Substation - Specific Equipment and Area / EAC District Office Substation
On the 13th of April 2007 at 10:00 am magnetic field measurements were performed for the District Office Substation. The substation of interest is located on Mykhnon Street in Nicosia.
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Figure 1: EAC District Office |
Figure 2: EAC District Office outside |
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 in the case when the substation is on. A comparison is also made with the ICNIRP recommendations.
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District Office Substation: Fields Inside Substation when building was on |
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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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Basement Field Measurements (Distance from Left Inside Wall) |
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2m from Left Side |
2,82 |
0,56% |
0,95 |
0,19% |
0,53 |
0,11% |
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4m from Left Side |
2,48 |
0,50% |
1,37 |
0,27% |
0,94 |
0,19% |
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Transformer Room 1 Field Measurements (Distance from Right Inside Wall) |
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3m from Right Side |
0,43 |
0,09% |
0,29 |
0,06% |
0,43 |
0,09% |
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5m from Right Side |
0,44 |
0,09% |
0,41 |
0,08% |
0,43 |
0,09% |
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9m from Right Side |
1,15 |
0,23% |
0,41 |
0,08% |
0,42 |
0,08% |
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Transformer Room 2 Field Measurements (Distance from Right Inside Wall) |
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3m from Right Side |
0,40 |
0,08% |
0,29 |
0,06% |
0,43 |
0,09% |
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5m from Right Side |
0,49 |
0,10% |
0,61 |
0,12% |
0,50 |
0,10% |
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9m from Right Side |
0,60 |
0,12% |
0,40 |
0,08% |
0,32 |
0,06% |
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Transformer Room 3 Field Measurements (Distance from Right Inside Wall) |
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3m from Right Side |
0,22 |
0,04% |
0,24 |
0,05% |
0,50 |
0,10% |
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5m from Right Side |
0,47 |
0,09% |
0,56 |
0,11% |
0,76 |
0,15% |
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9m from Right Side |
0,52 |
0,10% |
0,72 |
0,14% |
1,02 |
0,20% |
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Floor 1 Room Field Measurements |
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Behind of 22-11KV Switchgear A |
0,07 |
0,01% |
0,09 |
0,02% |
0,13 |
0,03% |
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In Front of 22-11KV Switchgear A |
0,04 |
0,01% |
0,03 |
0,01% |
0,03 |
0,01% |
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Behind of 22-11KV Switchgear B |
0,04 |
0,01% |
0,03 |
0,01% |
0,02 |
0,00% |
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In Front of 22-11KV Switchgear B |
0,06 |
0,01% |
0,04 |
0,01% |
0,03 |
0,01% |
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Behind of Switchgear 132KV |
0,41 |
0,08% |
0,29 |
0,06% |
0,19 |
0,04% |
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In Front Switchgear 132KV |
0,21 |
0,04% |
0,15 |
0,03% |
0,16 |
0,03% |
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Control Room Field Measurements |
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In Front of Control Systems |
0,15 |
0,03% |
0,10 |
0,02% |
0,08 |
0,02% |
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Point A |
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0,46 |
0,09% |
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Point B |
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0,16 |
0,03% |
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Point C |
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0,12 |
0,02% |
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Table 3: Maximum Field Measurements inside District Office Substation (substation on)
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District Office Substation: Fields Outside Substation when building was on |
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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 Left Side Field Measurements |
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Left Outside Wall |
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2,22 |
2,22% |
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Back Outside Wall |
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0,08 |
0,08% |
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Right Outside Wall |
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0,15 |
0,15% |
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Front Outside Wall |
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0,48 |
0,48% |
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Table 4: Maximum Field Measurements outside District Office Substation (substation on)
Accordingly the obtained results for the RMS fields inside and outside the substation in the case when District office Substation was powered off, are shown in tables 5 and 6 respectively. A comparison is again made with the ICNIRP recommendations.
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District Office Substation: Fields Inside Substation when building was off |
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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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Basement Field Measurements (Distance from Left Inside Wall) |
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2m from Left Side |
0,03 |
0,006% |
0,03 |
0,005% |
0,04 |
0,008% |
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4m from Left Side |
0,04 |
0,008% |
0,04 |
0,007% |
0,05 |
0,011% |
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Transformer Room 1 Field Measurements (Distance from Right Inside Wall) |
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3m from Right Side |
0,05 |
0,009% |
0,03 |
0,007% |
0,10 |
0,020% |
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5m from Right Side |
0,03 |
0,006% |
0,03 |
0,006% |
0,06 |
0,011% |
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9m from Right Side |
0,09 |
0,018% |
0,03 |
0,007% |
0,02 |
0,005% |
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Transformer Room 2 Field Measurements (Distance from Right Inside Wall) |
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3m from Right Side |
0,02 |
0,004% |
0,03 |
0,005% |
0,05 |
0,009% |
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5m from Right Side |
0,04 |
0,008% |
0,05 |
0,009% |
0,10 |
0,019% |
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9m from Right Side |
0,04 |
0,008% |
0,03 |
0,006% |
0,03 |
0,006% |
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Transformer Room 3 Field Measurements (Distance from Right Inside Wall) |
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3m from Right Side |
0,04 |
0,009% |
0,04 |
0,008% |
0,06 |
0,013% |
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5m from Right Side |
0,05 |
0,009% |
0,04 |
0,008% |
0,14 |
0,028% |
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9m from Right Side |
0,06 |
0,012% |
0,05 |
0,010% |
0,06 |
0,011% |
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Floor 1 Room Field Measurements |
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Behind of 22-11KV Switchgear A |
0,03 |
0,007% |
0,10 |
0,020% |
0,14 |
0,028% |
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In Front of 22-11KV Switchgear A |
0,01 |
0,002% |
0,01 |
0,001% |
0,01 |
0,002% |
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Behind of 22-11KV Switchgear B |
0,02 |
0,004% |
0,02 |
0,005% |
0,06 |
0,012% |
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In Front of 22-11KV Switchgear B |
0,03 |
0,006% |
0,03 |
0,005% |
0,03 |
0,006% |
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Behind of Switchgear 132KV |
0,01 |
0,002% |
0,02 |
0,004% |
0,02 |
0,004% |
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In Front Switchgear 132KV |
0,02 |
0,005% |
0,03 |
0,005% |
0,03 |
0,006% |
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Control Room Field Measurements |
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In Front of Control Systems |
0,11 |
0,02% |
0,093 |
0,019% |
0,07 |
0,01% |
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Point A |
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0,69 |
0,138% |
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Point B |
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0,13 |
0,026% |
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Point C |
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0,13 |
0,026% |
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Table 5: Maximum Field Measurements inside District Office Substation (substation off)
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District Office Substation: Fields Outside Substation when building was off |
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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 Left Side Field Measurements |
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Left Outside Wall |
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1,77 |
1,77% |
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Back Outside Wall |
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0,04 |
0,04% |
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Right Outside Wall |
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0,10 |
0,10% |
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Front Outside Wall |
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0,41 |
0,41% |
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Table 6: Maximum Field Measurements outside District Office Substation (substation off)