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Low power factor means higher than necessary load currents. These require unnecessary expenditure on the amount of copper in supply equipment such as cables, Transformers, and switchgear. Higher than necessary load currents also mean greater voltage drops and poorer voltage regulation.

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12y ago
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12y ago

The adverse effects of low power factor are:

  • over consumpsion of reactive energy
  • high input current
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10y ago

advantages of low power factor

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Q: What are the adverse effects of poor power factor?
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When induction motors is used for power factor correction what is called?

I'm not sure I've ever seen an induction motor used to correct power factor; it is usually the induction motors that are causing the poor power factor. "Power factor correction" is usually accomplished by adding capacitors to the system to counteract the inductance of large motors.


How does poor power factor effect the supply system?

'Poor power factor' means that a load is drawing more load current is necessary for the amount of energy it consumes. The result is larger voltage drops along the supply lines and greater energy losses along those same lines. To overcome these problems, it would be necessary to install cables and other equipment with larger cross-sectional areas -this is expensive, so it's much easier and cheaper to improve the load's power factor. To encourage consumers to do so, utility companies include a surcharge if the power factor falls below a certain value. All of this only applies to industrial/commercial loads, it does NOT apply to residential loads.Poor power factor has the following effects on the power supply:High input currentover consumption of reactive energyIncrease in the cross sectional area of conductors


Why can a reactive power load drop the voltage more than the active power load in a transmission line?

A load with a poor power factor draws extra current from the power supply, meaning that there will be more of a voltage-drop in the supply. As an example, if the load is 6 kW on a 240 v supply, the current drawn is 25 amps if the load has a power factor of 1. The kVA is equal to the kW. But if the load has a power factor of 0.8 it needs to draw 7.5 kVA for a power of 6 kW, which is a current of 31.25 amps, so there is more of a demand on the power supply wiring etc. The transmission losses increase by 56% with the extra current. In both cases the customer is charged for power used, 6 kW. That is why the supply companies do not like loads with a poor power factor and sometimes charge commercial customers more for a poor power factor. That in turn makes it viable for the customers to correct the power factor of the load they place on the supply.


Power factor correction capacitors?

Yes, they exist. Capacitors are often used to change a low power factor (such as 0.5) to a higher power factor near unity (1). In some instances, this will lower fees and costs to utilities. In homes, this is not really necessary as most devices used in homes are near unity power factor, or tend to be minor/sporadic loads (such as a washing machine).


Why unity power factor is used in load test?

When power factor is at unity, the voltage and current waves are aligned or in phase with one another. Since power is the product of voltage and current, power transfer is maximized at unity power factor. When power is transmitted at a lower power factor, greater current is required to deliver the same amount of power. When current is increased, the size of the transmission, distribution and generation systems, all have to be increased accordingly, along with the price of the killowatt-hour at the meter.

Related questions

What are the adverse effects of letting poor people poach?

Possible species extinction because of over-poaching.


Why unity power factor is not economical?

If you have a poor power factor (say .8), and your local utility requires you to have .95pf or better, or be charged extra due to the poor power factor, there is no economic reason to buy more equipment to bump your power factor up to 1.0 as opposed to .95. Once you're above .95, you're just fining yourself.


Can motor overheat be caused by poor power factor correction?

yes it doesent


What is the meaning of poor power factor?

Power factor is the cosine of angle between voltage and current that we all know. And the power factor should be unity or close to unity. Unless if we have the power factor not close to unity or far away from unity is called poor power factor. This termed as poor because it will take large amount of current for the given power. If the large amount of current is drawn from the substation or anything else then the line loss will increase. Line loss is (I^2)R loss. So the current increase line loss will also be increased. So as to avoid such losses every industry should maintain their power factor(Normally in every Industry they maintain .9 and above). Those who are not maintaining power factor will be fined.


Why you are using capacitor banks to improve power factor?

A poor power factor is caused by inductive loads or electronic devices. These loads cause excess current to flow in the circuit reducing the efficiency. Inductive devices are considered to be a "load" for reactive power. Reactive power does not actually do any real work by is required to develop magnetic fields. Capacitors are considered to be "sources" of reactive power. So these capacitors will supply the reactive power to the inductive loads instead of the utility supplying this power. This is why capacitors are used to improve a poor or low power factor. This is just a very brief description on this topic. Power factor correction is becoming a very complex topic with more and more poor power factor loads being used every day.


What is the effect of poor power factor?

See discussion page before answering then delete this line.


When induction motors is used for power factor correction what is called?

I'm not sure I've ever seen an induction motor used to correct power factor; it is usually the induction motors that are causing the poor power factor. "Power factor correction" is usually accomplished by adding capacitors to the system to counteract the inductance of large motors.


Why the induction motor power factor is poor at no laod?

If the power demand is lower than that, you still have to setup the magnetic fields as if you were going to supply that maximum power


What is the definition of adverse remortage?

An adverse remortgage is the application of adverse credit in place of standard credit to the mortgage borrower. This application allows these individuals with poor credit to possibly refinance.


How does power factor affect your power bill?

A poor power factor causes the meter to rotate more slowly than it should, so a poor power factor would reduce your bill. Electric utilities compensate for this in commercial services by billing based on power factor, or they install a meter that actually measures power factor.AnswerEnergy meters 'read' the in-phase component of load current (therefore the load's 'true power' multiplied by time) and, so, are completely unaffected by the power factor of a load. So the power factor of a residential load will have absolutely no effect whatsoever on that residence's 'energy' (not 'power') bill.Industrial and commercial consumers are billed for 'demand' (their rate of consumption of energy -i.e. the power) as well as energy supplied'. In addition, these consumers are usually penalised if the power factor of their load falls below an agreed value. So power factor does affect the overall bill (but not the energy bill) of industrial consumers.


How does poor power factor effect the supply system?

'Poor power factor' means that a load is drawing more load current is necessary for the amount of energy it consumes. The result is larger voltage drops along the supply lines and greater energy losses along those same lines. To overcome these problems, it would be necessary to install cables and other equipment with larger cross-sectional areas -this is expensive, so it's much easier and cheaper to improve the load's power factor. To encourage consumers to do so, utility companies include a surcharge if the power factor falls below a certain value. All of this only applies to industrial/commercial loads, it does NOT apply to residential loads.Poor power factor has the following effects on the power supply:High input currentover consumption of reactive energyIncrease in the cross sectional area of conductors


How many kw in 70kav?

The power in watts equals the VA times the power factor. For a resistive load like a convector heater or an iron the power factor is 1 For other things like motors the power factor might be 0.7. A poor power factor is not a good thing because more current is needed from the supply to produce a given amount of power, so that requires thicker wires (more expensive). For a power factor of 1, 70 kVA = 70 kW For a power factor of 0.7, 70 kVA = 50 kW.