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What are the disadvantages of leading power factor on generator supply system?
Wiki User
∙ 11y ago
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.
Wiki User
∙ 11y ago
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Can we improve generator power factor for increasing active power?
The 0.8 Power Factor provided by generator manufacturers is not the load power factor, but it is the nominal power factor used to calculate the kW output of an engine to supply the power for a particular alternator kVA output. Alternators are therefore designed to supply their rated kVA at 0.8 lagging power factor.
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.
Is it desirable to have leading power factor loads?
Obviously, it is always desirable to have leading power factor loads so that the power factor of system can be kept leading.Leading power factor reduce losses and increases the efficiency of the system.WhatIn a non-corrected (leading OR lagging system), the load uses true power, but the generator must supply apparent power. Apparent power may be greater than real power, but can never be less. They are *equal* with a purely resitive load, and this gives a power factor of exactly 1.0, and is neither leading NOR laggingThe extreme example of a lagging system would be a capacitor drawing 10 amps on a 240 volt supply. The generator must supply 10 x 240 = 2400 watts of power, but the capacitor will actually dissipate *none* of this. We have a system with ZERO percent efficiency. 100 x (0/2400 = 0)The other extreme is an electric radiator that is purely resitive with a 10 amp current drain. It would demand 2400 watts from the generator and absorb all of it, producing 2400 watts of heating. Efficiency is 100 percent.Your "leading" system, such as a motor, would demand, say 2800 watts from the generator to deliver only 2400 watts of useful output energy (assuming the motor's mechanism is 100% efficient). Your leading system would have an efficiency of 100 x (2400/2800) = 85.7%.ANY system that has a leading or lagging power factor (a value less than 1.0) is going to be less than 100% efficient.Inductive (leaing) loads such as motors and fluorescent lights will often have capacitors connected across them to apply a lagging correction equal to their leading power factor and to correct the system back to a PF = 1.0.
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.
Power factor lead or lag?
By definition, the terms 'leading' and 'lagging' refer to what the load current is doing with respect to the supply voltage. So, for a 'lagging power factor', it is the current that is lagging.
What the negative and positive sign shows for power factor?
Applying a negative or positive sign to power factor is an obsolete method of describing whether it is 'leading' or 'lagging'. We no longer do this. These days, a 'leading power factor' indicates that the load is capacitive and the load current is leading the supply voltage, and a 'lagging power factor' indicates that the load is inductive, and the load current is lagging the supply voltage. Having said that, a 'negative' power factor is also the mathematical consequence of 'negative power' -i.e. the direction of power when it is fed from the load back to the supply (e.g. when the grid feeds energy into a generator, causing it to 'motor'). In this case, the power factor isn't really negative, but simply appears to be so.
Can we improve generator power factor for increasing active power?
The 0.8 Power Factor provided by generator manufacturers is not the load power factor, but it is the nominal power factor used to calculate the kW output of an engine to supply the power for a particular alternator kVA output. Alternators are therefore designed to supply their rated kVA at 0.8 lagging power factor.
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 is the function of capacitor in an electric generator?
In an electric generator, the function of a capacitor is to provide reactive power and improve the power factor of the generator. When a generator is connected to a load, the load may have a combination of resistive, inductive, and capacitive components. Inductive loads can cause the power factor of the generator to decrease, resulting in lower efficiency and voltage regulation. By adding a capacitor in parallel with the generator, the reactive power generated by the capacitor can offset the reactive power of the inductive load, leading to improved power factor correction. This helps to enhance the efficiency of power transfer and stabilizes the voltage. The capacitor absorbs and supplies reactive power, reducing the strain on the generator and ensuring a steady and efficient supply of electrical energy.
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'.
Is it desirable to have leading power factor loads?
Obviously, it is always desirable to have leading power factor loads so that the power factor of system can be kept leading.Leading power factor reduce losses and increases the efficiency of the system.WhatIn a non-corrected (leading OR lagging system), the load uses true power, but the generator must supply apparent power. Apparent power may be greater than real power, but can never be less. They are *equal* with a purely resitive load, and this gives a power factor of exactly 1.0, and is neither leading NOR laggingThe extreme example of a lagging system would be a capacitor drawing 10 amps on a 240 volt supply. The generator must supply 10 x 240 = 2400 watts of power, but the capacitor will actually dissipate *none* of this. We have a system with ZERO percent efficiency. 100 x (0/2400 = 0)The other extreme is an electric radiator that is purely resitive with a 10 amp current drain. It would demand 2400 watts from the generator and absorb all of it, producing 2400 watts of heating. Efficiency is 100 percent.Your "leading" system, such as a motor, would demand, say 2800 watts from the generator to deliver only 2400 watts of useful output energy (assuming the motor's mechanism is 100% efficient). Your leading system would have an efficiency of 100 x (2400/2800) = 85.7%.ANY system that has a leading or lagging power factor (a value less than 1.0) is going to be less than 100% efficient.Inductive (leaing) loads such as motors and fluorescent lights will often have capacitors connected across them to apply a lagging correction equal to their leading power factor and to correct the system back to a PF = 1.0.
Can be the power factor become negative reading?
Yes, power factor can be negative. That is the case of a generator. Power factor is the cosine of the phase angle between voltage and current, and the cosine can be positive or negative.AnswerNo. Power factor can be 'leading' or 'lagging', but it cannot be 'negative' or 'positive'.
What is the inter lock used for main power supply and generator supply?
The interlock is used to prevent the service supply and the generator supply from being inadvertently paralleled to each other.
What will happen of you give AC supply to stator winding of DC generator?
why the supply is given to the stator of dc generator give answer
If 2kw generator is supplied to 10 ampere load how much will be its power factor?
The 10 A in the load includes the real power and the reactive power, if it is a single phase 120 V generator it can supply 16.67 A; that means a 2000 KW load at a power factor of 1.00, of for example a 1600 W load at a power factor of 0.80, in both cases the output current of the generator will be 16.67 Ampers, it is the same with the 10 A load, the power factor is included in the supplied current.Rosa María Valdespino.
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 if commutator of DC generator is removed?
If the commutator is removed from your generator, you (if you connect slip rings) get AC supply instead of DC supply. the function of the commutator is to convert AC to DC supply and vice versa.Additional AnswerRemoving the commutator will also prevent you from connecting the output of the generator to its load. Remember, the generator's armature is spinning!
