ANALYSIS AND DATA PROCESSING SYSTEMS

Electric energy currently transmitted via high-voltage power transmission lines is characterized by reduced quality. This fact complicates a quite difficult task of determining voltage at any point of the investigated overhead transmission line. In papers published by V.A. Veniko, V.I. Idelchik and A.A. Almendeev, a transmission lines is considered as a line with lumped parameters, mutual influence of wires, but the ground wire is not taken into account. Moreover, single-wire transmission line equivalent circuits form the basis for analyzing electric power transmission. However, E.M. Shishkov and A.S. Vedernikovin their papers mention that not taking into account the ground wire, using single-wire equivalent circuits, neglecting the asymmetry of the primary parameters of the overhead line introduces a significant error in the results of calculating electric modes, especially with reduced quality of electric energy. The purpose of the study is to create a technique for predicting voltages in a three-phase overhead line with a ground wire under conditions of reduced quality of electric energy. This technique is based on the wave theory of electrical energy distribution. The investigated section of the transmission line is considered as a line with distributed parameters and phase-to-phase distribution equations are formed on the basis of a full-phase equivalent circuit that takes into account all electromagnetic couplings including electromagnetic couplings between linear wires and the ground wire. The proposed technique involves determining the values of the integration constants taking into account the interconnection of voltages and currents of neighboring wires. Graphical interpretations of voltage distribution along a homogeneous section of the three-phase three-wire transmission line are constructed taking into account the ground wire at the frequencies of the main and thirteenth harmonic components. They allow you to visually perform voltage prediction on the sections of the transmission line of different lengths, determine the length of the resulting wave of the electric field, and generate transfer functions for phase voltages.

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