Aging power delivery infrastructures by Willis, H. Lee; Schrieber, Randall R

By Willis, H. Lee; Schrieber, Randall R

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The result is that interruptions, when they do occur, are difficult to restore, involving more load transfers, more emergency measures, and taking more time. While this does not increase the number of consumer interruptions to any large degree, it tends to increase the average duration of interruptions that do occur. At some point, SAIDI increases − the number of interruptions has gone up (due to age and the accelerated aging cited above) and now the length of interruptions goes up due to this reason.

Equipment failure causes lower customer service quality. Customers are more likely to have interruptions of their electrical service due to the unexpected failures of this older equipment. 1 1b. Higher repair and restoration efforts. More failures mean more and more unpredicted events requiring emergency or contingency 1 SAIFI, System Average Interruption Frequency Index, the average number of interruptions of service experienced annually per customer. For a discussion of this and other reliability-related indices, see Chapter 4.

The result is that interruptions, when they do occur, are difficult to restore, involving more load transfers, more emergency measures, and taking more time. While this does not increase the number of consumer interruptions to any large degree, it tends to increase the average duration of interruptions that do occur. At some point, SAIDI increases − the number of interruptions has gone up (due to age and the accelerated aging cited above) and now the length of interruptions goes up due to this reason.

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