Substation Petros Eliades
The measurements were performed for the Petros Eliades distribution substation located in Nicosia on the 22th of July 2009 at 15:00 pm.
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Figure 1: Substation back side |
Figure 2: Underground cable-Front side |
The substation is rated at a nominal power of 600 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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209 A |
181 A |
180 A |
Table 1: Measured load current
The resultant load of all three phases was 22.8 % 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 maximum obtained values are represented below and compared to the ICNIRP specified limits of General Public standards. The highest magnetic field value outside was observed 0m away from the front side of the distribution transformer, with a value 6.84 μT (2 m away from the starting point) and a percentage of 6.84 % as compared to the ICNIRP General Public standard.
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Outside Field Measurements |
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Distance from Side /m |
Maximum Magnetic Field at Z Height /m - Percentage of ICNIRP General Public Standard /% |
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0.3m |
ICNIRP % |
1m |
ICNIRP % |
1.75m |
ICNIRP % |
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Outside Substation Field Measurements - Front side |
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0m |
6.84 |
6.84% |
3.38 |
3.38% |
4.48 |
4.48% |
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1m |
0.8 |
0.80% |
0.49 |
0.49% |
0.54 |
0.54% |
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2m |
0.27 |
0.27% |
0.37 |
0.37% |
0.16 |
0.26% |
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3m |
0.74 |
0.74% |
0.3 |
0.30% |
0.18 |
0.18% |
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Outside Substation Field Measurements - Left side |
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0m |
1.92 |
1.92% |
2.04 |
2.04% |
1.91 |
1.91% |
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1m |
0.38 |
0.38% |
0.47 |
0.47% |
0.35 |
0.35% |
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2m |
0.15 |
0.15% |
0.37 |
0.37% |
0.14 |
0.14% |
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Outside Substation Field Measurements - Right side |
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0m |
1.29 |
1.29% |
2.46 |
2.46% |
2.08 |
2.08% |
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1m |
0.32 |
0.32% |
0.28 |
0.28% |
0.32 |
0.32% |
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2m |
0.11 |
0.11% |
0.14 |
0.14% |
0.12 |
0.12% |
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Outside Substation Field Measurements - Back side |
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0m |
2.98 |
2.98% |
1.51 |
1.51% |
1.24 |
1.24% |
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1m |
0.28 |
0.28% |
0.02 |
0.20% |
0.2 |
0.20% |
Table 3: Magnetic Field Measurements in the outside area