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1. An eight pole synchronous generator used in a WECS is connected to power grid having...
4-pole, 50-Hz synchronous generator has a rating of 200 MVA, 0.8 power factor lagging. The kinetic...
4-pole, 50-Hz synchronous generator has a rating of 200 MVA, 0.8 power factor lagging. The kinetic energy of the machine at synchronous speed is 1000 MJ. The machine is running steadily at synchronous speed and delivering 50 MW to a load at a power angle of 8 electrical degrees. The load is suddenly removed. Determine the acceleration of the rotor in rpm/S. If the acceleration computed for the generator is constant for a period of 8 cycles, determine the following...
Question 5 (Svnchronous machines) a. A synchronous generator connected to an infinite grid has its frequency and terminal b. A six-pole, Y-connected three-phase synchronous machine rated 208 V (line-...
Question 5 (Svnchronous machines) a. A synchronous generator connected to an infinite grid has its frequency and terminal b. A six-pole, Y-connected three-phase synchronous machine rated 208 V (line-to- voltage fixed. What is the effect of increasing the excitation current in this case? line), 5500 VA has a synchronous reactance of 8 2 per phase at rated terminal voltage. It is operating as a generator connected to an infinite grid Determine the excitation voltage and the power angle if the...
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.5Q/phase and a...
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected
synchronous generator has a resistance 0.5Q/phase and a synchronous
reactance of 5Q/phase. The generator is supplying its rated power
at its rated voltage and at a power factor lagging. The rotational
loss is 2 kW. Calculate:
(a) the power developed,
(b) the power angle,
(c) the voltage regulation, and
(d) the shaft torque.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.50/phase and a synchronous...
Wind turbine can be used to support the grid frequency. Let us assume, that generator rotates...
Wind turbine can be used to support the grid frequency. Let us assume, that generator rotates at 1.360 MW power with a rotating speed 12 rpm. How long turbine can provide 2 MW power be decelerating the wind rotor speed, if the allowed speed deviation is 20 %. Assume constant aerodynamic power P = 1,360 MW during the deceleration. Total inertia of wind turbine is 4820000 kgm2. The given aerodynamic power was 1.360 MW. The requested power to the grid...
A 480-V, 60-Hz, A-connected, four-pole synchronous generator has a synchronous reactance of 0.1 ohm and an...
A 480-V, 60-Hz, A-connected, four-pole synchronous generator has a synchronous reactance of 0.1 ohm and an armature resistance of 0.0 15 ohm. At full load, the machine supplies 1200 A at 0.8 PF lagging. Under full-load conditions, the friction and windage losses are 40 kW, and the core losses are 30 kW. Ignore any field circuit losses c) How much power is the generator now supplying? How much power is supplied to the generator by the prime mover? What is...
please solve the multiple choices [17-18-19-20] (a) What kind of rotor construction is used in this machine? Cylindrical or salient pole rotor? Why? (b) The field current and the mechanical in...
please solve the multiple choices [17-18-19-20]
(a) What kind of rotor construction is used in this machine? Cylindrical or salient pole rotor? Why? (b) The field current and the mechanical input power are adjusted so that the machine delivers 15 k W at 0.9 lagging power factor. Is it a generator or motor? Draw the per- phase equivalent circuit of machine. (c) Determine the excitation voltage and the power angle (degree) Problem 1. (10 Points) A 3-phase, 20 kVA, 460...
A 480 V, 60 Hz, 470 kVA, 0.85 PF lagging, 2-pole, Y-connected synchronous generator has a...
A 480 V, 60 Hz, 470 kVA, 0.85 PF lagging, 2-pole,
Y-connected synchronous generator has a synchronous reactance of
XS=0.016 Ω and an armature resistance of RA=0.016 Ω. At rated
conditions the core losses are 7 kW. Friction losses and field
winding losses are 8 kW. Suppose the machine is connected to an
infinite bus (hence the terminal voltage is fixed) and it is
running at the rated conditions.
a) What is the rotor speed in rpm?
b) Calculate the...
A 10MVA 13.8-kV 60-Hz four-pole Y-connected synchronous generator is delivering rated power at unity power factor....
A 10MVA 13.8-kV 60-Hz four-pole Y-connected synchronous generator is delivering rated power at unity power factor. a) Draw the equivalent circuit for the analysis of this problem b) Find the synchronous reactance given that the field excitation voltage is 6.89kV (per phase) and leads the terminal voltage by an angle π/4. c) In a special occasion, the generator is operated as a motor (the synchronous reactance is the one derived in (a)). At rated terminal voltage, what is the minimum...
A 50-Hz generator, connected directly to an infinite bus operating at a voltage of 120° pu, has a synchronous reactance...
A 50-Hz generator, connected directly to an infinite bus operating at a voltage of 120° pu, has a synchronous reactance of 1.35 pu. The generator no-load voltage is 1.1 pu, and its inertia constant H is 4 MJ/MVA. The generator is suddenly loaded to 60 percent of its maximum power limit. Determine the frequency of the resulting natural oscillations of the generator rotor.
A 50-Hz generator, connected directly to an infinite bus operating at a voltage of 120° pu, has...
Consider a 3-phase, 4 pole, 60Hz, 450 V synchronous generator rated to supply 1687.5 kVA to...
Consider a 3-phase, 4 pole, 60Hz, 450 V synchronous generator rated to supply 1687.5 kVA to a ship distribution system requiring a 0.8 lagging power factor. (a) If this machine was operating at rated conditions, what would the real (P) and reactive (Q) power and the current being supplied? (b) If the generator has an efficiency ( η ) of 95%, what torque does the prime mover provide? (c) What is the speed of the rotor (rpm)?
Question 5 (Svnchronous machines) a. A synchronous generator connected to an infinite grid has its frequency and terminal b. A six-pole, Y-connected three-phase synchronous machine rated 208 V (line-to- voltage fixed. What is the effect of increasing the excitation current in this case? line), 5500 VA has a synchronous reactance of 8 2 per phase at rated terminal voltage. It is operating as a generator connected to an infinite grid Determine the excitation voltage and the power angle if the...
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected
synchronous generator has a resistance 0.5Q/phase and a synchronous
reactance of 5Q/phase. The generator is supplying its rated power
at its rated voltage and at a power factor lagging. The rotational
loss is 2 kW. Calculate:
(a) the power developed,
(b) the power angle,
(c) the voltage regulation, and
(d) the shaft torque.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.50/phase and a synchronous...
please solve the multiple choices [17-18-19-20]
(a) What kind of rotor construction is used in this machine? Cylindrical or salient pole rotor? Why? (b) The field current and the mechanical input power are adjusted so that the machine delivers 15 k W at 0.9 lagging power factor. Is it a generator or motor? Draw the per- phase equivalent circuit of machine. (c) Determine the excitation voltage and the power angle (degree) Problem 1. (10 Points) A 3-phase, 20 kVA, 460...
A 480 V, 60 Hz, 470 kVA, 0.85 PF lagging, 2-pole,
Y-connected synchronous generator has a synchronous reactance of
XS=0.016 Ω and an armature resistance of RA=0.016 Ω. At rated
conditions the core losses are 7 kW. Friction losses and field
winding losses are 8 kW. Suppose the machine is connected to an
infinite bus (hence the terminal voltage is fixed) and it is
running at the rated conditions.
a) What is the rotor speed in rpm?
b) Calculate the...
A 10MVA 13.8-kV 60-Hz four-pole Y-connected synchronous generator is delivering rated power at unity power factor. a) Draw the equivalent circuit for the analysis of this problem b) Find the synchronous reactance given that the field excitation voltage is 6.89kV (per phase) and leads the terminal voltage by an angle π/4. c) In a special occasion, the generator is operated as a motor (the synchronous reactance is the one derived in (a)). At rated terminal voltage, what is the minimum...
A 50-Hz generator, connected directly to an infinite bus operating at a voltage of 120° pu, has a synchronous reactance of 1.35 pu. The generator no-load voltage is 1.1 pu, and its inertia constant H is 4 MJ/MVA. The generator is suddenly loaded to 60 percent of its maximum power limit. Determine the frequency of the resulting natural oscillations of the generator rotor.
A 50-Hz generator, connected directly to an infinite bus operating at a voltage of 120° pu, has...
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