Current sensor phase angle shift

is that 1.1 phase angle shift a lead or lag shift?

a lag shift

Hello,

I do not understand what you mean with "1.1 phase angle shift". Is that 1.1 degrees or plus 10 percent of the period ?

Apart from that, independant of lag or lead, the magnitude will not be influenced as long as your frequency of the monitored signal is low compared with the sensors limit frequency. If, lets say, the monitored frequency is 50Hz, the sensors frequency should be minimum ten times more.
Regards, Uwe

Current sensor as in current transformer with additional electronics, Hall effect sensor, or what? Current transformers generally have a low end nonlinearity, as it takes a certain level of magnetizing current to make the thing work. One comment made so far is that the current sensor should have a frequency 10 times greater than the measured frequency. That comment refers to "frequency response" of the sensor. In other words, the sensor would be capable of fairly measuring 50 - 400 Hz linearly, for example. Most sensors or transformers will have a calibration curve associated with them, and if you didn't get one with your sensor, ask the manufacturer for one. The specifications may tell you that the sensor follows the curve within +/- 3% or something like that, so be aware that what you see may not be what you get. If you're trying to get more precise readings without phase shift, there are other ways to do it. Bottom line: Phase shift doesn't mean that you're not getting fairly accurate representation of mains current level. What is does mean, however, is that you're not getting accurate readings at an instant in time. So synchronizing generators to produce power and put it back onto the mains is another animal and should only be done with lots of knowledge and proper equipment, as things blow up when not done just right.