Question

04- Chapter 8 Synchronous Motors Referring to the v curves in Figure 8 13,the machne is at 50% load with a Unity Power Factor Mark the operating point on the V-curve and estimate or determine The excitation voltage to maintain unity power factor is the machine is loaded to 50% (a) (b'"the load is increased to 100% and the field current is not changed, will the machine pull out of (c) tfthe load is increased to 15% and the field current is not changed, win the machine pull out of (d) The excitation voltage to maintain unity power factor if rated load n increased to 100% of rated load (e) The excitation voltage to maintain unity power factor if the rated load is increased to 150% of rated load 160 140 120 60 20 FIGURE13 Farmily of ropresentatve V curves for asynchronous motor

Answer 1

maintain UPF i Hns a) The excitustion voltt e excirhon ce la from gro ) At too y ruted load , the excitation votte Comes within the stability limit. dtence nachine wid not pal out ot synchro num goes out oy tc stablity timit tlence machine 120 60 Lending power faor 20 200V 133.33V Le, ad ated(oad veered incre as ed to % 아 to o,/- e) The excitation u。ha, eto Maintain UPF it-the rated toad i inreased 15o 7- O om

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