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Aging Power Delivery Infrastructures, 2nd Edition by Randall R. Schrieber, H. Lee Willis

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4 Power System Reliability and Reliability of Service

4.1 INTRODUCTION

“Reliability” as normally applied by power distribution-utilities means continuity of service to the electric consumers. A 100% reliable power system provides power without interruption, power that is available all of the time regardless of how much and if the consumer is using it at any given moment. Almost anything less than perfection in this regard will garner complaints that the power supply is

“unreliable.” An availability of 99.9% might sound impressive, but it means eight and three quarter hours without electric service each year, nearly all electric consumers in North America would consider that a level of service unsatisfactory. That is why availability averages ...

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