Substation - Substation 20, 24 Nikou Pattihi Street
On the 6th of April 2009 at 09:30 am electric and magnetic field measurements were performed for residence 24 Nikou Pattihi Street in Limassol and the Distribution Substation No. 20.
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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 800 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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376.1 A |
388.8 A |
589 A |
Table 1: 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 only 40.62 % of the nominal load (800 KVA Transformer).
The highest magnetic field inside was observed on the front side of the distribution transformer, with a value 0.05 μT and a percentage of 0.05 % as compared to the ICNIRP General Public standard.
A detailed description of the maximum measured magnetic fields inside is shown in the following table.
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Inside Field Measurements |
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Distance from Side /m |
Maximum Magnetic Field 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 |
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Point A |
-- |
-- |
0.04 |
0.04% |
-- |
-- |
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Point B |
-- |
-- |
0.02 |
0.02% |
-- |
-- |
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Point C |
-- |
-- |
0.05 |
0.05% |
-- |
-- |
Table 2: Magnetic Field Measurements inside area
Accordingly the highest magnetic field value inside was observed on the front side of the distribution transformer, with a value 33.28 μT (6m away from the starting point) and a percentage of 33.28 % as compared to the ICNIRP General Public standard.
A detailed description of the maximum measured magnetic fields in the outside area is shown in the following table.
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Outside Field Measurements |
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Distance from Side /m |
Maximum Magnetic Field 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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Plot Field Measurements |
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Measurement Point D |
-- |
-- |
-- |
-- |
1.82 |
1.82% |
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Substation Front Side |
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0m |
18.20 |
18.20% |
33.28 |
33.28% |
24.32 |
24.32% |
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1m |
1.68 |
1.68% |
2.40 |
2.40% |
1.48 |
1.48% |
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2m |
1.25 |
1.25% |
0.91 |
0.91% |
0.71 |
0.71% |
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Substation Left Side |
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0m |
31.04 |
0.04% |
11.08 |
11.08% |
8.22 |
8.22% |
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1m |
4.94 |
0.03% |
3.06 |
3.06% |
2.52 |
2.52% |
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2m |
1.13 |
0.03% |
1.26 |
1.26% |
1.15 |
1.15% |
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Substation Right Side |
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0m |
0.63 |
0.63% |
0.51 |
0.51% |
0.43 |
0.43% |
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1m |
0.29 |
0.29% |
0.27 |
0.27% |
0.25 |
0.25% |
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2m |
0.20 |
0.20% |
0.20 |
0.20% |
0.15 |
0.15% |
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Substation Back Side |
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0m |
6.48 |
6.48% |
3.96 |
3.96% |
2.80 |
2.80% |
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1m |
2.06 |
2.06% |
1.72 |
1.72% |
1.40 |
1.40% |
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2m |
1.22 |
1.22% |
0.80 |
0.80% |
0.79 |
0.79% |
Table 3: Magnetic Field Measurements in the outside area