By Mohamed E. El-Hawary
This entire textbook introduces electric engineers to the main correct recommendations and strategies in electrical strength platforms engineering this present day. With an emphasis on functional motivations for selecting the easiest layout and research methods, the writer rigorously integrates idea and application.Key positive aspects contain greater than 500 illustrations and diagrams, sincerely constructed methods 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 historic evaluation of the advance of electrical energy structures. This ebook should be worthwhile to either strength engineering scholars strength engineers.
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Extra info for Electrical Power Systems: Design and Analysis (IEEE Press Series on Power Engineering)
This is drawn opposite phase a because at this instant both 1a and the EMF of the field E, (also caIJed excitation voltage) have their maximum value. The resultant magnetic field in the machine is denoted R and is obtained by graphically adding the F and A waves. Figure 3-8. Spatial MMF Waves in a Cylindrical Rotor Synchronous Generator. par Axis of phase a Figure 3-9. A Space Phasor Diagram for Armature Current In Phase with Excitation Voltage. S in usoid s can c onven ien tly be hand led usin g phasor method s.
The symbols commonly used for transfonner representation are given in Figure 2-14(a). The two-circle symbol is the symbol to be used on schematics for equipment having international usage according to lEe. Figure 2-14(b) shows symbols for a number of single-phase transfonners, and Figure 2-15 shows both single-line symbols and three-line symbols for three-phase transfonners. SOME SOLVED PROBLEMS Problem 2-A-1 In the circuit shown in Figure 2-16, the source phasor voltage is V = 30/150• Detennine the phasor currents 12 and 13 and the impedance Z2 ' Assume that 1\ is equal to five A.
C. Calculate the total active and reactive power supplied to the load. a --T-------� 220& � z = 10 /300 ohms c--------� b --------� Figure 2-11. 2. 3 Three-Phase Systems Solution A. The phase currents are obtained Ia = n I bn = I = en B. :a = 220[3 /-2100 C. 3 Repeat Example in a A connection. 4 2-12. 3. POWER SYSTEM REPRESENTATION A major portion of the modem power system utilizes three-phase ac circuits and devices. It is clear that a detailed representation of each of the three phases in the system is cumbersome and can also obscure infonnation about the system.