EAC 132 - 11 kV Omonoia Substation

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EAC 132 - 11 kV Omonoia Substation
The measured substation is located in Omonoia area in Limassol. The measurements were performed on the 24th of
October 2008 at 11:00 am. The EAC 132-11 kV Substation in Omonoia 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
where the incoming and outgoing switchgear breakers are installed and a working area with the control rooms of the
substation. In direct proximity to the substation are a number of houses and shops.
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EAC 132 - 11 kV Omonoia 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.
Reference levels for Occupational exposure ICNIRP
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EAC 132 - 11 kV Omonoia Substation
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 power as measured from the two operating transformers, at the time when the measurements were performed is
listed below:
Time
Transformer 1 Power [MW]
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EAC 132 - 11 kV Omonoia Substation
Transformer 2 Power [MW]
11:40 am
4.5
7.4
Table 2: Maximum Power consumption recorded during EMF measurements for substation Omonoia
The power transformers have an operating capacity of 30 MW and a full power capacity of 40 MW with the fans
operating.
The highest magnetic field inside the substation was observed in the Transformer 2 room (in front of the 11 kV cable
side), with a value 461.7 µT and a percentage of 92.34% as compared to the ICNIRP Occupational standard.
Accordingly the Magnetic Field measurements taken both inside and outside the power station are summarized in the
following tables.
Substation : Inside Maximum Field Measurements
Distance from Side (m)
Maximum Magnetic Field (µT) at Z Height (m)
Percentage of ICNIRP General Public Standard (%)
0.3m
ICNIRP %
1m
ICNIRP %
1.75 m
ICNIRP %
Control room 11 kV
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EAC 132 - 11 kV Omonoia Substation
Incomer 2
-- -- -- -- 49.60
9.92%
Power factor correction room
Room
-- -- 0.19
0.04%
-- -- Transformer room 1
Transformer 1 - 11kv 400.6
80.12%
-----
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EAC 132 - 11 kV Omonoia Substation
Transformer room 2
Transformer 2 - 11kv 461.7
92.34%
----Incoming - Outgoing cables
11 - 132 kV cables
67.0 13.40%
----Control room 132 kV
Point A
19.28
3.86%
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EAC 132 - 11 kV Omonoia Substation
Table 3: Maximum Magnetic Field measurements inside power station
Accordingly the highest magnetic field value outside the substation was observed at the right border side (at a height
of 0.3m), with value 2.66 µT and a percentage of 2.66 % as compared to the ICNIRP General Public standard.
Substation : Outside Maximum Field Measurements
Distance from Side (m)
Maximum Magnetic Field (µT) at Z Height (m)
Percentage of ICNIRP General Public Standard (%)
0.3m
ICNIRP %
1m
ICNIRP %
1.75 m
ICNIRP %
Outside substation
Left outside wall
0.95
0.95% --- --- Σελίδα 7 / 9
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EAC 132 - 11 kV Omonoia Substation
Front outside wall
0.51
0.51%
- - - -Right outside wall
4.68
4.68%
- - - -Back outside wall
0.41
0.41%
- - - -Other outside wall
2.66
2.66%
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EAC 132 - 11 kV Omonoia Substation
--- - -Table 4: Maximum Magnetic Field measurements outside power station
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