KWH FOR A 3-PHASE MOTOR
KWH FOR A 3-PHASE MOTOR
(OP)
I'm trying to figure out kw used per hour of a 3-phase 480
motor and put a price on the power consumed. the motor uses 10amps per phase and we pay 8 cents a kwh. I'm not sure of the PF of the motor. I cant find anything on this subject so any help would be appreciated.thanks
motor and put a price on the power consumed. the motor uses 10amps per phase and we pay 8 cents a kwh. I'm not sure of the PF of the motor. I cant find anything on this subject so any help would be appreciated.thanks





RE: KWH FOR A 3-PHASE MOTOR
RE: KWH FOR A 3-PHASE MOTOR
and will this give me kw per hour? I'm trying to figure out how much it cost per hour to run this motor.
RE: KWH FOR A 3-PHASE MOTOR
kW= (1.732*480*10*0.8)/1000
kwh = kW * hr
where 10 is Line current in any one of the lines, assumed to be identical in all three lines. You need not multiply it with 3. The factor 1.732 takes care of all 3 phases.
RE: KWH FOR A 3-PHASE MOTOR
RE: KWH FOR A 3-PHASE MOTOR
your first post I realized what I had wrote/asked.
RE: KWH FOR A 3-PHASE MOTOR
If it is convenient, a form-12 watthour meter might be temporarily applied.
www.hialeahmeter.com/self.htm
RE: KWH FOR A 3-PHASE MOTOR
RE: KWH FOR A 3-PHASE MOTOR
Or use single phase values and multiply by 3. See my last response in Thread238-101450.
Good luck
RE: KWH FOR A 3-PHASE MOTOR
A basic power meter is about 2 to 4 times the cost of a good rms multifunction clamp meter. This may seem expensive for a meter. But, I believe that what it measures - direct power - is much more useful than current. Measuring electrical power is a much more sensitive indicator of motor loads, as well as of power usage.
RE: KWH FOR A 3-PHASE MOTOR
RE: KWH FOR A 3-PHASE MOTOR
RE: KWH FOR A 3-PHASE MOTOR
RE: KWH FOR A 3-PHASE MOTOR
Their meters use current transformers with a built-in 2 volts shunts so that disconnection of the current circuit can be done without having to use special make-before-break current transformer disconnects.
Thier website is www.econ.com
Mike Cole, mc5w@earthlink.net