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QUANTIFICATION OF THE OPERATOR PROXIMITY EFFECT ON THE MEASUREMENT RESULTS OF ELECTRIC FIELD STRENGTH IN THE VICINITY OF OVERHEAD POWER LINES

In this paper, the operator proximity effect on the measurement results of the electric field strength in the vicinity of overhead power lines is analyzed. The operator proximity effect depends on the distance between the operator and the probe for measuring the electric field strength, as well as on the height at which the probe is placed. The paper presents the results of the electric field strength measurements performed in the vicinity of a 220 kV overhead power line in order to quantify the influence of the proximity of the operator. The measurements were carried out by using a cube-shaped isotropic probe. During the measurements, the probe was placed on a wooden tripod and connected to the electromagnetic field analyzer by an optical cable. The measurements were performed at the heights of 1 m, 1.5 m and 1.7 m. The distance between the operator and the measuring probe during these measurements was gradually increased from 1 m to 10 m. The obtained results are analyzed in detail in this paper. These results can be used for evaluating the electric field strength measurement uncertainty. The significance of these results also lies in demonstrating the manner in which the operator’s influence on the measured field can be reduced to an acceptable level.