if you are not sure if ground and earth is really isolated on both sites, you have to measure it. I think it is critical if the cable has been watered(damaging the cable isolation) or if ground and earth is connected in the SCADA(might cause ground loop current). You might test reference measurements with link1 and link 2(each one closed, or both open).
if you are not sure if ground and earth is really isolated on both sites, you have to measure it. I think it is critical if the cable has been watered(damaging the cable isolation) or if ground and earth is connected in the SCADA(might cause ground loop current). You might test reference measurements with link1 and link 2(each one closed, or both open).
The site is remote, so I can't measure, I'm trying to provide advice.
It seems that closing Link 2 stands a decent chance of creating a ground loop (will be the case if analog and earth grounds are connected at the SCADA side.
Regardless there will be some coupling between analog and earth grounds at the SCADA side (even if electrically isolated). Is there any potential advantage to closing Link 1?