single-phase, 10-kVA, 200-V, generator has an internal impedance Z, of 2 Q. Using the ratings of the generator as base values, determine the generated per-unit voltage that is required to produce full-load current under the short-circuit condition.
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a single-phase, 10-kVA, 200-V, generator has an internal impedance Z, of 2 Q. Using the ratings of the generator as base values, determine the generated per-unit voltage that is required to produce full-load current under the short-circuit condition.
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- synchronous generator threewThe phases are rated at 1000 kVA and operate at a voltage of 6.6 kV. The product resistance per phase is 0.38 ohms and the leakage reactance is 0.5 ohms per phase. The generator works to provide full load at a power factor of 0.85 delayed and at normal voltages. Find the value of the no-load voltage.2.) A 60-MVA, 69.3 kV, 3-phase synchronous generator has a synchronous reactance of 15 ohms per phase and negligible resistance. The generator is delivering rated power at 0.8 pf leading at rated terminal voltage to an infinite bus bar. Determine the magnitude of the power angle. Subject Electrical machine 2In a short compound generator, the terminal voltage is 230 induced emf tion of this power. field, diverter and arnmature resistances are 92 2, 0.015 2, 0.03 2 and 0. 03 2 respectively. V when generator delivers b) total power generted and 160 A. Determine a) c) distribu- Given that the shunt field, series
- A synchronous generator is rated 645 MVA, 24 kV, 0.9 pf lagging. It has a synchronous reactance 1.2 . The generator is feeding full load at 0.9 pf lagging at rated voltage. Calculate: (a) Excitation emf (E,) and power angle & (b) Reictive power drawn by the load Carry out calculations in pu form and convert the result to actual values.two alternators A and B having 5% speed regulation are working in parallel at a station. Alternator A is rated at 15 MW while B is at 20 MW. When the total load to be shared is 12 MW, then how much of the load will be shared by the alternator B?Discussion:- 1. What do you understand by "armature- reaction"? Discuss the effect of armature reaction in an alternator when it is loaded with resistive, inductive and capacitive loads. 2. Give the value of voltage regulation for different power factors at full load current and interpret their values.
- A 6 kV , 1000 kVA , 3-ph alternator is delivering full-load at 0.8 lagging. Its reactance is 20% and resistance negligible. By changing the excitation, the e.m.f. is increased by 25% at this load. Calculate the new current and power factor. The machine is connected to infinite bus-bars.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?2.41 A three-phase 25-kVA, 480-V, 60-Hz alternator, operating under bal- anced steady-state conditions, supplies a line current of 20 A per phase at a 0.8 lagging power factor and at rated voltage. Determine the power triangle for this operating condition.
- Two turbo alternators rated for 140 MW and 260 MW have gov ernor drop characteristics of 5% from no load to full load. They are connected in parallel to share a load of 250 MW. Determine the load shared by each machine suming free governing action.Question 3: A 6.6 kV, 3-phase, star-connected turbo-alternator of synchronous reactance 0.5 ohm/phase is applying 86 MVA at 0.8 lagging p.f. to a large system. If the steam supply is suddenly cut off, explain what takes place and determine the current the machine will then carry. Neglect losses.A Y- connected, 10-KVA, 230- has a field winding resistance of 4.59. At an operation of 0.85 lagging power factor, the excitation current is recorded at 10A. the core loss is 300W, and the mechanical loss is 200W. If the corresponding efficiency is 84.9%. calculate the per- phase armature winding resistance.