The measured substation is located in Agios Athanasios area in Limassol. The measurements were performed on the 27th of November 2008 at 11:00 am. The EAC 132-11 kV Substation in Agios Athanasios comprises of a main building which includes a basement where the incoming and outgoing cables are mounted, three rooms where the transformers are located, a room at the first floor where the incoming and outgoing switchgear breakers are installed and a working area with the control rooms of the substation.
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) |
|
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 power as measured from the two operating transformers (11 kV side and recorded from the incomer cables), at the time when the measurements were performed is listed below:
|
Time |
Incomer 1 [A] |
Incomer 3 [A] |
|
11:10 am |
750 |
330 |
| 12:10 am | 750 | 340 |
Table 2: Power measured in incomers
The power transformers have an operating capacity of 30 MW and a full power capacity of 40 MW with the fans operating.
Accordingly the Electric Field measurements taken both inside and outside the power station are summarized in the following tables.
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Measurements inside Vasilikos Power Station- Devices |
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|
Inside the Workshop |
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|
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
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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 /% |
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|
0.3m |
ICNIRP % |
1 m |
ICNIRP % |
1.75 m |
ICNIRP % |
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|
Generator Transformer 1 |
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|
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 |
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|
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.
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Vasilikos Power Station: Electric Fields inside Power Station |
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Measurement Point |
Maximum Electric Field (kV/m) at Z Height /m - Percentage of ICNIRP Occupational Standard /% |
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|
0.3m |
ICNIRP % |
1 m |
ICNIRP % |
1.75 m |
ICNIRP % |
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|
132kV GIS Area |
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|
Measurement Point J |
------ |
------ |
------ |
------ |
0.0008 |
0.0087% |
Table 5: Electric Field measurements inside Vasilikos Power Station
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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 /% |
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|
0.3m |
ICNIRP % |
1 m |
ICNIRP % |
1.75 m |
ICNIRP % |
|
|
Generator Transformer 1 |
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|
Measurement Point F |
------ |
------ |
------ |
------ |
0.0051 |
0.0514% |
|
Unit Transformer |
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|
Measurement Point E |
------ |
------ |
------ |
------ |
0.0008 |
0.0086% |
|
Measurement Point F |
------ |
------ |
------ |
------ |
0.0007 |
0.0075% |
Table 6: Electric Field measurements outside Vasilikos Power Station