Explain whether all the motors rotate in the same direction when it is connected to the appropriate phase sequences (L1, L2, and L3) to their appropriate terminals on the motor (T1, T2, and T3).

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Please write all the formulas clearly for each case first, then solve the question by hand on paper and send a clear photo of the solution. Thanks a lot 6 A three-phase transistor voltage-source inverter supplies a three-phase load, as shown in Fig.8.41. The load consists of star connected resistance of 10 in each phase. The inverter supply voltage is 200V d.c. and each inverter switch conducts for 120°. (a) Sketch the switching signals for the six transistors. (b) Sketch the line-to-neutral voltage for one complete cycle of the output voltage. (c) Sketch the line-to-line voltage for one complete cycle of the output voltage. (d) Calculate the rms values of the first five harmonics in the line- to-line output voltage, including the fundamental. (e) Calculate the rms values of the first five harmonics in the line- to-neutral output voltage, including the fundamental. [Ans: (d) VL-L=244.95 V, (e) Vph = 141.42 V] Q1 Q3 Q5 Vdc 200V b Q4 Q6 Q2 Fig.8.41. 120° conuction ww 102 w 1052 ww n 1052

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Chapter 48, Problem 15SQ

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Explain whether all the motors rotate in the same direction when it is connected to the appropriate phase sequences (L1, L2, and L3) to their appropriate terminals on the motor (T1, T2, and T3).

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Please write all the formulas clearly for each case first, then solve the question by hand on paper and send a clear photo of the solution. Thanks a lot 6 A three-phase transistor voltage-source inverter supplies a three-phase load, as shown in Fig.8.41. The load consists of star connected resistance of 10 in each phase. The inverter supply voltage is 200V d.c. and each inverter switch conducts for 120°. (a) Sketch the switching signals for the six transistors. (b) Sketch the line-to-neutral voltage for one complete cycle of the output voltage. (c) Sketch the line-to-line voltage for one complete cycle of the output voltage. (d) Calculate the rms values of the first five harmonics in the line- to-line output voltage, including the fundamental. (e) Calculate the rms values of the first five harmonics in the line- to-neutral output voltage, including the fundamental. [Ans: (d) VL-L=244.95 V, (e) Vph = 141.42 V] Q1 Q3 Q5 Vdc 200V b Q4 Q6 Q2 Fig.8.41. 120° conuction ww 102 w 1052 ww n 1052

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Please write all the formulas clearly for each case first, then solve the question by hand on paper and send a clear photo of the solution. Thanks a lot A three-phase bridge-inverter is fed from a d.c. source of 200 V. If the load is star-connected of 10 02/phase pure resistance, determine the RMS load current, the required RMS current rating of the thyristors and the load power for (i) 120° firing, and (ii) 180° firing. [Ans (i) 120° firing IL (rms) = 8.16 A, IT(rms) = 9.8 A. Load power = 2000 W. (ii) 180° firing IL (rms) = 9.43 A, IT (rms) = 6.67 A. Load power = 2667 W.]