Aging power delivery infrastructures by H Lee Willis; Randall R Schrieber; Gregory V Welch

By H Lee Willis; Randall R Schrieber; Gregory V Welch

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Willis and W. G. Scott, Marcel Dekker, 2000. Copyright © 2001 by Taylor & Francis Group, LLC 39 Power Delivery Systems 2011 WINTER PEAK 3442 MW N Ten miles Shading indicates relative load density. Lines show major roads and highways. 1 Map of electrical demand for a major US city shows where the total demand of more than 2,000 MW peak is located. Degree of shading indicates electric load distribution. The T&D system must cover the region with sufficient capacity at every location to meet the consumer needs there.

That electrical path must be reliable, too, so that it provides an uninterrupted flow of stable power to the utility's consumers. Reliable power delivery means delivering all of the power demanded not just some of the power needed, and doing so all of the time. Anything less than near perfection in meeting this goal is considered unacceptable. 9% reliability of service may sound impressive, it means nearly nine hours of electric service interruption each year, an amount that would be unacceptable in nearly any first-world country.

Being close to the consumers, distributed generation does not carry with it the costs of adding T&D facilities to move the power from generation site to consumer. Often this is the margin of difference, as will be discussed later in this book. 2. As power is moved from generation (large bulk sources) to consumer (small demand amounts) it is first moved in bulk quantity at high voltage - this makes particular sense since there is usually a large bulk amount of power to be moved out of a large generating plant.

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