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SV1XV / Photos

ITU ground conductivity map of Greece

Ground conductivity map for Greece, used for assessment of Low Frequency and Medium Frequency radio propagation. The units are mS/m.

Magenta: 0.17 - 0.55 mS/m
Blue: 0.55 - 1.7 mS/m
Green: 1.7 - 5.5 mS/m
Yellow: 5.5 - 17 mS/m (0.0055 - 0.017 S/m)
Orange: 17-55 mS/m (0.017-0.055 S/m)

Sea: 5000 mS/m (5 S/m)

Colorized version of map in Recommndation ITU-R P.832-2, World Atlas of Ground Conductivities (1997).
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9 comments

GrahamH said:

For a 6 month period in 1975 while I was covering a man on long service leave I used these type of maps. The work was around potential for dangerous voltages to be induced into copper telecoms cables when an earth fault occurred on an electrical power distribution line. Sometimes I had to measure resistivity in an area if we judged the map to be lacking in details.
2 years ago

SV1XV said:

Thanks for your input, very interesting. I used to own equipment for measurement of ground resistance, I still have the stainless steel electrodes and the 2 kg hammer.
2 years ago

GrahamH replied to SV1XV:

What were you doing that involved earth resistivity? Lightning protection at radio towers?
2 years ago

SV1XV said:

Well, in my area electrical installations are of the direct earth/ground system (TT acc IEC 60364) so ground resistance measurements are essential.
2 years ago ( translate )

GrahamH replied to SV1XV:

Did you work as an inspector or engineer with a supply authority?
2 years ago

SV1XV said:

No, but I was involved in a number of small scale cogeneration projects.
2 years ago

GrahamH replied to SV1XV:

Ahh, ok. Did these projects use industrial waste or were they places like hospitals which have high temperature incinerators with heat being a by-product?
2 years ago

SV1XV said:

No, cogeneration using (Russian) natural gas under a special cogen tariff.
2 years ago ( translate )

GrahamH replied to SV1XV:

Ok.
2 years ago ( translate )
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