High Voltage Overhead Power Lines - 32 A Karolou Koun, Agios Athanasios
The measurements were performed on the 9th of March 2009 at 09:50 am. The EMF measurements were performed inside and outside the residence and in direct proximity to the overhead power lines. The following figures provide pictures of the area where EMF measurements were recorded.
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Limiting exposure values have been provided by the ICNIRP recommendations and are guidelines to many countries and organisations. The exposure limits at 50 Hz are tabulated in the following table according to the limits given by ICNIRP.
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Reference levels for Occupational exposure ICNIRP |
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Frequency |
Electric Field Strength, E (V/m) |
Magnetic Field Strength, H (A/m) |
Magnetic Flux Density, B (µT) |
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50 Hz |
10000 |
400 |
500 |
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Reference levels for General Public exposure ICNIRP |
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Frequency |
Electric Field Strength, E (V/m) |
Magnetic Field Strength, H (A/m) |
Magnetic Flux Density, B (µT) |
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50 Hz |
5000 |
80 |
100 |
Table 1: ICNIRP exposure limits for Occupational and General public exposure
The overhead power line is rated at a nominal power of 145 MW. At the time when the measurements were performed, the load of the overhead power line was 8 MW. The resultant load of all three phases was 5.52 % utilisation of the nominal load power.
The highest magnetic field outside was observed below the overhead power lines, with a value 1.19 μT (10 m away from the starting point) and a percentage of 1.19 % as compared to the ICNIRP General Public standard. The following table summarizes the highest recorded measured values.
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Magnetic Field Measurements - outside area |
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Distance from side (m) |
Maximum Magnetic Field (µT) at Z Height (m) |
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0.3m |
ICNIRP % |
1 m |
ICNIRP % |
1.75 m |
ICNIRP % |
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Measurements outside |
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Point A |
-- |
-- |
0.01 |
0.01% |
-- |
-- |
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Point B |
-- |
-- |
0.01 |
0.01% |
-- |
-- |
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Point C |
-- |
-- |
0.03 |
0.013% |
-- |
-- |
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Point D |
-- |
-- |
0.01 |
0.01% |
-- |
-- |
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Measurements along the Overhead Power Line |
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20m Measurement Line |
0.86 |
0.86% |
1.01 |
1.01% |
1.19 |
1.19% |
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Measurements across the Overhead Power Line |
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50m Measurement Line |
0.81 |
0.81% |
0.78 |
0.78% |
0.89 |
0.89% |
Table 2: Maximum field measurements outside
Accordingly the highest magnetic field value inside was observed in the second residence, with value 0.01 μT and a percentage of 0.01 % as compared to the ICNIRP General Public standard.
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Fields measurements - inside area |
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Distance from Side (m) |
Maximum Magnetic Field (µT) at Z Height (m) |
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0.3m |
ICNIRP % |
1 m |
ICNIRP % |
1.75 m |
ICNIRP % |
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Field measurements inside the substation (Distance from left wall inside) |
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Point A |
-- |
-- |
0.01 |
0.01% |
-- |
-- |
Table 3: Maximum field measurements inside