نقطتا During the test of separately excited generator the speed of rotation must be held constant and the generator field resistance must be adjusted to make the generator terminal voltage 220V * .at no load True O False O
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Q: Q/ During the test of separately excited generator the speed of rotation must be held constant and…
A: During the test of separately excited generator the speed of rotation must be held constant and the…
Q: (2) jkbi During the test of separately excited generator the speed of rotation must be held constant…
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A: According to question: 1. P=2NS=3000rpm∵NS=120fP⇒f=PNS120⇒f=2×3000120∴f=50Hz
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A: False
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A: In this question we need to find a Field current required to keep a terminal voltage 381 V.
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A: deviation angle=π3=60°
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
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- Energy Question-1) Three identical synchronous generators were connected in parallel and the idle frequency values of each generator were set to 54 Hz. The frequency - power characteristic slopes of the first and second generators are 5.3 MW/Hz and the slope of the third generator is 3.9 MW/Hz. When these three identical synchronous generators feed a load together, the system frequency becomes f=51.7 Hz. According to this;a-) Calculate the active power value that the first generator will provide to the load.b-) Find the active power that the second generator will provide to the load.c-) Find the active power that the third generator will provide to the load.d-) Calculate the power of the load.(All values in options a, b, c, and d in this Question will be entered as two digits after the comma.) NOTE: If the information in the text and the photo is different, please solve the question using the information given in the photo. Help me please... Thank you so much.50 KW, 240 V enduvi resistance of a generator with foreign excitation is 0.02 ohms. Generatorproduces rated voltage at rated load. Endüvi voltage and endüvi current at rated loadcalculate? If the output voltage is kept constant at 240V and the output power is reduced to 45 KWfind the enduvi tension necessary for this?Two shunt generators operating in parallel delivering a total load current of 240 A. One of the generators is rated 50 KW and the other 100 KW. The voltage rating of both machines is 500 V and have regulations of 4% and 6% respectively. Assuming linear characteristics, determine (i)the current delivered by each machine (ii) terminal voltage.
- A three-phase, 250 MVA, 16 kV rated synchronous generator is feeding into an infinite bus bar at 15 kV. The generator has a synchronous reactance of 1.62 pu. It is found that the machine excitation and mechanical power input are adjusted to give E = 24 kV and power angle δ = 30◦. a) Determine the line current and active and reactive power fed to the generator terminal. b) The mechanical power input to the generator is increased by 20% from that in part (a) but its excitation is not changed. Find the new line current and power factor. c) With reference to part (a) current is to be reduced by 20% at the same power factor by adjusting mechanical power input to the generator and its excitation. Determine E, angle δand mechanical power input.A short shunt compound generator has an armature, shunt field and series fieldresistances of 0.02 ohm, 80 ohm and 0.03 ohm respectively. The generator’s induced emfis 510V when the terminal voltage is 500V. How much load current is delivered underthis condition? Answer: 197.47AA three-phase, 13.8 kV, 10 MVA, 0.8 PF-lagging, 60 Hz two-pole, Y-connected steam-turbine generator has a synchronous reactance of 12 Ω per phase and an armature resistance of 1.5 Ω per phase. This generator is operating in parallel with a large power system (innite bus). ONLY ANSWER PART D)a) What is the magnitude of internal voltage Ea at rated conditions?b) What is power angle δ of the generator at rated conditions?c) If the eld current is constant, what is the maximum active power possible out of this generator (taking into account Ra)? How much reserve power does this generator have at full load?d) At the absolute maximum active power possible, how much reactive power will this generator be supplying or consuming? Sketch the corresponding phasor diagram assuming I(f) is still unchanged.
- A 10-kW, 250-V compound (long-shunt) generator has a no-load voltage of 230 V. The shunt field has 800 turns per pole and the series field 8.5 turns per pole. The shunt- and the series-field resistances are 80 ohms and 0.07 ohm, respectively. In order to make the generator flat-compound, so that it will have a no-load voltage of 230 V and a full-load voltage of 230 V, the series must produce 225 amp-turns. Calculate: (a) the resistance of the diverter to accomplish this change; (b) the total number of ampere-turns produced by each pole at no-load and at full-load.Define derating, why must a 60Hz generator be derated if it is to be operated at 50Hz? Find percentage of derating done. (4) A generator connected with an infinite bus bar, the frequency indicator shows that frequency is decreasing from 50Hz. What action you will take for restoration of frequency. (2) A generator is loaded with certain load, and its voltage regulation is very poor. What are various ways by which you can improve its regulation? (2)If the armature resistance of a 3-phase, 318.75 kVA, 2300-V synchronous generator is 0.35 ohms per phase, the synchronous reactance is It is 1.2 ohms. Calculate the excitation voltage and voltage regulation for the following load cases: a) Full load, back power factor of 0.8 and rated voltage. b) Full load, forward power factor of 0.6 and rated voltage.
- A three-phase, 250 MVA, 16 kV rated synchronous generator is feeding into an infinite bus bar at 15 kV. The generator has a synchronous reactance of 1.62 pu. It is found that the machine excitation and mechanical power input are adjusted to give E = 24 kV and power angle δ = 30 degree. a) Determine the line current and active and reactive power fed to the generator terminal. b) The mechanical power input to the generator is increased by 20% from that in part (a) but its excitation is not changed. Find the new line current and power factor. c) With reference to part (a) current is to be reduced by 20% at the same power factor by adjusting mechanical power input to the generator and its excitation. Determine E, angle δ and mechanical power input. d) With the reduced current as in part (c), the power is to be delivered to generator terminal at unity power factor, what are the corresponding values of E and δ and also the mechanical power input to the generator. Per-unit values are given on…A 760-kVA, 2300-V, three-phase, Y-connected, synchronous generator is operated at its rated speed to obtain its rated no-load voltage. Later, another test finds that the short-circuit phase current is 128A. The average resistance of each phase is 0.56 ohm. 1) Determine the synchronous reactance per phase. 2) Determine the voltage regulation when the generator delivers the rated load at its rated voltage and 0.75 PF lagging.A 400V, 50Hz, Y-connected, 4-pole synchronous generator has a per-phase synchronous reactance of 0.5 Ω. Its full-load armature current is 50A at power factor of 0.8 lagging. The armature resistance is negligible. Calculate: (i) Per-phase internal generated voltage, EA. (ii) The terminal line voltage of the generator if the generator is loaded at 40 A at power factor of 0.8 lagging. (iii) Draw the phasor diagram for (ii) with a proper label (iv) The load at (ii) is removed and three 12 Ω resistors are connected in wye across the terminals of the generator. Calculate the terminal voltage across the generator