Q-2.B. Explain what are the principle operation of alternators ?
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- Write down construction of an alternator with help of diagram and write its principle of operation. Subject is Electrical Machines.The maximum speed of an alternator working at 60 Hz is possible when the number of poles of the machine is ........ a. 4 b. 5 c. 3 d. 2The rotating part in an alternator is ................
- An alternator has 6 poles. (a) At what speed must the machine be driven to develop 60 cycles? 25 cycles? (b) What frequency is developed if the speed is 1000rpm? Please give the complete solution for this problem. Thank you!1- 1-Nose point in the PV Curve of an alternator gives you the information about a.Intersection of load line and generator characteristics b.Characteristics load line c.Maximum Real Power it can deliver d.Good voltage profile6. A 3-phase, star-connected alternator has a resistance of 0.52/phase and a synchronous reactance of 52/phase. It is excited to give 6600 V (line) on open circuit. Determine the terminal voltage and voltage regulation on full-load current of 130 A when the load p.f. is (a) 0.8 lagging (b) 0.6 leading. (Ans. (a) 3340 V (phase value); 14.1% (b) 4260 V (phase value); - 10.6%)
- A three-phase, 4-pole, 1,500 rpm alternating having a double layer-windings with 18 turns per coil. The slots per pole per phase are 10 and the coil span is 22 slots. The spread phase is 60 degrees and the flux per pole is 0.0625 Weber. If the armature windings are wye connected. a) Determine the generated voltage per phase and the line to line voltages. b) If the alternator is delivering a three - phase load of 1,200KW at 0.8 lagging power factor what is the line current of the alternatorTwo 60MVA, alternators operate in parallel. The setting of the governor are such that the rise in speed from full load to no load is 2% in one machine and 3% in the other, the characteristics being straight lines in both cases. If each machine is fully loaded when the total load is 120MW, what will be the load on the first machine (with 2% speed regulation) when the total load is reduced to 80MW?A 2MVA, 2.3kV three – phase Y – connected alternator operates at rated kVA at a power factor of 80%. The dc armature winding resistance between terminals is 0.08 ohm. The field takes 70 A at 125 V from an exciter equipment. Friction and windage loss is 20kW, iron losses 36kW and stray load losses are 2.0 kW. Calculate the efficiency of the alternator. Assume the effective armature winding resistance is 120% of the DC resistance. a. 94.0 % b. 92.1 % c. 93.2 % d. 89.5 %
- Generate a conclusion on this following statements: Determine and analyze the voltage regulation characteristics of the alternator with resistive, capacitive, and inductive loading.Alternator A (100 kVA, 3-f, 240 V, 60 Hz, 1800 rpm) is operating in parallel with alternator B (125 kVA, 3-f, 240 V, 60 Hz, 1800 rpm). The load of alternator A is 70 kW at 85% pf leading and the load of alternator B is 85 kW at 75% pf leading. Determine the pf of load.4. A 2 MVA, 2.3kV, three-phase Wye connected alternator operates at rated kVA at a power factor of 80 %. The dc armature winding resistance between terminals is 0.08-ohm. The field takes 70-A at 125-V from the exciter equipment. Friction and windage loss is 20-kW, iron loss 36-kW and stray power loss are 2.0-kW. Calculate the efficiency of the alternator. Assume the effective armature winding resistance is 120% of the dc resistance.