connectivity

[sumi]

I have to measure the voltage and current readings from a small substation. All the votage and current are properly scaled down to suit for the field ponit module cFP-AI-100.

The readings are monitored in the PC which is placed somewhat 200-300m away from the substation. My problem is about the connectivity between the two terminals. I have two options with me now.

1. Field point placed near PC. bring the real voltage and current signal to the field point terminal via cable.

2. Place the fieldpoint module in the substation. From the field point controller connect PC via ethernet.

Which method is suitable? Is there any technical problems?

Can i get some other LOW COST solutions for connectivity?

[Brian_K.]

Hi sumi,

I think that extending a voltage signal cable over 300 meters away is not a good idea.  Signal strength, noise, and transmission line characteristics all become an issue.  Having the FieldPoint module at the substation with a networked ethernet connection would be better.  I think IEEE ethernet specifications say that an ethernet cable cannot be over 100 m point to point. Can anyone back me up on this?  So if you do choose this option you will need a network already in place, or a repeater of some kind.

[ELUE]

Can i still use ethernet cable with repeters? What is the way to etxend the cable over long distance?

[Brian_K.]

Hi ELUE,

A quick search on google showed that there are ethernet repeaters.  I assume they do a very similar process as an ethernet switch.