pole grounding
pole grounding
(OP)
Good Day! can anyone here give me the pole grounding specification standards of your distribution systems, e.g.( method,resistivity,wires & rode dimensions,rod depth). just want to gather data on what other utility companies are thier standard on pole grounding. thank you very much for the replies! god bless






RE: pole grounding
You can find an example from Serbian distribution utility attached. Ring type of earthing electrode is chosen because of advantages regarding touch voltage reduction on small space available. For more rigid safety requirements, two earthing rings can be applied (right section of drawing). Hope you will find it useful.
Regards,
Miki
RE: pole grounding
RE: pole grounding
Another type of earthing proposed is star type electrodes, because of their advantages in areas with big number of lightning strikes. Combination of rings and star type electrodes is also recommended.
A criteria for earthing resistance is possibility for pole insulation breakdown and hence impact on line conductors during lightning strike and it depends on peak value of lightning current and insulation level (permissible voltage). In practice, that usually means max 10 ohm for poles near substation and max 15 ohm for other poles. Besides earthing electrodes described above, pole foundation contributes to that desired value as well.
Regards,
Miki
RE: pole grounding