Substation - Substation 23, Police Department
On the 28th of June 2006 at 12:00 pm, magnetic field measurements were performed for Substation 23. The substation of interest is located on the ground floor of the central police department in Limassol.
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 obtained results for the RMS fields inside and outside the substation are shown in tables 2 and 3 respectively and a comparison is made with the ICNIRP recommendations.
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Fields inside the substation |
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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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0m from Left Side |
14.25 |
2.85% |
8.27 |
1.65% |
2.61 |
0.52% |
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0.5m from Left Side |
66.11 |
13.22% |
33.78 |
6.76% |
8.34 |
1.67% |
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1m from Left Side |
480.06 |
96.01% |
512.39 |
102.48% |
13.35 |
2.67% |
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1.5m from Left Side |
18.48 |
3.70% |
88.06 |
17.61% |
18.08 |
3.62% |
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2m from Left Side |
105.92 |
21.18% |
83.47 |
16.69% |
27.75 |
5.55% |
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2.5m from Left Side |
11.58 |
2.32% |
13.71 |
2.74% |
5.17 |
1.03% |
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3m from Left Side |
18.90 |
3.78% |
25.96 |
5.19% |
17.70 |
3.54% |
Table 2: Maximum field measurements inside substation 23
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Fields outside the substation |
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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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Substation's front side field measurements |
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Point A |
0.46 |
0.46% |
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Point B |
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0.14 |
0.14% |
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Point C |
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0.07 |
0.07% |
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Point D |
0.33 |
0.33% |
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Point E |
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0.11 |
0.11% |
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Point F |
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0.05 |
0.05% |
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Point G |
0.29 |
0.29% |
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Point H |
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0.15 |
0.15% |
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Point I |
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0.05 |
0.05% |
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Substation's left side field measurements |
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Point A |
0.04 |
0.04% |
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Point B |
0.07 |
0.07% |
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Point C |
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0.04 |
0.04% |
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Point D |
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0.06 |
0.06% |
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Point E |
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0.04 |
0.04% |
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Point F |
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0.06 |
0.06% |
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Substation's back side field measurements |
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Point A |
0.11 |
0.11% |
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Point B |
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0.14 |
0.14% |
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Point C |
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0.21 |
0.21% |
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Point E |
0.19 |
0.19% |
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Point F |
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0.23 |
0.23% |
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Point G |
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0.45 |
0.45% |
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Point I |
0.19 |
0.19% |
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Point J |
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0.21 |
0.21% |
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Point K |
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0.40 |
0.40% |
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Substation's back side field measurements at height 2.5m (just below cable tray) |
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Point D |
0.52 |
0.52% |
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Point H |
3.1 |
3.1% |
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Point L |
3.18 |
3.18% |
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Table 3: Maximum field measurements outside substation 23