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Virtualni instrument za merjenje specifične električne prevodnosti nadzemnih vodnikov
Gergič, Bojan
This paper describes virtual instrument for electrical conductivity measurement of aluminium conductors steel reinforced (ACSR) for overhead lines. The structure of virtual instrument and the ...expression of uncertainty of measurement are given. Four samples of Al/Je 490/65 conductors (two new andtwo used for over 30 years) with together 216 aluminium wires and 4 steel wires were measured. It was find out that all four samples corresponds to the requirements of the standard, where electrical conductivity of ã20=35.58 S m/mm2 for aluminium wires is required. The expanded uncertainty obtained with coverage factor k=2 was 7.0 10-3. From values of individual uncertainty appears that to combined standard uncertainty mostly contribute measurement ofresistance and that Type A evaluation of standard uncertainty is negligible.
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