Substation - Substation Nestor, Company DataTech IT, Sotira Street

 

The measurements were performed on the 3rd December 2014 at 16:00 a.m during clear weather conditions. The EMF measurements were performed for the company "DataTech IT", Sotira Street and substation Nestor in Strovolos, Nicosia.

Company under investigation - Show room 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 630 KVA. At the time when the measurements were performed the substation load was recorded as:


Red Phase

Yellow Phase

Blue Phase

280A

230A

280A

Table 2: Measured load current


From the resultant load of all three phases as shown above we note that the load is only 28.84 % of the nominal load (630 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 at the rfront side of the substation, 0 m away from the substation starting point and at a height of 1 m. The measured value at this point was 7.849µT and a persentage of 7.849% as compared to the INCIRP General Public stantard.

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 front side - Mesh - Maximum values per line

M.L. 0m away from
Substation front side

4.222

4.222%

7.849

0.249%

5.002

5.002%

M.L. 1m away from
Substation front side

1.152

1.152%

1.538

0.190%

0.909

0.909%

M.L. 2m away from
Substation front side

0.699

0.699%

0.825

0.095%

0.649

0.649%

 M.L. 2m away from Substation front side  0.366 0.366%   0.439  0.439%  0.386 0.386% 

Substation top side side - Mesh - Maximum values per line

M.L. 0m away from Substation top side

1.462

1.462%

0.685

0.685%

0.433

0.433%

M.L. 1m away from
Substation top side

1.355

1.355%

0.632

0.632%

0.421

0.421%

M.L. 2m away from Substation top side

0.253

0.253%

1.966

1.866%

2.081

2.081%

Table 3: Maximum Magnetic Field Measurements.

A detailed description of the maximum measured magnetic fields in the area under investigation, inside the company DataTech IT, 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 %

Company - First Floor

Measurement Point A

--

--

0.344

0.344%

--

--

Company - Second Floor

Measurement Point B

--

--

3.829

3.829%

--

--

Company - Third Floor

Measurement Point C

--

--

10.800

10.800%

--

--

Table 4: Maximum Magnetic Field Measurements.

The highest electric field measurement was observed at the third floor of the company, at measurement point E and at a height of 1 m. The measured value at this point was 57.68 V/m and a percentage of 1.154 % as compared to ICNIRP General Public standard. A detailed description of the maximum measured electric fields in the area under investigation, inside the residence, 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 right side - maximum values per line

Measurement Point A

--

--

1.042

0.021%

--

--

Substation back side - maximum values per line

Measurement Point B

--

--

14.570

0.291%

--

--

Residence - Kitchen

Measurement Point C

--

--

4.634

0.093%

--

--

 Residence - Sitting room
Measurement Point D  --  --  3.310  0.066%  --  --
   Residence - Bedroom 1
 Measurement Point E   --   --   57.680   1.154%   --   --

Table 5: Electric Field Measurements.