(c) A separately excited DC gencrator is rated at 172 kW,430 V,400 A and 1800Dpm. Its magnetization curve is shown in Fi

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C A Separately Excited Dc Gencrator Is Rated At 172 Kw 430 V 400 A And 1800dpm Its Magnetization Curve Is Shown In Fi 1 (121.36 KiB) Viewed 22 times

(c) A separately excited DC gencrator is rated at 172 kW,430 V,400 A and 1800Dpm. Its magnetization curve is shown in Figure Q4(e). The generator's characteristics are: RA​=0.05nVF​=430 V​RF​=20nRadj ​=0 to 300nNF​=1000 tuns per pole ​ (i) Sketch an equivalent circuit of the generator with proper labels. (2 marks) (ii) If Redj ​=63Ω, and the prime mover is driving at 1500rpm, calculate the generators" no-load terminal voltage. (3 marks) (iii) Calculate the terminal voltage if a 360 A load is coenected to its terminal, Assuming the generator does not have compensating winding. Its armature reaction at this load is 450 A. turns. The prime mover is driving at 1500rpm. (4 marks) (iv) For Q4(e)(iii), the terminal voltage is lower thas no-load terminal voltage calculated from Q4(c) (ii). Investigate the adjustment of field current, lF​ and Redy ​ to raise for the terminal voltage to match the no-load terminal voltage. (6 marks) Field cursent, A Note: Whes the field current is zeeo, E−​is about 3 V. Magnctization curve for the DC gencrator, made at a constant speed of 1800rpm Figure Q4(e)