By H Lee Willis; Randall R Schrieber; Gregory V Welch
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Additional info for Aging power delivery infrastructures
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.
Rocket science The rather significant improvement in effectiveness that is possible by revising guidelines and adopting newer engineering methods at the primary distribution level brings up a key point about why the industry clung to what are essentially outdated engineering practices for so long. Distribution planning and engineering at most utilities is kept at a rather low level. Engineering of a distribution system so that it performs the basic electrical functions that were traditionally required of it is rather straightforward.
Such stable voltage can be difficult to obtain, because the voltage at the consumer end of a T&D system varies inversely with electric demand, falling as the demand increases, rising as it decreases. If this range of load fluctuation is too great, or if it happens too often, the consumers may consider it poor service. Thus, a T&D system's mission is to: 1. Cover the service territory, reaching all consumers 2. Have sufficient capacity to meet the peak demands of its consumers 3. Provide highly reliable delivery to its consumers 4.
Aging power delivery infrastructures by H Lee Willis; Randall R Schrieber; Gregory V Welch