Site Measurements and Calculations of Electrostatic and Electromagnetic Fields of a 220-KV Overhead Transmission Line.(Dept.E)

Abstract

Field measurements, whenever possible, still constitute the most direct method of obtaining quantitative as well as qualitative results concerning the values of both electrostatic and electromagnetic fields, provided adequate arrangements are used. It is also the usual practice to compare the results obtained by measurements with those obtained by calculations, The paper presents the results of electrostatic and electromagnetic field measurements produced under a 220-kV overhead transmission line. Two different sites along the line are selected for field tests, Simp lified measuring technique is used and the measurements are p erformed at different heights ranging from 1 m to 3 m above ground surface, with transverse distances up to 25 m around the centre of the transmission line. Using image theory and the quasi-static app roximation, corresponding results are calculated and compared with the test results. The comparison shows that the results obtained by field tests are in good agreement with those obtained by calculations. This concludes the adequacy of the simp lified measuring technique used in this investigation.