A synchronous generator with 4 poles has a rated output frequency of 60Hz. If the generator was initially producing 7,759 volts, then what will voltage be if speed drops 25% from rated speed while excitation remains unchanged and why?
A synchronous generator with 4 poles has a rated output frequency of 60Hz. If the generator...
1 a Determine the synchronous speed of a motor that has a frequency of 60Hz and 12 poles. The synchronous speed of a 3-phase, 4-pole induction motor is 60 rev/s. Determine the frequency of the supply to the stator windings. The synchronous speed of a 3-phase induction motor is 25 rev/s and the frequency of the supply to the stator is 50 Hz. Calculate the equivalent number of pairs of poles of the motor. A 6-pole, 3-phase induction motor is...
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 synchronous generator is driven by a diesel engine to provide electricity to a remote mining operation. The generator is three-phase, Y-connected, 60 Hz, 900 rpm, 600 V, 3300 kW, 4125 kVA, and it has a synchronous reactance of 0.120 Ω per phase. Ignore all losses, and assume the machine iron is not saturated.(a) The generator is set to deliver its rated active power at unity power factorand rated terminal voltage. Determine:i. The speed of the diesel engine driving the generator;ii. The rotor electrical...
S. A three-phase, 4-pole, Y-connected synchronous generator is rated 575V, 200k VA, 60Hz. The generator's synchronous reactance is X-0.Q. Losses are negligible. The generator is comnected to an ideal 575V three- phase 60 Hz bus. Use V, for phase a-to-neutral as the reference angle (a) The generator's input power is 150kW. The generator's field current is adjusted to 10A which caases the generator to operate at unity power factor. What is the generator's phase-a armature current Ia (magnitude and phase)?...
A 3 -phase, \(60-\mathrm{H} 2\), synchronous generator has the following data:Rated MVA \(=22.8 \mathrm{MVA}\)Rated voltage \(=13.8 \mathrm{kV}\)\(X_{d}=1.8\) pu on rated MVA and rated voltage base \(X_{d}^{\prime}=0.3\) pu on rated MVA and rated voltage base CT ratio \(=1200 \mathrm{~A}: 5 \mathrm{~A}\)PT ratio \(=14.4 \mathrm{kV}: 120 \mathrm{~V}\)a) Explain why it is important to have synchronous generator under-exciation or loss of excitation protection. [5 marks]b) Design a loss of excitation relay for this generator based on the standard single mho circle design, and...
Could you please help solve this question. The following generator supplying rated load into a large grid at rated voltage (11kV) and 0.85 PF lagging Generator: 20 MVA, X = j15%. Voltage 11kV i) Determine the internal generator voltage. ii) The load suddenly drops to 50% rated power. If the rotating energy of the generator and its associated turbine is 2.0 p.u-seconds when running at its synchronous speed. It has 2 poles and system frequency is 50 Hz. Determine: (ii-a)...
Problem 4 A synchronous generator rated 480V, 500kVA, 0.9pf, has a synchronous impedance of 160% on the generator base rating of 500kVA. The generator requires 5A of excitation current to maintain and open circuit voltage of 480V. If the generator is operating at 400k W at 0.9 p.fleading (delivering kVAR to the system), calculate the following assuming operated connected to a 480V infinite bus: (neglect internal resistance and losses) a) Armature current, I(a): (include magnitude and angle referenced to V(a)-277/0...
3. Poles, speed a.) A motor-generator system can be used to converter power from 50Hz system to 60Hz system. Suppose a synchronous motor is mechanically connected with a synchronous motor to converter power from 50Hz to 60Hz. What is the relationship of the poles between the motor and generator?(5) b.) If the common shaft of the motor and generator is rotating at speed of 600r/min, what are the number of poles of the synchronous motor and synchronous generator?(10)
A three-phase synchronous generator with rated data VM = 20 kV, SM = 100 MVA, n = 500 rpm is driven by a turbine that can provide a maximum of 1.6 MNm. Synchronous reactance, XS = 3Ω / phase. The armature resistance (Ra ) is neglected. In open circuit mode (P = 0), an excitation current of 300 A is required to obtain rated voltage (VM ). The machine should be phased into a strong grid, 3x20 kV, 50 Hz....