Pole Mounted Transformer - 16 Pentasxinos street, Agios Theodoros
The measured substation/residense is located in Pentasxinos street in Ayia Napa. The measurements were performed on the 24th of July 2009 at 09:00 am.
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Figure 1: Pole mounted transformer “Eleni Pilavaki” |
Figure 2: Inside the residence - Kitchen |
The pole mounted transformer is rated at a nominal power of 50 KVA. At the time when the measurements were performed the transformer load was recorded as:
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Red Phase |
Yellow Phase |
Blue Phase |
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20 A |
0 A |
0 A |
Table 1: Measured load current
From the resultant load of all three phases as shown above we note that the load is only 9.6 % of the nominal load (50 KVA Transformer).
Limiting exposure values have been provided by the ICNIRP recommendations and are guidelines to many countries and organizations. 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 2: ICNIRP Exposure limits for Occupational and General Public exposure
The maximum obtained values are represented below and compared to the ICNIRP limits. The highest magnetic field inside was observed in the residence kitchen, with a value 0.69 μT and a percentage of 0.69 % as compared to the ICNIRP General Public standard.
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Inside Residence 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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Measurements inside the residence - Kitchen |
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Point A |
-- |
-- |
0.69 |
0.69% |
-- |
-- |
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Measurements inside the residence - Living room |
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Point B |
-- |
-- |
0.03 |
0.03% |
-- |
-- |
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Measurements inside the residence - 1st Bedroom |
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Point C |
-- |
-- |
0.01 |
0.01% |
-- |
-- |
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Measurements inside the residence - 2nd Bedroom |
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Point D |
-- |
-- |
0.01 |
0.01% |
-- |
-- |
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Measurements inside the residence - Bathroom |
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Point E |
-- |
-- |
0.01 |
0.01% |
-- |
-- |
Table 3: Magnetic Field Measurements inside area
Accordingly the highest magnetic field value outside was observed in the veranda on the first floor, with a value 0.05 μT and a percentage of 0.05 % as compared to the ICNIRP General Public standard. The following table summarizes the highest magnetic field values measured outside.
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Outside Residence 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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Measurements outside the residence-Veranda |
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Measurement Point F |
-- |
-- |
-- |
-- |
0.05 |
0.05% |
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Pole mounted transformer - Front side |
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0m away from front side |
0.02 |
0.02% |
0.03 |
0.03% |
0.04 |
0.04% |
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1m away from front side |
0.02 |
0.02% |
0.03 |
0.03% |
0.03 |
0.03% |
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2m away from front side |
0.01 |
0.01% |
0.03 |
0.03% |
0.03 |
0.03% |
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3m away from front side |
0.02 |
0.02% |
0.03 |
0.03% |
0.03 |
0.03% |
Table 4: Magnetic Field Measurements in the outside area
Additionally, the highest electric field value outside was observed directly in front of the pole mounted transformer “Eleni Pilavaki”, with a value 12.65 V/m and a percentage of 0.25 % as compared to the ICNIRP General Public standard. The following table summarizes the electric field values measured outside.
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Outside Residence Electric Field Measurements |
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Distance from Side /m |
Maximum Electric 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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Outside Substation Field Measurements - Front side |
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Measurement Point G |
-- |
-- |
-- |
-- |
12.65 |
0.25% |
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Measurement Point H |
-- |
-- |
-- |
-- |
6.32 |
0.13% |
Table 5: Electric Field Measurements in the outside area