By Ken Budnick

ISBN-10: 007008856X

ISBN-13: 9780070088566

Publication through Budnick, Ken

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Sample text

The set of voltages Vab, Vbc' and Vca are called the l ine voltages, and the set of voltages Van' ViJn, and Y::n are referred to as the phase v oltages. 'l the required rela­ tionships. The effective values of the phase voltages are shown in Figure 2-8 Van' ViJn, and Y::n. as Each has the same magnitude, and each is displaced 1200 from the other two phasors. 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.

L the required rela­ tionships. The effective values of the phase voltages are shown in Figure 2-8 Van' ViJn, and Y::n. as Each has the same magnitude, and each is displaced 1200 from the other two phasors. 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.

The armature-reaction wave is shown as the sinusoid A in the figure. 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.