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A Course in Electrical Power

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The electric energy is normally generated at the power stations far away from the urban areas where consumers are located. The problem, therefore is to transmit the large blocks of power over long distance 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 distance from the generating stations to the load centres. The 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 or life of the tree, represents the primary transmission line carrying electricity from the generating station to the various substations in different parts of the system. The branches represent the distributing system conducting electricity to each samll branch and leaf representing a customer or group of customers.rnBoth the historical and the present day civilization of mankind are closely interwoven with energy, and there is no reason to doubt but that in the future our existence will be more and more dependent upon the energy. Electrical energy occupies the top position in the energy hierarchy. It finds innumerable uses in home, industry, agriculture and even in transport. Besides its use for domestic, commercial and industrial purposes it is required for increasing defence and agricultural production. In agriculture, it is used for pumping water for irrigation and for improving the methodsof production and numerous other operations. Electrical energy is a convenient form of energy because it can be generated centrally in bulk and transmitted economically over long distance and is almost pollution free at the consumer level. Further, it can be adopted conveniently in the domestic, industrial andagriculture and improvement in the quality of life of the people depend so much upon the supply of electrical energy that the annual per capita consumption of electrical energy has emerged these days as an accepted yardstick to measure the prosperity of a nation. Some of the advanced and developed nations of North America and Europe have a very high annual per capita consumption of electrical, say from 8 to 11 thousand kwh, while in most of Africa, Asia and Latin America it is too low to be considered. rnIn all engineering works, the question of cost is of first importance. In most cases the cost decides whether a certain project will be carried out or not, although political and other considerations may intervene sometimes. The electrical power supplier is required to supply power to a large number of consumers (whenever apply for it) to meet their requirements. While designing electrical power generating stations and other systems efforts are made to achieve overall economy so that the per unit cost of generations is the lowest possible. This will enable the supplier to supply electrical energy to its consumers at reasonable rates. The problem of determining the cost of any scheme is often difficult because the cost varies considerably with time, tariff conditions and even with convention. The schemes involving the use of aluminium, which used to be considered very expensive a century ago, are now considered to be cheap due to lower cost. Economic problem occurs in the fields of generation, transmission, distribution and utilization of electrical power. The electrical engineer has to adopt the cheapest and most convenient scheme after having study of the relative costs of the possible schemes. rnAct of drawing or state of being drawn: propulsion of vehicle is called the traction and the system of traction involving the use of electricity is called the electric traction system. There are various systems of traction prevailing such as steam engine drive, internal combustion engine drive, diesel electric drive, battery electric drive, electric drive. These systemof traction may be classified broadly into two groups namely (i) the traction systems which do not involve the use of electricity at any stage and called the non electric traction systems such as steam engine drive, internal combustion engine drive etc. (ii) the traction systems which involve the use of electricity at some stage or the other, and called the electric traction systems such as diesel electric drive, electric drive, etc. Systems of electric traction may further be subdivided into two main groups: (i) the group consisting of vehicles which receive electric power from a distributing network fed at suitable points from either a central power station or substations suitably spaced such as tramways, trolley buses, electric railways etc. (ii) the group consisting of self contained locomotives such as diesel electric trains and ships, petrol electric trucks and lorries, battery driven road vehichles etc.rn

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Ketersediaan

090101145

Tersedia

Informasi Detil

Judul Seri

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No. Panggil

621.31 GUP c

Penerbit

S.S. Mubaruk & Brothers Pte Ltd : Singapore., 1996

Deskripsi Fisik

152 p.

Bahasa

English

ISBN/ISSN

-

Klasifikasi

621.31 GUP c

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

10th Edition

Subyek

Electric Apparatus and Appliances Installation

Info Detil Spesifik

-

Pernyataan Tanggungjawab

-

Versi lain/terkait

Lampiran Berkas

Komentar

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