Influence of measurement uncertainty of overhead power line conductor heights on electric and magnetic field calculation results

Abstract

In this paper, it is analyzed how the measurement uncertainty of the overhead power line conductor heights influences the calculation results of electric field strength and magnetic flux density in the vicinity of the line. It is assumed that the conductor heights have been determined by measurements, by using a laser telemeter which has a certain measurement error. The laser telemeter measures the distance to the target object and inclination, and based on these two quantities and the manually entered data concerning the height on which the telemeter is placed it calculates the height of the target object, as well as the horizontal distance to it. Each of these measured quantities (distance and inclination) is measured with a defined error. The error of the height measurement has to be calculated based on the two defined errors. The procedure for calculating these errors is explained in detail in the paper, and the errors referring to typical heights of the overhead power line conductors are determined. If the calculations of electric field strength and magnetic flux density are made for the conductor heights with the established deviation in relation to the real heights, this will reflect on the calculated field results. The influence of this factor on the results of the electric field strength and magnetic flux density calculations is thoroughly analyzed.