plc communication over high voltage cables using inductive coupling
plc communication over high voltage cables using inductive coupling
(OP)
I am testing plc equipment over 25kV power lines using inductive clamp couplers. I find that data transfer speeds are higher in the direction of the load. I intuitively understand why but I don't have a technical explanation. Also I would like to know if it is possible to transmit data using inductive coupling when a voltage is present but the cicuit is open at one end and therefore has no load or current flow. I suspect it's not possible but can't get my brain around explaining why.





RE: plc communication over high voltage cables using inductive coupling
Gunnar Englund
www.gke.org
RE: plc communication over high voltage cables using inductive coupling
If you wanted this system to work effectively you would deliberately increase the HF impedance of the lines by adding a choke (perhaps just a ferrite core). Then your signal wouldn't get shorted. Better yet might be to inject the signal onto both lines and use common-mode chokes at both ends of the line. Then the core won't get saturated by the power.
RE: plc communication over high voltage cables using inductive coupling