Substation - Substation Nestor, Company DataTech IT, Sotira Street
The measurements were performed on the 3rd December 2014 at 16:00 a.m during clear weather conditions. The EMF measurements were performed for the company "DataTech IT", Sotira Street and substation Nestor in Strovolos, Nicosia.
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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 substation is rated at a nominal power of 630 KVA. At the time when the measurements were performed the substation load was recorded as:
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Red Phase |
Yellow Phase |
Blue Phase |
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280A |
230A |
280A |
Table 2: Measured load current
From the resultant load of all three phases as shown above we note that the load is only 28.84 % of the nominal load (630 KVA Transformer).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 rfront side of the substation, 0 m away from the substation starting point and at a height of 1 m. The measured value at this point was 7.849µT and a persentage of 7.849% as compared to the INCIRP General Public stantard.
A detailed description of the maximum measured magnetic fields in the area under investigation, outside the substation, is shown in the following table.
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Magnetic Field Measurements |
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Distance from Side /m |
Maximum Magnetic Field (μT) at Z Height (m) |
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0.3m |
ICNIRP % |
1m |
ICNIRP % |
1.75m |
ICNIRP % |
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Substation front side - Mesh - Maximum values per line |
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M.L. 0m away from |
4.222 |
4.222% |
7.849 |
0.249% |
5.002 |
5.002% |
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M.L. 1m away from |
1.152 |
1.152% |
1.538 |
0.190% |
0.909 |
0.909% |
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M.L. 2m away from |
0.699 |
0.699% |
0.825 |
0.095% |
0.649 |
0.649% |
| M.L. 2m away from Substation front side | 0.366 | 0.366% | 0.439 | 0.439% | 0.386 | 0.386% |
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Substation top side side - Mesh - Maximum values per line |
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M.L. 0m away from Substation top side |
1.462 |
1.462% |
0.685 |
0.685% |
0.433 |
0.433% |
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M.L. 1m away from |
1.355 |
1.355% |
0.632 |
0.632% |
0.421 |
0.421% |
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M.L. 2m away from Substation top side |
0.253 |
0.253% |
1.966 |
1.866% |
2.081 |
2.081% |
Table 3: Maximum Magnetic Field Measurements.
A detailed description of the maximum measured magnetic fields in the area under investigation, inside the company DataTech IT, is shown in the following table.
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Magnetic Field Measurements |
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Distance from Side /m |
Maximum Magnetic Field (μT) at Z Height (m) |
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0.3m |
ICNIRP % |
1m |
ICNIRP % |
1.75m |
ICNIRP % |
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Company - First Floor |
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Measurement Point A |
-- |
-- |
0.344 |
0.344% |
-- |
-- |
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Company - Second Floor |
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Measurement Point B |
-- |
-- |
3.829 |
3.829% |
-- |
-- |
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Company - Third Floor |
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Measurement Point C |
-- |
-- |
10.800 |
10.800% |
-- |
-- |
Table 4: Maximum Magnetic Field Measurements.
The highest electric field measurement was observed at the third floor of the company, at measurement point E and at a height of 1 m. The measured value at this point was 57.68 V/m and a percentage of 1.154 % as compared to ICNIRP General Public standard. A detailed description of the maximum measured electric fields in the area under investigation, inside the residence, is shown in the following table.
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Electric Field Measurements |
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Measurement Point |
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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Substation right side - maximum values per line |
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Measurement Point A |
-- |
-- |
1.042 |
0.021% |
-- |
-- |
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Substation back side - maximum values per line |
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Measurement Point B |
-- |
-- |
14.570 |
0.291% |
-- |
-- |
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Residence - Kitchen |
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Measurement Point C |
-- |
-- |
4.634 |
0.093% |
-- |
-- |
| Residence - Sitting room | ||||||
| Measurement Point D | -- | -- | 3.310 | 0.066% | -- | -- |
| Residence - Bedroom 1 | ||||||
| Measurement Point E | -- | -- | 57.680 | 1.154% | -- | -- |
Table 5: Electric Field Measurements.