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Power factor occurs because we switched from DC to AC. In earlier days we used DC and then after invention AC there occurs power factor. Because in DC there is no frequency and there will be no angle difference between voltage and current. But in case of AC there is frequency and there may be some angle between Voltage and Current. But if we use pure Resistive elements there will not be angle difference. But in most of the industrial process, the loads are inductive(majority) So there will some angle difference between voltage and current and this leads to power factor since we know that power factor is a cosine angle between voltage and current.
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∙ 11y ago
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∙ 12y agoThe load will draw a greater current than necessary. This means the cables, etc., supplying that load will have to have a greater cross-sectional area, therefore cost, than necessary.
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∙ 14y agoA lower p.f means more total current for a given power dissipation. A larger source is required to deliver the true power.so it have high VA rating. It requires large diameter of wire size.
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∙ 13y agoPower factor can range from zero to one. When the current and voltage waveforms are out of phase you get a value less than one. This is usually caused by motors and other inductive loads.
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∙ 12y agoZero power factor occurs when the load current is in phase with the supply voltage.
when the load current is in 90 lag gives zero power p=vicos90===
p=0
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∙ 6y agoIf the load is capactive then power factor tends to be leading
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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.
Why does the terminal voltage increase in leading load?
due to decrease in power factor
When you should use synchronous motor instead of capacitor for power factor correction?
Synchronous motors show some interesting properties, which finds applications in power factor correction. The synchronous motor can be run at lagging, unity or leading power factor. The control is with the field excitation, as described below:When the field excitation voltage is decreased, the motor runs in lagging power factor. The power factor by which the motor lags varies directly with the drop in excitation voltage. This condition is called under-excitation.When the field excitation voltage is made equal to the rated voltage, the motor runs at unity power factor.When the field excitation voltage is increased above the rated voltage, the motor runs at leading power factor. And the power factor by which the motor leads varies directly with the increase in field excitation voltage. This condition is called over-excitation.The most basic property of sycho motor is that it can be use as a CAPACITOR OR INDUCTOR both. Hence in turn it improves the power factor of system.The leading power factor operation of synchronous motor finds application in power factor correction. Normally, all the loads connected to the power supply grid run in lagging power factor, which increases reactive power consumption in the grid, thus contributing to additional losses. In such cases, a synchronous motor with no load is connected to the grid and is run over-excited, so that the leading power factor created by synchronous motor compensates the existing lagging power factor in the grid and the overall power factor is brought close to 1 (unity power factor). If unity power factor is maintained in a grid, reactive power losses diminish to zero, increasing the efficiency of the grid. This operation of synchronous motor in over-excited mode to correct the power factor is sometimes called as Synchronous_condenser.
What is meant by leading and lagging pf?
Power Factor is the ratio of true vs apparent power, and comes into play with a reactive (inductive or capacitive) load. A purely resistive load, such as a light bulb or toaster, will have a power factor of 1 because the current is in phase with the voltage. An inductive load, however, such as a motor, will have a power factor less than 1 because the current lags the voltage. You could also have a capacitive load, with a power factor less than 1, but in this case the current leads the voltage.AnswerThe terms, 'leading' and 'lagging' refer to whether a circuit's load current is leading or lagging the supply voltage. Current will 'lead' in resistive-capacitive (R-C) circuits, and 'lag' in resistive-inductive (R-L) circuits. So, a 'leading power factor' indicates a leading current, and applies to R-C circuits, while a 'lagging power factor' indicates a lagging current, and applies to R-L circuits.
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 type of error factor is the leading cause of accidents?
Distracted driving is the leading cause of motor vehicle accidents.
What type of factor or error is the leading cause of accident?
Distracted driving is the leading cause of motor vehicle accidents.
What is type of error or factor is the leading cause of accidents?
Distracted driving is the leading cause of motor vehicle accidents.
What type of error factor is the leading cause of accident?
Distracted driving is the leading cause of motor vehicle accidents.
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 type of error or factor is the leading cause of accidents?
Distracted driving is the leading cause of motor vehicle accidents.
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.
