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KVA into kW

Created by: masimn at: 1/29/2013 7:20 AM (8 Replies)

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1/29/2013 7:20 AM	Rate (0)
masimn Posts: 48 Rating: (0)	Can anybody please tell if we have a instrument having power rating in KVA or KV how can we convert it into kW rating?
masimn Posts: 48 Rating: (0)
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1/29/2013 8:00 AM	Rate (1)
falki Bronze Member Joined: 1/8/2008 Last visit: 8/5/2025 Posts: 264 Rating: (45)	Hello, P = U x I 1W = 1V x 1A = 1VA = 1W 1kVA = 1000 x VA = 1000 x W = 1kW regards

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1/29/2013 8:30 AM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating: (1183)	The real power P in kilowatts (kW) is equal to the apparent power S in kilovolt-amps (kVA), times thePF P_(kW)=S_(kVA)×PF So kilowatts are equal to kilovolt-amps times the power factor. kilowatts = kilovolt-amps × PF or kW = kVA × PF

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1/29/2013 10:17 AM	Rate (0)
Mike J Platinum Expert Joined: 10/9/2007 Last visit: 8/18/2025 Posts: 1281 Rating: (116)	falki Hello, P = U x I 1W = 1V x 1A = 1VA = 1W 1kVA = 1000 x VA = 1000 x W = 1kW regards Hi falki if at your home you are paying for kVA and thinking this is the same as kW, you are losing a lot of money!!!
	Energy Automation products: Sicam, Siprotec, Digsi
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1/29/2013 11:05 AM	Rate (0)
falki Bronze Member Joined: 1/8/2008 Last visit: 8/5/2025 Posts: 264 Rating: (45)	Hi Mike J, I don't know, that masimn explicit ask for AC-Power. The International System Of Units (SI) say's : 1VA=1V x 1A= 1W It's also correct for DC-Power (power factor = 1) regards

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1/29/2013 12:39 PM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 8/31/2025 Posts: 4522 Rating: (843)	falki Hi Mike J, I don't know, that masimn explicit ask for AC-Power. The International System Of Units (SI) say's : 1VA=1V x 1A= 1W It's also correct for DC-Power (power factor = 1) regards S = 1 VA= Apparent Power [VA]= 1V * 1A P = 1 Watt = Active power [Watt] = Apparent power * Cos (Phi) While "Cos (Phi)" = PF "Power factor" Q = 1 VAr = Reactive power [VAr]= Apparent power * Sin (Phi) In most cases (most governments) apply penalities for bad power factor. For avoid these penaities, you have to improve the power factor. http://en.wikipedia.org/wiki/Power_factor http://en.wikipedia.org/wiki/AC_power Attachment PFC.pdf (417 Downloads)
	Ayman Elotaify
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1/29/2013 12:59 PM	Rate (0)
Mike J Platinum Expert Joined: 10/9/2007 Last visit: 8/18/2025 Posts: 1281 Rating: (116)	Hi Falki the colleague asked how to convert VA into W and you simply told him VAis the same as W, and it is not. There is no apparent or reactive power in DC, only active power. I don't want to enter in technical discussions here. It is clear that you just copied the information from somewhere andtried to help. I just made a joke and didn't mean to offend you, sorry if I did.
	Energy Automation products: Sicam, Siprotec, Digsi
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1/29/2013 2:11 PM	Rate (0)
falki Bronze Member Joined: 1/8/2008 Last visit: 8/5/2025 Posts: 264 Rating: (45)	Hi, I think VA is the same as W -> 1VA = 1W (thats only units) (http://de.wikipedia.org/wiki/Voltampere) but Apparent Power [VA] is not the same as real power [Watt] So we have all right

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1/29/2013 3:37 PM	Rate (0)
Mike J Platinum Expert Joined: 10/9/2007 Last visit: 8/18/2025 Posts: 1281 Rating: (116)	hi falki again: a colleague ask for a convertor, and you told him that 1VA =1W. It is not only units. If the colleague is measuring the power on a condensator (capacitor) ora reactor (inductor), then VAis almost like VAr, and W is almost 0! Wikipedia is not 100% trustfull. People like you and mecan also edit the pages and I know that there is like a competition tosee which is the languagewhich has moretopics, somany people simply write something there,and in several cases the information is wrong. Take a look at the English page of Wikipedia for volt-ampere. Besides the better description, you have the famous Power Triangle, where you can see P (W), S (VA) and Q (VAr). For us, electrical engineers who also like beer, in the attached picture you will also find a better representation of P, Q and S . Ayman had already given what are the mathematical formulas for S, P and Q and this triangle is simply the graphical representation of it. Mike Attachment C:\Documents and Settings\nb22asr0\Desktop\bierre-js.jpg (334 Downloads)
	Energy Automation products: Sicam, Siprotec, Digsi
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This contribution was helpful to 4 thankful Users fritz Ayman Elotaify Thunderstorm tuanva06

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