Residence 19a Olympou str. in direct proximity to Substation Yiatros

 

The measurements were performed on the 22nd April 2015 at 10:30 a.m during clear weather conditions. The EMF measurements were performed for the residence 19a Olympou str. and substation “Yiatros” in Nicosia. The following figures provide pictures of the area where EMF measuremets were recorded.

Residence under investigation - Kitchen Substation under investigation


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

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 substation is rated at a nominal power of 500 KVA. At the time when the measurements were performed the substation load was recorded as:


Red Phase

Yellow Phase

Blue Phase

45A

45A

50A

Table 2: Measured load current


From the resultant load of all three phases as shown above we note that the load is only 6.44 % of the nominal load (500 KVA Transformer).It must therefore be noted that during the summer or in periods of peak load this will directly affect and produce an increase to the electric and magnetic fields.

The highest magnetic field measurement was observed 1 m away from the front side of the substation at height 0.3 m (1m away from the starting point). The measured value at this point was 0.253 μT and a percentage of 0.253 % as compared to the ICNIRP General Public standard.

A detailed description of the maximum measured magnetic fields in the area under investigation, outside the substation, is shown in the following table. 

Magnetic 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 %

1.75m

ICNIRP %

Substation right side - Mesh - Maximum values per line

M.L. 0m away from Substation front side

0.180

0.180%

0.126

0.126%

0.057

0.057%

M.L. 1m away from Substation front side

0.253

0.253%

0.109

0.109%

0.049

0.049%

M.L. 2m away from Substation front side

0.190

0.190%

0.083

0.083%

0.046

0.046%

Table 3: Maximum Magnetic Field Measurements.

A detailed description of the maximum measured magnetic fields in the area under investigation, inside the residence, is shown in the following table.

Magnetic 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 %

1.75m

ICNIRP %

Residence - First Floor

Measurement Point A

--

--

0.110

0.110%

--

--

Residence - Fifth Floor

Measurement Point B

--

--

0.120

0.120%

--

--

Table 4: Maximum Magnetic Field Measurements.

The highest electric field measurement was observed inside the sitting room at the first floor of the apartment. The measured value at this point was 9.98 V/m and a percentage of 0.2 % as compared to ICNIRP General Public standard. A detailed description of the maximum measured electric fields in the area under investigation, inside the residence and outside substation, is shown in the following table.

Electric Field Measurements

Measurement Point

Maximum Electric Field (V/m) at Z Height /m - Percentage of ICNIRP General Public Standard /%

0.3m

ICNIRP %

1m

ICNIRP %

1.75m

ICNIRP %

Substation front side - Maximum values per line

Measurement Point A

--

--

0.829

0.017%

--

--

Residence - First Floor

Measurement Point B

--

--

8.980

0.180%

--

--

 Residence - Fifth Floor
 Measurement Point C  --  --  0.989  0.020%  --  --

Table 5: Electric Field Measurements.