0
There are two types of power - real power and reactive power. Real power is power that is used, such as the power used to light a light bulb. Reacitve power is power that is held and released by a reactive element (capacitor or inductor), thus is not actually used to do any work. The reactive elements cause a phase shift between voltage and current, which manifests itself as a change in power factor.
Power companies must supply both reactive and active power. Total power is equivalent to sqrt( Reactive^2 + active^2). Not only do they need to supply the reactive power, their equipment must be sized to handle a larger total power. Reactive power is generated by installing extra equipment - capacitor banks or inductor banks - or by running generation in such a way that more reactive power is created (this will lower the power plants' real power output).
Depending on who the customer is, they may not be billed for the reactive power, thus the oversizing of equipment, and the supplying of reactive power does not generate any revenue (but costs them). If power factor is bad enough, the power company will lose money, and thus require power factor correction, or will bill on both real and reactive power usage.
It's simple economics (money)!
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoA poor power factor is typically the result of inductive load. Capacitors cause the opposite effect of inductors, so placing them in parallel with inductive loads will counteract the effects of the inductive load, bringing power factor closer to unity.
Wiki User
∙ 12y agoLow power factor results in the need to oversize equipment to supply the extra current. Either the power company will take care of this, and charge you a premium for the extra current (aften as a higher cost per kWh you use), or you can take care of it locally by adding pf correction equipment.
Wiki User
∙ 12y agoThis is an angle b/w the voltage and current.
If the load current is taking (IL) the angle b/w the V/I vary by load current.
The PF led in the capacitors.
Lag in inductors.
Unit in resistor.
Our load's all mostly inductive,so we need im improving the PF.
Wiki User
∙ 11y agoAnswer
By drawing a current that is in antiphase (opposite sense) with the current drawn by the inductive component of the load, thus reducing the amount of load current drawn.
Wiki User
∙ 11y agoA capacitor draws a leading current which is in anti-phase to the current drawn by the inductive component of the load, and the resulting load current will therefore be closer to being in phase with the supply voltage, thus reducing the phase angle or improving the power factor (cosine of the phase angle).
Wiki User
∙ 13y agoBecause most power factor problems are a result of an overly inductive circuit. Capacitance is the opposite of inductance, and thus cancels out the excessive inductance.
Wiki User
∙ 12y agoA capacitor is connected across the line voltage to improve the power factor.
Add your answer:
Earn +20 pts
How the capacitor valve calculate for a for a load?
I assume that you are asking how to calculate the 'value' of a capacitor? Well, it depends what it is used for. If, for example, it is used to improve the power factor of a load, then it is first necessary to determine what the load's existing reactive power is; then, you need to know what reactive power is necessary with the power factor at its desired value; finally you need to difference between the actual and the desired values of reactive power -and this will be the necessary value for the capacitor. Power factor correction capacitors are rated in reactive volt amperes, not farads.
Why you take 0.95 as standard power factor?
When you need to calculate the estimated load or load current during initial design phase or so, you need to assume a value for power factor which is realistic. 0.95 is a realistic value.
What is the importance of power factor?
Power factor improvement means the power factor has been made closer to 1. If a power station delivers energy to places where the load is significantly reactive (contains capacitative or inductive components) it is expensive for them because they deliver current which actually doesn't do any work. The cosine of the phase angle between voltage and current is the power factor.
How much can you power on a 2.5kva generator?
It can supply 2.5 kW to a load with a power factor of 1. Otherwise the power available must be multiplied by the power factor which is always less than 1. If uncertain assume 0.8 which makes it 2 kW.
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.
How the capacitor valve calculate for a for a load?
I assume that you are asking how to calculate the 'value' of a capacitor? Well, it depends what it is used for. If, for example, it is used to improve the power factor of a load, then it is first necessary to determine what the load's existing reactive power is; then, you need to know what reactive power is necessary with the power factor at its desired value; finally you need to difference between the actual and the desired values of reactive power -and this will be the necessary value for the capacitor. Power factor correction capacitors are rated in reactive volt amperes, not farads.
What is automatic power factor correction panel?
Most of the commercial and Industrial installations have large electrical loads which are severely inductive in nature, such as motors, large machines, air conditioners, drivers etc. Which results in a severely lagging power factor. This means loss and wastageof energy and heavy penalties by electricity boards. In case of fixed loads this can be taken care by manual switching of capacitors.However in case of rapidly varying and scattered loads it becomes difficult to maintain a high power factor by manually switching on/off the capacitors in proportion to variation of load within an installation. This drawback is overcome by using an APFC panel (Automatic Power Factor Correction Panel) which not only maintains a high power factor but also eliminates the eliminates the need for constant manual intervention.The ratio of Active Power to Apparent Power is called Power Factor (PC) :Power Factor = Active Power/ Apparent Power = KW/KVAIf you want to know more about PFC panels please visit www.powerfactorcorrector.com or email me on info@urjaghar.com.
How do you do factor fireworks problems in math?
Can somerone please explain how to do a factor fireworks problem? I am completely lost on how they work. I need two different factor fireworks of 64.
How we can improve the power factor?
A poor power factor that occurs when a load draws a lagging current is corrected by the addition of a parallel capacitor to draw a leading current. If the load draws a leading current, an inductor in parallel would be used. In each case the added component is chosen to draw the same number of VARs as the original load. Some loads like TV sets have a poor power factor that arises from harmonic currents in the load, and this method is not amenable to correction by an added component. Power-factor correction is not normally carried out in domestic supplies.
What is important when measuring power?
To measure power, you need the Voltage, and Current. In the case of AC you need the number of phases, and the power factor. Once you have these, you can find the proper formula.
How many amps will a 3 phase 380 volt 11Kw motor draw?
In order to answer this question, you need to know (a) its efficiency, and (b) its power factor at full load. 11 kW (not 'Kw') is its output power, so you need to know its efficiency in order to determine its input power. Then, because, for a three-phase system, power is equal to 1.732 times the product of the line voltage, line current, and power factor, you also need to know its power factor.
Why you take 0.95 as standard power factor?
When you need to calculate the estimated load or load current during initial design phase or so, you need to assume a value for power factor which is realistic. 0.95 is a realistic value.
Power factor for pure resistive circuit?
ratio between true power and apparent power is called the power factor for a circuit Power factor =true power/apparent power also we conclude PF=power dissipated / actual power in pure resistive circuit if total resistance is made zero power factor will be zero
What is the importance of power factor?
Power factor improvement means the power factor has been made closer to 1. If a power station delivers energy to places where the load is significantly reactive (contains capacitative or inductive components) it is expensive for them because they deliver current which actually doesn't do any work. The cosine of the phase angle between voltage and current is the power factor.
What is the wattage required for a device drawing 35 amps?
Watts = Volts x Amps x Power Factor To make your calculation you need to plug-in the Voltage and Power factor. The Power Factor is a value from zero to one with one being a pure resistive load.
How many watts is being used by a motor pulling 13.1 amps at 220 v?
The formula you are looking for is Watts = Amps x Volts. However, since the electricity is (probably) AC (wall power), you need to add an additional factor called "power-factor" because "AC" power doesn't work exactly like DC (battery) power. So the formula becomes Watts = Amps x Volts x "power-factor" - where the power factor is a decimal fraction somewhere between zero and one. Note that power factor is never larger than 1.0. Since the true power (multiplied by the power-factor) is always less than the "apparent power" (volts time amps without power-factor) you can use apparent power (also called "VA" - "Volt-Amperes" as a rough approximation. Unfortunately - in the case of a motor, the power-factor is not constant. It varies rather widely based on both speed and load, so if you need to know the EXACT power, you need a direct-reading AC watt-meter. If you want a closer approximation to "true power" - and you don't know the exact power factor - you can approximate it by multiplying "apparent power" by 0.71.
How many volts are there in a killowatt?
Watts = Voltage x Current x Power Factor 1000 Watts = 1 Kilowatt Therefore, you need to know current and Power Factor to answer your question.
