By H. Lee Willis
ISBN-10: 0585157545
ISBN-13: 9780585157542
ISBN-10: 0824700988
ISBN-13: 9780824700980
Surveys the sphere of electrical software distribution method making plans in addition to inner interactions. The textual content info approaches and strategies for specification, format, making plans economics and scheduling, and demonstrates tips to meet shopper calls for in a good and competitively priced demeanour. It offers instructions and recommends the main practical ways to constructing and bettering electric distribution platforms.
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Sample text
Often, portions of the transmission system -- bulk power delivery lines, lines designed at least in part for stability as well as power delivery needs -- do this too, and the distinction between transmission and sub-transmission lines becomes rather blurred. 5 kV to as high as 230 kV. With occasional exceptions, sub-transmission lines are part of a network grid -- they are part of a system in which there is more than one route between any two points. 5 The Substation Level Substations, the meeting point between the transmission grid and the distribution feeder system, are where a fundamental change takes place within most T&D systems.
These main branches end at open points where the feeder meets the ends of other feeders -- points at which a normally open switch serves as an emergency tie between two feeders. 6 Distribution feeders route power away from the substation, as shown (in idealized form -- configuration is never so evenly symmetric in the real world) for two substations. Positions of switches make the system electrically radial, while parts of it are physically a network. Shown here are two substations, each with four feeders.
The transmission and sub-transmission systems above the substation level usually form a network, as discussed above, with more than one power flow path between any two parts. But from the substation on to the customer, arranging a network configuration would simply be prohibitively expensive. Thus, most distribution systems are radial -- there is only one path through the other levels of the system. Typically, a substation occupies an acre or more of land, on which the various necessary substation equipment is located.
Power Distribution Planning Reference Book (Power Engineering, Vol 1) by H. Lee Willis
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