Q2)two shunt generators running in parallel supply a total load current of ( 4000 A ) .Each generator has an armature resistance of (0.02 ohm )and a field resistance of ( 40 ohm). The fields are excited so that the E.M.F induced in one generator is (480 v ) and another ( 490 V) . Find the bus-bar voltage and kilowatt output of each generator ?
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- The armature of a 6-pole separately excited dc generator is triplex wave wound with 534 conductors. This machine delivers power to the load at 200V while being driven at 900rpm. At this load, the armature circuit dissipates 640W. If the flux of this generator is 180-mWb, determine the kW rating of the load served. Assume a total brush drop of 2V.A short shunt compound DC generator supplies a load current of 10A at a voltage of 10 volts. If the resistance of armature, shunt field and series field windings are 0.001 ohm, 1 ohm 0.00 ohm respectively. a) Draw the the figure. And find the generated voltage.Two generators rated 200MW and 400MW are operating in parallel. The droop characteristics of both the governor have a drop of 4%. from no load to full load. Assuming that the generators are operating at 50Hz at no load, how would a load of 600MW be shared between them? What will be the system frequency at this load? Assume free governor operation.
- Two similar 6,600-V, three phase generators are running in parallel on constant-voltage andfrequency bus bars. Each has an equivalent resistance and reactance of 0.05 Ω and0.5 Ω respectively and supplies one half of a total load of 10,000 kW at a laggingp.f. of 0.8, the two machines being similarly excited. If the excitation of onemachine be adjusted until the armature current is 438 A and the steam supply to theturbine remains unchanged, find the armature current, the e.m.f. and the p.f. of theother alternator.111/ The armature reaction of the DC generator reduces the generated EMF. Select one: True FalseA three-phase, Y-connected, 220 V, 5 kVA, salient-pole synchronous generator is employed to supply power to a load with unitary fp. By means of a slip test, the direct-axis synchronous reactance is determined to be 12 Ω and the quadrature-axis synchronous reactance, 7 Ω. Consider that the rated current is delivered to the load at the rated voltage and that the armature resistance is negligible. (a) Calculate the corresponding value of the excitation voltage. (b) What is the value of the internal phase shift angle? (c) What is the value of the power angle?