A3 φ, 50 Hz infinite bus bar is connected to two synchronous generators. Generator 1 has a speed of 300 rpm and generator 2 has 30 poles. Determine: the speed of generator 2 the number of poles of generator 1
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A3 φ, 50 Hz infinite bus bar is connected to two synchronous generators. Generator 1 has a speed of 300 rpm and generator 2 has 30 poles. Determine:
- the speed of generator 2
- the number of poles of generator 1
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- there may be more than one answeri need the answer as fast as possible please.In a certain sub-station, there are 5 d.c. shunt generators in parallel, ench having an armature resistance of 0.1 0, running at the same speed and excited to give equal inducnd emfs Each generator supplies an equal share of a total load of 250 kW at a terminal voltage of 500 V into a load of fixed resistance. If the field current of one generator is raised by 4%, the others remaining unchanged, calculate the power output of each machine and their terminal voltages under these conditions Assume that the speeds remain constant and flux is proportional to field current
- A 50 Hz three-phase Y-connected 4 pole synchronous generator is rated at 15 kVA, 400 V (line-to-line). The synchronous reactance Xs per phase is 20. The no-load (open circuit, line-to line) teminal voltage follows the magnetisation curve shown in Figure Q2a below. 500 E 450 400 350 300 250 200 150 100 50 0.5 1 1.5 2.5 Field current (A) Figure Q2a: Magnetisation curve for rotor of a synchronous generator. (i) Determine the rated speed. (ii) What is the field current required at full-load operation at 0.8 lagging pf. (iii) Draw the phasor diagram for the mode of operation described in (ii) above. (iv) If the field current is set to 1.5 A, calculate the total active power that is delivered by the machine when it is operating as a generator connected to a 400 V (line-to- line) infinite bus and making a torque angle of 5°. Open-circuit terminal voltage (V)h 13 A 100kW generator, 25OV, 6 poles have a wave wound armature with 300 turns then the number of compensating winding turns per pole is .approximately equal to if the ratio of pole arc/pole pitch is 0.72 36 O 18 16 none of the mentioned. ) 8. 50please help how to know if they are given terminal voltage or phase voltate. what is the difference between both and the answer would change?
- and t A common base of 100 MVA and 25 KV is selected. What is the current base (Ig) Select one: O a. 4 KA O b. None of these O c. 6.25 kA O d. 2.309 KA A 100-MVA, 60-kV, three-phase synchronous generator has a synchronous reactance of armature resistance. The generator is operating with an excitation per phase E= 47.116 power before losing synchronism (stability limit). and the armature c Thus, the maximum generated power is Pmax =three-phase, 400V (line voltage), 60 Hz, 6-pole, star-connected synchronous generator has a synchronous reactor of 1.2 ohms per phase. the armature current of the generator at full load is 64 A at a power factor of 0.95 back. this generator has 2 kW rotation loss and 1.6 kW core loss at full load. the excitation current is set to be 400V ( line voltage) when the generator is idle. when the generator is loaded with 0.95 reverse power factor current at full load a) find the Rotary field speed of the generatorb) find the mechanical speed of the generatorc) What is the output voltaged) find the yielde) find voltage regulationSix natural gas turbines drive six synchronous generators, providing 720 MW to a 24.6 kV infinite bus. The generators have a per phase reactance of 90%. Standard operating procedures require the generators to provide power at unity power factor, but the generators must be able to tolerate sudden changes in steam output of +/- 12% (shaft power is directly proportional to steam output). I'm trying to Calculate how power factor, armature current and power angle change if steamoutput increases 12% without changes in excitation to the rotor. I'm also trying to Calculate the percent change in rotor current required to maintain unity power factor if the steam output increases 12%. Recalling how rotor flux relates to excitation current. Assume operation in the linear regime of the B-H curve I know that the angle should be the only change, and that the magnitude does not. The rotor current does not change and that is controlling the internal energy Ea. But I'm not sure how to calculate this…
- Three identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 21 MVA, 50 Hz, 0.85 PF lagging, 4-poles, Y-connected, with synchronous reactance of 2 Q and an armature resistance of 0.05 Q. Each of generators G1 , G2, and G3 has a characteristic power-frequency slope of 5.2 MW/Hz , 4.5 MW/Hz, and 4.9 MW/Hz, respectively The no-load frequency of each generator is set to 52.4 Hz. The load increases with no changes in the settings of the no-load frequencies, until a generator reaches its maximum rated power first. At what system frequency does this limit occur? Select one: O a. fsys = 48.97 Hz O b. fsys = 48.25 Hz c. fsys = 49.22 Hz O d. NoneHow does a synchronous generator operate, and what are its primary applications in power generation?A 4 pole dc generator with duplex wave winding has 48 slots and four elements per slot. The flux perpole is 2.5 x 10 Maxwells and the speed of the prime mover is 30 rpm. What is the average generatedarmature voltage? Neglecting brush drop.
