The measurements were performed on the 3rd October 2012 at 10:30 a.m.during clear weather conditions. The EMF measurements were performed for the residence at Kantaras Street, Kaimakli, and substation"Bata""in Nicosia. The following figures provide pictures of the area where EMF measurements were recorded.
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.
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 |
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 substation is rated at a nominal power of 500 KVA. At the time when the measurements were performed the substation load was recoreded as:
Red Phase |
Yellow Phase |
Blue Phase |
120.00 A |
105.00 A |
110.00 A |
Table 2: Measured Load Current when building was fully operating
From the resultant load of all three phases as shown above we note that the load is 15.41 % of the nominal load (500 KVA Transforemer). It must therefore be noted that during the summer or in periods of peak load this will directly affect and produce an increase to the electric and magnetic fields.
The highest magnetic field measurement was observed at the left side of the substation at a height of 0.3 m (2 m from the starting point). The measured value at this point was 4.162 µT and a percentage of 4.162 % as compared to the ICNIRP General Public standard.
A detailed description of the maximum measured magnetic fields in the area of investigation is shown in the following table.
Magnetic Field Measurements |
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Measurement Method/Distance
|
Maximum Magnetic Field/T at Z Heigh- Percentage of ICNIRP General Occoupational/Public Standard/%
|
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0.3m |
ICNIRP % |
1m |
ICNIRP % |
1.75m |
ICNIRP % |
|
Substation Front side - Mesh - Maximum Values per Line |
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Measurement Line 0m away from substation Front side |
0.912 |
0.912 |
0.720 |
0.720 |
0.595 |
0.595 |
Measurement Line 1m away from substation Front side |
0.378 |
0.378 |
0.269 |
0.269 |
0.244 |
0.244 |
Measurement Line 2m away from substation Front side |
0.210 |
0.210 |
0.142 |
0.142 |
0.121 |
0.121 |
Substation Left side - Mesh - Maximum Values per Line |
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Measurement Line 0m away from substation Left side |
4.162 |
4.162 |
1.387 |
1.387 |
0.920 |
0.920 |
Measurement Line 1m away from substation Left side |
0.732 |
0.732 |
0.481 |
0.481 |
0.516 |
0.516 |
Measurement Line 2m away from substation Left side |
0.382 |
0.382 |
0.273 |
0.273 |
0.265 |
0.265 |
Magnetic Field Measurements - Residence Veranda |
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Measurement Point MP-A |
-- |
-- |
0.065 |
0.065 |
-- |
-- |
Table 3: Magnetic field measurements inside area
The highest electric field measurement was observed at the left side of the substation at a height of 1 m. The measured value at this point was 0.791 V/m and a percentage of 0.016 % as compared to the ICNIRP General Public standard.
The maximum electric field measurements in the area under investigation are shown in the following table.
Electric Field Measurements |
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Measurement Method/Distance |
Maximum Electric Field-V/m at Z Height /m - Percentage of ICNIRP General Occoupational/Public Standard /% |
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0.3m |
ICNIRP % |
1m |
ICNIRP % |
1.75m |
ICNIRP % |
|
Electric Field Measurements - Outside of substation |
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Measurement point EP- B |
-- |
-- |
0.791 |
0.016 |
-- |
-- |
Table 4: Maximum electric field measurements.