2007-08-26 06:33:42 · 8 answers · asked by amponnu 1 in Science & Mathematics ➔ Engineering
*KVA of transformer?
Single Phase:
*3-Phase:
http://www.dme.net/wwwdme/tech/Selecting%20a%203%20phase%20transformer.pdf
#KVA is just kilovolt-amps, or volts times amps divided by 1000:
KVA·PF = 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:
KVA·PF = W/1000 (any load, including inductive loads)
VA·PF = 1000·KW (Kilowatts to VA)
The Following equations can be used to convert beween amps, volts, and VA. To convert between kilovolt-amps, kilowatts, and kiloamps, keep track of the factor of 1000.
#VA·PF = Watts (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.
http://www.powerstream.com/VA-Watts.htm
2007-08-26 07:56:39 · answer #1 · answered by alpha b 7 · 2⤊ 0⤋
kVA is "thousand volt-amperes".
If you know the voltage and the current, the formula for single phase kVA is volts x amps ÷ 1000.
For 3Ø systems: kVA = volts x amps x √3 ÷ 1000.
(use the Ø to Ø voltage)
In the event you already know kW, convert to kVA by dividing by the power factor (PF). kVA = kW ÷ PF.
In a purely resistive circuit, the PF is 1.00 so kW = kVA. For commercial applications, the PF is closer to 0.85 lagging. It is not uncommon for Industrial customers to have uncorrected power factors as low 0.75 lagging.
2007-08-26 07:31:47 · answer #2 · answered by Thomas C 6 · 2⤊ 0⤋
KVA is the apparent power=real power(W) / power factor
or voltage *current
2007-08-26 15:25:48 · answer #3 · answered by A learner 1 · 0⤊ 0⤋
volt-amps x power factor = watts.
Similarly, KVA*PF = KW
hence, KVA =KW / PF
2007-08-26 08:50:50 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Multiply the voltage by the amperage and divide by 1000.
2007-08-26 06:43:03 · answer #5 · answered by Vincent G 7 · 2⤊ 2⤋
voltage should be multiplied by amperage n divided by thousand
2007-08-30 01:06:01 · answer #6 · answered by Anonymous · 0⤊ 0⤋
just a bit more detail? but you should be able to get it out of your last few questions.
2016-05-18 02:33:31 · answer #7 · answered by ? 3 · 0⤊ 0⤋
don't know
2007-08-26 06:52:36 · answer #8 · answered by mahesh 2 · 0⤊ 5⤋