High Voltage Overhead Power Lines - Cyprus Agricultural Payments Organisation Building Limassol
The measurements were performed on the 26th of November 2010 at 09:10 am. The EMF measurements were performed inside and outside the residences in direct proximity to the overhead power line.
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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) |
|
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) |
|
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 300 MVA. At the time when the measurements were performed, the load of the overhead power line was 41 MW and 6 MVar.
The Resultant Load of all three phases was 13.81% utilization of the nominal load power.
The maximum obtained magnetic field values are represented below and compared to the ICNIRP specified limits for the General Public. The highest magnetic field value was observed in the veranda of the residence at height 1m (6m from the starting point), with a value 0.125 μT and a percentage of 0.125 % as compared to the ICNIRP General Public standard.
The following table summarizes the magnetic field measurements taken in area under investigation.
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Magnetic Field Measurements |
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Distance from Side /m |
Maximum Magnetic Field (μT) at Z Height /m - Percentage of ICNIRP General Public Standard /% |
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|
0.3m |
ICNIRP % |
1m |
ICNIRP % |
1.75m |
ICNIRP % |
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EMF Field Measurements - Inside the residence |
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|
Point A - Dinning room |
-- |
-- |
0.08 |
0.08% |
-- |
-- |
|
Point B - Kitchen |
-- |
-- |
0.04 |
0.04% |
-- |
-- |
|
Point C - Bathroom |
-- |
-- |
0.05 |
0.05% |
-- |
-- |
|
Point D - Bedroom |
-- |
-- |
0.05 |
0.05% |
-- |
-- |
|
Point E - Living room |
-- |
-- |
0.07 |
0.07% |
-- |
-- |
|
EMF Field Measurements - Outside the residence |
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| 14m Measurement line |
0.12 |
0.12% |
0.13 |
0.13% |
0.09 |
0.09% |
Table 2: Magnetic Field Measurements
Accordingly, the maximum obtained electric field values are represented below and compared to the ICNIRP specified limits for the General Public. The highest electric field value was observed in the veranda of the residence at height 1.75m (0m from the starting point), with a value 89.97 V/m and a percentage of 1.80 % as compared to the ICNIRP General Public standard.
The following table summarizes the electric field measurements taken in the area under investigation.
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Electric Field Measurements |
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|
Distance from Side /m |
Maximum Electric Field (V/m) at Z Height /m - Percentage of ICNIRP General Public Standard /% |
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|
0.3m |
ICNIRP % |
1m |
ICNIRP % |
1.75m |
ICNIRP % |
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|
EMF Field Measurements - Inside the residence |
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|
Point A - Dinning room |
-- |
-- |
0.65 |
0.01% |
-- |
-- |
|
Point B - Kitchen |
-- |
-- |
10.31 |
0.21% |
-- |
-- |
|
Point C - Bathroom |
-- |
-- |
0.66 |
0.01% |
-- |
-- |
|
Point D - Bedroom |
-- |
-- |
0.98 |
0.01% |
-- |
-- |
|
Point E - Living room |
-- |
-- |
0.90 |
0.02% |
-- |
-- |
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EMF Field Measurements - Outside the residence |
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|
14m Measurement line |
-- |
-- |
75.29 |
1.51% |
89.97 |
1.80% |
Table 3: Electric Field Measurements