12. Top five customer-weighted causes of momentary outages for your utility <br />6 If your utility has less than eight momentary outages recorded in the eReliability Tracker, this graph will be blank. <br />14 <br />68 <br />