Problem 4.9: A 60-Hz synchronous generator rated 30 MVA at 0.90 powerfactor has the no-load frequency of 61 Hz. Determine (1) the prime moverspeed regulation, (2) generator frequency regulation, and (3) generatorfrequency droop rate.

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Answered: Problem 4.9: A 60-Hz synchronous…

Introductory Circuit Analysis (13th Edition)

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Publisher:Robert L. Boylestad

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Q2/ A three-phase, 0.8 MVA, 3.3 kV, star connected synchronous generator has 5 Ohm per phase synchronous reactance and negligible armature resistance. Find the: a- Percentage voltage regulation at 0.8 lcading power factor at full load b- Load angle at unity power factor. c- Excitation voltage when the generator operating at half the full load with 0.8 lagging power factor.
A three phase, synchronous generator ed at reactance of 1.2 ohm /phase, and an armature resistance of 0.5 load with 0.8 lagging power factor is
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4- Why should the terminal voltage drop more in the case of shunt generator thàn in the case of separately excited generator as the load current is increased?
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A 40 MVA, 24-KV, 0.85-PF-lagging, 50-Hz, 4-pole, Delta-connected, 3- phase, steam-turbine generator has a synchronous reactance of 10 per- phase, and a negligible armature resistance. The field current is adjusted for 26-KV generator output line voltage at no load. This generator is connected to operate in parallel with a large power system (infinite bus). If the field current is unchanged, determine the absolute maximum output power of this generator. Select one: a. Pout, max = 187.2 MW b. Pout, max = 108 MW O c. Pout, max = 62.4 MW %3D O d. None
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A 13.8-kV, 50-MVA, 0.9-power-factor-lagging, 60-Hz, four-pole Y-connected synchronous generator has a synchronous reactance of 2.5 Q and an armature resistance of 0.2 2. At 60 Hz, its friction and windage losses are 1 MW, and its core losses are 1.5 MW. The field circuit has a dc voltage of 120 V, and the maximum Ir is 10 A. The current of the field circuit is adjustable over the range from 0 to 10 A. The OCC of this generator is shown in Figure P4-1. 4.2 Open-circuit characteristic 20 18 (a) How much field current is required to make the terminal voltage V, (or line voltage V,) equal to 13.8 kV when the generator is running at no load? 16 (b) What is the internal generated voltage E, of this machine at rated conditions? 14 12 (c) What is the phase voltage V of this generator at rated conditions? 10 (d) How much field current is required to make the terminal voltage V, equal to 13.8 kV when the generator is running at rated conditions? (e) Suppose that this generator is running at…
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Two Generators rated 200 MW and 400 MW are operating in parallel. The droop characteristics of their governor are 4 % and 5% respectively fro no load to full load. The speed changers are so set the governor operate at 50 Hz sharing the full load of 600 MW, in the ratio of their ratings. If the load reduces to 400 MW, how will it be shared among the generators and what will the system frequency be? Assume free governor system. The speed changers of the governors are reset so that the load of 400 MW is shared among the generators at 50 Hz in the ratio of their ratings. What are the no-load frequencies of the generators ?

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Problem 4.9: A 60-Hz synchronous generator rated 30 MVA at 0.90 power factor has the no-load frequency of 61 Hz. Determine (1) the prime mover speed regulation, (2) generator frequency regulation, and (3) generator frequency droop rate.