On the 10th of April 2008 at 09:00 am electric and magnetic field measurements were performed for residence 35 Archiepiskopou Kyprianou Street in Larnaca and substation English Cemetery.
| Red Phase | Yellow Phase | Blue Phase |
|
40A |
65A |
70A |
Table 1: Measured Load Current
From the resultant load of all three phases as shown above we note that the load is only 6.7% of the nominal load (630 KVA Transformer).
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.
|
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) |
|
50 Hz |
10000 |
400 |
500 |
|
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) |
|
50 Hz |
5000 |
80 |
100 |
Table 2: ICNIRP Exposure limits for Occupational and General Public exposure
A detailed description of the maximum measured magnetic fields inside the residence is shown in the following table. A comparison is also made with the ICNIRP recommendations.
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Residence Field Measurements |
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|
Measurement Point |
Maximum Magnetic Field /µT at Z Height /m -Percentage of ICNIRP General Public Standard /% |
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|
0.3m |
ICNIRP % |
1 m |
ICNIRP % |
1.75 m |
ICNIRP % |
|
|
Residence Garden-Outside Area |
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|
Measurement Point A |
-- |
-- |
0.011 |
0.011% |
-- |
-- |
|
Residence Kitchen-Inside Area |
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|
Measurement Point A |
-- |
-- |
0.009 |
0.009% |
-- |
-- |
|
Residence Bedroom-Inside Area |
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|
Measurement Point A |
-- |
-- |
0.011 |
0.011% |
-- |
-- |
|
Bedroom Veranda-Outside Area |
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|
Measurement Point A |
-- |
-- |
0.027 |
0.027% |
-- |
-- |
|
0m of in front of Garden Wall |
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|
0m from SP* |
0.012 |
0.012% |
0.013 |
0.013% |
0.013 |
0.013% |
|
1m from SP* |
0.010 |
0.010% |
0.010 |
0.010% |
0.010 |
0.010% |
|
2m from SP* |
0.008 |
0.008% |
0.009 |
0.009% |
0.009 |
0.009% |
Table 3: Residence Maximum Field Measurements – Inside and Outside Area.
*SP- Starting Point
Accordingly a detailed description of the maximum field results that were measured inside and outside the substation is provided in the following tables.
|
Substation English Cemetery: Magnetic Field Measurements Outside the Substation |
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|
Distance /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 % |
|
|
0m away the substation front side |
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|
0m from SP* |
1.159 |
1.16% |
0.664 |
0.66% |
0.406 |
0.41% |
|
1m from SP |
1.698 |
1.70% |
0.646 |
0.65% |
0.310 |
0.31% |
|
2m from SP |
0.855 |
0.85% |
0.461 |
0.46% |
0.301 |
0.30% |
|
3m from SP |
0.641 |
0.64% |
0.331 |
0.33% |
0.264 |
0.26% |
|
4m from SP |
0.538 |
0.54% |
0.334 |
0.33% |
0.257 |
0.26% |
|
1.5m away the substation front side |
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|
0m from SP |
1.353 |
1.35% |
0.509 |
0.51% |
0.299 |
0.30% |
|
1m from SP |
1.226 |
1.23% |
0.480 |
0.48% |
0.254 |
0.25% |
|
2m from SP |
0.595 |
0.59% |
0.323 |
0.32% |
0.212 |
0.21% |
|
3m from SP |
0.310 |
0.31% |
0.213 |
0.21% |
0.166 |
0.17% |
|
4m from SP |
0.264 |
0.26% |
0.239 |
0.24% |
0.204 |
0.20% |
|
3m away the substation front side |
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|
0m from SP |
0.432 |
0.43% |
0.308 |
0.31% |
0.194 |
0.19% |
|
1m from SP |
0.320 |
0.32% |
0.211 |
0.21% |
0.157 |
0.16% |
|
2m from SP |
0.220 |
0.22% |
0.152 |
0.15% |
0.122 |
0.12% |
|
3m from SP |
0.140 |
0.14% |
0.116 |
0.12% |
0.088 |
0.09% |
|
4m from SP |
0.097 |
0.10% |
0.090 |
0.09% |
0.078 |
0.08% |
|
0m away the substation right side |
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|
0m from SP |
0.158 |
0.16% |
0.122 |
0.12% |
0.094 |
0.09% |
|
1m from SP |
0.417 |
0.42% |
0.214 |
0.21% |
0.181 |
0.18% |
|
2m from SP |
0.908 |
0.91% |
0.685 |
0.68% |
0.542 |
0.54% |
|
3m from SP |
4.929 |
4.93% |
3.517 |
3.52% |
3.414 |
3.41% |
|
4m from SP |
6.177 |
6.18% |
4.098 |
4.10% |
3.209 |
3.21% |
|
5m from SP |
1.484 |
1.48% |
0.964 |
0.96% |
0.570 |
0.57% |
|
1m away the substation right side |
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|
0m from SP |
0.091 |
0.09% |
0.121 |
0.12% |
0.116 |
0.12% |
|
1m from SP |
0.144 |
0.14% |
0.100 |
0.10% |
0.076 |
0.08% |
|
2m from SP |
0.180 |
0.18% |
0.173 |
0.17% |
0.157 |
0.16% |
|
3m from SP |
0.510 |
0.51% |
0.508 |
0.51% |
0.306 |
0.31% |
|
4m from SP |
0.634 |
0.63% |
0.650 |
0.65% |
0.528 |
0.53% |
|
5m from SP |
0.888 |
0.89% |
0.567 |
0.57% |
0.363 |
0.36% |
|
0m away the substation left side |
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|
0m from SP |
0.208 |
0.21% |
0.168 |
0.17% |
0.127 |
0.13% |
|
1m from SP |
0.464 |
0.46% |
0.304 |
0.30% |
0.227 |
0.23% |
|
2m from SP |
0.624 |
0.62% |
0.496 |
0.50% |
0.387 |
0.39% |
|
3m from SP |
0.732 |
0.73% |
0.628 |
0.63% |
0.469 |
0.47% |
|
4m from SP |
0.858 |
0.86% |
0.575 |
0.58% |
0.386 |
0.39% |
|
5m from SP |
0.567 |
0.57% |
0.436 |
0.44% |
0.305 |
0.31% |
|
1m away the substation left side |
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|
0m from SP |
0.083 |
0.08% |
0.087 |
0.09% |
0.076 |
0.08% |
|
1m from SP |
0.137 |
0.14% |
0.134 |
0.13% |
0.110 |
0.11% |
|
2m from SP |
0.218 |
0.22% |
0.169 |
0.17% |
0.118 |
0.12% |
|
3m from SP |
0.194 |
0.19% |
0.180 |
0.18% |
0.144 |
0.14% |
|
4m from SP |
0.185 |
0.18% |
0.176 |
0.18% |
0.153 |
0.15% |
|
5m from SP |
0.205 |
0.20% |
0.163 |
0.16% |
0.138 |
0.14% |
|
0m away the substation back side |
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|
0m from SP |
0.163 |
0.16% |
0.120 |
0.12% |
0.092 |
0.09% |
|
1m from SP |
0.275 |
0.27% |
0.161 |
0.16% |
0.125 |
0.12% |
|
2m from SP |
0.471 |
0.47% |
0.303 |
0.30% |
0.199 |
0.20% |
|
3m from SP |
0.501 |
0.50% |
0.341 |
0.34% |
0.235 |
0.24% |
|
4m from SP |
0.307 |
0.31% |
0.221 |
0.22% |
0.152 |
0.15% |
|
1m away the substation back side |
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|
0m from SP |
0.109 |
0.11% |
0.092 |
0.09% |
0.082 |
0.08% |
|
1m from SP |
0.153 |
0.15% |
0.114 |
0.11% |
0.083 |
0.08% |
|
2m from SP |
0.152 |
0.15% |
0.119 |
0.12% |
0.103 |
0.10% |
|
3m from SP |
0.164 |
0.16% |
0.136 |
0.14% |
0.107 |
0.11% |
|
4m from SP |
0.127 |
0.13% |
0.111 |
0.11% |
0.082 |
0.08% |
Table 4: Substation English Cemetery Maximum Field Measurements-Outside substation
|
Substation English Cemetery: Magnetic Field Measurements Inside the Substation |
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| Distance /m |
Maximum Magnetic Field at Z Height /m - Percentage of ICNIRP Occupational Standard /% |
|||||
|
0.3m |
ICNIRP % |
1m |
ICNIRP % |
1.75m |
ICNIRP % |
|
|
Measurement Point A |
-- |
-- |
38.46 |
7.69% |
-- |
-- |
|
Measurement Point B |
-- |
-- |
2.297 |
0.46% |
-- |
-- |
|
Measurement Point C |
-- |
-- |
35.18 |
7.04% |
-- |
-- |