K i.=in T₁ De ib T₂ i。 T₁ Load FIGURE P10.18 10.19 The three-phase half-wave converter in Figure P10.18 is operated from a three-phase Y-connected 220-V, 60-Hz supply and a freewheeling diode is connected across the load. The load current with an average value of I, is continuous and the ripple content is negligible. If the delay angle a = /3, calculate (a) the harmonic factor of input current, (b) the displacement factor, and (e) the input power factor. 10.20 The three-phase half-wave converter in Figure P10.18 is operated from a three-phase Y-connected 220-V, 60-Hz supply and the load resistance is R=50. If the average out- put voltage is 25% of the maximum possible average output voltage, calculate (a) the delay angle, (b) the rms and average output curren's, (e) the average and rms thyristor currents, (d) the rectification efficiency, (e) the transformer utilization factor, and (f) the input power factor. 5 mH. 10.21 The three-phase half-wave converter in Figure P10.18 is operated from a three-phase Y-connected 220-V. 60-Hz supply and a freewheeling diode is connected across the load. The load consists of series-connected resistance R = 102, inductance L = and battery voltage E 20 V. (a) Express the instantaneous output voltage in a Fourier series, and (b) determine the rms value of the lowest order harmonic on the output current. Assume a = 6 10.22 A three-phase semiconverter in Figure P10.22 is operated from a three-phase Y-connected 208-V. 60-Hz supply and the load resistance is R = 102. If it is required to obtain an average output voltage of 50% of the maximum possible output voltage, calculate (a) the delay angle a. (b) the rms and average output currents, (c) the average and rms thyristor currents, (d) the rectification efficiency. (e) the TUF, and (f) the input PF.