0
Actually, alternators (synchronous generators in other parlance) are normally operated slightly saturated by design.
If they were operated completely unsaturated, the machine is not being used to its full capability.
We don't attempt to operate them beyond the knee, because the losses increase significantly, and the output voltage & current are distorted.
It is important to note that there are two different windings to consider when discussing saturation.
The DC field (rotor) winding is usually operated somewhat in the saturated region.
The AC armature (stator) winding is operated near - but below - the knee to avoid output distortion.
What else can I help you with?
Knee pont voltage- briefly distinguish?
The knee point voltage of a CT is the voltage at the "knee" of a I-V characteristic (if you increase voltage, and plot this voltage with respect to the current flow, you will see a logorithmic type response). The knee is usually specified as 10% distortion (ie, the voltage is 10% less than you would expect relative to the current flow). beyond the knee point, the CT is considered in saturation. This applies to amplifiers / transistors as well as CTs. Transistors used as ampifiers are operated in the "linear region", or the region below the knee point of that particular transistors I-V characteristic.
What is knee voltage and breakdown voltage?
Knee voltage (cut in voltage) :-The forward voltage at which the current through the P-N Junction starts increasing rapidly is called as Cut in voltage or knee voltage Breakdown voltage :-It is the minimum reverse voltage at which the P-N Junction can conduct without damage to the current
Is the working voltage of led is equal to it's knee voltage?
A: LED follows an exponential curve just like a regular diode. However their make up moves the forward voltage from 1.8 volts to 3.2 volts and higher this differs from a regular diode where is the forward voltage is around .6 to.7 volts. Because of the higher voltage across these devices they cannot dissipate much power.
What is meant by cut in voltage in diode?
Cut in voltage (Knee voltage): The forward voltage at which the current through the P-N Junction starts increasing rapidly is called as Cut in voltage or knee voltage.
Which type of diode having knee voltage of 0.7V to 0.3V?
Silicon = 0.7v : Germanium = 0.3v
Why an alternator do not operating near the knee of its saturation curve?
Efficiency drops off rapidly as you approach the knee of the saturation curve as energy is converted to heat rather than electricity.
Why dc voltage increased less rapidly as the dc current increases at three phase alternator?
if you mean in your question Why the generated voltage (AC voltage) increased less rapidly as the dc current increases at three phase alternator? the answer is: because the magntic material that used in the 3 phase alternator will reach to satruration case of producing the magnatic flux so will happen a knee saturation curve in (I dc) versus (E ac) curve. Engr. Emad
When is the Op-amp said to be working in its linear range?
When the slope of the output/input is a straight line, before the knee point. The knee point is where the slope dramatically changes from the linear region to saturation.
Is rey mysterio injured?
no but operate his left knee 5 times anyway he can beat batista
What does it means when we say-diode is specially designed to operate under reverse bias in breakdown region?
You are talking about a special type of diode called a zener diode which is designed, using special junction doping, to allow controllable reverse bias operation at a reduced breakdown voltage with a much sharper knee point curve than its normal forward breakdown curve. This allows the diode to be used as a voltage regulator. Normally, a diode's reverse breakdown curve is such that, at reverse breakdown, it avalanches and, without current limits in place, will self destruct. The zener diode, on the other hand, will operate in reverse much the same as it does in forward, just at a different voltage, and with a much sharper current to voltage curve, making it highly suitable as a voltage regulator.
How do you perform no load magnetizing current measurement of transformer?
I am sure there is more than one way of doing this but what I am currently implementing in my own study of I_mag is the following: At no load perform an over excitation test where you vary the input voltage from 0 V and monitor the current flowing through the primary windings of the transformer. Over-excite the transformer until the rate at which current, I_in increases in the primary windings is relatively larger than the change in Vout , across the secondary windings (this is the point of saturation). Plot your results of voltage Vout (y- axis) against current I_in (x-axis) and you should come up with a characteristic B-H curve. (Remember that the B field is proportional to voltage and the H field is proportional to current from magnetic circuits theory) You are then to decide which point on your curve you will regard as the 'knee' point or the point at which the curve starts to deviate from the linear region. This 'knee' point will correspond to your I_mag. While I_in is not necessarily equal to I_mag at no load, at the knee point on your curve these two currents will be approximately equal.
Knee pont voltage- briefly distinguish?
The knee point voltage of a CT is the voltage at the "knee" of a I-V characteristic (if you increase voltage, and plot this voltage with respect to the current flow, you will see a logorithmic type response). The knee is usually specified as 10% distortion (ie, the voltage is 10% less than you would expect relative to the current flow). beyond the knee point, the CT is considered in saturation. This applies to amplifiers / transistors as well as CTs. Transistors used as ampifiers are operated in the "linear region", or the region below the knee point of that particular transistors I-V characteristic.
How do they fix hardware loosening of a total knee replacement?
Typically they will have to re-operate, and replace the implant with either a slightly larger implant, or more cement.
Is there a fuse that can knock out the alternator on a 1990 Prelude SI Where is it?
Actually, Honda Preludes are one of the few cars that have alternator fuses. It's either in the fuse compartment under the hood or by your left knee when you're in the driver's seat. Mine blew last year and i replaced the whole alternator only to find out all I needed was a fuse. Good luck!
What is knee poit volt and what is c t saturation?
It is the maximum voltage across the secondary terminals beyond which a CT will saturate when it is loaded.If the CT gets saturated,the ratio of primary current to the secondary current will not be to the designed value.
Function of hinges joint?
The hinge joints operate around one particular axis like the door of your room. You have the elbow and knee joints as the examples of hinge joints.
Characteristics of curve of an ideal diode with diagram?
0V forward bias knee voltage0 ohm forward bias resistance0A reverse bias currentinfinite ohm reverse bias resistanceno parasitic capacitance or inductance
