Hello to every one and happy new year,
during a dynamic test on a medium tension AC motor, I've found a repetitive notch depth.
I have read that could be linked to a non linear load, but the questions are:
- in MT circuit is there a % limit referenced to an IEEE standards?
- the motor is drive a feedwater pump inside a combined cycle power plant. Which non linear load could be the origin of signal distortion?
- in attachment the image of the signal. What do you think about the notch depth level?