(Solved): 1. An industrial load is supplied by a single-phase ac power supply. The load is modelled by means ...

1. An industrial load is supplied by a single-phase ac power supply. The load is modelled by means of a parallel impedance. The equivalent circuit is shown in Figure 1 and the parameters are shown to the right. Is Rs Vs Rm Xm V? = 230 V R$ = 0.5 f = 50 Hz Rm = 50 Xm = 70 Figure 1 (a) Calculate the current Is. [4 marks] (b) Calculate the active and reactive power absorbed by the load. [6 marks] (c) Calculate the power factor at the source. [2 marks] (d) Explain a modification of the circuit that allows to achieve unity power factor at the source. Calculate the value of the circuit elements for the modified circuit. [5 marks] (e) Repeat the calculation above assuming that power factor should be corrected to 0.95 (leading or lagging). [8 marks]