How to calculate unit consumption on the basis of load.
kWH=kwXhrs.is it correct? kw is motor load.What is unit
consumption at 100% load, 50% load & on no load.
Answers were Sorted based on User's Feedback
Answer / satish m
For three phase motor we needs to consider the PF also.
P = Sq.Rt 3 X V x I x pf
Is This Answer Correct ? | 62 Yes | 8 No |
Answer / shannu
Unit consumption is KW x Hrs.
But while you need to calculate the KWH consumed by a motor,
multiplying KW of motor (nameplate KW) and hour will not
give you the energy consumed. This is because the name plate
KW in a motor is not the electrical power, but the
mechanical power output provided by the motor (Electrical
Power = Frictional losses + Eddy current losses + Copper
losses + air gap losses + Mechanical power). In order to
calculate the energy consumed by the motor you can use the
formula
single phase AC = Voltage x Rated current x Power factor x
Hrs run. (100% load)
3 Phase AC = 1.732 x Voltage x Rated Current x Power factor
x Hrs run. (100% load)
Normally the power factor of motor is considered between 0.8
to 0.85 at full load operation.
At no-load, motor will take approx 40% of its rated full
load current (again this depends on the design of motor, but
normally assumed to be near 40%). So at 50% load, the motor
will take a current around 70 to 75% of its full load rated
current. so we can approximate as
energy consumed at 50% load (motor - 3 phaase) = 1.732 x
Voltage x 75% rated full load current x power factor x Hrs run .
at no load = 1.732 x Voltage x 40% of rated current x power
factor x Hrs run.
Is This Answer Correct ? | 32 Yes | 7 No |
Answer / shivpal prajapati
kwh=kw*hrs is not correct.
kw=1.732*v.i.0.85,if motor rated current 64amp,
Then calculated value kw=1.732*415*64*0.85
Is This Answer Correct ? | 26 Yes | 9 No |
Answer / sakil belim
i have 70 hp 3 phase load. I run 70 hp in 1 hour in perday
what is kwh
Is This Answer Correct ? | 22 Yes | 8 No |
Answer / tushar amarghade
for 100% load
unit(kwh)- kw*hours/1000
where,
KW for single phase- V*I*PF
KW for THREE phase- 1.732*V*I*PF
Is This Answer Correct ? | 4 Yes | 1 No |
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