0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
Where does the voltage that is necessary for field excitation on the rotor originates from?
The excitation current is provided by a small self-excited pilot generator, attached to the same shaft as the alternator's rotor.
Does buttressed mean the same thing as reinforced?
Yes, they can mean the same thing.
Why gas turbine is trip on excitation failure?
The excitation system puts the load on the generator, so if it fails, the generator is liable to overspeed. Think of it as the gears on a bicycle, where your legs are the power source, the gearing is the excitation system. If you're riding along, and suddenly your gears fall off, your legs will start to move very fast. You might hyper extend your knee, your foot might slip off the medal, you could hurt yourself in a bunch of different ways because you expect the resistance to be there and it is suddenly gone. The same applies to a generator - it's designed to run at specific speeds. Going significantly faster can cause all kinds of problems.
Why terminal voltage of the self-excited shunt generator lower than that of the separately excited shunt generato?
Some generators are self excited; this means their terminal voltage is fed back to the excitation system to supply power to the rotor of the generator (which makes it into an electromagnet); the more power that is fed back, the stronger the electromagnet becomes, which makes it harder to turn the generator, which causes the generator to push out more power (simplified, really quick version). If there is a fault electrically near the terminal of a self excited generator, the terminal voltage will sage to near zero; this means the voltage supplied to the excitation system will drop by the same percentage (say the terminal voltage is 30% of what it should be, then the maximum supplied voltage to the excitation system drops to 30% of what it normally is, since P = V*I). Since the input power is less, the output of the generator will decrease (current will decrease). The terminal voltage is determined by the impedance between the generator and the fault such that V = I*Z; As I decreases, V will also continue to fall, causing the terminal voltage to sag even more. A non-self excited generator gets its' excitation power from the grid, specifically from a location that is electrically separated from its' terminal voltage. If the terminal voltage sagged to 30% (same fault location as above example), the excitation system voltage may be impacted slightly (say 2%) so the excitation system power is near maximum (98% for this example). Since the excitation system is much farther removed from the terminal voltage, it is not dependent upon it, thus the terminal voltage will not continue to sag as with a self excited system.
When you rotate the handle of the electric generator faster does it deliver more less or the same voltage?
The speed of a generator only effects the frequency. Most generators operate at 1800 RPM. The output voltage is controlled by varying the field excitation voltage.
In synchronous motor theory is excitation current the same as field current?
yes. excitation current is same as field current to my knowledge
Where does the voltage that is necessary for field excitation on the rotor originates from?
The excitation current is provided by a small self-excited pilot generator, attached to the same shaft as the alternator's rotor.
Is master-vision harmful to health?
Excess of anything is harmful . If you are gating excitation from inside and do this, than no problem. But one think, if you are doing the same thing again and again and it becomes your habit then your habit will bound you to do this again and again. this is the bed thing
Why does excitation energy increase down the group for 1st group alkali metals?
Excitation energy for any 2 atoms is compared only for those electrons in the same energy shell.so as we go down the group the energy required to promote the electron in the same orbit to highest possible energy state increases due to the increase in effective nuclear charge
Are average and range the same thing?
No, they are not the same thing. Mean and average are the same thing.
What is synchronous impedance?
Synchronous impedance is also known as the EMF method. It is a ratio of open circuits to short circuits, when they both are referred to the same field excitation.
As much as things change they stay the same?
This phrase suggests that despite appearances, certain fundamental aspects remain constant. It reflects the idea that while there may be advancements or changes in various areas, underlying themes or patterns often persist in our lives or society.
What is another word for and she did the same thing?
the same thing she did
Are motion and distance the same thing?
No they are not the same thing
Are energy and work the same thing?
no it is not the same thing.
Is nick and Nickelodeon the same thing?
Yes, they are the same thing.
Is growing and making the same thing?
Yes they are the same thing
