By Mohamed E. El-Hawary
ISBN-10: 078031140X
ISBN-13: 9780780311404
This entire textbook introduces electric engineers to the main correct techniques and strategies in electrical strength structures engineering at the present time. With an emphasis on functional motivations for selecting the easiest layout and research techniques, the writer rigorously integrates thought and application.Key good points contain greater than 500 illustrations and diagrams, in actual fact built techniques and alertness examples, very important mathematical information, assurance of either alternating and direct present, an extra set of solved difficulties on the finish of every bankruptcy, and an old evaluate of the advance of electrical energy structures. This booklet should be beneficial to either strength engineering scholars energy engineers.
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Extra resources for Electrical Power Systems: Design and Analysis (IEEE Press Series on Power Engineering)
Example text
10) a to b is equal to the plus the voltage from n to b. Thus Eq. ::L Figure 2-8. illustrating the Phase and Magnitude Relations Between the Phase and Line Voltage of a Y Connection. where � denotes the effective magnitude of the phase voltage. 15) Substituting Eqs. 1 4) in Eq. 18) The expressions obtained above for the line voltages show that they constitute a balanced three-phase voltage system whose magnitudes are 13 23 24 Some Basic Principles times the phase voltages. 19) A current flowing out of a line tenninal a (or b or c) is the same as that flowing through the phase source voltage appearing between tenninals n and a (or n and b, or n and c).
The one-line diagram summarizes the relevant infonnation about the system for the particular problem studied. For example, relays and circuit breakers are not important when dealing with a nonnal state problem. However, when fault conditions are considered, the location of relays and circuit breakers is important and is thus included in the single-line diagram. The International Electrotechnical Commission (IEC), the American National Standards Institute (ANSI), and the Institute of Electrical and 31 Basic lEe 0 Generator lEe II (general) 0 OR 8 Generator, direct - current lEe (i) Generator, alternating - current lEe (i) Generator, synchronous Motor lEe fl (general l 1- phase 2 - phase o 3 - phase wye (ungrounded) 3-phase wye (grounded) 3-phase delta 0 OR 6-phas e diametric al 9 Motor, direct-current lEe 6 -phase double -delta G) Motor, alternating - current lEe G) (8) Motor, synchronous lEe @ CAl Figure 2-13.
The armature-reaction EMF for this machine is related to the armature current by A ssume that the generated EMF is related to field current by E,= 251, A . C ompute the field current r equired to establish r ated voltage acr oss the terminals of a unity power factor load that draws rated generator armature cur rent. B. 8 PF laggi ng. 02 V With reference to the equi valen t ci rcui t of Fi gure 3-12, we have A. 5696A B.
Electrical Power Systems: Design and Analysis (IEEE Press Series on Power Engineering) by Mohamed E. El-Hawary
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