METHOD FOR LOCATING A FAULT IN A POWER GRID ON THE BASIS OF DISTRIBUTED VOLTAGE MEASUREMENTS

摘要

The invention relates to a method for locating a fault in a power grid powered by a source, by triangulating voltage measurements at at least three different locations in the grid, in which at least one of said locations is located upstream of the fault in relation to the source. According to the invention, voltage phasors that correspond to the voltages measured during the fault are time-synchronised. The grid conductors involved in the fault are determined according to the characteristics of the voltage phasors and a fault current generating a voltage drop at one of the measurement locations in relation to an initial voltage value is evaluated. The position of the fault is evaluated at a network point at which the ratio between the difference in the voltages measured at two of the measurement locations and the impedance between one of the two measurement locations and the aforemention point, depending on the conductors involved, is equal to the fault current.