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Low power factor leads to higher current in the system for the same real power requirement. (Check out the power triangle in any basic electical engg. book)
higher current leads to higher system losses for the supply & distribution companies, drop in voltage, also necessiates higher sizing of system components.
Hence low power factor attracts penalty also on the other hand some distribution companies provides incentives for maintaining higher pf.
Regards,
Sameer Shaikh
Wiki User
∙ 13y ago
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Why you use low power factor wattmeter on primary and unity power factor on secondary side of transformer?
There is no such thing as a 'low power-factor' wattmeter. A wattmeter always reads true power, regardless of the load's power factor.
Does low load in transformer lead to low power factor?
Power factor is determined by the nature (resistive, inductive, capacitive) of a load, not whether it is a low load or a high load.
Why inductor have low power factor?
An inductor has a low power factor because it is a reactive device, and the phase angle of the current with respect to voltage is not zero. In fact, power factor is the cosine of that phase angle, which means that a power factor of 1 means no phase angle, which means a resistive load. Anything else represents a reactive load and a power factor less than 1.In an ideal case, with perfect inductors and perfect conductors, the power factor would be zero, i.e. the phase angle would be 90 degrees lagging.
Why low power factor wattmeter is used for open circuit test of transformer?
For open circuit test of transformer, the secondary is open circuit and the circuit impedance is largely inductive due to the core impedance having high L as compared to R. hence the power factor is reduced, thus , we use low power factor wattmeters.
What is LPF?
LPF is Low power factor, which is used to calculate overall power in VA (voltamps) kind of like calculating overall power in watts.
Why you use low power factor wattmeter on primary and unity power factor on secondary side of transformer?
There is no such thing as a 'low power-factor' wattmeter. A wattmeter always reads true power, regardless of the load's power factor.
How much energy you can save by improving the power factor from 0.8 to 0.98?
None. Power factor improvement has no effect whatsoever in saving energy. <<>> What it can save you is money. A utility company will charge an additional cost on your regular bill for having a low power factor reading less than .92 depending on the type of service. It is billed as a surcharge to the addition cost of the bill. On three phase services this correction can be done by adding capacitance to bring the power factor up to .92.
What is low power factor watt meter?
A wattmeter reads the true power of a load, regardless of its power factor.
How does low power factor effects conductor size?
A load with a low power factor draws more load current than necessary, so the supply conductors need to have a greater cross-sectional area than would otherwise be necessary.
Does low load in transformer lead to low power factor?
Power factor is determined by the nature (resistive, inductive, capacitive) of a load, not whether it is a low load or a high load.
Why transformer power factor taken unity?
It isn't! A transformer operating at no load has a very low power factor.
What mean power factor 0.26 lead?
When looking at power factor, it is the ratio of watts (true power) to VA. The power factor is how we measure power systems. A person with a low power factor like .26 will have a higher electricity bill.
How do you build a capacitor bank to maximize electrical power?
capacitor bank make in delta connectionIf you are asking about improving the power factor to decrease the surcharge you pay for having a low power factor you have to go about it like this.Check your utility bill to find out what your existing power factor reading is. Power factor is the measure of how effectively your equipment converts electric current into useful power output.The ratio of your usable power consumption in kilowatts to your reactive power consumption in kilo-vars determine your power factor.When your power factor drops below 90%, a power factor surcharge is applied to cover the cost of supplying additional reactive power.This usually applies to industrial and commercial buildings that have large and many motor loads. Inductive reactance from motors can be opposed by capacitive reactance. Adding capacitors to the system will improve your power factor which will bring your reading up to over 90%.There are charts available where you can graph your existing reading and what you want to improve the power factor to. In the capacitor scale you are told how much capacitance has to be added to the system to get you to the higher reading.On very large motors capacitors are added on the load side of the magnetic contactor so that when the motor is in operation the capacitors are in the motor circuit and when the motor's magnetic contactor drops out the capacitors also drop out of the circuit.For chart see related links below
Why the value of power factor should be low?
no.... the power factor of any machine should be as near as to 1 when the power factor becomes near to 1 there is no need to the alternator to supply the reactive power.. but in general all most all the loads in the power system inductive in nature the power factor is becoming lagging(<1) so to avoid this the power generating companies and the govt. are recommending the people to have the capacitors at the load ends....... since the capacitive reactance can nullify the effect of the inductive reactance this will try to improve the power factor
What is the main reason for Low Power Factor?
inductive/lagging load
Why ac motor has low power factor?
because of high resistance in the load.
Why a rotor of an alternator at rated power dissipates more heat at a low power factor load than at a high power factor load?
at lower power factor current drawn by load is high and at higher pf the current drawn is less...
