10.8 A 1.2 MVA, 6.6 kV, 3-phase, star-connected Alternator with a resistance of 0.4 and Synchronous reactance of 6 2 per phase delivers full load current at 0.8 pf lagging and at rated voltage. Estimate the terminal voltage for the same excitation and load current at 0.8 pf leading. [Ans: 7.9 kV]
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- 8. A 3-phase, star connected alternator is rated 500 KVA, 1.1 KV. Its effective resistance/phase and synchronous reactance/phase are 1.0 Ohms and 1.5 Ohms respectively. Calculate the percentage voltage regulation at full load 0.8 power factor leading condition. Draw the phasor diagram corresponding to leading power factor condition and drive the expression for the induced emf.10.3 A 1500 kVA, 6.6 kV, 3-phase, 50 Hz, star-connected Alternator with a resistance of 0.4 2 and a Synchronous reactance of 6 2 per phase delivers full load current at 0.8 pf lagging and at rated voltage. Estimate the terminal voltage for the same excitation and load current at 0.8 pf leading. [Ans: 8.14 kV]A 1200 kW,60 Hz synchronous alternator A identical governor droop of 0.0005 Hz/kW.Machine A takes two third of 1000kW bus load at 60 Hz.lf an additional 800 kW load is connected to the bus determine (a) bus frequency (b) load on each machine. is in parallel with a 400 kW,60 Hz alternator B.Both machines have (a) 58.6 Hz (b) 566.67 kW, 433.33 kW. (a) 59.6 Hz (b) 866.67 kW, 133.33 kW (a) 59.8 Hz (b) 666.67 kW, 333.33 kW (a) 58.9 Hz (b) 766.67 kW, 233.33 kW
- Two identical 2000 kVA alternators operate in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz. What is the maximum unity pf load that can be delivered without overloading either machineThe amplitude of the sinusoidal symmetrical AC component of the three-phase short-circuit current of an unloaded synchronous machine decreases from a high initial value to a lower steady-state value, going through the stages of and periods. Fill in the BlanksKindly solve the problem with step by step complete solution. Also, put the given and formula used so that I can understand. Thank you. A 2200V, 60 Hz, three-phase, Y-connected alternator has an effective resistance per phase of 0.5 ohm. A field current of 30A produces a full load current of 200A on short circuit and a line-to-line emf of 1100 V on open circuit. Determine the power angle of the alternator when it delivers full load at .80 lagging pf.
- Two identical 20 MW three-phase alternators operate in parallel. The governor of first machine is such that the frequency drops uniformly from 50 Hz on no-load to 48 Hz on full load. The corresponding uniform speed drop of the second machine is from 50 Hz to 47.5 Hz. How will the two machines share a load of 30 MW?10.3 A 1500 kVA, 6.6 kV, 3-phase, 50 Hz, star-connected Alternator with a resistance of 0.4 2 and a Synchronous reactance of 6 2 per phase delivers full load current at 0.8 pf lagging and at rated voltage. Estimate the terminal voltage for the same excitation and load current at 0.8 pf leading.a.) full loadb.) half load
- A generating station is to supply four regions of load whose peak loads are10 MW, 5 MW, 8 MW and 7 MW. The diversity factor at the station is 1-5 and the average annual load factor is 60%. Then the installed capacity is (25 to26)MW. O (24 to25)MW. O (23 to24)MW. OA 50 kVA, 550 volt single phase alternator draws a field current 10A at rated load with the same field current. The open circuit emf and short circuit current are 300 V and 150 A. the ohmic resistance of the armature between terminals is 0.18 ohm. The ratio of effective to ohmic resistance maybe taken as 1.5 . Determine the regulation at 0.8 power factor lagging.1. A three-phase, 318.75-kVA, 2300-V alternator has an armature resistance of 0.35 /phase and a synchronous reactance of 1.2 2/phase. Determine the no-load line-to-line generated voltage and the voltage regulation at (a) Full-load kVA, 0.8 power factor lagging, and rated voltage. (b) Full-load kVA, 0.6 power factor leading, and rated voltage.