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Thanks guys, worked a treat!

It is a field test on an installed motor. The motor is running at 230V, pulling around 1A, maybe a bit more. I am only looking at creating 2-3% unbalance.

Hi guys, I want to conduct an experiment, but need a little help. I want to create a voltage phase unbalance on a small three phase system an monitor the current unbalance. My question is this. Is there a simple method of inducing a small voltage unbalance?

Thanks edison123. What I am really looking for however is a method of calculating the kW savings after replacing the motor, if thats possible... Thanks again!

Could anyone explain to me the kW savings from replacing an oversized motor. I have calculated the kW Input from (V x I x 1.73 x P.F.)/1000 and calculated load from: Load = kw Input/(Rated H.P. x 0.746)/F.L. Efficiency. If I have a 10hp motor running at 50% load, how do I justify...

Sorry, wasnt aware that VFD affected voltage waveform. I have a true power meter and I want to also measure kW and PF.I presume I should also forget about that because of the VFD?

Thanks guys. I have had another look at it, and just to clarify in more detail. When I measure between any one of the phases and ground at the motor terminals, I get a varying voltage. The phase to phase voltage is a steady value. There is a VFD on the motor, but the frequency is not varying...

I have a three phase motor which is running a conveyor. I want to measure the phase voltage. When I measure between phase and ground the reading varies between 75V and 160V. Is this normal??

Hi guys, I have a 3 phase induction motor and have calculated the load (calculated to be 75%) and the full load torque by using the following: (HP x 5252)/Full load RPM Would it be fair to say that the actual torque required by the load can be calculated as follows...

Hi guys, Thanks to everyone who replied (really sorry about the delay). Some good info here, I should have plenty to work with. Thanks again!

Hi everyone, This is my first time dabbling in the energy management field and I already find myself turning to a forum for some help! I am trying to figure out the cost of running a three phase motor. I have ended up with: Cost=Volts*Amps*PF*1.73/1000 * hours*cent/kWh From what I have read...