bmaneckjee
22-10-2016, 04:46 PM
I'm interested in estimating input power on a 208/3/60 ZP scroll compressor. I have a CT installed over one leg and assuming that the motor coils are balanced and that phase to phase voltage is 208V all I need to know to estimate the power consumption is the power factor for this compressor.
Power in kW = Amps x 3 x 208 / 1.73 * PF / 1000
When I use a PF of 0.9 I seem to be getting higher input power than expected under the load conditions. So either 0.9 is too high or I need to use a corrective factor for the inexpensive 0-5V CT being used.
Anyone know where to obtain the PF for such a compressor or whether it is to be expected that a corrective factor be used with an ordinary CT in a 3P environment?
Power in kW = Amps x 3 x 208 / 1.73 * PF / 1000
When I use a PF of 0.9 I seem to be getting higher input power than expected under the load conditions. So either 0.9 is too high or I need to use a corrective factor for the inexpensive 0-5V CT being used.
Anyone know where to obtain the PF for such a compressor or whether it is to be expected that a corrective factor be used with an ordinary CT in a 3P environment?