On the 6th of February 2008 at 9:00 am electric and magnetic field measurements were performed for EAC Vasilikos Power 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.
|
Reference levels for Occupational exposure ICNIRP |
|||
|
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 |
|||
|
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, 3 and 4 respectively. A comparison is also made with the ICNIRP recommendations.
|
Vasilikos Power Station: Magnetic Fields Inside Power Station |
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|
Measurement Point |
Maximum Magnetic Field / µT at Z Height /m - Percentage of ICNIRP Occupational Standard /% |
|||||
|
0.3m |
ICNIRP % |
1 m |
ICNIRP % |
1.75 m |
ICNIRP % |
|
|
Inside the Central Control Room |
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|
Measurement Point A |
0.39 |
0.07% |
---- |
---- |
---- |
---- |
|
Measurement Point B |
---- |
---- |
0.34 |
0.07% |
---- |
---- |
|
Measurement Point C |
0.66 |
0.13% |
---- |
---- |
---- |
---- |
|
Power Generator 1 |
||||||
|
Measurement Point A |
10.50 |
2.10% |
9.16 |
1.83% |
8.28 |
1.65% |
|
Measurement Point B |
157.10 |
31.42% |
169.00 |
33.80% |
148.10 |
29.62% |
|
Measurement Point C |
56.12 |
11.22% |
101.30 |
20.26% |
104.90 |
20.98% |
|
Measurement Point D |
33.85 |
6.77% |
39.19 |
7.83% |
35.77 |
7.15% |
|
Measurement Point E |
43.30 |
8.66% |
113.80 |
22.76% |
93.50 |
18.70% |
|
Measurement Point F |
------ |
------ |
108.70 |
21.74% |
------ |
------ |
|
Measurement Point G |
62.68 |
12.53% |
44.74 |
8.94% |
63.94 |
12.78% |
|
Measurement Point H |
62.70 |
12.54% |
132.00 |
26.40% |
99.60 |
19.92% |
|
Excitation Transformer Area |
||||||
|
Measurement Point A |
1.75 |
0.35% |
1.773 |
0.35% |
1.79 |
0.35% |
|
Measurement Point B |
16.10 |
3.22% |
14.23 |
2.84% |
12.44 |
2.48% |
|
Measurement Point C |
------ |
------ |
23.82 |
4.76% |
------ |
------ |
|
Measurement Point D |
------ |
------ |
7.07 |
1.41% |
------ |
------ |
|
Measurement Point E |
292.00 |
58.40% |
183.8 |
36.76% |
192.80 |
38.56% |
|
Measurement Point F |
31.60 |
6.32% |
22.3 |
4.46% |
19.63 |
3.92% |
|
Measurement Point G |
38.44 |
7.68% |
22.72 |
4.54% |
26.21 |
5.24% |
|
132kV GIS Area |
||||||
|
Measurement Point A |
------ |
------ |
18.83 |
3.76% |
------ |
------ |
|
Measurement Point B |
30.87 |
6.17% |
------ |
------ |
------ |
------ |
|
Measurement Point C |
------ |
------ |
948.60 |
189.72% |
------ |
------ |
|
Measurement Point D |
17.02 |
3.40% |
------ |
------ |
------ |
------ |
|
Measurement Point E |
923.90 |
184.78% |
------ |
------ |
------ |
------ |
|
Measurement Point F |
75.70 |
15.14% |
------ |
------ |
------ |
------ |
|
Measurement Point G |
5.10 |
1.02% |
------ |
------ |
------ |
------ |
|
Measurement Point H |
------ |
------ |
134.60 |
26.92% |
------ |
------ |
|
Measurement Point I |
26.28 |
5.25% |
------ |
------ |
------ |
------ |
|
Inside the GIS Control Room |
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|
Measurement Point A |
---- |
---- |
2.79 |
0.56% |
---- |
---- |
|
Measurement Point B |
---- |
---- |
2.20 |
0.44% |
---- |
---- |
|
Measurement Point C |
1.30 |
0.26% |
---- |
---- |
---- |
---- |
|
Moni 2 - 81 AEB 18 and 16AB25 |
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|
Measurement Point A |
---- |
---- |
6.15 |
1.23% |
---- |
---- |
|
Measurement Point B |
---- |
---- |
34.66 |
6.93% |
---- |
---- |
|
Measurement Point C |
4.27 |
0.85% |
3.68 |
0.73% |
---- |
---- |
|
Measurement Point D |
---- |
---- |
3.37 |
0.67% |
---- |
---- |
|
Measurement Point E |
---- |
---- |
---- |
---- |
9.05 |
1.81% |
|
Measurement Point F |
---- |
---- |
---- |
---- |
0.76 |
0.15% |
|
Electricians Room and Kitchen |
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|
Measurement Point A |
4.98 |
0.99% |
6.10 |
1.22% |
7.33 |
1.46% |
|
Measurement Point B |
---- |
---- |
3.28 |
0.65% |
---- |
---- |
|
Measurement Point C |
---- |
---- |
1.48 |
0.29% |
---- |
---- |
|
Measurement Point D |
---- |
---- |
---- |
---- |
2.82 |
0.56% |
|
Measurement Point E |
---- |
---- |
1.39 |
0.27% |
---- |
---- |
|
Measurement Point F |
---- |
---- |
2.23 |
0.44% |
---- |
---- |
Table 2: Maximum Magnetic Field measurements inside power station
|
Measurements inside Vasilikos Power Station- Devices |
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|
Inside the Workshop |
||
|
Device |
Magnetic Field/µT-Percentage of ICNIRP Occupational Standard /% |
|
|
Measurements on Device Parts |
ICNIRP % |
|
|
Plasma Cutter |
1.65 |
0.33% |
|
KEMPPI TIG 410 |
2.54 |
0.50% |
|
TG 2500 |
526.70 |
105.34% |
Table 3: Measurements on Devices inside the Vasilikos Power Station and ICNIRP Occupational Standard
|
Vasilikos Power Station: Magnetic Fields Outside Power Station |
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|
Measurement Point |
Maximum Magnetic Field / µT at Z Height /m - Percentage of ICNIRP Occupational Standard /% |
|||||
|
0.3m |
ICNIRP % |
1 m |
ICNIRP % |
1.75 m |
ICNIRP % |
|
|
Generator Transformer 1 |
||||||
|
Measurement Point A |
275.70 |
55.14% |
339.40 |
67.88% |
280.50 |
56.10% |
|
Measurement Point B |
24.27 |
4.85% |
13.53 |
2.70% |
14.32 |
2.86% |
|
Measurement Point C |
---- |
---- |
8.85 |
1.77% |
---- |
---- |
|
Measurement Point D |
22.15 |
4.43% |
28.80 |
5.76% |
26.29 |
5.25% |
|
Measurement Point E |
10.62 |
2.12% |
10.97 |
2.19% |
10.00 |
2.00% |
|
Unit Transformer |
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|
Measurement Point A |
8.77 |
1.75% |
5.02 |
1.00% |
6.97 |
1.39% |
|
Measurement Point B |
301.00 |
60.20% |
312.00 |
62.40% |
213.40 |
42.68% |
|
Measurement Point C |
50.66 |
10.13% |
16.24 |
3.24% |
12.11 |
2.42% |
|
Measurement Point D |
3.42 |
0.68% |
3.21 |
0.64% |
3.00 |
0.60% |
|
Parking Area |
||||||
|
Measurement Point A |
2.66 |
0.53% |
---- |
---- |
---- |
---- |
|
Measurement Point B |
1.73 |
0.34% |
1.63 |
0.32% |
1.50 |
0.30% |
Table 4: Maximum Magnetic Field measurements outside power station
Accordingly the Electric Field measurements taken both inside and outside the power station are summarized in the following tables.
|
Vasilikos Power Station: Electric Fields inside Power Station |
||||||
|
Measurement Point |
Maximum Electric Field (kV/m) at Z Height /m - Percentage of ICNIRP Occupational Standard /% |
|||||
|
0.3m |
ICNIRP % |
1 m |
ICNIRP % |
1.75 m |
ICNIRP % |
|
|
132kV GIS Area |
||||||
|
Measurement Point J |
------ |
------ |
------ |
------ |
0.0008 |
0.0087% |
Table 5: Electric Field measurements inside Vasilikos Power Station
|
Vasilikos Power Station: Electric Fields outside Power Station |
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|
Measurement Point |
Maximum Electric Field (kV/m) at Z Height /m - Percentage of ICNIRP Occupational Standard /% |
|||||
|
0.3m |
ICNIRP % |
1 m |
ICNIRP % |
1.75 m |
ICNIRP % |
|
|
Generator Transformer 1 |
||||||
|
Measurement Point F |
------ |
------ |
------ |
------ |
0.0051 |
0.0514% |
|
Unit Transformer |
||||||
|
Measurement Point E |
------ |
------ |
------ |
------ |
0.0008 |
0.0086% |
|
Measurement Point F |
------ |
------ |
------ |
------ |
0.0007 |
0.0075% |
Table 6: Electric Field measurements outside Vasilikos Power Station
At the time when the measurements were performed the load of the unit transformer, which is rated at a nominal power of 14.5 MVA, was recorded as 6.6 kV and 601 A. From the resultant load we note that the utilization is only 48% of the nominal load (14.5 MVA Transformer).
Furthermore the Generator transformer which is rated at a nominal power of 130 MW had a load at the time when the measurements were performed of 120 MW. From the resultant load we note that the load is 92% of the nominal load for this transformer.