Could you please explain how transformer phase lags could jump? As I understand synchronous generators tied to a common grid, it is not possible for them to have large phase angle differences under normal conditions. Losing a whole cycle would cause forces that could damage the machine.
What that means is, that if the two locations representing the red and green traces are on the same grid then there should be less than one cycle difference between them at all times. NTP can't be causing the jumps because the difference increases with time. You would see the displayed time difference change as well. Since that is not the result that you have, it is time to calibrate your equipment. I'd start with the line frequency sensor looking for dropped cycles. It's possible that different computers running different other programs could drop different numbers of points. What are they doing when the steep drops in difference occur? Is anyone else running a similar experiment? Bill Hawkins -----Original Message----- From: Poul-Henning Kamp Sent: Thursday, August 04, 2011 1:13 AM The jumps in the difference looks a lot like transformer phase-lag in the grid, but the real test is to collect more data and see if you ever see the difference move the other way. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.