Measurements on the Ground and Mathematical Modeling of Voltages Induced by High Voltage Overhead Power Lines Working on Parallel and Narrow Routes

In the case of parallel and narrow overhead high voltage electric power lines, where one of the circuits is disconnected, knowing the electric and magnetic coupling mechanisms and the values of voltages induced by couplings at low frequency is of a particular importance for finding out methods and means for the warning and protection of the working staff who are performing maintenance on such lines. The paper presents the measurements that the author has done in the South-Western area of Romania for the 220 kV double circuit aerial power lines having a passive circuit and an active one. It also describes a mathematical simulation for determining the voltages induced by the active circuit into the disconnected circuit of the power lines, accompanied by a calculating programme of these voltages. The results of the measurements are compared with those obtained through calculations in order to validate the mathematical model, which thus becomes a useful tool for professionals in electrical power engineering