On the 6th of February 2007 at 9:00 am magnetic field measurements were performed for Substation 3864 SPE Strovolou. The substation of interest is located on the ground floor of the Nikaia 65 Court Building, Prodromou Street in Nicosia. {mosmap width='500' height='400' lat='35.157186' lon='33.344647' zoom='18' zoomtype='large' zoomnew='0' maptype='satellite' showmaptype='1' overview='0' text='substation 3864, SPE Strovolou' tooltip='dwo' marker='1' align='center' key='abqiaaaa03cwbwhnzyjizsn-wwdqmhqctkyp5l8hb2mjngvvfkvpdgzbixqkqitrafigip chx6gplphdidvzga'} Σελίδα 1 / 16
The substation is rated at a nominal power of 800 KVA. At the time when the measurements were performed the substation load was recorded as: Red Phase Yellow Phase Σελίδα 2 / 16
Blue Phase 430A 480A 390A Table 1: Measured load current The resultant load of all three phases was 39% 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. Reference levels for Occupational exposure ICNIRP Frequency Electric Field Strength, E (V/m) Magnetic Field Strength, H (A/m) Magnetic Flux Density, B (µt) 50 Hz 10000 400 500 Reference levels for General Public exposure ICNIRP Frequency Electric Field Strength, E (V/m) Magnetic Field Strength, H (A/m) Σελίδα 3 / 16
Magnetic Flux Density, B (µt) 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. Substation 3864 SPE Strovolou: Fields Inside Substation Distance from Side (m) Maximum Magnetic Field (µt) at Z Height (m Percentage of ICNIRP Occupational Standard (%) ) 0.3m 1m 1.75 m Inside SubStation Field Measurements 0m from Front Side 1,42 0,28% Σελίδα 4 / 16
1,56 0,31% 1,36 0,27% 0.5m from Front Side 2,56 0,51% 2,68 0,54% 2,47 0,49% 1m from Front Side 30,32 6,06% 11,36 2,27% 6,89 1,38% 1.5m from Front Side 22,98 4,60% 136,78 27,36% 14,84 Σελίδα 5 / 16
2,97% 2m from Front Side 78,85 15,77% 333,44 66,69% 41,06 8,21% 2.5m from Front Side 490,72 98,14% 247,05 49,41% 107,28 21,46% 3m from Front Side 252,03 50,41% 196,17 39,23% 245,28 49,06% 3.5m from Front Side 31,06 6,21% Σελίδα 6 / 16
45,31 9,06% 20,15 4,03% Table 3: Maximum field measurements inside Substation 3864 Substation 3864 SPE Strovolou: Fields Outside Substation Distance from Side (m) Maximum Magnetic Field (µt) at Z Height (m) Percentage of ICNIRP General Public Standard (%) 0.3m 1m 1.75 m SubStation Front Side Field Measurements 0m from Front Side 0,53 0,53% 0,46 0,46% 0,38 0,38% Σελίδα 7 / 16
1m from Front Side 0,45 0,45% 0,20 0,20% 0,18 0,18% Substation Right Side Field Measurements 0m from Right Side 22,52 22,52% 50,25 50,25% 12,08 12,08% 1m from Right Side 2,69 2,69% 3,15 3,15% 2,41 2,41% 2m from Right Side Σελίδα 8 / 16
1,19 1,19% 1,21 1,21% 0,84 0,84% Substation Back Side Field Measurements 0m from Back Side 4,05 4,05% 6,77 6,77% 4,59 4,59% 1m from Back Side 0,70 0,70% 1,05 1,05% 0,76 0,76% 2m from Back Side 0,25 0,25% 0,27 Σελίδα 9 / 16
0,27% 0,24 0,24% Table 4: Maximum field measurements outside Substation 3864 Apartment M2 / Apartment above Substation 3864 Apartment M2 of Nikaia 65 Court Nicosia is situated at the first floor of the building, directly above Substation 3864 SPE Strovolou, at Prodromou Street Nicosia. Field measurements for this apartment were performed on the 2nd of March 2007 at 11:00am. Σελίδα 10 / 16
The obtained results for the RMS magnetic fields inside the referenced apartment are shown in table 5 and a comparison is made with the ICNIRP recommendations. Apartment M2 : Inside Maximum Field Measurements Distance from Side (m) Maximum Magnetic Field (µt) at Z Height (m) Percentage of ICNIRP General Public Standard (%) Σελίδα 11 / 16
0.3m 1m 1.75 m Apartment Inside Field Measurements from Left Side Wall of Bedroom 1 0m from Left Wall 0,68 0,68% 0,28 0,28% 0,45 0,45% 0.5m from Left Wall 0,59 0,59% 0,33 0,33% 0,16 0,16% 1m from Left Wall 0,56 Σελίδα 12 / 16
0,56% 0,28 0,28% 0,17 0,17% 1.5m from Left Wall 0,28 0,28% 0,26 0,26% 0,15 0,15% 2m from Left Wall 0,24 0,24% 0,22 0,22% 0,15 0,15% 2.5m from Left Wall 0,24 0,24% 0,20 0,20% Σελίδα 13 / 16
0,15 0,15% 3m from Left Wall 0,62 0,62% 0,22 0,22% 0,16 0,16% Apartment Inside Field Measurements from Right Side Wall of Kitchen 0m from Right Wall 0,81 0,81% 0,35 0,35% 0,35 0,35% 0.5m from Right Wall 0,80 0,80% 0,30 0,30% 0,17 0,17% Σελίδα 14 / 16
1m from Right Wall 1,19 1,19% 0,40 0,40% 0,15 0,15% 21.5m from Right Wall 1,01 1,01% 0,42 0,42% 0,19 0,19% 2m from Right Wall 0,79 0,79% 0,32 0,32% 0,17 0,17% Apartment Inside Field Measurements Centre of Corridor Centre of Room 0.97 Σελίδα 15 / 16
0.97% Apartment Inside Field Measurements Centre of Entrance Hall Centre of Room 0.27 0.27% Apartment Inside Field Measurements Centre of Living Room Centre of Room 0.08 0.08% Apartment Field Measurements Centre of Veranda Centre of Room 0.15 0.15% Table 5: Maximum field measurements in the apartment above Substation 3864 Σελίδα 16 / 16