Substation - Substation 3087, Akritas Tower
On the 17th of March 2006 at 11:30am, electric and magnetic field measurements were performed on Substation 3087 at Akritas Tower. This substation is located on the ground floor of the Akritas Tower building, Kleomenous street in Nicosia.
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The substation is rated at a nominal power of 1000 KVA but the maximum observed values during the year were usually not greater than 800KVA.
At the time when the measurements were performed, the substation load power was recorded as:
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Red Phase |
Yellow Phase |
Blue Phase |
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400A |
370A |
400A |
Table 1: Measured load current
The resultant load of all three phases was 28% utilization of the nominal load current.
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 obtained results for the RMS fields inside and outside the substation are shown in tables 3 and 4 respectively, and a comparison is made with the ICNIRP recommendations.
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Substation 3087 Akritas Tower: Fields inside the substation |
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Field Description |
Position at height 1m |
Value (µT) |
ICNIRP |
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Magnetic Field (µT) |
In front of Pindaros switch at a distance of 0m |
1,462 |
0,29% |
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In front of Geogkas-Krentos switch at a distance of 0m |
15,57 |
3,11% |
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In front of Sofoklhs Hliadhs supply at a distance of 0m |
41,96 |
8,39% |
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In front of L.V. pillar fuses at a distance of 0m |
84,24 |
16,85% |
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In front of L.V. pillar bus bar at a distance of 0m |
329,1 |
65,82% |
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In front of transformer 415V Cables at a distance of 0m |
543,2 |
108,64% |
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In front of transformer 11,000V Cables at a distance of 0m |
14,9 |
2,98% |
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In front of cables entering the SS at a distance of 0m |
17,55 |
3,51% |
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Table 3: Maximum field strength measurements inside Substation 3087
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Substation 3087 Akritas Tower: 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 front side field measurements |
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0m from front side |
-- |
-- |
0,494 |
0,49% |
-- |
-- |
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Substation left side field measurements |
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0m from left side |
1,0022 |
1,00% |
0,5286 |
0,53% |
0,27653 |
0,28% |
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1m from left side |
0,55406 |
0,55% |
0,33297 |
0,33% |
0,23837 |
0,24% |
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2m from left side |
0,34769 |
0,35% |
0,25687 |
0,26% |
0,19956 |
0,20% |
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Substation right side field measurements |
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0m from right side |
15,2 |
15.20% |
-- |
-- |
-- |
-- |
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1m from right side |
9,6423 |
9,64% |
7,4602 |
7,46% |
3,3841 |
3,38% |
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2.5m from right side |
1,8094 |
1,81% |
1,3242 |
1,32% |
1,06 |
1,06% |
Table 4: Maximum field strength measurements outside Substation 3087
Shop No.3, above the substation
Shop No.3 of Akritas Tower is situated on the ground floor of the building, directly above Substation 3087. Field measurements for this shop were performed on the 17th of March 2006 at 12:30pm.
The obtained measurements for the RMS fields strength inside and outside the referenced shop are shown in tables 5 and 6 respectively and a comparison is made with the ICNIRP recommendations.
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Shop Above Substation 3087: Maximum field measurements inside the shop |
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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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Shop's inside field measurements from front side obstacle |
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0m from obstacle 1 |
1,5634 |
1,56% |
0,74794 |
0,75% |
0,42218 |
0,42% |
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2m from obstacle 1 |
1,2798 |
1,28% |
0,52198 |
0,52% |
0,27011 |
0,27% |
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3.5m from obstacle 1 |
0,6764 |
0,68% |
0,24153 |
0,24% |
0,26928 |
0,27% |
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Shop's inside field measurement points A, B, C and D |
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Point A |
0,246 |
0,25% |
-- |
-- |
-- |
-- |
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Point B |
0,255 |
0,26% |
-- |
-- |
-- |
-- |
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Point C |
0,646 |
0,65% |
-- |
-- |
-- |
-- |
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Point D |
0,191 |
0,19% |
-- |
-- |
-- |
-- |
Table 5: Maximum field strength measurements inside the shop, above Substation 3087
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Shop above Substation 3087: Maximum field measurements outside |
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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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Shop's front side field measurements |
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0m from front side |
0,66571 |
0,67% |
0,43626 |
0,44% |
0,70159 |
0,70% |
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2m from front side |
0,55319 |
0,55% |
0,31736 |
0,32% |
0,26542 |
0,27% |
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4m from front side |
0,82865 |
0,83% |
0,40085 |
0,40% |
0,29168 |
0,29% |
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Shop's left side field measurements |
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0m from left side |
0,47679 |
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Shop's back side field measurements |
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0m from back side |
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Table 6: Maximum field strength measurements outside the shop, above Substation 3087