Substation - Substation 3673, Orianna Court
On the 9th of November 2006 at 9:30 am magnetic field measurements were performed for Substation 3673 Orianna Court. The substation of interest is located on the ground floor of the Orianna Court Building, Eleftheroupoleos Street in Nicosia.
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The substation is rated at a nominal power of 630 KVA. Measurements were performed when the building containing the substation was powered and off. At the time when the measurements were performed and when the building was fully operational, the substation load was recorded as:
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Red Phase |
Yellow Phase |
Blue Phase |
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180A |
140A |
140A |
Table 1: Measured Load Current when building was fully operating
The Resultant load of all three phases as shown is only 17% of the nominal load (630KVA Transformer).
Accordingly the load was also recorded when Orianna Courtn was powered off and is represented in the following table:
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Red Phase |
Yellow Phase |
Blue Phase |
|
180A |
140A |
140A |
Table 2: Measured Load Current when Orianna Court was powered off
By calculating the Resultant load of all three phases as shown above we note that the load is only 19% of the nominal load (630KVA Transformer). It must therefore be noted that during the summer or in periods of peak load the electric and magnetic fields are expected to be higher.
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 3: 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 4 and 5 respectively in the case when Orianna Court is on. A comparison is also made with the ICNIRP recommendations.
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Substation 3673 Orianna Court: Fields Inside Substation when Orianna Court 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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Inside Substation Field Measurements (Distance from Left Inside Wall) |
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0m from Left Side |
207.22 |
41.44% |
111.53 |
22.31% |
59.94 |
11.99% |
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0.5m from Left Side |
98.84 |
19.77% |
61.36 |
12.27% |
42.01 |
8.40% |
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1m from Left Side |
22.23 |
4.45% |
18.25 |
3.65% |
11.25 |
2.25% |
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1.5m from Left Side |
57.95 |
11.59% |
50.20 |
10.04% |
12.95 |
2.59% |
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2m from Left Side |
278.44 |
55.69% |
282.08 |
56.42% |
258.51 |
51.70% |
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2.5m from Left Side |
12.04 |
2.41% |
43.00 |
8.60% |
11.06 |
2.21% |
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3m from Left Side |
13.89 |
2.78% |
17.39 |
3.48% |
2.94 |
0.59% |
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3.5m from Left Side |
14.36 |
2.87% |
10.65 |
2.13% |
2.57 |
0.51% |
Table 4: Maximum Field Measurements inside Substation 3673 (Orianna Court on)
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Substation 3673 Orianna Court: Fields Outside Substation when Orianna Court 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's left side field measurements |
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0m from Left Side |
10.90 |
10.90% |
23.33 |
23.33% |
12.69 |
12.69% |
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1m from Left Side |
3.67 |
3.67% |
3.87 |
3.87% |
2.06 |
2.06% |
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2m from Left Side |
0.99 |
0.99% |
0.88 |
0.88% |
0.70 |
0.70% |
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3m from Left Side |
0.62 |
0.62% |
0.40 |
0.40% |
0.34 |
0.34% |
Table 5: Maximum Field Measurements outside Substation 3673 (Orianna Court on)
Accordingly the obtained results for the RMS fields inside and outside the substation in the case when Orianna Court was powered off, are shown in tables 6 and 7 respectively. A comparison is again made with the ICNIRP recommendations.
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Substation 3673 Orianna Court: Fields Inside Substation when Orianna Court 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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Inside Substation Field Measurements (Distance from Left Inside Wall) |
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0m from Left Side |
25.77 |
5.15% |
89.86 |
17.97% |
30.65 |
6.13% |
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0.5m from Left Side |
76.21 |
15.24% |
40.00 |
8.00% |
39.23 |
7.85% |
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1m from Left Side |
34.33 |
6.87% |
28.83 |
5.77% |
15.63 |
3.13% |
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1.5m from Left Side |
75.87 |
15.17% |
69.52 |
13.90% |
27.15 |
5.43% |
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2m from Left Side |
334.42 |
66.88% |
574.33 |
114.87% |
32.96 |
6.59% |
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2.5m from Left Side |
22.94 |
4.59% |
47.00 |
9.40% |
18.95 |
3.79% |
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3m from Left Side |
19.85 |
3.97% |
18.88 |
3.78% |
2.05 |
0.41% |
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3.5m from Left Side |
18.37 |
3.67% |
6.71 |
1.34% |
2.14 |
0.43% |
Table 6: Maximum Field Measurements inside Substation 3673 (Orianna Court was off)
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Substation 3673 Orianna Court: Fields Outside Substation when Orianna Court 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's left side field measurements |
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0m from Left Side |
18.48 |
18.48% |
23.18 |
23.18% |
4.66 |
4.66% |
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1m from Left Side |
1.95 |
1.95% |
2.05 |
2.05% |
1.05 |
1.05% |
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2m from Left Side |
0.90 |
0.90% |
0.73 |
0.73% |
0.54 |
0.54% |
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3m from Left Side |
0.61 |
0.61% |
0.42 |
0.42% |
0.30 |
0.30% |
Table 7: Maximum Field Measurements outside Substation 3673 (Orianna Court off)
Apartment No.1, above Substation 3673
Apartment No 1 of Orianna Court is situated on the first floor of the building, directly above the substation. Field measurements for this apartment were performed on the 9th of November 2006 at 11:00am.
Magnetic field measurements were performed in the apartment for both the case when power supplied to the building was on and off.
The obtained results for the RMS magnetic fields inside the apartment above the substation, when Orianna Court was on, are shown in table 8 and a comparison is made with the ICNIRP recommendations.
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Apartment No 1: Inside Maximum Field Measurements Building 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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Apartment Inside Field Measurements from Left Side Wall of Bedroom 1 |
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0m from Left Wall |
0.79 |
0.79% |
0.37 |
0.37% |
0.24 |
0.24% |
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1m from Left Wall |
1.27 |
1.27% |
0.47 |
0.47% |
0.23 |
0.23% |
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2m from Left Wall |
0.72 |
0.72% |
0.71 |
0.71% |
0.50 |
0.50% |
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3m from Left Wall |
0.49 |
0.49% |
0.31 |
0.31% |
0.25 |
0.25% |
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Apartment Inside Field Measurements from Right Side Wall of Kitchen |
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0m from Right Wall |
0.30 |
0.30% |
0.50 |
0.50% |
0.63 |
0.63% |
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1m from Right Wall |
0.43 |
0.43% |
0.25 |
0.25% |
0.17 |
0.17% |
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2m from Right Wall |
0.81 |
0.81% |
0.34 |
0.34% |
0.43 |
0.43% |
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3m from Right Wall |
0.30 |
0.35% |
0.19 |
0.19% |
0.28 |
0.28% |
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Apartment Inside Field Measurements Centre of Corridor |
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Center of Room |
0.16 |
0.16% |
-- |
-- |
-- |
-- |
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Apartment Inside Field Measurements Centre of Bathroom |
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Center of Room |
0.20 |
0.20% |
-- |
-- |
-- |
-- |
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Apartment Inside Field Measurements Centre of Living Room |
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Center of Room |
0.17 |
0.17% |
-- |
-- |
-- |
-- |
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Apartment Field Measurements Centre of Veranda |
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Center of Veranda |
0.29 |
0.29% |
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Table 8: Maximum Field Measurements inside Apartment No 1 above SS 3673 (Building on)
Finally the obtained results for the RMS magnetic fields inside the apartment above the substation, when the building was off, are shown in the table below and a comparison is again made with the ICNIRP recommendations.
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Apartment No 1: Inside Maximum Field Measurements Building powered 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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Apartment Inside Field Measurements from Left Side Wall of Bedroom 1 |
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0m from Left Wall |
0.49 |
0.49% |
0.23 |
0.23% |
0.16 |
0.16% |
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1m from Left Wall |
0.66 |
0.66% |
0.31 |
0.31% |
0.24 |
0.24% |
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2m from Left Wall |
0.56 |
0.56% |
0.30 |
0.30% |
0.19 |
0.19% |
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3m from Left Wall |
0.33 |
0.33% |
0.22 |
0.22% |
0.18 |
0.18% |
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Apartment Inside Field Measurements from Right Side Wall of Kitchen |
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0m from Right Wall |
0.38 |
0.38% |
0.28 |
0.28% |
0.23 |
0.23% |
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1m from Right Wall |
0.35 |
0.35% |
0.47 |
0.47% |
0.24 |
0.24% |
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2m from Right Wall |
0.23 |
0.23% |
0.20 |
0.20% |
0.12 |
0.12% |
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3m from Right Wall |
0.12 |
0.12% |
0.19 |
0.19% |
0.13 |
0.13% |
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Apartment Inside Field Measurements Centre of Corridor |
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Center of Room |
0.14 |
0.14% |
-- |
-- |
-- |
-- |
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Apartment Inside Field Measurements Centre of Bathroom |
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Center of Room |
0.20 |
0.20% |
-- |
-- |
-- |
-- |
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Apartment Inside Field Measurements Centre of Living Room |
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Center of Room |
0.17 |
0.17% |
-- |
-- |
-- |
-- |
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Apartment Field Measurements Centre of Veranda |
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Center of Veranda |
0.31 |
0.31% |
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Table 9: Maximum Field Measurements inside Apartment No 1 above SS 3673 (Building powered off)