Substation - Substation 383, Limassol District Administration
On the of 22nd October 2010 at 09:00 am magnetic field measurements were performed for the Limassol District Administration, 159 Anexartisias Street in Limassol and substation No. 383.
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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 1 MVA. 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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559 A |
486 A |
449 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 34 % of the nominal load (1 MVA 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 maximum obtained values are represented below and compared to the ICNIRP limits. The highest magnetic field inside was observed in the office area, with a value 0.12 μT and a percentage of 0.12 % as compared to the ICNIRP General Public standard.
A detailed description of the maximum measured magnetic fields inside the Limassol District Administration 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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Limasso Distric Administration - Office Area |
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Point A |
-- |
-- |
0.12 |
0.12% |
-- |
-- |
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Residence - Kitchen Area |
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Point B |
-- |
-- |
0.08 |
0.08% |
-- |
-- |
Table 2: Magnetic Field Measurements inside area
Accordingly the highest magnetic field value outside was observed 0m away from the substation’s front side (2m from the starting point), with a value 26.26 μT and a percentage of 26.26 % 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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Substation - Front side |
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0m away from side |
26.26 |
26.26% |
15.33 |
15.33% |
9.85 |
9.85% |
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1m away from side |
4.09 |
4.09% |
3.79 |
3.79% |
3.00 |
3.00% |
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2m away from side |
1.57 |
1.57% |
1.47 |
1.47% |
1.30 |
1.30% |
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3m away from side |
0.72 |
0.72% |
0.61 |
0.61% |
0.70 |
0.70% |
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4m away from side |
0.33 |
0.33% |
0.35 |
0.35% |
0.38 |
0.38% |
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Substation - Left Side |
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0m away from side |
3.93 |
3.93% |
1.81 |
1.81% |
1.82 |
1.82% |
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1m away from side |
1.30 |
1.30% |
0.85 |
0.85% |
0.73 |
0.73% |
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2m away from side |
0.66 |
0.66% |
0.71 |
0.71% |
0.39 |
0.39% |
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Substation - Right Side |
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Measurement point E |
-- |
-- |
3.98 |
3.98% |
-- |
-- |
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Substation Right Side - Residence Garden |
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Measurement point F |
- |
-- |
0.41 |
0.41% |
-- |
-- |
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Substation Right Side - Kitchen´s Door |
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Measurement point G |
-- |
-- |
0.15 |
0.15% |
-- |
-- |
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Outsede the Limassol Distric Administration - Substation Left Wall |
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Measurement point B |
-- |
-- |
0.09 |
0.09% |
-- |
-- |
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Outsede the Limassol Distric Administration - Middle of Parking Area |
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Measurement point C |
-- |
-- |
0.60 |
0.60% |
-- |
-- |
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Outsede the Limassol Distric Administration - Left Side |
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Measurement point D |
-- |
-- |
0.30 |
0.30% |
-- |
-- |
Table 3: Magnetic Field Measurements in the outside area