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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The 120/240 volt single-phase utilization voltage used in the United States, or even the 250 volt/416 volt three-phase used in "European systems" is not equal to the task of economically moving power more than a few hundred yards. The application of these lower Copyright © 2001 by Taylor & Francis Group, LLC Power Delivery Systems 41 voltages for anything more than very local distribution at the neighborhood level results in unacceptably high electrical losses and high costs. 4. It is costly to change voltage level - not prohibitively so, for it is done throughout a power system (that's what transformers do) - but voltage transformation is a major expense, which does nothing to move the power any distance in and of itself.

It is costly to change voltage level - not prohibitively so, for it is done throughout a power system (that's what transformers do) - but voltage transformation is a major expense, which does nothing to move the power any distance in and of itself. 5. Power is more economical to produce in very large amounts. There is a significant economy of scale in generation, notwithstanding the claims by advocates of modern distributed generators. Large generators produce power more economically than small ones.

47kV-distribution transformer. 47 kV (the primary distribution voltage) the 40 MW is split into six parts, each about 7 MW, with each 7 MVA part routed onto a different distribution feeder. Mrs. Rose's power flows along one particular feeder for two miles, until it gets to within a few hundred feet of her home. Here, a much smaller amount of power, 50 kVA (sufficient for perhaps ten homes), is routed to a service transformer, one of several hundred scattered up and down the length of the feeder.

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