2021 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM) | 2021
Considering Nonuniformity of the Soils Electric Parameters when Determining Mutual Electromagnetic Influences of Adjacent Power Lines
Abstract
Power lines (PL) of different voltage classes can mutually approach on separate route sections; at the same time, on the disconnected PL due to the electromagnetic effects of adjacent lines, voltages that are dangerous for the service personnel can be induced. To protect people from the effects of induced voltages, special actions are taken. In the context of electric power industry digitalization, the choice of such actions should be based on computer technologies. The highest voltages are observed in unsymmetrical modes when currents flow in the earth in the event of phases interruption. Therefore, the task of determining the levels of induced voltages for such modes is urgent. These voltages levels can be influenced by the electrical characteristics of soils. However, the quantitative assessment of this effect has not been sufficiently studied. To solve the problem of determining the electromagnetic effects of adjacent PL with analysis of the influence of soils resistance, methods of nonsymmetrical modes modeling of electric power systems were used, based on the use of their elements multiphase representation. The simulation was implemented using the Fazonord software application. The simulation results indicated that in the phase interruption modes, increased levels of induced voltages are observed, which significantly exceed the permissible value of 25 V. Soil conductivity $y$ has a noticeable effect on the induced voltages magnitudes. If the electrical characteristics of soils on the approach path are different, the path should be divided into separate sections with an individual setting of $y$ parameter.The presented methodology and the developed computer models make it possible to take into account the nonuniformity of soils on the approach paths of PL and the adjacent line and can be used in practice when planning electrical safety measures. The technique can be easily extended to situations when the analyzed multi-wire system is a part of a complex electric power system. In addition, the approach of the PL and the adjacent line can be carried out along a complex trajectory, including parallel and skewed segments.