On the 30th of November 2007 at 10:00 am electric and magnetic field measurements were performed for EAC Moni Power Station.Two sets of measurements were performed. The first set was performed in the area inside the power station and the second set was performed in the area outside the station.
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) |
|
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) |
|
50 Hz |
5000 |
80 |
100 |
Table 1: ICNIRP exposure limits for Occupational and General public exposure
The obtained results for the RMS fields inside and outside the power station are shown in tables 2 and 3 respectively. A comparison is also made with the ICNIRP recommendations.
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Fields inside the power station |
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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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|
Power station control room |
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|
Point A |
0.13 |
0.03% |
-- |
-- |
-- |
-- |
|
Generator 5 and 6 |
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|
Point A |
-- |
-- |
2.70 |
0.54% |
-- |
-- |
|
Point B |
-- |
-- |
2.21 |
0.44% |
-- |
-- |
|
Generator 4 |
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|
Point A |
302.2 |
60.44% |
-- |
-- |
247.90 |
49.58% |
|
Point B |
-- |
-- |
-- |
-- |
0.17 |
0.04% |
|
Point C |
-- |
-- |
-- |
-- |
45.29 |
9.06% |
|
Point E |
-- |
-- |
-- |
-- |
1185 |
237% |
|
Point F |
-- |
-- |
651 |
130% |
222.3 |
44.46% |
|
Point G |
-- |
-- |
-- |
-- |
0.45 |
0.45% |
|
Point I |
-- |
-- |
-- |
-- |
273 |
54.60% |
|
Point J |
-- |
-- |
-- |
-- |
175.8 |
35.16% |
|
Generator 6 |
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|
Point A |
183.6 |
36.72% |
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|
Point B |
158 |
31.60% |
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|
Point C |
3.18 |
3.18% |
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|
Point D |
48.78 |
9,76% |
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|
Point E |
157.90 |
31.58% |
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|
Point F |
1571 |
314.2-% |
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|
Point G |
766 |
153% |
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Table 2: Maximum Magnetic Field measurements inside Moni Power Station