Power factor three phase supply - single phase loads
Power factor three phase supply - single phase loads
(OP)
Im curious as in how to give information relating to this sort of complexity.....
Right simple explaination of system. Various single phase loads connected to a 415v three phase supply. supply being four wire as neutral is included.
So we can have say a total of 15A on phase one 34A on phase two and 24A on phase three. What would the power being consumed from the supply be ? Im looking at the actual watts figure as this is what we use to base the cooling requirements on. Id rough a guess that it would simply be VxA for each phase to give the power dissipated. Power factor would need to be factored and this would have to be done as per single phase wouldn't it? or would the powerfactor given for all three phases suffice.
so it would be (Ia + Ib + Ic) x 240 x pf /1000 = kW figure
for watts dissipated by loads.....
Rugged
Right simple explaination of system. Various single phase loads connected to a 415v three phase supply. supply being four wire as neutral is included.
So we can have say a total of 15A on phase one 34A on phase two and 24A on phase three. What would the power being consumed from the supply be ? Im looking at the actual watts figure as this is what we use to base the cooling requirements on. Id rough a guess that it would simply be VxA for each phase to give the power dissipated. Power factor would need to be factored and this would have to be done as per single phase wouldn't it? or would the powerfactor given for all three phases suffice.
so it would be (Ia + Ib + Ic) x 240 x pf /1000 = kW figure
for watts dissipated by loads.....
Rugged






RE: Power factor three phase supply - single phase loads
Your KVA will be (Ia+Ib+Ic)x240/1000
This formula also works for 415 volt loads connected phase to phase, as 240V/415V = root three, so the root three factor for 415 loads is built in.
Your kWatts will be KVA x Power factor.
yours
RE: Power factor three phase supply - single phase loads
For your numbers, this will not have much effect, but I mention it in case someone extrapolates from this thread to a situation where is DOES have a major impact.
RE: Power factor three phase supply - single phase loads
I agree with you.
respectfully
RE: Power factor three phase supply - single phase loads
rugged
RE: Power factor three phase supply - single phase loads
If this is as I suspect for an air conditioning load check, I would ignore power factor in the calculations. The error will again be on the safe side.
yours