Substation - Substation 3236, Dhmosthenous Severi
On the 27th of April 2007 at 9:00 am magnetic field measurements were performed for Substation 3236 Dhmosthenous Severi. The substation of interest is located on Spyridonos Lambrou Street in Nicosia.
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The substation is rated at a nominal power of 1000 KVA. 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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330A |
270A |
330A |
Table 1: Measured Load Current
The resultant load of all three phases was 22% utilisation of the nominal load current.
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 2: ICNIRP Exposure limits for Occupational and General Public exposure
The obtained results for the 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 3236 Dhmosthenous Severi: Fields inside 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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Inside Substation Field Measurements (Distance from Left Inside Wall) |
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0m from Left Side |
54,31 |
10,86% |
92,05 |
18,41% |
23,18 |
4,64% |
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0.5m from Left Side |
96,02 |
19,20% |
35,03 |
7,01% |
14,03 |
2,81% |
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1m from Left Side |
5,84 |
1,17% |
14,50 |
2,90% |
3,81 |
0,76% |
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1.5m from Left Side |
4,92 |
0,98% |
4,85 |
0,97% |
6,19 |
1,24% |
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2m from Left Side |
2,47 |
0,49% |
2,69 |
0,54% |
2,47 |
0,49% |
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2.5m from Left Side |
4,34 |
0,87% |
1,74 |
0,35% |
2,35 |
0,47% |
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3m from Left Side |
4,54 |
0,91% |
7,76 |
1,55% |
6,43 |
1,29% |
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3.5m from Left Side |
4,35 |
0,87% |
11,07 |
2,21% |
14,90 |
2,98% |
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4m from Left Side |
0,76 |
0,15% |
0,87 |
0,17% |
1,61 |
0,32% |
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4.5m from Left Side |
54,31 |
10,86% |
92,05 |
18,41% |
23,18 |
4,64% |
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5m from Left Side |
96,02 |
19,20% |
35,03 |
7,01% |
14,03 |
2,81% |
Table 3: Maximum field measurements inside substation 3236
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Substation 3236 Dhmosthenous Severi: Fields Outside 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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Point A |
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0,34 |
0,34% |
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Point B |
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0,50 |
0,50% |
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Point C |
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0,33 |
0,33% |
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Parking Area Field Measurements |
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0m from Left Side |
0,56 |
0,56% |
0,26 |
0,26% |
0,17 |
0,17% |
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2m from Left Side |
0,58 |
0,58% |
0,24 |
0,24% |
0,16 |
0,16% |
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4m from Left Side |
0,35 |
0,35% |
0,18 |
0,18% |
0,12 |
0,12% |
Table 4: Maximum field measurements outside substation 3236