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Pf is the symbol for Power Factor.
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∙ 15y ago
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How do you draw phase diagram for transformer operating at load with lagging PF and leading PF?
In order to draw the phase diagram for transformer operating at load with lagging PF and leading PF, you will need to know the equation for the transformer being load free. This constant will help you with the load bearing equation of Np/Ns=Vp/Vs=Is/Ip.
What will be the power factor if the load is non linear?
Non-linear loads such as VFD drives and other rectifier power supplies usually cause a leading PF, similar to a capacitively reactive load. Many power supplies nowadays, like IT (computer) power supplies are PF corrected, BUT, when they are not loaded to full capacity they still cause a leading PF. Apparently the correction is only accurate at full load.
What is effect of power factor on the readings of wattmeter?
If you are asking whether power-factor improvement has any effect on a wattmeter reading, then the answer is no, it doesn't. Improving the power factor of a load has absolutely no effect on the power of the load, but it can act to reduce the value of the load current.
What is the Relationship between power factor and current?
When voltage and current waveforms are out of synch the power factor is reduced. In a pure resistance load the PF is 1. When inductance and capacitance is involved the PF is from 0 to 1.
What is Fla on motor nameplate?
FLA: Full Load Ampere. Its the current drawn by the motor when the motor is running at full load FLA = kW / (1.732*V*pf*efficiency*100)
How do you draw phase diagram for transformer operating at load with lagging PF and leading PF?
In order to draw the phase diagram for transformer operating at load with lagging PF and leading PF, you will need to know the equation for the transformer being load free. This constant will help you with the load bearing equation of Np/Ns=Vp/Vs=Is/Ip.
In a circuit with resistive and inductive load what happens to the power factor as the resistive load increases?
The PF will increase
Why is the PF of an induction motor low for light loads?
Induction motor by design is inductive load. Hence the PF tends to be lower
How do you convert mw to mva?
You would have to know the Power Factor, normally designated PF. MVA x PF = MW. If the PF is unity then MVA = MW. A PF of UNITY suggest the load is purely resistive with neither capacitive nor inductive components in the load or source. Of course this can mean such components have been balanced artificially.
What is the output watts when generator producing 415volts at 800amps load?
415*800*pf
What will be the power factor if the load is non linear?
Non-linear loads such as VFD drives and other rectifier power supplies usually cause a leading PF, similar to a capacitively reactive load. Many power supplies nowadays, like IT (computer) power supplies are PF corrected, BUT, when they are not loaded to full capacity they still cause a leading PF. Apparently the correction is only accurate at full load.
16 kw at 400v with pf 0.8 full load current?
You need to use this formula I = kW/1.73 x Volts x % Eff x pf.
What is effect of power factor on the readings of wattmeter?
If you are asking whether power-factor improvement has any effect on a wattmeter reading, then the answer is no, it doesn't. Improving the power factor of a load has absolutely no effect on the power of the load, but it can act to reduce the value of the load current.
How does power factor correction solve the problems caused by inductive loading?
You calculate power by multiplying voltage x current x Power Factor (PF). PF = 1 for a resistive load so you essentially convert maximum power with a resistive load. With an inductive load the PF decreases from 1 toward zero. Hence the lower the power factor the less efficient the system. This reduced PF is caused by the current and voltage sine waves being out of phase. If they are 180 degrees out of phase you have zero PF. PF correction involves circuitry that basically helps "tune" the circuit to reduce the lag. Capacitors are involved heavily in this process to tune the circuit.
How do you know the required power factor?
Power factor (PF) varies between 1 and zero. It is 1 for a pure resistive load. The closer to one the more efficient the system. Hence the ideal is to get PF to one. This isn't possible with an inductive load which causes current and voltage to be out of phase. Various circuits are used to try and correct PF to 1 to increase efficiency.
How can fluctuation in power factor be improved in single operating generator due to change in loads?
Power factor correction is normally done with a single capacitor bank. If the PF fluctuates due to a change in load, the best solution is to design and fit power factor correction capacitors at each individual reactive load that may start or stop during normal operation. Connect the PF correction directly accross the load, such that when the starter or disconnect is open, the load AND the capacitor is removed from the line, and when the disconnect is closed, both the load AND the PF capacitor is energized. Continuous loads can still be bulk-corrected with a capacitor bank, this will minimize the number of individual correction capacitors you will have to design. If properly done, your PF can be made to be very stable, with little change as the load varies.
What is non inductive load?
non- inductive load is without motor and transformer loads are non-inductive load, purely resistive are capacitive loads phase angle is unity are leading PF A non-inductive load is a load whose current does not change instantaneously.
