Converting Amps to KVA

natanddan1

Anyone know how to convert amps to KVA?

I need to know what 300amps is equivalent in KVa

any help would be appreciated

espresso

natanddan1 wrote: »

Anyone know how to convert amps to KVA?

I need to know what 300amps is equivalent in KVa

any help would be appreciated

KVA is thousands of Volt Amps (Watts)

Assuming 240V 300A = 72KVA

superscaper

Depends on the voltage, it's not a direct conversion. VA is basically a Watt. So you're trying to convert to Kilowatts. As I said you need to know the voltage. If this is mains at say 230V (Official value), then (300 x 230)/1000 is 69 Kilowatts or kVA

moonrakerz

superscaper wrote: »

If this is mains at say 230V (Official value)

Don't start that argument again !!!

superscaper

moonrakerz wrote: »

Don't start that argument again !!!

Depends on the context of the question, practically appliances tend to be rated for 240V but if it's an exam question or something then you'd have to put 230V or you might lose marks as that is the actual British Standard. I've taken a few electrical engineering papers in my time and they really can be that pedantic. Although you'd lose marks for not putting in the tolerances as well :rolleyes:

Of course OP's context may have nothing to do with mains electricity or it may be a non-UK mains supply....

espresso

OK hands up, I put 240V (probably an age thing) but after they changed the tolerance figures, did it really make any difference? Results of a plot over seven days here.

superscaper

espresso wrote: »

OK hands up, I put 240V (probably an age thing) but after they changed the tolerance figures, did it really make any difference? Results of a plot over seven days here.

It was 240 when I did my degree so I always instinctively say and think "240V" but I'm still a member of IET (or IEE as it was then) so I guess I should be a bit more "official" about it :rolleyes:. But you're right in practical terms the UK doesn't actually have to do anything because 240 V falls within the 230 +10% tolerance.

markchadwick

Just came across this post and thought I'd add my $0.02.

Like others have mentioned here, you cannot convert Amps to kilo Volt Amps (kVA) as you require a voltage. The term kVA is used synonymously with "apparent power" and Watts with "actual or real power". So kVA and Watts are not equal unless the load is resistance only (or has been power-factor-corrected). If there are inductors or capacitors in the loop, then this causes phase-lag or phase-lead that can affect the actual power experienced at the load. The aim of electricity suppliers is to minimise the phase-lead/lag so as much of the energy produced is put to good use.

The correct equations that incorporate the phase-lead/lag information involve a term called the "power factor". This all comes down to vectors/phasors. With a purely resistive load, the PF=1.

So in summary,

kVA*PF = Watts (Any load)
kVA = Watts (Resistive load)
kVA=Watts (DC)

Also, remember that for AC the values of V and A are quoted in R.M.S.

Hope this clears it up for you.