MODELING OF A SINGLE-PHASE EARTH FAULT IN DETERMINING THE LOCATION OF DAMAGE USING LINEAR ALGEBRA THEORY

Abstract

The article is devoted to the analysis of emergency modes in a network with an isolated neutral of 6(10)-35 kV.. The purpose of the work is to develop a mathematical model of an electrical network with a voltage of 6(10)-35 kV when calculating a single-phase earth fault to determine the location of damage using linear algebra theory. Tasks: to analyze the emergency mode in a network with an isolated neutral; to develop a methodology for calculating an emergency event taking into account the parameters of the transient process to determine the location of accidents in the network. The result of the proposed solutions is a rational determination of the single-phase earth fault current parameter, taking into account the values of the longitudinal and transverse components of the network replacement circuit. The study of the replacement circuit and the calculation of the circuit parameters using the decomposition theory of the matrix determinant show good dynamics of accounting for all parameters of the electrical network in the event of an emergency ground fault. According to the calculated values of the frequencies under consideration, the intrinsic resistance «Z» of each of the circuits of the resulting substitution circuit is determined. After determining the intrinsic resistance of the earth fault circuit taking into account the transient resistance, the dependence Z = f(ω) is calculated to determine the distance to the location of the defect in power transmission lines in remote devices for fixing emergency events installed in distribution networks of 6(10)-35 kV.