1-oro€_Y•P\•Y¥V.jpg →Electrical Technology6. The following table gives open-circuit voltages fcr different values cefield current for a d.c. generator:224Open-circuit voltage (V)Field current (A)120 240 334 400 444 4700-5 1-0 15 2:0 2-5 3-0Express these values graphically and determine therefrom thegenerated e.m.f. when the shunt field circuit has a resistance of 200 9Find also the critical resistance of the shunt field circuit. The effectsof armature resistance and brush volt drop may be neglected,(E.M.E.U., O.1)7. The following table relates to the open-circuit curve of a shunt gen-erator running at 750 rev/min:Generated voltage (V)Field current (A)172 300 360 385 3952 3 4 5101Determine the no-load terminal voltage if the field circuit resistanceis 125 0.If the speed is now halved, what is the resultant terminal voltage?At the reduced speed, what value of field circuit resistance will give ano-load terminal voltage of 175 V?8. What conditions must be fulfilled for the self-excitation of a d.c. shuntgenerator?The open-circuit characteristic of a shunt-excited d.c. machine, runat 1200 rev/min, is:(N.C.T.E.C., O.2)Terminal voltage (V)Field current (A)47 85 103 114 122 127 135 1410-2 0:4 0-6 0-8 1-0 1-2 1-6 2:0The field coil resistance is 55 0. Determine: (i) the value of thefield-regulating resistance to enable the machine to generate 120 V onopen circuit when run at 1200 rev/min; (ii) the value of the open-circuitvoltage when the regulator is set to 20 2 and the speed is reduced to800 rev/min.9. A shunt generator on test is separately excited and driven at 1000rev/min. The open-circuit test figures are as follows:(U.E.I., O.2)Field current (A)Induced e.m.f. (V)0-157 0-477 0-663 0-805 1-0 1-2912-5 100 300 400 450500 -550The machine is then shunt-connected and run at 1000 rev/min witha constant ficld-circuit resistance of 540 S, The armature-circuitresistance is 1 N. Deduce and plot the load characteristic of thismachine, neglecting the effect of armature reaction. What is the ap-proximate value of the maximum load current?(E.M.E.U.)10. The open-circuit characteristic of a shunt generator when separatelyexcited and running at 1000 rev/min is given by:Open-circuit voltageField amperes56112 150 180 200 216 2300-5 1-0 1-5 2-0 2-5 3-0 3-5II

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224 Electrical Technology 6. The following table gives open-circuit voltages fer different values os field current for a d.c. generator: Open-circuit voltage (V) Field current (A) 120 240 334 400 444 470 0-5 1-0 15 2-0 2-5 3-0 Express these values graphically and determine therefrom the generated e.m.f. when the shunt field circuit has a resistance of 200 2. Find also the critical resistance of the shunt field circuit. The effects of armature resistance and brush volt drop may be neglected. (E.M.E.U., O.1)

224 Electrical Technology 6. The following table gives open-circuit voltages fer different values os field current for a d.c. generator: Open-circuit voltage (V) Field current (A) 120 240 334 400 444 470 0-5 1-0 15 2-0 2-5 3-0 Express these values graphically and determine therefrom the generated e.m.f. when the shunt field circuit has a resistance of 200 2. Find also the critical resistance of the shunt field circuit. The effects of armature resistance and brush volt drop may be neglected. (E.M.E.U., O.1)

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter6: Power Flows

Section: Chapter Questions

Problem 6.61P

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