Question

Q2. (a) Fig. Q20) shows a separately excited DC generator with compensating windings, and rated at 430V, 400A and 1800rpm. The field winding has N-1000 turns and the fieldcircuit to enable the field current to be controlled. The generator magnetising characteristic at 1800rpm is shown in Fig. Q2(ii). d resistance R-200. Adjustable r resistance Ra 0-3000 is included in R0-3000 R.-0.05Ω R 200 V-430V N 1000 turns E, 500 400 300 100 0 1 2345 6 7910 Field Current (A) Fig. Q2 () separately excited DC generator ) magnetising characteristic at 1800rpm (i) If Raq 63Ω and the generator is driven at 1600rpm, what is the field (ii) If a 1 Ω load is connected across the output terminals, what is the terminal (ii) What field current is required to restore the terminal voltage to the no-load current and the no-load terminal voltage? voltage? value of part i), and what value of Radi is required to accomplish this?

A second separately excited DC generator has the same electrical parameters as the generator in part (a) first but does not have compensating windings. The full-load demagnetising armature reaction is equivalent to 500 Ampere-turns. (i) With Radj = 63Ω and the generator is driven at 1600rpm, what is the no-load terminal voltage? (ii) What would be the output terminal voltage if 364A were drawn from the armature at 1600rpm?

Answer 1

62) Given separetely eKated リでgenerator 6-3000 Racj 30 Ne 1000 metiaiMg chaxac teti. occ 1800 rpm CMot to sala) Volt 200 200 200 100n Rc = (00 eCD Ne-360ps the speed belouo whieh genexato nt uild-up volkoa*

Given,R63 Rsh, tineat st line dotted above as shouwem S3 e have Eon-382.222M 4sJ& the no-lood

tiven, N 1600 pm and TL 364A @600 pm Ea 382.222 volt twe nave さa = 382.220 V 364.022 Vo t Hence, teminal output voltaage of geoesato "Vt- 364. 022 Volt,
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