Hello, I am wondering if it is possible for an induction motor in a system could produce harmonics? I had often considered induction motors a non-linear device kind of like a rotating transformer, but I'm told they should only be considered a linear device.
The system in question is an oil well using an electric submersible pump (induction motor driving a fluid pump). The motor is provided power through a three phase cable, let's say about 2500-3000 feet long. The cable is connected to a switchboard at surface, that is fed via a step down transformer from a 60Hz line.
The system voltage is around 1400VAC, and the amps are around 30 amps. The man taking measurements has recorded 3.96% VTHD and 12.4% ITHD. The current harmonic distortion is made up almost entirely 5th order. From what I understand, there are several sites similar to this one on the power line, but he is only seeing this result on a few of the sites. We want to know why the ITHD would be this high. I've attached a photo of the measurement trend.
We have considered possible saturation as an issue, is there anything you folks would check out? Let me know if more info would be helpful!
The system in question is an oil well using an electric submersible pump (induction motor driving a fluid pump). The motor is provided power through a three phase cable, let's say about 2500-3000 feet long. The cable is connected to a switchboard at surface, that is fed via a step down transformer from a 60Hz line.
The system voltage is around 1400VAC, and the amps are around 30 amps. The man taking measurements has recorded 3.96% VTHD and 12.4% ITHD. The current harmonic distortion is made up almost entirely 5th order. From what I understand, there are several sites similar to this one on the power line, but he is only seeing this result on a few of the sites. We want to know why the ITHD would be this high. I've attached a photo of the measurement trend.
We have considered possible saturation as an issue, is there anything you folks would check out? Let me know if more info would be helpful!