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# Electrical power drives et3026 wb lecture2-1

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### Electrical power drives et3026 wb lecture2-1

1. 1. February 22, 2013 1 Elektrische Aandrijvingen WTB Lokatie/evenement P.BAUER
2. 2. February 22, 2013 2 FIGURE 2-1 Dry cell. FIGURE 2-2 Electron flow. FIGURE 2-3 Conventional current flow. FIGURE 2-4 Distinction between a source and a load. Introduction
3. 3. February 22, 2013 3 FIGURE 2-9 Solution of Example 2-1. FIGURE 2-6 If E21 = -100 V, terminal 2 is negative with respect to terminal 1. FIGURE 2-7 Sign notation to designate a voltage. FIGURE 2-8 Circuit of Example 2-1. Sign notation
4. 4. February 22, 2013 4 FIGURE 2-10 Graph of an alternating voltage having a peak of 100 V. Alternating Voltage
5. 5. February 22, 2013 5 FIGURE 2-12 Circuit element showing positive direction of current flow. Positive and Negative currents FIGURE 2-13 Electric circuit and the corresponding graph of current. The arrow indicates the positive direction of current flow.
6. 6. February 22, 2013 6 FIGURE 2-14 Sinusoidal voltage having a peak value of 100 V and expressed by eab = Em cos (360 ft + 30º). e= Em cos(2 Π ft+ Φ)
7. 7. February 22, 2013 7 FIGURE 2-16 Graph showing the instantaneous values of voltage and current. The current lags 30º behind the voltage. The effective voltage is 240 V and the effective current is 10 A.
8. 8. February 22, 2013 8 FIGURE 2-17 The current phasor I and voltage phasor E are in phase. FIGURE 2-18 Phasor I lags behind phasor E by an angle of θ degrees. FIGURE 2-19 Phasor I leads phasor E by β degrees. But phasor I also lags E by θ degrees. Phasor representation
9. 9. February 22, 2013 9 FIGURE 2-22 Phasor diagram of the voltage and current given in Fig. 2.16.
10. 10. February 22, 2013 10 FIGURE 2-23 This severely distorted 60 Hz current obtained on an electronic drive contains the following harmonics: fundamental (60 Hz) = 59 A; fifth harmonic (300 Hz) = 15.6 A; seventh harmonic (420 Hz) = 10.3 A. Higher harmonics are also present, but their amplitudes are small. (Courtesy of Electro-Mécanik.) Harmonics
11. 11. February 22, 2013 11 FIGURE 2-24 a. Two sinusoidal sources having different frequencies connected in series. b. A fundamental and third harmonic voltage can together produce a flat-topped wave.