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Transmission and Distribution: a Textbook
The electrical energy is normally generated at the power stations far away from the urban areas where consumers are located. The problems, therefore, is to transmit the large blocks of power over long distances economically. In this volume of the book will deal with the type of equipment, techniques and problems involved in transmitting large blocks of power over long distances from the generating stations to the load centres.rnThe electrical supply systems may be compared to a tree, the roots of which represent the generating equipment, supplying nourishment to all parts of the tree. The trunk of the tree, which carries all the sap of life of the tree, represents the primary transmission line carrying electricity from the generating station to the various substations in different parts of branch and leaf representing a customer of group of customers.rnThere is a large network of conductors between the generating stations and the consumers. The network is called the transmission and distribution system. The transmission system is to deliver bulk power from power stations to the load centres and large industrial consumers beyond the economical service range of the regular primary distribution lines where as distribution system is to deliver power from power stations of substations to the various consumers.rnAlthough electrical power can be transmitted and distributed by either a.c. or d.d., but in practice 3-phase 3-wire a.c. system is universally adopted for transmission of large blocks of power and 3-phase 4-wire a.c. system is usually adopted for distribution of electrical power.rn
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