Substation - Substation 3136, Alexandrou Ypsilanti
On the 23rd of October 2006 at 10:00am, magnetic field measurements were performed for Substation 3136 Alexandrou Ypsilanti. The substation of interest is located in an area along the main road of Latsia towards Geri in Nicosia.
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The substation is rated at a nominal power of 315 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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60A |
50A |
40A |
Table 1: Measured Load Current
The resultant load of all three phases was 11% 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 3136 Alexandrou Ypsilanti: 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 |
29,52 |
5,90% |
40,54 |
8,11% |
25,84 |
5,17% |
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0.5m from Left Side |
14,55 |
2,91% |
19,39 |
3,88% |
25,04 |
5,01% |
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1m from Left Side |
12,90 |
2,58% |
9,54 |
1,91% |
15,95 |
3,19% |
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1.5m from Left Side |
11,27 |
2,25% |
4,71 |
0,94% |
2,95 |
0,59% |
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2m from Left Side |
32,01 |
6,40% |
13,25 |
2,65% |
6,19 |
1,24% |
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2.5m from Left Side |
228,93 |
45,79% |
63,82 |
12,76% |
2,76 |
0,55% |
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3m from Left Side |
7,23 |
1,45% |
7,97 |
1,59% |
3,72 |
0,74% |
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3.5m from Left Side |
1,82 |
0,36% |
1,25 |
0,25% |
0,84 |
0,17% |
Table 3: Maximum field measurements inside substation 3136
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Substation 3136 Alexandrou Ypsilanti: 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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0m from Front Side |
0,58 |
0,58% |
0,65 |
0,65% |
0,62 |
0,62% |
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1m from Front Side |
0,59 |
0,59% |
0,51 |
0,51% |
0,51 |
0,51% |
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Substation Left Side Field Measurements |
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0m from Left Side |
3,29 |
3,29% |
5,70 |
5,70% |
7,08 |
7,08% |
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1m from Left Side |
0,62 |
0,62% |
1,12 |
1,12% |
1,74 |
1,74% |
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Substation Right Side Field Measurements |
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0m from Right Side |
0,41 |
0,41% |
0,62 |
0,62% |
0,55 |
0,55% |
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1m from Right Side |
0,45 |
0,45% |
0,46 |
0,46% |
0,49 |
0,49% |
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Substation Back Side Field Measurements |
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0m from Back Side |
0,37 |
0,37% |
0,31 |
0,31% |
0,34 |
0,34% |
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1m from Back Side |
0,34 |
0,34% |
0,34 |
0,34% |
0,36 |
0,36% |
Table 4: Maximum field measurements outside substation 3136