You are the only licensed, qualified and well-respected staff electrical engineer in a troy, ny. the city of troy is supplied by a 2,400-v 60hz single-phase distribution line. the available distribution and secondary voltage levels within the municipality are: 120 v, 240 v, 480 v, and 2,400 v, all provided by 2,400-v transformer(s) (as needed) at the "business end" of the distribution line.
your job is to specify a new rectifier for the street tramway system. the rectifier must be connected to the available ac system. the rectifier supplies the tramway system through a feeder, whose resistance is 1.1 ω.
you decide to purchase a bridge thyristor rectifier. as the first-order estimate, you represent the tramway motor by a very large inductance.
the output voltage of the thyristor rectifier can be controlled by adjusting its firing angle α.
the tramway dc motor operates at 300 v and takes 45 a when the tramway is running on level tracks.
part a) (2 points): draw the block diagram of the system.
part b) (2 points): calculate the dc voltage at the rectifier output terminals.
part c) (3 points): calculate the power at the rectifier output terminals.
part d) (3 points): calculate the ac voltage needed to supply the load, as function of α.
part e) (5 points): select the appropriate system voltage and value of α.
part f) (5 points): calculate the thd of the ac current for the values selected in part e).