Explain what is an Open Saturation Curve of an Alternator. What is the relationship of the...
Explain what is an Open Saturation Curve of an Alternator. What is the relationship of the field current (Decreasing and increasing field current) on the induced EMF and terminal voltage?
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Explain what is an Open Saturation Curve of an Alternator. What
is the relationship of the...
A 36 MVA, 20.8 kV, 3-phase alternator has a synchronous reactance of 9 Q and a...
A 36 MVA, 20.8 kV, 3-phase alternator has a synchronous reactance of 9 Q and a nominal current of 1 kA. The no-load saturation curve giving the relationship between Eo and I, is given in Fig. 13b. If the excitation is adjusted so that the terminal voltage remains fixed at 12 kV, calculate the exciting current required and draw the phasor diagram for the following conditions: No-load а. b. Resistive load or 36 MW Capacitive load of 12 Mvar C....
(2) B-field Curve. A circular ring of radius r = 0.10 m and resistance Ro =...
(2) B-field Curve. A circular ring of radius r = 0.10 m and resistance Ro = 2.02 sits in a uniform magnetic field pointing out of the page. The graph shows the strength of that field as a function of time (a negative value indicates that the field is pointing into the page at that moment). (a) At what time (or times) is the largest current induced in the ring? (b) Between t=2s and t = 3 s is the...
13. A single alternator isn't operating properly. Your first step in shutting down this single alternator...
13. A single alternator isn't operating properly. Your first step in shutting down this single alternator is to A. shut down the prime mover. C. open all of the feeder switches. B. reduce the output voltage of the alternator. D. open the field switch of the alternator 14. What is the typical rating of exciter voltage? A. 25 V C. 125 V B. 50 V D. 400 V 15. What type of rotors will an engine alternator usually have? A....
A 3-phase, 60 Hz, 6 pole alternator has an air gap flux that is sinusoidally distributed....
A 3-phase, 60 Hz, 6 pole alternator has an air gap flux that is sinusoidally distributed. The stator has 5 slots per pole per phase and each slot contains 4 conductors arranged in two layers. The coil pitch is 12 slots. With normal excitation and rated speed, the voltage induced per conductor is 25 volts. What is the open-circuit emf between the terminals when this machine is wye-connected and all the conductors per phase are connected in series?
A 3-phase, 60 Hz, 6 pole alternator has an air gap flux that is sinusoidally distributed....
A 3-phase, 60 Hz, 6 pole alternator has an air gap flux that is sinusoidally distributed. The stator has 5 slots per pole per phase and each slot contains 4 conductors arranged in two layers. The coil pitch is 12 slots. With normal excitation and rated speed, the voltage induced per conductor is 25 volts. What is the open-circuit emf between the terminals when this machine is wye-connected and all the conductors per phase are connected in series?
A star-connected alternator whose neutral point is solidly grounded, has an open circuit voltage of 14KV....
A star-connected alternator whose neutral point is solidly grounded, has an open circuit voltage of 14KV. The positive, negative and zero sequence impedance are j12, j4 and j2.4ohms/phase respectively. A single line to earth fault occurs on phase 'a' through a resistive object of resistance 0.8 ohms. Find a) fault current b) phase voltage of 'b' at the point of fault.
1. Current passes through a coil from left to right as shown. (a) If the current...
1. Current passes through a coil from left to right as shown. (a) If the current is increasing with time, in which direction is the induced emf? (b) If the current is decreasing in time, what then is the direction of the induced emf? I A increasing # 0000000B increasing + m dendron A W B decreasing - +
What is the open circuit voltage in V, for a cell if dark saturation current, I0= 1.000...
What is the open circuit voltage in V, for a cell if dark saturation current, I0= 1.000 x10-10A , light generated current, IL= 0.500 A, ideality factor, n = 1, and temperature, T = 300 K? Fill in the result only, use 3 significant figures, use zero before the decimal point, do not write the unites
50 Hz, 6,000 v, 25.000 kW, 2-pole synchronous generator tested. The results shown in the figure...
50 Hz, 6,000 v, 25.000 kW, 2-pole synchronous generator
tested.
The results shown in the figure below were obtained.
From the no-load saturation curve, when the terminal voltage Va =
6000 V, the field current if = 546 A.
From the short-circuit curve, when the electron current ia = 2000
A, the field current if = 300 A
Find the rated current
In the short circuit curve, find the field current that will be
the rated current
Find the short...
Please explain in detail the application of the RHR and why the electric field vectors are acting...
Please explain in detail the
application of the RHR and why the electric field vectors are
acting at angles.
Problem 8 A uniform, square, conducting loop, 20.0 cm on a side, is placed in a magnetic field, which has an initial magnitude of 0.750 T. The magnetic field is directed into the plane of the diagram and is decreasing at the rate of-0.0350 T/s. The conducting loop has its side ac along a diameter and with point b at the...
A 36 MVA, 20.8 kV, 3-phase alternator has a synchronous reactance of 9 Q and a nominal current of 1 kA. The no-load saturation curve giving the relationship between Eo and I, is given in Fig. 13b. If the excitation is adjusted so that the terminal voltage remains fixed at 12 kV, calculate the exciting current required and draw the phasor diagram for the following conditions: No-load а. b. Resistive load or 36 MW Capacitive load of 12 Mvar C....
(2) B-field Curve. A circular ring of radius r = 0.10 m and resistance Ro = 2.02 sits in a uniform magnetic field pointing out of the page. The graph shows the strength of that field as a function of time (a negative value indicates that the field is pointing into the page at that moment). (a) At what time (or times) is the largest current induced in the ring? (b) Between t=2s and t = 3 s is the...
1. Current passes through a coil from left to right as shown. (a) If the current is increasing with time, in which direction is the induced emf? (b) If the current is decreasing in time, what then is the direction of the induced emf? I A increasing # 0000000B increasing + m dendron A W B decreasing - +
50 Hz, 6,000 v, 25.000 kW, 2-pole synchronous generator
tested.
The results shown in the figure below were obtained.
From the no-load saturation curve, when the terminal voltage Va =
6000 V, the field current if = 546 A.
From the short-circuit curve, when the electron current ia = 2000
A, the field current if = 300 A
Find the rated current
In the short circuit curve, find the field current that will be
the rated current
Find the short...
Please explain in detail the
application of the RHR and why the electric field vectors are
acting at angles.
Problem 8 A uniform, square, conducting loop, 20.0 cm on a side, is placed in a magnetic field, which has an initial magnitude of 0.750 T. The magnetic field is directed into the plane of the diagram and is decreasing at the rate of-0.0350 T/s. The conducting loop has its side ac along a diameter and with point b at the...
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