Kva To Kw Conversion Formula Pdf Download For Mac
November 17, 2017 How to convert VA to Watts and KVA to Kilowatts Convert Watts to VA Convert VA to Watts Convert VA To Amps Convert Amps to VA Convert KVA to KW Convert Kilovolt-Amps to Kilowatts Convert Amps to KVA Convert Watts to KVA Convert 3-phase Amps to KVA Custom design and manufacture of state-of-the-art power supplies, battery packs, battery chargers, AC Adapters, and power supplies for OEMs in a Hurry Basics of AC power calculation Since watts is volts times amps, what is VA? VA (or volt-amps) is also volts times amps, the concept however has been expanded and extended cover some of the subleties of AC power. For DC current: VA = Watts (DC current). In AC if the volts and amps are in phase (for example a resistive load) then the equation is also VA=Watts (resistive load) where V is the RMS voltage and A the RMS amperage. But here is the difference. In AC, the volts and amps are not always in phase (meaning that the peak of the voltage curve is does not happen at the peak of the current curve). Think of pushing a swing.
The greatest force is applied when the swing stops at the peak, but the greatest velocity is at the bottom of the arc. When you have reactive circuit elements the current can't keep up with the voltage, but lags behind. So in AC, if the volts and amps are not precisely in phase you have to calculate the watts by multiplying the volts times the amps at each moment in time and take the average over time, i.e. The integral of V.A dt over a full cycle. The ratio between the VA (i.e. Rms volts time rms amps) and Watts is called the power factor PF.
VAPF = Watts (for any load, including inductive loads) In other words, volt-amps x power factor = watts. Similarly, KVA.PF = KW, Or kilovolt-amps times power factor equals kilowatts. When you want to know how much the electricity is costing you, you use watts. When you are specifying equipment loads, fuses, and wiring sizes you use the VA, or the rms voltage and rms amperage. This is because VA considers the peak of both current and voltage, without taking into account if they happen at the same time or not.
Kva To Kw Conversion Formula Pdf Download For Mac Free
Finding the Power Factor How do you find the power factor? This isnt easy. The idea is that you multiply the amps times the volts for every increment of time and take the sum and average. You then divide this by the power you would have calculated if the amps and volts are exactly in phase. Since the voltage and current can be out of phase (which is the whole point of power factor) the power factor can be anywhere between zero and one. For computer power supplies and other supplies that are power factor corrected the power factor is usually over 90%.
For high power motors under heavy load the power factor can be as low as 35%. Industry standard rule-of-thumb is that you plan for a power factor of 60%, which somebody came up with as a kind of average conservative power factor. Converting VA to Amps How to convert VA to amps?
Use the following formula: A = (Va. Pf)/V Where A stands for the RMS amps, VA stands for volt-amps, V stands for RMS volts and PF stands for the power factor. Converting VA to Volts How to convert VA to volts? Use the following formula: V=(Va.Pf)/A Where V stands for RMS volts, A stands for the RMS amps, VA stands for volt-amps, and PF stands for the power factor. KVA is just kilovolt-amps, or volts times amps divided by 1000: KVAPF = KW (any load, including inductive loads) Where KVA stands for kilovolt-amps, KW stands for kilowatts, and PF stands for the power factor. Keep the factor of 1000 straight when dealing with mixed units: KVAPF = W/1000 (any load, including inductive loads) VAPF = 1000KW (Kilowatts to VA) The Following equations can be used to convert between amps, volts, and VA. To convert between kilovolt-amps, kilowatts, and kiloamps, keep track of the factor of 1000.