Hi folks!
I just rummaged through this thread for the first time and it is highly interesting.
I am far from being initiated into electronics. Hence, please excuse me if I am being irrelevent. But I can't help but suggest the following:
Convert the alternaing signal to a pulse using possibly a...
How to ensure that the phase sequence of the two sources also is matching?
Secondly, I have noticed that most of the synchronization check relays use only two lines of each source for comparison. What if the line-to-line voltages vis-a-vis the third line do not match?