Laserfiche WebLink
2004 2005 <br />Types of <br />Faults # of <br />Faults % Customer <br />Minutes <br />% # of <br />Faults <br />% Customer <br />Minutes <br />U.G. Faults 13 15.5 47,345 12.1 9 15.5 8,900 1.6 <br />Dig-Ins 2 2.4 7,935 2 3 5.2 1,820 .3 <br />Termination <br />Failure <br />0 <br />0 <br />0 <br />0 <br />1 <br />1.7 <br />480 <br />.1 <br />Transformer <br />Failure <br />1 <br />1.2 <br />120 <br />.l <br />4 <br />6.9 <br />1,650 <br />.3 <br />Fuse Failure 9 10.7 2,245 .6 4 6.9 3,525 .6 <br />Connector 6 7.2 755 .2 4 6.9 340 .1 <br />Branches 17 20.2 11,655 3 3 5.2 1620 .3 <br />Animal 17 20.2 10,695 2.7 14 24.1 3,410 .6 <br />Transformer <br />Failure <br />2 <br />2.4 <br />555 <br />.1 <br />0 <br />0 <br />0 <br />0 <br />Lighting <br />Arrestor <br />1 <br />1.2 <br />3,000 <br />.7 <br />0 <br />0 <br />0 <br />0 <br />Weather 7 8.3 101,560 25.8 8 13.8 423,980 76.0 <br />Vehicle Hit <br />Pole <br />9 <br />10.7 <br />207,431 <br />52.7 <br />6 <br />10.3 <br />107,715 <br />19.3 <br />Wholesale <br />Supplier <br />0 <br />0 <br />0 <br />0 <br />2 <br />3.5 <br />4,700 <br />.8 <br /> <br /> 84 100 393,296 100 58 100 558,140 100 <br />The above table reflects no alarming trends or patterns. Weather and vehicles hitting <br />poles account for over 95% of customer minute outages. "The number of branch outages <br />is down this year which indicates our tree trimming efforts are paying off. The number <br />of outages actually decreases regardless of our system growth. <br />A number of reliability indexes are evolving in the electric industry to make it easier to <br />compare performance of electrical utilities. These reliability indexes are: <br />1. ASAI (average service availability index) <br />ASAI is a measure of the average availability of the sub-transmission and distribution <br />systems to serve customers. It is the ratio of the total customer minutes that service was <br />available to the total customer minutes demanded in a time period. It is normally <br />expressed as a percentage. <br />ERMU's 2005 ASAI is 99.87%. This is a very good percentage for any utility. <br />2. CAIDI (customer average interruption duration index) <br />This is defined as the average length of an interruption, weighted by the number of <br />customers affected, for customers interrupted during a specific time period. 1t is <br />calculated by summing the customer minutes off during each interruption in the time <br />period and dividing this sum by the number of customers experiencing one or more <br />