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When you have a Power Factor less than 1 the voltage and current waveforms in an AC circuit are out of phase. Therefore at any given instant of time the work being done or energy being expended is calculated by multiplying the current x voltage. This reduces the wattage at any instant of time. When the Power Factor is one the instantaneous multiplication of the current and voltage would yield the maximum value with the waveforms in phase. This is much easier to see with a picture, but imagine a square wave for both voltage and current. Say for half the cycle the current is 2A and Voltage 3V and for the second half of the cycle both are zero. So for 1/2 the cycle the watts generated are 6 watts and zero for the second half of the cycle. Now if the two waveforms were 180 degrees out of phase the voltage would be zero when the current was 2A and the current would be zero when the voltage was 3V for zero watts. In this case the Power Factor would be zero.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoAny time the power factor is less than 1, whether it is leading or lagging, the efficiency is less than optimal. As power factor declines, more power is required to do the same amount of work. Leading or lagging simply refers to the load being more capacitive or inductive. The disadvantage of a lagging power factor is that the load is highly inductive. Where power factor declines, greater losses are registered in the generation/distribution/transmission areas.
CommentPower factor has nothing to do with efficiency. As power factor reduces, the true power of the circuit is unaffected, while the apparent power increases. The operation of load devices, such as motors, are completely unaffected.
Wiki User
∙ 11y agoLeading power factor results in higher receiving end voltage, which again results in increased power loss in Transformers & Cables same as lagging power factor.
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What are the disadvantages of leading power factor on generator supply system?
in case of leading power factor the air gap flux inside the alternator will increase which may cause over heating of the stator end coil and overhang portions.
What are the advantages and disadvantages of unity power factor?
There is no disadvantage of unity power factor, because at unity power factor all the electrical power is efficiently utilized by the the load, and at lagging power factor some power is lost in the load's magneticfield.
What are the advntage of the leading power factor?
A leading power factor means that the current is leading the voltage. That means that in the AC cycle (50 or 60 Hz) the current reaches its peak before the voltage. The amount of phase-lead can be up to 90 degrees which means one quarter cycle, or 5 milliseconds in a 50 Hz system.
What happens when lagging Power Factor changes to leading PF?
when lagging Power Factor changes to leading PF, then the voltage across the circuit in which capacitor bank is connected, is increased.
What does zero leading power factor mean?
A 'leading' power factor indicates that the load current is leading the supply voltage. Since power factor is the cosine of the angle by which the load current either leads or lags the supply voltage (i.e. the load's phase angle), a cosine of 0 corresponds to a phase angle of 90 degrees. So, a power factor of 0 (leading) indicates that the load current is leading the supply voltage by 90 degrees, which means that the load must be purely capacitive.
What are the disadvantages of leading power factor on generator supply system?
in case of leading power factor the air gap flux inside the alternator will increase which may cause over heating of the stator end coil and overhang portions.
Leading and lagging power factor?
The terms, 'leading' and 'lagging' refer to what the load current is doing, relative to the supply voltage (Phase difference) -never the other way around. If the current is leading the voltage, then the power factor is 'leading'; if the current is lagging the voltage, then the power factor is 'lagging'.
What types of loads have a leading power factor?
Capacitive loads have a leading power factor. Current leads voltage when there is capacitive reactance. (The opposite is inductive, which is lagging.)
What are the advntage of the leading power factor?
A leading power factor means that the current is leading the voltage. That means that in the AC cycle (50 or 60 Hz) the current reaches its peak before the voltage. The amount of phase-lead can be up to 90 degrees which means one quarter cycle, or 5 milliseconds in a 50 Hz system.
What are the advantages and disadvantages of unity power factor?
There is no disadvantage of unity power factor, because at unity power factor all the electrical power is efficiently utilized by the the load, and at lagging power factor some power is lost in the load's magneticfield.
What happens when lagging Power Factor changes to leading PF?
when lagging Power Factor changes to leading PF, then the voltage across the circuit in which capacitor bank is connected, is increased.
What will happed if power factor is .9 leading . what will be the impect on motors?
A motor will never have a leading pf.
What does zero leading power factor mean?
A 'leading' power factor indicates that the load current is leading the supply voltage. Since power factor is the cosine of the angle by which the load current either leads or lags the supply voltage (i.e. the load's phase angle), a cosine of 0 corresponds to a phase angle of 90 degrees. So, a power factor of 0 (leading) indicates that the load current is leading the supply voltage by 90 degrees, which means that the load must be purely capacitive.
What condition you get negative regulation for transformer?
When its load has a leading power factor.
Which power factor is advantage lagging or leading and why?
A lagging power factor is caused by inductive reactance, which is composed of resistance and inductance -- and the resistance component lowers the supply volts. A leading power factor provides capacitive reactance that actually helps improve source voltage -- this helps motor loads run cooler.
Is it possible to transmit power with leading power factor?
The power factor depends on the properties of the load, and if any power factor correction is done it has to happen at the load, so that the current in the transmission lines is reduced. Correcting the power factor at the sending end fails to address the problem.
What does a negative value for a reactive power means?
Meaning it's a capacitive load. Leading power factor
